From ecbaefd8fc1ab04c92aaac65bb0b81f2f4dbd99f Mon Sep 17 00:00:00 2001
From: kijai <40791699+kijai@users.noreply.github.com>
Date: Tue, 16 Jun 2026 20:47:15 +0300
Subject: [PATCH] Big cleanup

---
 comfy/ldm/sam3d_body/mhr/mhr_head.py          |  82 ++---
 comfy/ldm/sam3d_body/mhr/mhr_rig.py           |  22 +-
 comfy/ldm/sam3d_body/mhr/mhr_utils.py         | 173 +---------
 comfy/ldm/sam3d_body/model/camera_modules.py  |  19 +-
 comfy/ldm/sam3d_body/model/model.py           |  80 ++---
 comfy/ldm/sam3d_body/model/prompt.py          |  52 +--
 comfy/ldm/sam3d_body/utils.py                 |   2 -
 comfy_extras/sam3d_body/export/bvh.py         |  46 +--
 comfy_extras/sam3d_body/export/capsules.py    |  70 ++--
 .../sam3d_body/export/glb_openpose.py         | 312 ++++++------------
 comfy_extras/sam3d_body/export/glb_shared.py  | 251 ++++++--------
 .../sam3d_body/export/glb_skeletal.py         | 122 +++----
 comfy_extras/sam3d_body/utils.py              |  22 +-
 13 files changed, 376 insertions(+), 877 deletions(-)

diff --git a/comfy/ldm/sam3d_body/mhr/mhr_head.py b/comfy/ldm/sam3d_body/mhr/mhr_head.py
index e30e48cb3..d226180a3 100644
--- a/comfy/ldm/sam3d_body/mhr/mhr_head.py
+++ b/comfy/ldm/sam3d_body/mhr/mhr_head.py
@@ -4,25 +4,15 @@ import torch
 import torch.nn as nn
 
 from ..utils import euler_to_rotmat, rot6d_to_rotmat, rotmat_to_euler, unitquat_to_rotmat
-from .mhr_utils import compact_cont_to_model_params_body, compact_cont_to_model_params_hand, compact_model_params_to_cont_body, mhr_param_hand_mask
+from .mhr_utils import compact_cont_to_model_params_body, compact_cont_to_model_params_hand, mhr_param_hand_mask
 
 from ..model.transformer import MLP
 
 
 class MHRHead(nn.Module):
 
-    def __init__(
-        self,
-        input_dim: int,
-        mhr_rig,
-        mlp_depth: int = 1,
-        extra_joint_regressor: str = "",
-        mlp_channel_div_factor: int = 8,
-        enable_hand_model=False,
-        device=None,
-        dtype=None,
-        operations=None,
-    ):
+    def __init__(self, input_dim: int, mhr_rig, mlp_depth: int = 1, mlp_channel_div_factor: int = 8, enable_hand_model=False,
+        device=None, dtype=None, operations=None):
         super().__init__()
         # Store the shared MHRRig as a non-registered Python attribute
         object.__setattr__(self, "mhr", mhr_rig)
@@ -48,9 +38,7 @@ class MHRHead(nn.Module):
             hidden_dim=input_dim // mlp_channel_div_factor,
             output_dim=self.npose,
             num_layers=mlp_depth,
-            device=device,
-            dtype=dtype,
-            operations=operations,
+            device=device, dtype=dtype, operations=operations,
         )
 
         # MHR Parameters
@@ -75,28 +63,25 @@ class MHRHead(nn.Module):
         self.local_to_world_wrist = _p(3, 3)
         self.nonhand_param_idxs = _p(145, dtype=torch.int64)
         # Hand-painted per-vertex face region RGB (rainbow_face_semantic shader).
-        # Optional — loaded from the .safetensors if present, otherwise the
-        # render path falls back to a coarse geometric approximation.
-        self.register_buffer(
-            "face_region_rgb", torch.zeros(18439, 3, dtype=torch.float32),
-        )
+        self.register_buffer("face_region_rgb", torch.zeros(18439, 3, dtype=torch.float32))
 
-    def canonical_vertices(self, device=None):
+    def canonical_vertices(self):
         """Return the T-pose vertices for the mean shape (scaled to meters).
 
         Runs MHR with zero pose / shape / scale / expression so the returned
         mesh is the canonical rest pose — fixed per-model
         """
-        dev = device or self.scale_mean.device
-        dt = self.scale_mean.dtype
+        device = self.scale_mean.device
+        dtype = self.scale_mean.dtype
         B = 1
-        global_trans = torch.zeros(B, 3, device=dev, dtype=dt)
-        global_rot   = torch.zeros(B, 3, device=dev, dtype=dt)
-        body_pose    = torch.zeros(B, 130, device=dev, dtype=dt)
-        hand_pose    = torch.zeros(B, self.num_hand_comps * 2, device=dev, dtype=dt)
-        scale        = torch.zeros(B, self.num_scale_comps, device=dev, dtype=dt)
-        shape        = torch.zeros(B, self.num_shape_comps, device=dev, dtype=dt)
-        expr         = torch.zeros(B, self.num_face_comps, device=dev, dtype=dt)
+        global_trans = torch.zeros(B, 3, device=device, dtype=dtype)
+        global_rot   = torch.zeros(B, 3, device=device, dtype=dtype)
+        body_pose    = torch.zeros(B, 130, device=device, dtype=dtype)
+        hand_pose    = torch.zeros(B, self.num_hand_comps * 2, device=device, dtype=dtype)
+        scale        = torch.zeros(B, self.num_scale_comps, device=device, dtype=dtype)
+        shape        = torch.zeros(B, self.num_shape_comps, device=device, dtype=dtype)
+        expr         = torch.zeros(B, self.num_face_comps, device=device, dtype=dtype)
+
         verts = self.mhr_forward(
             global_trans=global_trans,
             global_rot=global_rot,
@@ -108,20 +93,6 @@ class MHRHead(nn.Module):
         )  # single-tensor shape (1, N_v, 3) in meters
         return verts[0]
 
-    def get_zero_pose_init(self, factor=1.0):
-        # Initialize pose token with zero-initialized learnable params
-        # Note: bias/initial value should be zero-pose in cont, not all-zeros
-        weights = torch.zeros(1, self.npose)
-        weights[:, : 6 + self.body_cont_dim] = torch.cat(
-            [
-                torch.FloatTensor([1, 0, 0, 0, 1, 0]),
-                compact_model_params_to_cont_body(torch.zeros(1, 133)).squeeze()
-                * factor,
-            ],
-            dim=0,
-        )
-        return weights
-
     def replace_hands_in_pose(self, full_pose_params, hand_pose_params):
         assert full_pose_params.shape[1] == 136
 
@@ -159,12 +130,9 @@ class MHRHead(nn.Module):
         shape_params,
         expr_params=None,
         return_keypoints=False,
-        do_pcblend=True,
         return_joint_coords=False,
         return_model_params=False,
         return_joint_rotations=False,
-        scale_offsets=None,
-        vertex_offsets=None,
     ):
         # Align everything to the static buffers
         dt = self.scale_mean.dtype
@@ -206,14 +174,10 @@ class MHRHead(nn.Module):
             shape_params = shape_params[None]
         # Convert scale...
         scales = self.scale_mean[None, :] + scale_params @ self.scale_comps
-        if scale_offsets is not None:
-            scales = scales + scale_offsets
 
         # Now, figure out the pose.
         ## 10 here is because it's more stable to optimize global translation in meters.
-        full_pose_params = torch.cat(
-            [global_trans * 10, global_rot, body_pose_params], dim=1
-        )  # B x 127
+        full_pose_params = torch.cat([global_trans * 10, global_rot, body_pose_params], dim=1)  # B x 127
         ## Put in hands
         if hand_pose_params is not None:
             full_pose_params = self.replace_hands_in_pose(
@@ -268,14 +232,7 @@ class MHRHead(nn.Module):
         else:
             return tuple(to_return)
 
-    def forward(
-        self,
-        x: torch.Tensor,
-        init_estimate: Optional[torch.Tensor] = None,
-        do_pcblend=True,
-        slim_keypoints=False,
-        intermediate: bool = False,
-    ):
+    def forward(self, x: torch.Tensor, init_estimate: Optional[torch.Tensor] = None, intermediate: bool = False):
         """
         Args:
             x: pose token with shape [B, C], usually C=DECODER.DIM
@@ -331,7 +288,6 @@ class MHRHead(nn.Module):
             scale_params=pred_scale,
             shape_params=pred_shape,
             expr_params=pred_face,
-            do_pcblend=do_pcblend,
             return_keypoints=True,
             return_joint_coords=True,
             return_model_params=True,
@@ -356,7 +312,7 @@ class MHRHead(nn.Module):
         # Head-MLP outputs are promoted to fp32 here so the external
         # pose_output["mhr"] contract has a stable dtype regardless of what
         # the head ran at (fp16/bf16 for speed). MHR-derived outputs are
-        # already fp32 from MHR's math layers; the cast on them is a no-op.
+        # already fp32 from MHR's math layers.
         output = {
             "pred_pose_raw": torch.cat([global_rot_6d, pred_pose_cont], dim=1).float(),
             "pred_pose_rotmat": None,
diff --git a/comfy/ldm/sam3d_body/mhr/mhr_rig.py b/comfy/ldm/sam3d_body/mhr/mhr_rig.py
index f5542563f..90202a6fe 100644
--- a/comfy/ldm/sam3d_body/mhr/mhr_rig.py
+++ b/comfy/ldm/sam3d_body/mhr/mhr_rig.py
@@ -1,7 +1,7 @@
 # Adapted from facebookresearch/MHR (Apache 2.0):
 #   https://github.com/facebookresearch/MHR/blob/main/mhr/mhr.py
 # Skinning ops follow facebookincubator/momentum (Apache 2.0) — formulas
-# verbatim from the TorchScript source bundled in the upstream mhr_model.pt
+# verbatim from the upstream mhr_model.pt
 # (pymomentum.{skel_state,quaternion,backend.skel_state_backend}).
 # Original Copyright (c) Meta Platforms, Inc. and affiliates.
 
@@ -52,7 +52,7 @@ def _skel_multiply(s1, s2):
 
     Mirrors pymomentum.skel_state.multiply: both quaternions are renormalized
     before composition. With many FK levels the previously-normalized quats
-    drift in ULPs; the JIT renormalizes defensively, so we do too to stay
+    drift in ULPs; upstream renormalizes defensively, so we do too to stay
     bit-close to its outputs.
     """
     t1, sc1 = s1[..., :3], s1[..., 7:8]
@@ -78,7 +78,7 @@ def _skel_transform_points(skel_state, points):
 
 
 def _global_skel_state_from_local(local, pmi_levels):
-    """FK walk in fp64 (matches the JIT's use_double_precision=True path).
+    """FK walk in fp64 (matches upstream's use_double_precision=True path).
 
     `pmi_levels` is a precomputed list of (source_idx, target_idx) tensor pairs,
     one per BFS level. Avoids per-call torch.split + tolist() sync.
@@ -95,7 +95,7 @@ def _global_skel_state_from_local(local, pmi_levels):
 class MHRRig(nn.Module):
     """Plain-PyTorch reimplementation of Meta's MHR rig.
 
-    All math runs in fp32 (FK upcast to fp64 internally, matching the JIT's
+    All math runs in fp32 (FK upcast to fp64 internally, matching upstream's
     use_double_precision=True backend) regardless of the host model's dtype.
     """
 
@@ -110,13 +110,11 @@ class MHRRig(nn.Module):
     POSE_CORR_HIDDEN = 3000
     POSE_CORR_SPARSE_NNZ = 53136
 
-    def __init__(self, device=None, dtype=None, operations=None):
+    def __init__(self, device=None):
         super().__init__()
-        del dtype, operations
-        f32 = torch.float32
 
         # All buffers are populated by load_state_dict from the `mhr.*` keys
-        def _p(*shape, dtype=f32):
+        def _p(*shape, dtype=torch.float32):
             return nn.Parameter(torch.empty(*shape, dtype=dtype, device=device), requires_grad=False)
         def _b(name, *shape, dtype):
             self.register_buffer(name, torch.empty(*shape, dtype=dtype, device=device))
@@ -147,10 +145,10 @@ class MHRRig(nn.Module):
         self._pmi_levels_cache = None
 
     def forward(self, identity_coeffs, model_parameters, expr_coeffs, apply_correctives: bool = True):
-        f32 = self.base_shape.dtype
-        identity_coeffs = identity_coeffs.to(f32)
-        model_parameters = model_parameters.to(f32)
-        expr_coeffs = expr_coeffs.to(f32)
+        dtype = self.base_shape.dtype
+        identity_coeffs = identity_coeffs.to(dtype)
+        model_parameters = model_parameters.to(dtype)
+        expr_coeffs = expr_coeffs.to(dtype)
         B = identity_coeffs.shape[0]
 
         identity_rest = self.base_shape + torch.einsum("nvd,bn->bvd", self.identity_basis, identity_coeffs)
diff --git a/comfy/ldm/sam3d_body/mhr/mhr_utils.py b/comfy/ldm/sam3d_body/mhr/mhr_utils.py
index 421b5fcd7..543137f79 100644
--- a/comfy/ldm/sam3d_body/mhr/mhr_utils.py
+++ b/comfy/ldm/sam3d_body/mhr/mhr_utils.py
@@ -1,5 +1,5 @@
 # MHR (Meta Human Rig) parameter packing/unpacking. The 6D-rotation helpers
-# (batch6DFromXYZ, batchXYZfrom6D, batch9Dfrom6D) are the continuity
+# (batch6DFromXYZ, batchXYZfrom6D) are the continuity
 # representation from Zhou et al., "On the Continuity of Rotation
 # Representations in Neural Networks" (CVPR 2019, https://arxiv.org/abs/1812.07035),
 # implementations from papagina/RotationContinuity:
@@ -158,18 +158,10 @@ def _hand_masks(device):
     m = _HAND_MASK_CACHE.get(device)
     if m is not None:
         return m
-    mask_cont_threedofs = torch.cat(
-        [torch.ones(2 * k, dtype=torch.bool) * (k == 3) for k in _HAND_DOFS]
-    ).to(device)
-    mask_cont_onedofs = torch.cat(
-        [torch.ones(2 * k, dtype=torch.bool) * (k in (1, 2)) for k in _HAND_DOFS]
-    ).to(device)
-    mask_model_params_threedofs = torch.cat(
-        [torch.ones(k, dtype=torch.bool) * (k == 3) for k in _HAND_DOFS]
-    ).to(device)
-    mask_model_params_onedofs = torch.cat(
-        [torch.ones(k, dtype=torch.bool) * (k in (1, 2)) for k in _HAND_DOFS]
-    ).to(device)
+    mask_cont_threedofs = torch.cat([torch.ones(2 * k, dtype=torch.bool) * (k == 3) for k in _HAND_DOFS]).to(device)
+    mask_cont_onedofs = torch.cat([torch.ones(2 * k, dtype=torch.bool) * (k in (1, 2)) for k in _HAND_DOFS]).to(device)
+    mask_model_params_threedofs = torch.cat([torch.ones(k, dtype=torch.bool) * (k == 3) for k in _HAND_DOFS]).to(device)
+    mask_model_params_onedofs = torch.cat([torch.ones(k, dtype=torch.bool) * (k in (1, 2)) for k in _HAND_DOFS]).to(device)
     m = dict(
         mask_cont_threedofs=mask_cont_threedofs,
         mask_cont_onedofs=mask_cont_onedofs,
@@ -182,7 +174,6 @@ def _hand_masks(device):
 
 def compact_cont_to_model_params_hand(hand_cont):
     # These are ordered by joint, not model params ^^
-    assert hand_cont.shape[-1] == 54
     m = _hand_masks(hand_cont.device)
     mask_cont_threedofs = m["mask_cont_threedofs"]
     mask_cont_onedofs = m["mask_cont_onedofs"]
@@ -209,120 +200,6 @@ def compact_cont_to_model_params_hand(hand_cont):
     return hand_model_params
 
 
-def compact_model_params_to_cont_hand(hand_model_params):
-    # These are ordered by joint, not model params ^^
-    assert hand_model_params.shape[-1] == 27
-    hand_dofs_in_order = torch.tensor([3, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 2, 3, 1, 1])
-    assert sum(hand_dofs_in_order) == 27
-    # Mask of 3DoFs into hand_cont
-    mask_cont_threedofs = torch.cat(
-        [torch.ones(2 * k).bool() * (k in [3]) for k in hand_dofs_in_order]
-    )
-    # Mask of 1DoFs (including 2DoF) into hand_cont
-    mask_cont_onedofs = torch.cat(
-        [torch.ones(2 * k).bool() * (k in [1, 2]) for k in hand_dofs_in_order]
-    )
-    # Mask of 3DoFs into hand_model_params
-    mask_model_params_threedofs = torch.cat(
-        [torch.ones(k).bool() * (k in [3]) for k in hand_dofs_in_order]
-    )
-    # Mask of 1DoFs (including 2DoF) into hand_model_params
-    mask_model_params_onedofs = torch.cat(
-        [torch.ones(k).bool() * (k in [1, 2]) for k in hand_dofs_in_order]
-    )
-
-    # Convert eulers to hand_cont hand_cont
-    ## First for 3DoFs
-    hand_model_params_threedofs = hand_model_params[
-        ..., mask_model_params_threedofs
-    ].unflatten(-1, (-1, 3))
-    hand_cont_threedofs = batch6DFromXYZ(hand_model_params_threedofs).flatten(-2, -1)
-    ## Next for 1DoFs
-    hand_model_params_onedofs = hand_model_params[..., mask_model_params_onedofs]
-    hand_cont_onedofs = torch.stack(
-        [hand_model_params_onedofs.sin(), hand_model_params_onedofs.cos()], dim=-1
-    ).flatten(-2, -1)
-
-    # Finally, assemble into a 27-dim vector, ordered by joint, then XYZ.
-    hand_cont = torch.zeros(*hand_model_params.shape[:-1], 54).to(hand_model_params)
-    hand_cont[..., mask_cont_threedofs] = hand_cont_threedofs
-    hand_cont[..., mask_cont_onedofs] = hand_cont_onedofs
-
-    return hand_cont
-
-
-def batch9Dfrom6D(poses):
-    # Args: poses: ... x 6, where "6" is the combined first and second columns
-    # First, get the rotaiton matrix
-    x_raw = poses[..., :3]
-    y_raw = poses[..., 3:]
-
-    x = F.normalize(x_raw, dim=-1)
-    z = torch.cross(x, y_raw, dim=-1)
-    z = F.normalize(z, dim=-1)
-    y = torch.cross(z, x, dim=-1)
-
-    matrix = torch.stack([x, y, z], dim=-1).flatten(-2, -1)  # ... x 3 x 3 -> x9
-
-    return matrix
-
-
-def batch4Dfrom2D(poses):
-    # Args: poses: ... x 2, where "2" is sincos
-    poses_norm = F.normalize(poses, dim=-1)
-
-    poses_4d = torch.stack(
-        [
-            poses_norm[..., 1],
-            poses_norm[..., 0],
-            -poses_norm[..., 0],
-            poses_norm[..., 1],
-        ],
-        dim=-1,
-    )  # Flattened SO2.
-
-    return poses_4d  # .... x 4
-
-
-def compact_cont_to_rotmat_body(body_pose_cont, inflate_trans=False):
-    # fmt: off
-    all_param_3dof_rot_idxs = torch.LongTensor([(0, 2, 4), (6, 8, 10), (12, 13, 14), (15, 16, 17), (18, 19, 20), (21, 22, 23), (24, 25, 26), (27, 28, 29), (34, 35, 36), (37, 38, 39), (44, 45, 46), (53, 54, 55), (64, 65, 66), (85, 69, 73), (86, 70, 79), (87, 71, 82), (88, 72, 76), (91, 92, 93), (112, 96, 100), (113, 97, 106), (114, 98, 109), (115, 99, 103), (130, 131, 132)])
-    all_param_1dof_rot_idxs = torch.LongTensor([1, 3, 5, 7, 9, 11, 30, 31, 32, 33, 40, 41, 42, 43, 47, 48, 49, 50, 51, 52, 56, 57, 58, 59, 60, 61, 62, 63, 67, 68, 74, 75, 77, 78, 80, 81, 83, 84, 89, 90, 94, 95, 101, 102, 104, 105, 107, 108, 110, 111, 116, 117, 118, 119, 120, 121, 122, 123])
-    all_param_1dof_trans_idxs = torch.LongTensor([124, 125, 126, 127, 128, 129])
-    # fmt: on
-    num_3dof_angles = len(all_param_3dof_rot_idxs) * 3
-    num_1dof_angles = len(all_param_1dof_rot_idxs)
-    num_1dof_trans = len(all_param_1dof_trans_idxs)
-    assert body_pose_cont.shape[-1] == (
-        2 * num_3dof_angles + 2 * num_1dof_angles + num_1dof_trans
-    )
-    # Get subsets
-    body_cont_3dofs = body_pose_cont[..., : 2 * num_3dof_angles]
-    body_cont_1dofs = body_pose_cont[
-        ..., 2 * num_3dof_angles : 2 * num_3dof_angles + 2 * num_1dof_angles
-    ]
-    body_cont_trans = body_pose_cont[..., 2 * num_3dof_angles + 2 * num_1dof_angles :]
-    # Convert conts to model params
-    ## First for 3dofs
-    body_cont_3dofs = body_cont_3dofs.unflatten(-1, (-1, 6))
-    body_rotmat_3dofs = batch9Dfrom6D(body_cont_3dofs).flatten(-2, -1)
-    ## Next for 1dofs
-    body_cont_1dofs = body_cont_1dofs.unflatten(-1, (-1, 2))  # (sincos)
-    body_rotmat_1dofs = batch4Dfrom2D(body_cont_1dofs).flatten(-2, -1)
-    if inflate_trans:
-        assert (
-            False
-        ), "This is left as a possibility to increase the space/contribution/supervision trans params gets compared to rots"
-    else:
-        ## Nothing to do for trans
-        body_rotmat_trans = body_cont_trans
-    # Put them together
-    body_rotmat_params = torch.cat(
-        [body_rotmat_3dofs, body_rotmat_1dofs, body_rotmat_trans], dim=-1
-    )
-    return body_rotmat_params
-
-
 _BODY_IDX_CACHE: dict = {}
 
 
@@ -349,8 +226,6 @@ def compact_cont_to_model_params_body(body_pose_cont):
     (all_param_3dof_rot_idxs, all_param_1dof_rot_idxs, all_param_1dof_trans_idxs, idxs_3dof_flat) = _body_idxs(body_pose_cont.device)
     num_3dof_angles = len(all_param_3dof_rot_idxs) * 3
     num_1dof_angles = len(all_param_1dof_rot_idxs)
-    num_1dof_trans = len(all_param_1dof_trans_idxs)
-    assert body_pose_cont.shape[-1] == 2 * num_3dof_angles + 2 * num_1dof_angles + num_1dof_trans
     # Get subsets
     body_cont_3dofs = body_pose_cont[..., : 2 * num_3dof_angles]
     body_cont_1dofs = body_pose_cont[..., 2 * num_3dof_angles : 2 * num_3dof_angles + 2 * num_1dof_angles]
@@ -372,42 +247,10 @@ def compact_cont_to_model_params_body(body_pose_cont):
     return body_pose_params
 
 
-def compact_model_params_to_cont_body(body_pose_params):
-    # fmt: off
-    all_param_3dof_rot_idxs = torch.LongTensor([(0, 2, 4), (6, 8, 10), (12, 13, 14), (15, 16, 17), (18, 19, 20), (21, 22, 23), (24, 25, 26), (27, 28, 29), (34, 35, 36), (37, 38, 39), (44, 45, 46), (53, 54, 55), (64, 65, 66), (85, 69, 73), (86, 70, 79), (87, 71, 82), (88, 72, 76), (91, 92, 93), (112, 96, 100), (113, 97, 106), (114, 98, 109), (115, 99, 103), (130, 131, 132)])
-    all_param_1dof_rot_idxs = torch.LongTensor([1, 3, 5, 7, 9, 11, 30, 31, 32, 33, 40, 41, 42, 43, 47, 48, 49, 50, 51, 52, 56, 57, 58, 59, 60, 61, 62, 63, 67, 68, 74, 75, 77, 78, 80, 81, 83, 84, 89, 90, 94, 95, 101, 102, 104, 105, 107, 108, 110, 111, 116, 117, 118, 119, 120, 121, 122, 123])
-    all_param_1dof_trans_idxs = torch.LongTensor([124, 125, 126, 127, 128, 129])
-    # fmt: on
-    num_3dof_angles = len(all_param_3dof_rot_idxs) * 3
-    num_1dof_angles = len(all_param_1dof_rot_idxs)
-    num_1dof_trans = len(all_param_1dof_trans_idxs)
-    assert body_pose_params.shape[-1] == (
-        num_3dof_angles + num_1dof_angles + num_1dof_trans
-    )
-    # Take out params
-    body_params_3dofs = body_pose_params[..., all_param_3dof_rot_idxs.flatten()]
-    body_params_1dofs = body_pose_params[..., all_param_1dof_rot_idxs]
-    body_params_trans = body_pose_params[..., all_param_1dof_trans_idxs]
-    # params to cont
-    body_cont_3dofs = batch6DFromXYZ(body_params_3dofs.unflatten(-1, (-1, 3))).flatten(
-        -2, -1
-    )
-    body_cont_1dofs = torch.stack(
-        [body_params_1dofs.sin(), body_params_1dofs.cos()], dim=-1
-    ).flatten(-2, -1)
-    body_cont_trans = body_params_trans
-    # Put them together
-    body_pose_cont = torch.cat(
-        [body_cont_3dofs, body_cont_1dofs, body_cont_trans], dim=-1
-    )
-    return body_pose_cont
-
-
-# fmt: off
-mhr_param_hand_idxs = [62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115]
-mhr_cont_hand_idxs = [72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237]
+# Hand indices into the 133-dim param and 260-dim cont body-pose vectors.
+mhr_param_hand_idxs = list(range(62, 116))
+mhr_cont_hand_idxs = list(range(72, 132)) + list(range(190, 238))
 mhr_param_hand_mask = torch.zeros(133).bool()
 mhr_param_hand_mask[mhr_param_hand_idxs] = True
 mhr_cont_hand_mask = torch.zeros(260).bool()
 mhr_cont_hand_mask[mhr_cont_hand_idxs] = True
-# fmt: on
diff --git a/comfy/ldm/sam3d_body/model/camera_modules.py b/comfy/ldm/sam3d_body/model/camera_modules.py
index 0faff8534..c4a3d967e 100644
--- a/comfy/ldm/sam3d_body/model/camera_modules.py
+++ b/comfy/ldm/sam3d_body/model/camera_modules.py
@@ -43,15 +43,6 @@ class FourierPositionEncoding(nn.Module):
         self.num_bands = num_bands
         self.max_resolution = [max_resolution] * n
 
-    @property
-    def channels(self):
-        num_dims = len(self.max_resolution)
-        encoding_size = self.num_bands * num_dims
-        encoding_size *= 2  # sin-cos
-        encoding_size += num_dims  # concat
-
-        return encoding_size
-
     def forward(self, pos: torch.Tensor):
         fourier_pos_enc = _generate_fourier_features(pos, num_bands=self.num_bands, max_resolution=self.max_resolution)
         return fourier_pos_enc
@@ -118,9 +109,7 @@ class PerspectiveHead(nn.Module):
         pred_cam: torch.Tensor,
         bbox_center: torch.Tensor, # [N, 2], in original image space (w, h)
         bbox_size: torch.Tensor, # [N,], in original image space
-        img_size: torch.Tensor,
         cam_int: torch.Tensor, # [B, 3, 3]
-        use_intrin_center: bool = False,
     ):
         batch_size = points_3d.shape[0]
         pred_cam = pred_cam.clone()
@@ -133,12 +122,8 @@ class PerspectiveHead(nn.Module):
         focal_length = cam_int[:, 0, 0]
         tz = 2 * focal_length / bs
 
-        if not use_intrin_center:
-            cx = 2 * (bbox_center[:, 0] - (img_size[:, 0] / 2)) / bs
-            cy = 2 * (bbox_center[:, 1] - (img_size[:, 1] / 2)) / bs
-        else:
-            cx = 2 * (bbox_center[:, 0] - (cam_int[:, 0, 2])) / bs
-            cy = 2 * (bbox_center[:, 1] - (cam_int[:, 1, 2])) / bs
+        cx = 2 * (bbox_center[:, 0] - cam_int[:, 0, 2]) / bs
+        cy = 2 * (bbox_center[:, 1] - cam_int[:, 1, 2]) / bs
 
         pred_cam_t = torch.stack([tx + cx, ty + cy, tz], dim=-1)
 
diff --git a/comfy/ldm/sam3d_body/model/model.py b/comfy/ldm/sam3d_body/model/model.py
index 9d1a53ec8..2063ce559 100644
--- a/comfy/ldm/sam3d_body/model/model.py
+++ b/comfy/ldm/sam3d_body/model/model.py
@@ -37,20 +37,15 @@ class SAM3DBody(nn.Module):
 
     def __init__(self, device=None, dtype=None, operations=None):
         super().__init__()
-        # `operations` falls back to torch.nn so the model is constructible
-        # without comfy.ops; matches the pattern in comfy/ldm/sam3/.
-        ops = operations if operations is not None else nn
-
         # Per-batch state populated by `_initialize_batch`.
         self._max_num_person = None
-        self._person_valid = None
 
         self.register_buffer("image_mean", torch.tensor(IMAGE_MEAN).view(-1, 1, 1), False)
         self.register_buffer("image_std", torch.tensor(IMAGE_STD).view(-1, 1, 1), False)
 
         self.image_size = IMAGE_SIZE
 
-        self.backbone = DINOv3ViTModel(DINOV3_VITH_CONFIG, dtype=dtype, device=device, operations=ops)
+        self.backbone = DINOv3ViTModel(DINOV3_VITH_CONFIG, dtype=dtype, device=device, operations=operations)
         embed_dims = self.backbone.embed_dims
 
         # MHR rig shared between body + hand pose heads via a non-registered
@@ -72,7 +67,7 @@ class SAM3DBody(nn.Module):
         self.head_pose.hand_pose_comps.data = (
             torch.eye(54).to(self.head_pose.hand_pose_comps.data).float()
         )
-        self.init_pose = ops.Embedding(1, self.head_pose.npose, device=device, dtype=dtype)
+        self.init_pose = operations.Embedding(1, self.head_pose.npose, device=device, dtype=dtype)
 
         self.head_pose_hand = MHRHead(enable_hand_model=True, **head_kwargs)
         self.head_pose_hand.hand_pose_comps_ori = nn.Parameter(
@@ -81,7 +76,7 @@ class SAM3DBody(nn.Module):
         self.head_pose_hand.hand_pose_comps.data = (
             torch.eye(54).to(self.head_pose_hand.hand_pose_comps.data).float()
         )
-        self.init_pose_hand = ops.Embedding(
+        self.init_pose_hand = operations.Embedding(
             1, self.head_pose_hand.npose, device=device, dtype=dtype
         )
 
@@ -93,25 +88,25 @@ class SAM3DBody(nn.Module):
             device=device, dtype=dtype, operations=operations,
         )
         self.head_camera = PerspectiveHead(**camera_kwargs)
-        self.init_camera = ops.Embedding(1, self.head_camera.ncam, device=device, dtype=dtype)
+        self.init_camera = operations.Embedding(1, self.head_camera.ncam, device=device, dtype=dtype)
 
         self.head_camera_hand = PerspectiveHead(default_scale_factor=CAMERA_DEFAULT_SCALE_FACTOR_HAND, **camera_kwargs)
-        self.init_camera_hand = ops.Embedding(1, self.head_camera_hand.ncam, device=device, dtype=dtype)
+        self.init_camera_hand = operations.Embedding(1, self.head_camera_hand.ncam, device=device, dtype=dtype)
 
         cond_dim = 3
         init_dim = self.head_pose.npose + self.head_camera.ncam + cond_dim
         linear_kwargs = dict(device=device, dtype=dtype)
-        self.init_to_token_mhr = ops.Linear(init_dim, DECODER_DIM, **linear_kwargs)
-        self.prev_to_token_mhr = ops.Linear(init_dim - cond_dim, DECODER_DIM, **linear_kwargs)
-        self.init_to_token_mhr_hand = ops.Linear(init_dim, DECODER_DIM, **linear_kwargs)
-        self.prev_to_token_mhr_hand = ops.Linear(init_dim - cond_dim, DECODER_DIM, **linear_kwargs)
+        self.init_to_token_mhr = operations.Linear(init_dim, DECODER_DIM, **linear_kwargs)
+        self.prev_to_token_mhr = operations.Linear(init_dim - cond_dim, DECODER_DIM, **linear_kwargs)
+        self.init_to_token_mhr_hand = operations.Linear(init_dim, DECODER_DIM, **linear_kwargs)
+        self.prev_to_token_mhr_hand = operations.Linear(init_dim - cond_dim, DECODER_DIM, **linear_kwargs)
 
         self.prompt_encoder = PromptEncoder(
             embed_dim=embed_dims,  # match backbone dims so PE adds directly
             num_body_joints=N_KEYPOINTS,
             device=device, dtype=dtype, operations=operations,
         )
-        self.prompt_to_token = ops.Linear(embed_dims, DECODER_DIM, **linear_kwargs)
+        self.prompt_to_token = operations.Linear(embed_dims, DECODER_DIM, **linear_kwargs)
 
         decoder_kwargs = dict(
             dims=DECODER_DIM,
@@ -141,11 +136,10 @@ class SAM3DBody(nn.Module):
 
         self.keypoint_embedding_idxs = list(range(N_KEYPOINTS))
         self.keypoint_embedding_idxs_hand = list(range(N_KEYPOINTS))
-        self.keypoint_embedding = ops.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
-        self.keypoint_embedding_hand = ops.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
+        self.keypoint_embedding = operations.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
+        self.keypoint_embedding_hand = operations.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
 
-        self.hand_box_embedding = ops.Embedding(2, DECODER_DIM, **linear_kwargs)
-        self.hand_cls_embed = ops.Linear(DECODER_DIM, 2, **linear_kwargs)
+        self.hand_box_embedding = operations.Embedding(2, DECODER_DIM, **linear_kwargs)
         self.bbox_embed = MLP(
             input_dim=DECODER_DIM, hidden_dim=DECODER_DIM,
             output_dim=4, num_layers=3,
@@ -158,13 +152,13 @@ class SAM3DBody(nn.Module):
         )
         self.keypoint_posemb_linear = MLP(input_dim=2, **posemb_kwargs)
         self.keypoint_posemb_linear_hand = MLP(input_dim=2, **posemb_kwargs)
-        self.keypoint_feat_linear = ops.Linear(embed_dims, DECODER_DIM, **linear_kwargs)
-        self.keypoint_feat_linear_hand = ops.Linear(embed_dims, DECODER_DIM, **linear_kwargs)
+        self.keypoint_feat_linear = operations.Linear(embed_dims, DECODER_DIM, **linear_kwargs)
+        self.keypoint_feat_linear_hand = operations.Linear(embed_dims, DECODER_DIM, **linear_kwargs)
 
         self.keypoint3d_embedding_idxs = list(range(N_KEYPOINTS))
         self.keypoint3d_embedding_idxs_hand = list(range(N_KEYPOINTS))
-        self.keypoint3d_embedding = ops.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
-        self.keypoint3d_embedding_hand = ops.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
+        self.keypoint3d_embedding = operations.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
+        self.keypoint3d_embedding_hand = operations.Embedding(N_KEYPOINTS, DECODER_DIM, **linear_kwargs)
         self.keypoint3d_posemb_linear = MLP(input_dim=3, **posemb_kwargs)
         self.keypoint3d_posemb_linear_hand = MLP(input_dim=3, **posemb_kwargs)
 
@@ -183,11 +177,9 @@ class SAM3DBody(nn.Module):
     def _initialize_batch(self, batch: Dict) -> None:
         if batch["img"].dim() == 5:
             self._batch_size, self._max_num_person = batch["img"].shape[:2]
-            self._person_valid = self._flatten_person(batch["person_valid"]) > 0
         else:
             self._batch_size = batch["img"].shape[0]
             self._max_num_person = 0
-            self._person_valid = None
 
     def _flatten_person(self, x: torch.Tensor) -> torch.Tensor:
         assert self._max_num_person is not None, "No max_num_person initialized"
@@ -258,11 +250,9 @@ class SAM3DBody(nn.Module):
         if is_multi_image:
             assert isinstance(img, list)
             n = len(img)
-            H_src, W_src = img[0].shape[:2]
             src_t = torch.stack(list(img), dim=0)
         else:
             n = int(left_xyxy.shape[0])
-            H_src, W_src = img.shape[:2]
             src_t = img.unsqueeze(0).expand(n, -1, -1, -1)
 
         H_out, W_out = int(self.image_size[0]), int(self.image_size[1])
@@ -292,14 +282,12 @@ class SAM3DBody(nn.Module):
         zero_mask_score = torch.zeros((n,), dtype=torch.float32, device=device)
         person_valid = torch.ones((1, n), dtype=torch.float32, device=device)
         img_size = torch.tensor([W_out, H_out], dtype=torch.float32, device=device).expand(n, 2).contiguous()
-        ori_img_size = torch.tensor([W_src, H_src], dtype=torch.float32, device=device).expand(n, 2).contiguous()
         cam_int_dev = cam_int.to(device).to(dtype=torch.float32)
 
         def _build(centers_t, scales_t, mats_t, img_t, boxes_xyxy):
             return {
                 "img": img_t.unsqueeze(0),  # (1, N, 3, H_out, W_out)
                 "img_size": img_size.unsqueeze(0),
-                "ori_img_size": ori_img_size.unsqueeze(0),
                 "bbox_center": centers_t.to(device).unsqueeze(0),
                 "bbox_scale": scales_t.to(device).unsqueeze(0),
                 "bbox": torch.as_tensor(boxes_xyxy, dtype=torch.float32).to(device).unsqueeze(0),
@@ -349,7 +337,6 @@ class SAM3DBody(nn.Module):
         self,
         branch: str,
         image_embeddings: torch.Tensor,
-        init_estimate: Optional[torch.Tensor] = None,
         keypoints: Optional[torch.Tensor] = None,
         prev_estimate: Optional[torch.Tensor] = None,
         condition_info: Optional[torch.Tensor] = None,
@@ -359,7 +346,6 @@ class SAM3DBody(nn.Module):
         of the pipeline is shared.
 
         image_embeddings: (B, C, H, W) backbone features.
-        init_estimate:    (B, 1, C) initial pose+cam estimate to refine.
         keypoints:        (B, N, 3) prompts as (x, y in [0, 1], label).
                           label: 0..K = joint, -1 = incorrect, -2 = invalid.
         prev_estimate:    (B, 1, C) previous estimate for pose refinement.
@@ -402,15 +388,11 @@ class SAM3DBody(nn.Module):
 
         # .to(image_embeddings) moves weights CPU→GPU under dynamic loading
         # (they stay on CPU until first use).
-        if init_estimate is None:
-            init_pose = init_pose_emb.weight.to(image_embeddings).expand(batch_size, -1).unsqueeze(1)
-            init_camera = init_camera_emb.weight.to(image_embeddings).expand(batch_size, -1).unsqueeze(1)
-            init_estimate = torch.cat([init_pose, init_camera], dim=-1)  # B x 1 x (404 + 3)
+        init_pose = init_pose_emb.weight.to(image_embeddings).expand(batch_size, -1).unsqueeze(1)
+        init_camera = init_camera_emb.weight.to(image_embeddings).expand(batch_size, -1).unsqueeze(1)
+        init_estimate = torch.cat([init_pose, init_camera], dim=-1)  # B x 1 x (404 + 3)
 
-        init_input = (
-            torch.cat([condition_info.view(batch_size, 1, -1), init_estimate], dim=-1)
-            if condition_info is not None else init_estimate
-        )
+        init_input = torch.cat([condition_info.view(batch_size, 1, -1), init_estimate], dim=-1)
         token_embeddings = init_to_token(init_input).view(batch_size, 1, -1)
         num_pose_token = token_embeddings.shape[1]  # always 1
 
@@ -495,9 +477,8 @@ class SAM3DBody(nn.Module):
 
     def _get_mask_prompt(self, batch, image_embeddings):
         x_mask = self._flatten_person(batch["mask"])
-        # batch tensors are fp32 from prepare_batch; mask_downscaling is in the
-        # Loader's dtype — cast once so the conv input matches.
         x_mask = x_mask.to(image_embeddings.dtype)
+
         mask_embeddings, no_mask_embeddings = self.prompt_encoder.get_mask_embeddings(
             x_mask, image_embeddings.shape[0], image_embeddings.shape[2:]
         )
@@ -546,7 +527,6 @@ class SAM3DBody(nn.Module):
         # expand+contiguous for the vertices branch.
         bbox_center = self._flatten_person(batch["bbox_center"])[batch_idx]
         bbox_scale = self._flatten_person(batch["bbox_scale"])[batch_idx, 0]
-        ori_img_size = self._flatten_person(batch["ori_img_size"])[batch_idx]
         cam_int = self._flatten_person(
             batch["cam_int"]
             .unsqueeze(1)
@@ -556,8 +536,7 @@ class SAM3DBody(nn.Module):
 
         def _project(points_3d):
             return head_camera.perspective_projection(
-                points_3d, pred_cam, bbox_center, bbox_scale, ori_img_size, cam_int,
-                use_intrin_center=True,
+                points_3d, pred_cam, bbox_center, bbox_scale, cam_int,
             )
 
         cam_out = _project(pose_output["pred_keypoints_3d"])
@@ -632,7 +611,6 @@ class SAM3DBody(nn.Module):
             tokens_output, pose_output = self.forward_decoder(
                 "body",
                 image_embeddings[self.body_batch_idx],
-                init_estimate=None,
                 keypoints=keypoints_prompt[self.body_batch_idx],
                 prev_estimate=None,
                 condition_info=condition_info[self.body_batch_idx],
@@ -643,7 +621,6 @@ class SAM3DBody(nn.Module):
             tokens_output_hand, pose_output_hand = self.forward_decoder(
                 "hand",
                 image_embeddings[self.hand_batch_idx],
-                init_estimate=None,
                 keypoints=keypoints_prompt[self.hand_batch_idx],
                 prev_estimate=None,
                 condition_info=condition_info[self.hand_batch_idx],
@@ -661,10 +638,8 @@ class SAM3DBody(nn.Module):
         # match the head-MLP external contract (_get_hand_box would .float() anyway).
         if len(self.body_batch_idx):
             output["mhr"]["hand_box"] = self.bbox_embed(tokens_output).sigmoid().float()
-            output["mhr"]["hand_logits"] = self.hand_cls_embed(tokens_output).float()
         if len(self.hand_batch_idx):
             output["mhr_hand"]["hand_box"] = self.bbox_embed(tokens_output_hand).sigmoid()
-            output["mhr_hand"]["hand_logits"] = self.hand_cls_embed(tokens_output_hand)
 
         return output
 
@@ -715,10 +690,10 @@ class SAM3DBody(nn.Module):
         # Concat lhand+rhand along dim 0 so backbone+decoder run once on
         # (2, num_person, ...) — saves one full DINOv3 ViT-H+ pass.
         batch_hands = self._concat_hand_batches(batch_lhand, batch_rhand)
-        saved_batch_state = (self._batch_size, self._max_num_person, self._person_valid)
+        saved_batch_state = (self._batch_size, self._max_num_person)
         self._initialize_batch(batch_hands)
         hands_output = self.forward_step(batch_hands, decoder_type="hand")
-        self._batch_size, self._max_num_person, self._person_valid = saved_batch_state
+        self._batch_size, self._max_num_person = saved_batch_state
         n_left = batch_lhand["img"].shape[0] * batch_lhand["img"].shape[1]
         lhand_output, rhand_output = self._split_hand_output(hands_output, n_left)
         # Free the batched image_embeddings/condition_info (unused downstream);
@@ -808,9 +783,7 @@ class SAM3DBody(nn.Module):
         # to get an updated body pose estimation.
         self._set_active_branch("body")
 
-        right_kps_full = rhand_output["mhr_hand"]["pred_keypoints_2d"][:, [kps_right_wrist_idx]].clone()
-        left_kps_full = lhand_output["mhr_hand"]["pred_keypoints_2d"][:, [kps_right_wrist_idx]].clone()
-        left_kps_full[:, :, 0] = width - left_kps_full[:, :, 0] - 1
+        # right_kps_full / left_kps_full already computed above (unchanged since).
         right_kps_crop = self._full_to_crop(batch, right_kps_full)
         left_kps_crop = self._full_to_crop(batch, left_kps_full)
 
@@ -1030,7 +1003,6 @@ class SAM3DBody(nn.Module):
         _, pose_output = self.forward_decoder(
             "body",
             image_embeddings,
-            init_estimate=None,  # use the default init, not the prev estimate
             keypoints=keypoint_prompt,
             prev_estimate=prev_estimate,
             condition_info=condition_info,
diff --git a/comfy/ldm/sam3d_body/model/prompt.py b/comfy/ldm/sam3d_body/model/prompt.py
index 2a5466276..5b2ec232d 100644
--- a/comfy/ldm/sam3d_body/model/prompt.py
+++ b/comfy/ldm/sam3d_body/model/prompt.py
@@ -29,38 +29,37 @@ class PromptEncoder(nn.Module):
         Encodes prompts for input to SAM's mask decoder.
         """
         super().__init__()
-        ops = operations if operations is not None else nn
         self.embed_dim = embed_dim
         self.num_body_joints = num_body_joints
 
         # Keypoint prompts
         self.pe_layer = PositionEmbeddingRandom(embed_dim // 2)
         self.point_embeddings = nn.ModuleList(
-            [ops.Embedding(1, embed_dim, device=device, dtype=dtype) for _ in range(self.num_body_joints)]
+            [operations.Embedding(1, embed_dim, device=device, dtype=dtype) for _ in range(self.num_body_joints)]
         )
-        self.not_a_point_embed = ops.Embedding(1, embed_dim, device=device, dtype=dtype)
-        self.invalid_point_embed = ops.Embedding(1, embed_dim, device=device, dtype=dtype)
+        self.not_a_point_embed = operations.Embedding(1, embed_dim, device=device, dtype=dtype)
+        self.invalid_point_embed = operations.Embedding(1, embed_dim, device=device, dtype=dtype)
 
         # Mask prompt: 5-stage 2x2 strided conv downscaling to embed_dim.
-        LN2d = LayerNorm2d_op(ops)
+        LN2d = LayerNorm2d_op(operations)
         mask_in_chans = 256
         self.mask_downscaling = nn.Sequential(
-            ops.Conv2d(1, mask_in_chans // 64, kernel_size=2, stride=2, device=device, dtype=dtype),
+            operations.Conv2d(1, mask_in_chans // 64, kernel_size=2, stride=2, device=device, dtype=dtype),
             LN2d(mask_in_chans // 64, device=device, dtype=dtype),
             nn.GELU(),
-            ops.Conv2d(mask_in_chans // 64, mask_in_chans // 16, kernel_size=2, stride=2, device=device, dtype=dtype),
+            operations.Conv2d(mask_in_chans // 64, mask_in_chans // 16, kernel_size=2, stride=2, device=device, dtype=dtype),
             LN2d(mask_in_chans // 16, device=device, dtype=dtype),
             nn.GELU(),
-            ops.Conv2d(mask_in_chans // 16, mask_in_chans // 4, kernel_size=2, stride=2, device=device, dtype=dtype),
+            operations.Conv2d(mask_in_chans // 16, mask_in_chans // 4, kernel_size=2, stride=2, device=device, dtype=dtype),
             LN2d(mask_in_chans // 4, device=device, dtype=dtype),
             nn.GELU(),
-            ops.Conv2d(mask_in_chans // 4, mask_in_chans, kernel_size=2, stride=2, device=device, dtype=dtype),
+            operations.Conv2d(mask_in_chans // 4, mask_in_chans, kernel_size=2, stride=2, device=device, dtype=dtype),
             LN2d(mask_in_chans, device=device, dtype=dtype),
             nn.GELU(),
-            ops.Conv2d(mask_in_chans, embed_dim, kernel_size=1, device=device, dtype=dtype),
+            operations.Conv2d(mask_in_chans, embed_dim, kernel_size=1, device=device, dtype=dtype),
         )
         # Trained values for the gating conv and no_mask_embed are loaded from the state dict
-        self.no_mask_embed = ops.Embedding(1, embed_dim, device=device, dtype=dtype)
+        self.no_mask_embed = operations.Embedding(1, embed_dim, device=device, dtype=dtype)
 
     def get_dense_pe(self, size: Tuple[int, int]) -> torch.Tensor:
         """Positional encoding over the image-embedding grid; (1, C, H, W)."""
@@ -120,8 +119,7 @@ class PromptEncoder(nn.Module):
             Bx(embed_dim)x(embed_H)x(embed_W)
         """
         bs = self._get_batch_size(keypoints, boxes, masks)
-        # Anchor device on the input prompts so we don't pull the offloaded
-        # CPU embedding device under dynamic loading.
+
         ref = keypoints if keypoints is not None else boxes if boxes is not None else masks
         device = ref.device if ref is not None else self.point_embeddings[0].weight.device
         weight_dtype = self.invalid_point_embed.weight.dtype
@@ -136,23 +134,10 @@ class PromptEncoder(nn.Module):
 
         return sparse_embeddings, sparse_masks
 
-    def get_mask_embeddings(
-        self,
-        masks: Optional[torch.Tensor] = None,
-        bs: int = 1,
-        size: Tuple[int, int] = (16, 16),  # [H, W]
-    ) -> torch.Tensor:
-        """Embeds mask inputs."""
-        # masks is always on the active device when present; fall back to the
-        # downscaling Conv's weight device when it isn't (rare callers).
-        ref = masks if masks is not None else next(self.mask_downscaling.parameters())
-        no_mask_embeddings = self.no_mask_embed.weight.to(ref).reshape(1, -1, 1, 1).expand(
-            bs, -1, size[0], size[1]
-        )
-        if masks is not None:
-            mask_embeddings = self.mask_downscaling(masks)
-        else:
-            mask_embeddings = no_mask_embeddings
+    def get_mask_embeddings(self, masks: torch.Tensor, bs: int = 1, size: Tuple[int, int] = (16, 16)) -> torch.Tensor:
+        """Embeds mask inputs. Caller casts both outputs to its working dtype."""
+        no_mask_embeddings = self.no_mask_embed.weight.reshape(1, -1, 1, 1).expand(bs, -1, size[0], size[1])
+        mask_embeddings = self.mask_downscaling(masks)
         return mask_embeddings, no_mask_embeddings
 
 
@@ -170,12 +155,9 @@ class PromptableDecoder(nn.Module):
         repeat_pe: bool = False,
         do_interm_preds: bool = False,
         keypoint_token_update: bool = False,
-        device=None,
-        dtype=None,
-        operations=None,
+        device=None, dtype=None, operations=None,
     ):
         super().__init__()
-        ops = operations if operations is not None else nn
 
         self.layers = nn.ModuleList(
             TransformerDecoderLayer(
@@ -193,7 +175,7 @@ class PromptableDecoder(nn.Module):
             for i in range(depth)
         )
 
-        self.norm_final = ops.LayerNorm(dims, eps=1e-6, device=device, dtype=dtype)
+        self.norm_final = operations.LayerNorm(dims, eps=1e-6, device=device, dtype=dtype)
         self.do_interm_preds = do_interm_preds
         self.keypoint_token_update = keypoint_token_update
 
diff --git a/comfy/ldm/sam3d_body/utils.py b/comfy/ldm/sam3d_body/utils.py
index 45b7cb014..d3e5d36c8 100644
--- a/comfy/ldm/sam3d_body/utils.py
+++ b/comfy/ldm/sam3d_body/utils.py
@@ -166,12 +166,10 @@ def prepare_batch(
             mask_score_t = torch.ones((n,), dtype=torch.float32)
 
     img_size_t = torch.tensor([W_out, H_out], dtype=torch.float32).expand(n, 2).contiguous()
-    ori_img_size_t = torch.tensor([width, height], dtype=torch.float32).expand(n, 2).contiguous()
 
     batch = {
         "img": img_t.unsqueeze(0),                  # (1, N, 3, H_out, W_out)
         "img_size": img_size_t.unsqueeze(0),        # (1, N, 2)
-        "ori_img_size": ori_img_size_t.unsqueeze(0),# (1, N, 2)
         "bbox_center": centers.unsqueeze(0),        # (1, N, 2)
         "bbox_scale": scales.unsqueeze(0),          # (1, N, 2)
         "bbox": boxes_t.unsqueeze(0),               # (1, N, 4)
diff --git a/comfy_extras/sam3d_body/export/bvh.py b/comfy_extras/sam3d_body/export/bvh.py
index e690a7b86..7e4a9c1a5 100644
--- a/comfy_extras/sam3d_body/export/bvh.py
+++ b/comfy_extras/sam3d_body/export/bvh.py
@@ -1,11 +1,9 @@
 """BVH export for SAM 3D Body pose_data.
 
-BVH stores explicit bone OFFSETs per joint, so any standard importer
-(Blender, Maya, MotionBuilder, etc.) reconstructs anatomical bone orientations
-directly — no heuristic guessing as needed for glTF. We skip the rig's joint 0
-(static world anchor) and use joint 1 as the BVH ROOT (6 channels: XYZ pos +
-ZXY rot); every other joint gets 3 channels (ZXY rot only). Rotations are
-intrinsic Z-X-Y Euler degrees.
+BVH stores explicit bone OFFSETs per joint, so standard importers reconstruct
+anatomical bone orientations directly (unlike glTF). We skip the rig's joint 0
+(static world anchor) and use joint 1 as the ROOT (6 channels: XYZ pos + ZXY
+rot); other joints get 3 channels. Rotations are intrinsic Z-X-Y Euler degrees.
 """
 
 from __future__ import annotations
@@ -49,13 +47,10 @@ def _quat_to_zxy_euler_deg(quat: np.ndarray) -> np.ndarray:
 
 
 def _find_bvh_root(parents: np.ndarray, is_external: bool = False) -> int:
-    """First child of the rig's world anchor so the static origin→body stick
-    bone gets left out. Falls back to the first root joint.
-
-    MHR's joint 0 is a static world anchor whose single child is the pelvis, so
-    skipping it is correct. External rigs (e.g. SOMA-77) whose root is already
-    the articulated body root with multiple child chains must keep the root —
-    descending into one child would drop the sibling limbs from the BVH."""
+    """First child of the rig's world anchor, dropping the origin→body stick.
+    Falls back to the first root joint. External rigs whose root is already the
+    articulated body root with multiple child chains keep the root — descending
+    into one child would drop the sibling limbs."""
     NJ = parents.shape[0]
     world_anchors = [j for j in range(NJ)
                      if not (0 <= int(parents[j]) < NJ and int(parents[j]) != j)]
@@ -93,14 +88,11 @@ def build_bvh(
     track_index: int = -1,
     units: str = "cm",
 ) -> bytes:
-    """Build a BVH file from pose_data. Returns UTF-8 encoded text bytes.
+    """Build a BVH file from pose_data. Returns UTF-8 text bytes.
 
     `model` may be None when pose_data carries a `_skeleton_override` (external
-    rigs, e.g. Kimodo); the rig hierarchy/offsets/bind are read from the
-    override instead of the MHR model.
-
-    `units` is "cm" (default, standard mocap convention) or "m". Affects the
-    OFFSET and root-position values; rotations are independent of units.
+    rigs); the rig hierarchy/offsets/bind come from the override. `units` is
+    "cm" (default) or "m" — affects OFFSET/root-position, not rotations.
     """
     if units not in ("cm", "m"):
         raise ValueError(f"build_bvh: units must be 'cm' or 'm', got {units!r}")
@@ -123,10 +115,8 @@ def build_bvh(
     body_root = _find_bvh_root(parents, is_external)
     children_map = _build_children_map(parents)
 
-    # Bone OFFSETs come from MHR's translation_offsets (joint position
-    # relative to parent in parent's local-bind frame). For the BVH root,
-    # we use its bind world position so the skeleton sits at the right
-    # spot when imported.
+    # Bone OFFSETs = translation_offsets (joint position relative to parent).
+    # The BVH root uses its bind world position so the skeleton imports in place.
     bind_global = rig.bind_global_cm                         # (NJ, 8) cm
     bind_pos_m = bind_global[:, :3].astype(np.float64) * 0.01  # (NJ, 3) m
     offset_m = rig.joint_offsets_cm.astype(np.float64) * 0.01
@@ -139,9 +129,8 @@ def build_bvh(
             _visit(c)
     _visit(body_root)
 
-    # Use pose_data's stored pred_global_rots/pred_joint_coords (authoritative)
-    # rather than re-running rig.forward, then derive locals with body_root
-    # treated as the hierarchy root in BVH-space.
+    # Stored pred_global_rots/pred_joint_coords (authoritative); derive locals
+    # with body_root as the BVH-space hierarchy root.
     rig_global_m = global_skel_state_from_pose_data(
         pose_data, frame_indices, person_k, NJ,
         joint_coords_y_down=rig.per_frame_y_down,
@@ -203,9 +192,8 @@ def build_bvh(
     lines.append(f"Frames: {n_frames}")
     lines.append(f"Frame Time: {1.0 / float(fps):.6f}")
 
-    # Channel matrix: root pos (3) + root rot (3) + non-root rots (3 each) per
-    # frame, columns in `bvh_order` order. Vectorized — savetxt's C-side
-    # formatting beats Python f-strings by ~10× on long clips.
+    # Channel matrix per frame: root pos (3) + root rot (3) + non-root rots
+    # (3 each), columns in `bvh_order`. savetxt is far faster than f-strings.
     non_root_idx = np.asarray(bvh_order[1:], dtype=np.int64)
     motion = np.concatenate([
         root_pos_m * unit_scale,                                 # (N, 3)
diff --git a/comfy_extras/sam3d_body/export/capsules.py b/comfy_extras/sam3d_body/export/capsules.py
index 50fe33a5f..ece5ecc5b 100644
--- a/comfy_extras/sam3d_body/export/capsules.py
+++ b/comfy_extras/sam3d_body/export/capsules.py
@@ -1,12 +1,9 @@
-"""3D capsule rendering for OpenPose-style skeletons — SCAIL-Pose-equivalent
-torch ray-marching SDF renderer adapted to SAM3DBody pose_data.
+"""3D capsule rendering for OpenPose-style skeletons (SCAIL-Pose look).
 
-Each limb is drawn as a true 3D capsule (cylinder + hemispherical caps),
-projected through the per-person camera (`pred_cam_t` + `focal_length` +
-image_size) so closer limbs appear thicker/brighter — the SCAIL-Pose
-visual style. Self-contained: no dependency on the SCAIL-Pose package.
-
-Output: (H, W, 3) fp32 torch.Tensor in [0, 1].
+Each limb is a true 3D capsule (cylinder + hemispherical caps), projected
+through the per-person camera (`pred_cam_t` + `focal_length` + image_size) so
+closer limbs appear thicker/brighter. Self-contained analytic ray-capsule
+renderer. Output: (H, W, 3) fp32 torch.Tensor in [0, 1].
 """
 
 from typing import Any, Dict, List, Optional, Tuple
@@ -41,14 +38,12 @@ def _build_specs_from_pose(
     palette: str,
     person_brightness_falloff: float = 0.0,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """Flatten body + optional hand limbs for one frame into
-    (starts, ends, colors_rgba, is_hand) in camera coords (Y-down, +Z forward).
-    Drops endpoints that are non-finite or behind the camera. `is_hand` flags
-    the hand limbs so the renderer can draw them thinner.
+    """Flatten body + optional hand limbs for one frame into (starts, ends,
+    colors_rgba, is_hand) in camera coords (Y-down, +Z forward). Drops non-finite
+    or behind-camera endpoints; `is_hand` lets the renderer draw hands thinner.
 
-    `person_brightness_falloff` mixes each per-person limb color toward white
-    by `1 - falloff^k` for track index `k` (track 0 stays vivid). Matches the
-    mesh rasterizer and GLB exporters."""
+    `person_brightness_falloff` mixes each per-person color toward white by
+    `1 - falloff^k` for track k (track 0 stays vivid)."""
     starts: List[np.ndarray] = []
     ends: List[np.ndarray] = []
     colors: List[np.ndarray] = []
@@ -65,8 +60,7 @@ def _build_specs_from_pose(
         if body_op is None or cam_t is None:
             continue
         cam_t_np = np.asarray(cam_t, dtype=np.float32).reshape(3)
-        # op-keypoints are camera frame (Y-down); add cam_t to place the
-        # subject in front of the camera.
+        # op-keypoints are camera frame; add cam_t to place the subject in front.
         body_kp = body_op + cam_t_np[None, :]
 
         pastel = 0.0 if k == 0 else (1.0 - falloff ** k)
@@ -148,10 +142,9 @@ def _ray_capsule_t(
     ba_len: torch.Tensor,      # (M,) segment length
     radius: torch.Tensor,      # (M,) per-capsule radius
 ) -> torch.Tensor:
-    """Closed-form ray-capsule intersection. Returns (K, M) tensor of ray
-    parameters t to the nearest valid hit per capsule, +inf where the ray
-    misses. A capsule is the union of (cylinder body, hemisphere at A,
-    hemisphere at B); each component is a quadratic root-find."""
+    """Closed-form ray-capsule intersection -> (K, M) ray params t to the nearest
+    valid hit per capsule, +inf on miss. Capsule = union of (cylinder, hemisphere
+    at A, hemisphere at B), each a quadratic root-find."""
     INF = float("inf")
     r_sq = radius * radius                      # (M,)
 
@@ -238,9 +231,8 @@ def _render_capsules_torch(
     z_min = float(min(starts[:, 2].min().item(), ends[:, 2].min().item()))
     z_near = max(0.05, z_min - float(radius.max().item()))
 
-    # Union of per-capsule screen-space bboxes. Pixels outside this mask
-    # provably can't hit any capsule, so the analytic intersection only runs
-    # on the relevant subset of the canvas (~5-15% at 1080p for typical poses).
+    # Union of per-capsule screen-space bboxes — pixels outside can't hit any
+    # capsule, so intersection only runs on the relevant subset of the canvas.
     sz = starts[:, 2].clamp(min=z_near)
     ez = ends[:, 2].clamp(min=z_near)
     sx_p = starts[:, 0] * fx / sz + cx
@@ -261,16 +253,13 @@ def _render_capsules_torch(
         if xmax_i > xmin_i and ymax_i > ymin_i:
             coarse_mask[ymin_i:ymax_i, xmin_i:xmax_i] = True
 
-    # Analytic ray-capsule intersection. One pass over the masked pixels —
-    # the previous SDF marcher took up to MAX_STEPS=96 iterations per pixel
-    # plus 6 SDF evaluations per hit pixel for finite-difference normals.
+    # Analytic ray-capsule intersection, one pass over the masked pixels.
     INF = float("inf")
     flat_t = torch.full((N,), INF, device=device, dtype=torch.float32)
     flat_m_idx = torch.full((N,), -1, device=device, dtype=torch.long)
     active_idx = torch.nonzero(coarse_mask.view(-1), as_tuple=False).squeeze(1)
     if active_idx.numel() > 0:
-        # Cap per-chunk (K, M) tensors to ~4M elements to keep peak memory
-        # manageable when both K (image pixels) and M (capsules) are large.
+        # Cap per-chunk (K, M) tensors to ~4M elements to bound peak memory.
         chunk_max = max(1, int(4_000_000 / max(M, 1)))
         for i0 in range(0, active_idx.numel(), chunk_max):
             sub = active_idx[i0 : i0 + chunk_max]
@@ -284,7 +273,7 @@ def _render_capsules_torch(
                 flat_t[winners] = t_min[hit]
                 flat_m_idx[winners] = m_idx[hit]
 
-    # Shade: analytic normal (P - closest_point_on_segment) → soft Lambert × depth fade.
+    # Shade via analytic normal (P - closest point on segment).
     out = torch.zeros((N, 3), dtype=torch.float32, device=device)
     if background_rgb is not None:
         out = background_rgb.to(device=device, dtype=torch.float32).reshape(N, 3).clone()
@@ -306,10 +295,10 @@ def _render_capsules_torch(
 
         col = colors[m_h, :3]
         if flat_shade:
-            # Solid per-limb color (OpenPose look) — no lighting/depth modulation.
+            # Solid per-limb color (OpenPose look) — no lighting/depth.
             out[hit_idx] = col
             return out.view(H, W, 3).clamp(0.0, 1.0)
-        # SCAIL Blinn-Phong (render_torch.py:290-331). Headlight: light = +Z.
+        # SCAIL Blinn-Phong, headlight along +Z.
         diff = torch.clamp(-(normals[:, 2]), min=0.0)
         diffuse = 0.45 + 0.55 * diff
 
@@ -319,7 +308,7 @@ def _render_capsules_torch(
         half_dir = half_dir / half_dir.norm(dim=-1, keepdim=True).clamp(min=1e-8)
         spec = torch.clamp((normals * half_dir).sum(dim=-1), min=0.0).pow(32)
 
-        # Mild depth fade matches SCAIL's mm-scale ramp in our meter units.
+        # Mild depth fade.
         z_vals = p_hit[:, 2]
         z_lo, z_hi = float(z_vals.min().item()), float(z_vals.max().item())
         if z_hi - z_lo > 1e-6:
@@ -351,21 +340,18 @@ def render_pose_data_capsules(
     hand_radius_scale: float = 0.4,
     device: Optional[torch.device] = None,
 ) -> torch.Tensor:
-    """Render a frame's pose_data as 3D capsules projected through the per-
-    person camera. Returns (H, W, 3) fp32 in [0, 1].
+    """Render a frame's pose_data as 3D capsules through the per-person camera.
+    Returns (H, W, 3) fp32 in [0, 1].
 
-    `composite='over'` paints over `background` (black if None);
-    `composite='mesh_only'` always uses a black canvas.
-
-    `radius_m` is in METERS (matching `pred_keypoints_3d` / `pred_cam_t`).
-    Hand limbs use `radius_m * hand_radius_scale` (their bones are far shorter
-    than body limbs). Camera fx/fy come from each person's `focal_length`.
+    `composite='over'` paints over `background` (black if None); 'mesh_only'
+    uses a black canvas. `radius_m` is in meters; hand limbs use
+    `radius_m * hand_radius_scale`. fx/fy come from each person's `focal_length`.
     """
     persons = pose_data["frames"][frame_idx]
     if device is None:
         device = comfy.model_management.get_torch_device()
 
-    # SAM3DBody shares one camera across the clip — pick from the first valid person.
+    # SAM3DBody shares one camera across the clip — use the first valid person.
     fx = fy = float(min(H, W))
     for person in persons:
         f = person.get("focal_length")
diff --git a/comfy_extras/sam3d_body/export/glb_openpose.py b/comfy_extras/sam3d_body/export/glb_openpose.py
index 666aab69e..38a651399 100644
--- a/comfy_extras/sam3d_body/export/glb_openpose.py
+++ b/comfy_extras/sam3d_body/export/glb_openpose.py
@@ -1,16 +1,10 @@
 """GLB export — OpenPose 18-keypoint visualization mode.
 
-Independent of the MHR rig — sourced from pose_data's `pred_keypoints_3d`
-(the model's regressed surface keypoints). Each track becomes an armature
-with a sibling joint per keypoint; sphere markers + stick/capsule limbs are
-skinned to those joints.
-
-Optional hand keypoints (also from `pred_keypoints_3d`, indices 21..62) and
-face landmarks (sampled from `pred_vertices` at fixed head-mesh vertex IDs)
-extend the same armature.
-
-OpenPose-shared tables / palettes / mappings live in `glb_shared.py` and are
-imported below — they're also used by the 2D and 3D renderers in this package.
+Sourced from pose_data's `pred_keypoints_3d`, independent of the MHR rig. Each
+track becomes an armature with a joint per keypoint; sphere markers and limbs
+are skinned to those joints. Optional hands (`pred_keypoints_3d` 21..62) and
+face landmarks (`pred_vertices` at fixed vertex IDs) extend the same armature.
+Shared tables/palettes/mappings live in `glb_shared.py`.
 """
 
 from __future__ import annotations
@@ -55,9 +49,8 @@ def _finalize_skinned_mesh(
     joints: np.ndarray, weights: np.ndarray, vert_colors: np.ndarray,
     smooth_shade: bool,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """Apply smooth or flat shading to an indexed sphere/stick group mesh and
-    pack per-vertex colors. Smooth keeps the indexed mesh + per-vertex colors;
-    flat duplicates verts per face and gathers face-corner colors."""
+    """Shade a skinned group mesh and pack per-vertex colors. Smooth keeps the
+    indexed mesh; flat duplicates verts per face and gathers face-corner colors."""
     if smooth_shade:
         v_f, n_f, f_f, j_f, w_f = smooth_shade_mesh(verts, faces, joints, weights)
         return v_f, n_f, f_f, j_f, w_f, vert_colors.astype(np.float32)
@@ -73,10 +66,8 @@ def _finalize_skinned_mesh(
 def _pair_colors_from_kp(
     pairs: Tuple[Tuple[int, int], ...], kp_colors: np.ndarray, endpoint: int = 1,
 ) -> np.ndarray:
-    """Per-limb color = endpoint-vertex color from `kp_colors`. Default
-    `endpoint=1` picks the second (distal) vertex of each pair, which is
-    the OpenPose-canonical per-finger gradient when fingers go base→tip
-    (wrist=0 → thumb1=1 → thumb2=2 …)."""
+    """Per-limb color from `kp_colors`. `endpoint=1` (default) picks the distal
+    vertex of each pair — the OpenPose per-finger gradient for base→tip fingers."""
     n = len(pairs)
     out = np.zeros((n, 3), dtype=np.float32)
     for i, (a, b) in enumerate(pairs):
@@ -88,19 +79,13 @@ def _openpose_bind_at_rig_rest(
     pose_data: Dict[str, Any], *,
     include_hands: bool, face_vert_ids: Optional[np.ndarray],
 ) -> Optional[np.ndarray]:
-    """OpenPose keypoint positions at the rig's REST pose (T-pose at authoring
-    origin), built from the `_skeleton_override`'s `bind_global_m` (joint rest
-    TRS) and `rest_verts_m` (mesh rest verts for face landmarks).
+    """OpenPose keypoint positions at the rig's REST pose, from the override's
+    `bind_global_m` (joint rest TRS) and `rest_verts_m` (face landmarks).
 
-    Used as the static-bind for openpose-mode geometry so the GLB's static
-    POSITION attribute sits at rig origin — matching skeletal mode's bind and
-    producing the same 'snap from rest to scene-frame-0' transition at the
-    start of playback. Without this, the static geometry is at scene-frame-0
-    (kp_seq[0]) and viewers that auto-fit on static POSITION will center on
-    the scene location, hiding the per-frame motion.
-
-    Returns None when the override is missing or doesn't carry all the needed
-    mappings — caller falls back to per-frame extraction (kp_seq[0])."""
+    Used as the static-bind so the GLB's static POSITION sits at rig origin,
+    matching skeletal mode and producing the same rest→scene-frame-0 transition.
+    Returns None when the override lacks the needed mappings — caller then falls
+    back to per-frame extraction (kp_seq[0])."""
     override = pose_data.get("_skeleton_override") if isinstance(pose_data, dict) else None
     if override is None or "bind_global_m" not in override:
         return None
@@ -141,19 +126,12 @@ def _openpose_bind_at_rig_rest(
 def _extract_openpose_keypoints(
     pose_data: Dict[str, Any], frame_indices: List[int], person_k: int,
 ) -> np.ndarray:
-    """(N, 18, 3) OpenPose keypoint positions in rig-native Y-up metres.
+    """(N, 18, 3) OpenPose keypoints in rig-native Y-up metres.
 
-    Two sources, in priority order:
-
-    1. **External-skeleton path** — when pose_data has `_skeleton_override`
-       with `openpose18_joint_indices` ((18, 2) int32, see
-       `_resolve_openpose_keypoints_from_joints`), synthesize from each
-       person's `pred_joint_coords` directly. The override frame is already
-       rig-native Y-up, so no axis flip.
-    2. **MHR70 path** (default for SAM3DBody_Predict output) — re-index the
-       first 70 of 308 MHR keypoints (`pred_keypoints_3d`) to COCO-18.
-       Stored y-down (post `j3d[..., [1,2]] *= -1` in sam3d_body), so we
-       un-flip y/z to match rig-native Y-up.
+    External-skeleton path: when the override carries `openpose18_joint_indices`
+    ((18, 2) int32), synthesize from each person's `pred_joint_coords` (already
+    Y-up, no flip). MHR70 path (default): re-index `pred_keypoints_3d` to COCO-18
+    and un-flip y/z (stored y-down by sam3d_body).
     """
     frames = pose_data["frames"]
     N = len(frame_indices)
@@ -195,10 +173,8 @@ def _extract_openpose_keypoints(
     for t_idx, t in enumerate(frame_indices):
         person = frames[t][person_k]
         if "pred_keypoints_3d" not in person:
-            # Diagnose the source: external-skeleton producers ship
-            # `_skeleton_override` instead of MHR70 keypoints. If the
-            # producer didn't populate `openpose18_joint_indices` either,
-            # we can't synthesize the 18-keypoint set.
+            # External-skeleton producer without `openpose18_joint_indices`:
+            # can't synthesize the 18-keypoint set.
             if override is not None:
                 raise ValueError(
                     "build_glb_openpose: this pose_data carries "
@@ -229,15 +205,11 @@ def _extract_openpose_keypoints(
 def _extract_openpose_hand_keypoints(
     pose_data: Dict[str, Any], frame_indices: List[int], person_k: int,
 ) -> np.ndarray:
-    """(N, 42, 3) right+left OpenPose hand keypoints (21 + 21) in rig-native
-    Y-up frame.
+    """(N, 42, 3) right+left OpenPose hand keypoints (21+21) in rig-native Y-up.
 
-    External-skeleton path: requires `openpose_hand21_r_joint_indices` AND
-    `openpose_hand21_l_joint_indices` ((21, 2) int32 each) in the override.
-    Resolved against per-frame `pred_joint_coords` like the body path.
-
-    MHR70 path: re-orders `pred_keypoints_3d` indices 21..62 to OpenPose-21
-    (wrist + 5 fingers, thumb→pinky, base→tip)."""
+    External-skeleton path: needs `openpose_hand21_{r,l}_joint_indices` ((21, 2)
+    int32) in the override, resolved against `pred_joint_coords`. MHR70 path:
+    re-orders `pred_keypoints_3d` 21..62 to OpenPose-21 (wrist + 5 fingers)."""
     frames = pose_data["frames"]
     N = len(frame_indices)
     out = np.zeros((N, 42, 3), dtype=np.float32)
@@ -307,10 +279,8 @@ def _extract_face_landmarks_from_verts(
     pose_data: Dict[str, Any], frame_indices: List[int], person_k: int,
     vert_ids: np.ndarray,
 ) -> np.ndarray:
-    """(N, K_face, 3) face landmarks sampled from per-frame `pred_vertices`
-    at the supplied head-mesh vertex IDs, unflipped to MHR-native Y-up.
-    Each landmark inherits per-frame shape/expr/pose deformation for free
-    since `pred_vertices` already has it baked in."""
+    """(N, K_face, 3) face landmarks sampled from `pred_vertices` at the given
+    vertex IDs, unflipped to Y-up. Per-frame deformation is already baked in."""
     frames = pose_data["frames"]
     N = len(frame_indices)
     K = int(vert_ids.shape[0])
@@ -335,18 +305,11 @@ def _build_openpose_spheres(
     smooth_shade: bool = False,
     joint_indices: Optional[np.ndarray] = None,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """UV sphere per OpenPose keypoint, rigidly skinned to that keypoint's
-    joint, vertex-colored from kp_colors. `base_joint_idx` is added to the
-    emitted JOINTS_0 indices so callers can place this group at any offset
-    in the shared skin (body=0, right hand=18, etc.). `joint_indices` (when
-    given) overrides that with explicit per-sphere joint indices, so callers
-    can skip keypoints (e.g. SCAIL head dots).
-
-    `smooth_shade=True` keeps the indexed mesh and writes per-vertex
-    normals via face-normal averaging — round shading on the spheres.
-    `smooth_shade=False` (default) flat-shades by duplicating verts per
-    face, matching the existing OpenPose-mode look. Returns
-    (verts, normals, faces, joints4, weights4, vert_colors)."""
+    """UV sphere per keypoint, rigidly skinned to that keypoint's joint and
+    vertex-colored from kp_colors. `base_joint_idx` offsets the emitted JOINTS_0
+    indices (body=0, right hand=18, …); `joint_indices`, if given, sets explicit
+    per-sphere indices so callers can skip keypoints (e.g. SCAIL head dots).
+    Returns (verts, normals, faces, joints4, weights4, vert_colors)."""
     sv, sf = uv_sphere_unit()
     K = bind_kp_m.shape[0]
     Nv = sv.shape[0]
@@ -376,43 +339,23 @@ def _capsule_mesh_local(
     end_width_frac: float = 0.3,
     shape: str = "ellipsoid",
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray]:
-    """Build a per-limb mesh in limb-local frame along +Y from y=0 (head
-    pole) to y=L (tail pole).
+    """Per-limb mesh in limb-local frame along +Y from y=0 (head) to y=L (tail).
 
-    `shape` selects the silhouette:
-      - 'ellipsoid' (default): tips are small hemispheres of radius
-        `W * end_width_frac`; body has ellipsoidal radius profile
-        sin(π*u) from w_end at the junctions to W at the middle. Gives
-        a fat-middle / narrow-end stretched-ellipse look.
-      - 'capsule': SCAIL-style "rig" limb — an OPEN cylinder of constant
-        radius W with no hemisphere caps. Pair with sphere joint markers
-        of the same radius so the spheres seamlessly cap the open
-        cylinder ends (the cylinder cross-section ring at the endpoint
-        lies exactly on the sphere surface). Drawing hemisphere caps
-        inside the joint sphere creates a visible bump where the cap
-        pokes out unevenly when sphere radius ≠ cap radius — open
-        cylinders avoid that.
+    `shape`:
+      - 'ellipsoid' (default): hemisphere tips of radius `W * end_width_frac`,
+        ellipsoidal sin(π·u) body profile (fat middle, narrow ends).
+      - 'capsule': SCAIL "rig" limb — an OPEN cylinder of constant radius W,
+        no caps. Pair with same-radius sphere markers so they cap the ends
+        seamlessly (caps would bump out when sphere radius ≠ cap radius).
 
-    Per-limb mesh is required because the cap height (w_end) depends on
-    the limb width — a single canonical mesh can't produce true
-    hemispheres for arbitrary L:W ratios in ellipsoid mode.
+    A per-limb mesh is needed because cap height depends on width — one
+    canonical mesh can't give true hemispheres for arbitrary L:W in ellipsoid.
 
-    Returns:
-        verts: (Nv, 3) float32 — limb-local positions in meters.
-        faces: (Nf, 3) uint32 — triangle indices.
-        weights: (Nv, 2) float32 — (head, tail) skinning weights, linearly
-            interpolated by axial position (sums to 1).
+    Returns (verts (Nv,3), faces (Nf,3), weights (Nv,2) head/tail, sums to 1).
     """
     W = max(1e-6, min(float(W), float(L) * 0.5 - 1e-6))
     if str(shape) == "capsule":
-        # SCAIL-style "rig" limb: an OPEN cylinder of constant radius W,
-        # no hemisphere caps. The sphere joint markers at each endpoint
-        # provide the rounded ends of the bone — when sphere_radius ==
-        # cylinder_radius, the cylinder cross-section ring at the bone
-        # endpoint lies exactly on the sphere surface, so silhouette is
-        # seamless. Hemisphere caps would create a visible bump where
-        # the cap pokes out of the sphere if cap_r ≠ marker_r, so we
-        # omit them entirely.
+        # Open cylinder, no caps — sphere markers cap the ends (see docstring).
         cap_r = 0.0
         body_r = W
         if n_cap_lat is None:
@@ -425,7 +368,7 @@ def _capsule_mesh_local(
         end_frac = float(min(0.95, max(0.05, end_width_frac)))
         cap_r = max(1e-7, W * end_frac)
         body_r = W
-        # Ellipsoid defaults: more body rings to sample the sin(π·u) curve.
+        # More body rings to sample the sin(π·u) curve.
         if n_cap_lat is None:
             n_cap_lat = 3
         if n_body is None:
@@ -473,10 +416,7 @@ def _capsule_mesh_local(
             phi = 2.0 * np.pi * k / n_lon
             verts.append([body_r * float(np.cos(phi)), 0.0, body_r * float(np.sin(phi))])
 
-    # Body intermediate rings (between the cap junctions for capped meshes,
-    # between the two end rings for open cylinders). For 'capsule' mode
-    # n_body=0 by default — no intermediate rings needed for a constant-
-    # radius cylinder.
+    # Body intermediate rings (none for 'capsule', n_body=0 by default).
     body_rings: List[int] = []
     is_ellipsoid = str(shape) == "ellipsoid"
     for j in range(1, n_body + 1):
@@ -572,11 +512,8 @@ def _scail_redirect_neck_stub(body_kp: np.ndarray) -> np.ndarray:
 def _openpose_limb_rest_trs(
     bind_kp_m: np.ndarray, pairs: Tuple[Tuple[int, int], ...],
 ) -> Tuple[np.ndarray, np.ndarray]:
-    """Per-limb rest TRS:
-        midpoints (K_pairs, 3): rest midpoint between bind_kp_m[a] and bind_kp_m[b].
-        rest_axes (K_pairs, 3): unit direction a→b at rest (or +Y if degenerate).
-    Caller uses `midpoints` as each limb joint's rest translation (rotation =
-    identity), and `rest_axes` to compute per-frame alignment rotations."""
+    """Per-limb rest TRS: midpoints (K_pairs, 3) and unit a→b axes (or +Y if
+    degenerate). Caller uses midpoints as rest translation, axes for alignment."""
     K_pairs = len(pairs)
     mid = np.zeros((K_pairs, 3), dtype=np.float32)
     axis = np.zeros((K_pairs, 3), dtype=np.float32)
@@ -595,13 +532,10 @@ def _openpose_limb_rest_trs(
 def _openpose_limb_anim_trs(
     kp_seq: np.ndarray, pairs: Tuple[Tuple[int, int], ...], rest_axes: np.ndarray,
 ) -> Tuple[np.ndarray, np.ndarray]:
-    """Per-frame limb TRS:
-        anim_mid  (N, K_pairs, 3): midpoint of (kp_seq[t][a], kp_seq[t][b]).
-        anim_quat (N, K_pairs, 4): rotation (xyzw) that aligns each limb's rest
-                                   axis to its frame-t axis.
-    Together with rest TRS, this drives `skin_matrix(t) = T(mid_t) * R_t *
-    T(-mid_rest)` so each capsule rigidly rotates about its rest midpoint to
-    track the limb's current direction — no LBS cross-section thinning."""
+    """Per-frame limb TRS: anim_mid (N, K_pairs, 3) midpoints and anim_quat
+    (N, K_pairs, 4 xyzw) aligning each limb's rest axis to its frame-t axis.
+    Drives skin_matrix(t) = T(mid_t)·R_t·T(-mid_rest) — rigid rotation about
+    the rest midpoint, no LBS cross-section thinning."""
     N = kp_seq.shape[0]
     K_pairs = len(pairs)
     anim_mid = np.zeros((N, K_pairs, 3), dtype=np.float32)
@@ -616,7 +550,7 @@ def _openpose_limb_anim_trs(
             n = float(np.linalg.norm(d))
             if n > 1e-9:
                 R[t, k] = rotation_align(ax_rest, d / n)
-    quat = rotmat_to_quat_np(R).astype(np.float32)  # (N, K_pairs, 4) xyzw
+    quat = rotmat_to_quat_np(R).astype(np.float32)
     return anim_mid, quat
 
 
@@ -628,20 +562,14 @@ def _build_openpose_sticks(
     smooth_shade: bool = False,
     end_width_frac: float = 0.3,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """Capsule (cylinder + hemispherical caps) per limb pair (a, b).
+    """Capsule per limb pair (a, b), each sized to its own length/width so caps
+    are true hemispheres regardless of L:W. Ellipsoid mode auto-clamps width to
+    `length * 0.1` so short limbs don't look chunky.
 
-    Each limb gets its own mesh sized to that limb's length and width so
-    the caps are TRUE hemispheres of radius `half_width_eff` — the limb
-    silhouette is rounded-rectangle-like, regardless of L:W ratio. Width
-    auto-clamped to `length * 0.1` so short limbs (face/ear) don't look
-    chunky next to long ones.
-
-    Skinning: rigid (weight=1) binding to a per-limb joint at
-    `limb_joint_base_idx + limb_idx` — the caller animates that joint with
-    midpoint translation + rest-to-current rotation so each capsule rotates
-    rigidly with its limb (avoids translation-only LBS cross-section
-    thinning). Returns flat-shaded (verts, normals, faces, joints4,
-    weights4, vert_colors)."""
+    Rigid (weight=1) binding to a per-limb joint at `limb_joint_base_idx +
+    limb_idx`, which the caller animates with midpoint translation + rotation
+    (avoids LBS thinning). Returns (verts, normals, faces, joints4, weights4,
+    vert_colors)."""
     canonical = np.array([0.0, 1.0, 0.0], dtype=np.float32)
 
     out_v_chunks: List[np.ndarray] = []
@@ -663,13 +591,10 @@ def _build_openpose_sticks(
         unit_dir = direction / length
         R = rotation_align(canonical, unit_dir)
         if is_capsule:
-            # SCAIL-style uniform radius — every bone gets the same width.
-            # `_capsule_mesh_local` clamps internally to L/2-eps so very
-            # short bones don't go degenerate.
+            # Uniform radius — every bone the same width (clamped internally).
             half_width_eff = max(MIN_WIDTH, half_width_m)
         else:
-            # Ellipsoid mode: original auto-thinning so short face/ear
-            # limbs don't look chunky next to long body limbs.
+            # Auto-thin so short face/ear limbs aren't chunky next to body limbs.
             half_width_eff = max(MIN_WIDTH, min(length * WIDTH_RATIO, half_width_m))
 
         v_local, f_local, _weights_unused = _capsule_mesh_local(
@@ -678,10 +603,8 @@ def _build_openpose_sticks(
         v_world = v_local @ R.T + head
         Nv = v_local.shape[0]
 
-        # Rigid binding to the per-limb joint. The 2-bone (head, tail) weights
-        # from `_capsule_mesh_local` are discarded — they're translation-only
-        # under glTF LBS and don't rotate the cross-section, causing visible
-        # thinning when the limb axis changes between rest and animated pose.
+        # Rigid binding to the per-limb joint; the 2-bone weights are discarded
+        # (translation-only under LBS, would thin the cross-section).
         j_arr = np.zeros((Nv, 4), dtype=np.uint16)
         j_arr[:, 0] = limb_idx + limb_joint_base_idx
         w_arr = np.zeros((Nv, 4), dtype=np.float32)
@@ -730,40 +653,24 @@ def build_glb_openpose(
     stick_end_width_frac: float = 0.6,
     bone_smooth_window: int = 0,
 ) -> bytes:
-    """Build a GLB containing an OpenPose-style 3D skeleton — sphere markers
-    per keypoint plus rainbow-colored sticks between standard limb pairs.
-    Body keypoints are sourced from pose_data's `pred_keypoints_3d` (no rig
-    forward needed). Optional hand keypoints (also from `pred_keypoints_3d`)
-    and face landmarks (sampled from `pred_vertices` at fixed head-mesh
-    vertex IDs) extend the same per-track armature.
+    """Build a GLB of an OpenPose-style 3D skeleton — sphere markers per keypoint
+    plus colored sticks between limb pairs, one armature per track. Body from
+    `pred_keypoints_3d`; optional hands (same source) and face landmarks
+    (`pred_vertices`) extend each armature.
 
     Args:
-        include_hands: append the standard 21+21 OpenPose hand keypoints to
-            each track's armature (right hand at MHR70 indices 21..41,
-            left at 42..62).
-        hand_marker_radius_m: per-hand sphere radius. 0 = auto = 0.4 ×
-            `marker_radius_m` (hand keypoints are anatomically smaller than
-            body joints; matches DWPose's smaller hand dots).
-        hand_stick_radius_m: per-hand limb half-width. 0 = auto = 0.5 ×
-            `stick_radius_m`.
-        hand_color_style: 'dwpose' (default) = solid-blue hand dots,
-            rainbow per-finger sticks (controlnet_aux/dwpose convention);
-            'openpose' = rainbow per-finger dots AND sticks (matches
-            poseParameters.cpp::HAND_COLORS_RENDER).
-        face_style: 'disabled' (default) | 'full' | 'eyes_mouth' — face
-            landmarks sampled from `pred_vertices` at vertex IDs picked from
-            `pose_data["canonical_colors"]["positions"]`. 'full' = all ~30
-            contour points; 'eyes_mouth' = the eyes + outer-lip subset.
-        face_marker_radius_m: per-face landmark sphere radius. 0 = auto =
-            0.3 × `marker_radius_m` — face landmarks are densely packed
-            around the eyes/mouth/jaw and need to be much smaller than
-            body keypoints to keep the layout legible. Face landmarks are
-            rendered as standalone dots (no contour lines), matching
-            DWPose's face_pose draw style.
-        palette: body color scheme. 'openpose' = standard rainbow gradient
-            per keypoint (canonical OpenPose convention); 'scail' =
-            SCAIL-Pose style — warm hues right side, cool hues left side,
-            grey neck-to-nose centerline, distinct per-limb colors.
+        include_hands: append the 21+21 OpenPose hand keypoints per track.
+        hand_marker_radius_m: hand sphere radius. 0 = auto = 0.4 × marker_radius_m.
+        hand_stick_radius_m: hand limb half-width. 0 = auto = 0.5 × stick_radius_m.
+        hand_color_style: 'dwpose' (default) = solid-blue dots + rainbow sticks;
+            'openpose' = rainbow dots AND sticks.
+        face_style: 'disabled' (default) | 'full' (~30 contour pts) | 'eyes_mouth'
+            (eyes + outer-lip subset); sampled at vertex IDs from
+            `canonical_colors["positions"]`.
+        face_marker_radius_m: face landmark sphere radius. 0 = auto = 0.3 ×
+            marker_radius_m. Rendered as dots only, no contour lines.
+        palette: 'openpose' = rainbow gradient per keypoint; 'scail' = warm right
+            / cool left, grey centerline, distinct per-limb colors.
     """
     is_scail = str(palette) == "scail"
     # SCAIL drops the face bones (13..16) and eye/ear spheres; keeps nose (idx 0,
@@ -771,13 +678,11 @@ def build_glb_openpose(
     body_pairs = OPENPOSE_18_PAIRS[:13] if is_scail else OPENPOSE_18_PAIRS
     body_sphere_kp = (np.arange(14, dtype=np.int64)
                       if is_scail else np.arange(18, dtype=np.int64))
-    if str(palette) == "scail":
+    if is_scail:
         body_sphere_colors = SCAIL_KEYPOINT_COLORS_18
         body_stick_colors = SCAIL_LIMB_COLORS_17
     elif str(palette) == "openpose":
-        # Existing OpenPose behavior: same rainbow array used for both
-        # spheres (per-keypoint) and sticks (per-limb, indexed 0..16 of
-        # the 18-element rainbow — yields a legible per-limb gradient).
+        # Same rainbow array drives both spheres and sticks.
         body_sphere_colors = OPENPOSE_RAINBOW_18
         body_stick_colors = OPENPOSE_RAINBOW_18
     else:
@@ -892,13 +797,9 @@ def build_glb_openpose(
         if bone_smooth_window and bone_smooth_window > 1:
             kp_seq = gaussian_smooth_positions(kp_seq, int(bone_smooth_window))
 
-        # Static-bind = rig's REST pose when available (override path); else
-        # fall back to frame 0 of the motion. The rest-pose bind makes the
-        # GLB's static POSITION attribute sit at rig origin, so viewers
-        # auto-fit/center on rig origin and the animation visibly snaps from
-        # rest to scene-frame-0 — matching skeletal mode's behavior. Without
-        # this, openpose's static geometry is at scene-frame-0 and viewers
-        # mis-center on the scene location, masking the motion entirely.
+        # Static-bind = rig REST pose when available, else frame 0. The rest
+        # bind keeps static POSITION at rig origin so viewers auto-center there
+        # and the motion is visible (see _openpose_bind_at_rig_rest).
         bind_kp_m_rest = _openpose_bind_at_rig_rest(
             pose_data, include_hands=include_hands, face_vert_ids=face_vert_ids,
         )
@@ -914,7 +815,7 @@ def build_glb_openpose(
         person_root_idx = len(nodes) - 1
         scene_root_indices.append(person_root_idx)
 
-        # K keypoint joint nodes (spheres bind here, rigid translation only).
+        # K keypoint joint nodes (spheres bind here, translation only).
         joint_node_indices: List[int] = []
         for j in range(K):
             nodes.append({
@@ -926,9 +827,7 @@ def build_glb_openpose(
             joint_node_indices.append(len(nodes) - 1)
         person_root["children"].extend(joint_node_indices)
 
-        # Per-limb REST TRS (midpoint + axis) and per-frame TRS (midpoint +
-        # quaternion that aligns rest-axis → frame-t-axis). Sticks bind
-        # rigidly to these joints so each capsule rotates with its limb.
+        # Per-limb rest + per-frame TRS; sticks bind rigidly to these joints.
         limb_rest_mids_list: List[np.ndarray] = []
         limb_rest_axes_list: List[np.ndarray] = []
         limb_anim_mids_list: List[np.ndarray] = []
@@ -951,12 +850,10 @@ def build_glb_openpose(
                 limb_rest_axes_list.append(raxis_h)
                 limb_anim_mids_list.append(amid_h)
                 limb_anim_quats_list.append(aquat_h)
-        limb_rest_mids = np.concatenate(limb_rest_mids_list, axis=0)         # (K_limbs, 3)
-        limb_anim_mids = np.concatenate(limb_anim_mids_list, axis=1)         # (N, K_limbs, 3)
-        limb_anim_quats = np.concatenate(limb_anim_quats_list, axis=1)       # (N, K_limbs, 4)
-        # Hemisphere-align consecutive quats per limb so LINEAR interpolation
-        # takes the short path (otherwise large per-frame rotations can flip
-        # signs and produce visible "twist back" artifacts mid-playback).
+        limb_rest_mids = np.concatenate(limb_rest_mids_list, axis=0)
+        limb_anim_mids = np.concatenate(limb_anim_mids_list, axis=1)
+        limb_anim_quats = np.concatenate(limb_anim_quats_list, axis=1)
+        # Hemisphere-align consecutive quats so LINEAR interp takes the short path.
         limb_anim_quats = quat_sign_fix_per_joint(limb_anim_quats).astype(np.float32)
 
         limb_joint_indices: List[int] = []
@@ -970,8 +867,8 @@ def build_glb_openpose(
             limb_joint_indices.append(len(nodes) - 1)
         person_root["children"].extend(limb_joint_indices)
 
-        # Combined skin: keypoint joints (IBM = T(-bind_kp_m)) then limb joints
-        # (IBM = T(-limb_rest_mid)). Both yield identity skin_matrix at rest.
+        # Combined skin: keypoint joints then limb joints; IBM = T(-rest) for
+        # both, yielding identity skin_matrix at rest.
         all_joint_indices = joint_node_indices + limb_joint_indices
         ibm = np.tile(np.eye(4, dtype=np.float32), (K + K_limbs, 1, 1))
         ibm[:K, :3, 3] = -bind_kp_m
@@ -985,10 +882,8 @@ def build_glb_openpose(
         })
         skin_idx = len(skins) - 1
 
-        # Per-group geometry. Spheres bind to keypoint joints (base_joint_idx
-        # ∈ [0, K)); sticks bind to limb joints (limb_joint_base_idx ∈
-        # [K, K + K_limbs)). Groups stack body → right hand → left hand →
-        # face for keypoint joints, and body → R-hand → L-hand for limbs.
+        # Per-group geometry. Spheres bind to keypoint joints [0, K); sticks to
+        # limb joints [K, K+K_limbs). Stacked body → R-hand → L-hand → face.
         group_meshes: List[Tuple[np.ndarray, np.ndarray, np.ndarray,
                                  np.ndarray, np.ndarray, np.ndarray]] = []
         sp = _build_openpose_spheres(
@@ -1008,9 +903,7 @@ def build_glb_openpose(
         group_meshes.append(st)
 
         if include_hands:
-            # Hand stick colors stay rainbow per-finger regardless of
-            # `hand_color_style` — only the sphere dots switch to solid
-            # blue under 'dwpose'. Matches controlnet_aux/dwpose/util.py.
+            # Hand sticks stay rainbow per-finger; only dots switch under 'dwpose'.
             hand_pair_colors = _pair_colors_from_kp(
                 OPENPOSE_HAND_PAIRS, OPENPOSE_HAND_COLORS_21, endpoint=1,
             )
@@ -1033,9 +926,7 @@ def build_glb_openpose(
         if K_face > 0:
             f_off = K_body + K_hands
             f_bind = bind_kp_m[f_off:f_off + K_face]
-            # DWPose face = dots only, no contour lines
-            # (controlnet_aux/dwpose/util.py::draw_facepose draws white
-            # circles per landmark and never connects them).
+            # DWPose face = dots only, no contour lines.
             group_meshes.append(_build_openpose_spheres(
                 f_bind, float(face_marker_radius_m),
                 FACE_LANDMARK_COLORS, base_joint_idx=f_off,
@@ -1087,9 +978,8 @@ def build_glb_openpose(
                 "target": {"node": joint_node_indices[j], "path": "translation"},
             })
 
-        # Per-limb-joint translation + rotation channels. Stationary limbs
-        # have their constant TRS baked into the node so they don't bloat the
-        # animation buffer.
+        # Per-limb-joint translation + rotation; stationary limbs bake their
+        # constant TRS into the node instead of an animation channel.
         for k in range(K_limbs):
             t_k = limb_anim_mids[:, k, :].astype(np.float32)
             if (np.ptp(t_k, axis=0) < 1e-6).all():
@@ -1103,9 +993,7 @@ def build_glb_openpose(
                     "target": {"node": limb_joint_indices[k], "path": "translation"},
                 })
             q_k = limb_anim_quats[:, k, :].astype(np.float32)
-            # ptp on the absolute value handles the +q == -q ambiguity, but
-            # `quat_sign_fix_per_joint` already aligned signs so a plain ptp
-            # is fine here.
+            # Plain ptp is fine — signs already aligned by quat_sign_fix_per_joint.
             if (np.ptp(q_k, axis=0) < 1e-6).all():
                 nodes[limb_joint_indices[k]]["rotation"] = q_k[0].tolist()
             else:
diff --git a/comfy_extras/sam3d_body/export/glb_shared.py b/comfy_extras/sam3d_body/export/glb_shared.py
index 0db4813a3..017ad20a5 100644
--- a/comfy_extras/sam3d_body/export/glb_shared.py
+++ b/comfy_extras/sam3d_body/export/glb_shared.py
@@ -1,15 +1,11 @@
-"""GLB export for SAM 3D Body pose_data.
+"""Shared GLB export helpers for SAM 3D Body pose_data.
 
-Mode: skeletal — rebuilds the MHR 127-bone rig. Per-frame local TRS comes from
-re-running param_transform on saved mhr_model_params; rest verts from a
-zero-pose forward with the person's shape_params; sparse triplet skinning is
-compacted to glTF's max-4-influences form; facial expression is re-exposed as
-72 morph targets driven by expr_params.
-
-pred_vertices/pred_cam_t are camera-y-down — un-flipped here so the GLB lives
-in glTF-spec Y-up. Pose correctives are dropped (glTF skinning can't represent
-them); deformation at extreme joint angles will differ from the SAM3DBody
-renderer by the corrective amount.
+Skeletal mode rebuilds the MHR 127-bone rig: per-frame local TRS from
+param_transform on mhr_model_params, rest verts from a zero-pose forward,
+sparse skinning compacted to glTF's 4-influence form, expression re-exposed as
+72 morph targets. Camera-y-down data is un-flipped to glTF Y-up. Pose
+correctives are dropped (glTF skinning can't represent them), so extreme joint
+angles differ from the SAM3DBody renderer by the corrective amount.
 """
 
 from __future__ import annotations
@@ -24,12 +20,11 @@ import torch
 
 from comfy_extras.sam3d_body.rasterizer import rainbow_colors_from_canonical
 
-# fp32-rounded ln(2). Used as `exp(x * _LN2)` to compute 2**x bit-identically
-# to the rig's own `torch.exp(jp[..., 6:7] * _LN2)`
+# fp32-rounded ln(2); exp(x * _LN2) matches the rig's own 2**x bit-for-bit.
 _LN2 = 0.6931471824645996
 
 
-# Quaternion / rotation helpers (xyzw convention, matching MHR rig)
+# Quaternion / rotation helpers (xyzw, matching MHR rig)
 
 def _euler_xyz_to_quat_np(angles: np.ndarray) -> np.ndarray:
     """(roll, pitch, yaw) -> (x, y, z, w). Mirrors mhr_rig._euler_xyz_to_quat."""
@@ -96,8 +91,7 @@ def _skel_state_compose_np(s1: np.ndarray, s2: np.ndarray) -> np.ndarray:
 
 
 def _gaussian_smooth_time(arr: np.ndarray, window: int) -> np.ndarray:
-    """Edge-replicate Gaussian smoothing along axis 0 (time); sigma = window/4.
-    Endpoints replicate so they aren't pulled toward zero. Returns float64."""
+    """Edge-replicate Gaussian smoothing along time (sigma = window/4). float64."""
     a = np.asarray(arr, dtype=np.float64)
     n = a.shape[0]
     half = window // 2
@@ -117,9 +111,8 @@ def _gaussian_smooth_time(arr: np.ndarray, window: int) -> np.ndarray:
 
 
 def gaussian_smooth_quats(q_seq: np.ndarray, window: int) -> np.ndarray:
-    """Gaussian-smooth a (N, NJ, 4) quaternion sequence along time. Sign-aligns
-    per joint first, convolves per-component, renormalizes. Suppresses multi-
-    frame bone spikes at extreme poses without needing the upstream Smooth node."""
+    """Smooth a (N, NJ, 4) quaternion sequence along time: sign-align per joint,
+    convolve per-component, renormalize. Calms bone spikes at extreme poses."""
     if window <= 1 or q_seq.shape[0] < 2:
         return q_seq
     out = _gaussian_smooth_time(quat_sign_fix_per_joint(q_seq), window)
@@ -128,18 +121,16 @@ def gaussian_smooth_quats(q_seq: np.ndarray, window: int) -> np.ndarray:
 
 
 def gaussian_smooth_positions(seq: np.ndarray, window: int) -> np.ndarray:
-    """Gaussian-smooth a (N, K, 3) position sequence along time (edge-replicate
-    padding). Used to calm jittery keypoint tracks before the openpose rig
-    derives sphere translations + limb TRS from them."""
+    """Smooth a (N, K, 3) position sequence along time. Calms jittery keypoint
+    tracks before the openpose rig derives sphere translations + limb TRS."""
     if window <= 1 or seq.shape[0] < 2:
         return seq
     return _gaussian_smooth_time(seq, window).astype(np.float32)
 
 
 def quat_sign_fix_per_joint(q_seq: np.ndarray) -> np.ndarray:
-    """Walk (N, NJ, 4) along time, flip sign whenever consecutive frames sit
-    on opposite hemispheres. Eliminates long-path slerp glitches (mid-anim
-    cartwheel flip). fp64 to avoid drift; normalizes input defensively."""
+    """Walk (N, NJ, 4) along time, flipping sign when consecutive frames sit on
+    opposite hemispheres. Avoids long-path slerp glitches. fp64 internally."""
     out = np.array(q_seq, dtype=np.float64, copy=True)
     norms = np.linalg.norm(out, axis=-1, keepdims=True)
     out = out / np.maximum(norms, 1e-12)
@@ -151,11 +142,9 @@ def quat_sign_fix_per_joint(q_seq: np.ndarray) -> np.ndarray:
 
 
 def bone_locals_from_globals(rig_global: np.ndarray, parents: np.ndarray) -> np.ndarray:
-    """Globals (N, NJ, 8) + parents -> per-bone local TRS (N, NJ, 8) such that
-    FK over (parents, bone_local) reproduces rig_global. local =
-    inverse(parent_global) ∘ child_global makes this robust to hierarchy-
-    convention mismatches: glTF FK gives back exactly rig_global even if
-    `parents` doesn't match the rig's pmi-walk."""
+    """Globals (N, NJ, 8) + parents -> per-bone local TRS so FK reproduces
+    rig_global. local = inverse(parent_global) ∘ child_global, robust to
+    hierarchy-convention mismatches in `parents`."""
     N, NJ, _ = rig_global.shape
     bone_local = np.zeros_like(rig_global)
     for j in range(NJ):
@@ -188,8 +177,7 @@ def _quat_to_mat3_np(q: np.ndarray) -> np.ndarray:
 
 def collect_tracks(pose_data: Dict[str, Any], track_index: int) -> List[Tuple[int, List[int]]]:
     """List of (person_index, frame_indices). track_index == -1 means every
-    present track; empty tracks are dropped. Same person index across frames
-    is assumed same subject (Smooth/Predict enforce this on tracked bboxes)."""
+    present track; empty tracks dropped. Same person index = same subject."""
     frames = pose_data["frames"]
     max_p = max((len(f) for f in frames), default=0)
     if max_p == 0:
@@ -257,8 +245,7 @@ class GLBWriter:
         return len(self.accessors) - 1
 
     def add_vec3_f32_no_minmax(self, arr: np.ndarray) -> int:
-        """Morph-target POSITIONs: spec lets us skip min/max, avoiding a
-        per-frame delta bbox."""
+        """Morph-target POSITIONs: spec lets us skip min/max."""
         a = np.ascontiguousarray(arr, dtype=np.float32)
         view_idx = self._add_view(a.tobytes(), target=_BYTE_ARRAY)
         self.accessors.append({
@@ -288,9 +275,8 @@ class GLBWriter:
         return len(self.accessors) - 1
 
     def add_scalar_f32_flat(self, arr: np.ndarray, count: int) -> int:
-        """Animation-output scalars: `count` is keyframes, not floats. Morph-
-        target weight tracks store N_morph weights per keyframe as flat float32
-        with count=N_keyframes."""
+        """Animation-output scalars: `count` is keyframes, not floats (morph
+        weight tracks store N_morph weights per keyframe)."""
         a = np.ascontiguousarray(arr, dtype=np.float32).reshape(-1)
         view_idx = self._add_view(a.tobytes())
         self.accessors.append({
@@ -382,9 +368,8 @@ def bake_vertex_colors(
     rainbow_tilt_z_deg: float,
     pastel_mix: float,
 ) -> Optional[np.ndarray]:
-    """Per-vertex RGB matching the renderer's shader preset, on the canonical
-    mesh. Returns (N_v, 3) float32 in [0, 1], or None for `default` (let the
-    viewer's default material handle shading)."""
+    """Per-vertex RGB matching the renderer's shader preset. Returns (N_v, 3)
+    float32 in [0, 1], or None for `default` (use the viewer's material)."""
     if shader == "default" or canonical_colors is None:
         return None
 
@@ -432,8 +417,8 @@ def compute_normals(verts: np.ndarray, faces: np.ndarray) -> np.ndarray:
 
 
 def _parents_from_pmi(rig: Any) -> np.ndarray:
-    """Parent index per joint from skel_pmi. pmi is (2, 266): row 0 = child,
-    row 1 = parent, split into BFS levels by skel_pmi_buffer_sizes. Roots = -1."""
+    """Parent index per joint from skel_pmi ((2, 266): row 0 child, row 1
+    parent, split into BFS levels by skel_pmi_buffer_sizes). Roots = -1."""
     NJ = int(rig.NUM_JOINTS)
     pmi = rig.skel_pmi.cpu().numpy()
     sizes = rig.skel_pmi_buffer_sizes.cpu().numpy().tolist()
@@ -450,47 +435,29 @@ def _parents_from_pmi(rig: Any) -> np.ndarray:
 
 def _get_skeleton_override(pose_data: Optional[Dict[str, Any]]) -> Optional[Dict[str, Any]]:
     """Return ``_skeleton_override`` dict if present. Non-MHR skeletons supply
-    this to bypass MHR rig extraction (see ComfyUI-Kimodo). Required keys:
-        parents:              (NJ,) int32, -1 = root
-        bind_global_m:        (NJ, 8) f32   — [t.xyz | q.xyzw | scale], meters
-        lbs_compact_joints:   (V, 8) uint16 — pre-compacted skin influences
-        lbs_compact_weights:  (V, 8) f32
-        lbs_compact_max_inf:  int           — actual max influences (≤ 8)
-        rest_verts_m:         (V, 3) f32
-        faces:                (F, 3) uint32
-    Optional:
-        per_frame_y_down:     bool — set False if pred_joint_coords are already
-                                     rig-native Y-up (kimodo). Default True (MHR).
-        openpose18_joint_indices:        (18, 2) int32 — body OpenPose-18 → joint
-                                         index pair, resolved against per-frame
-                                         `pred_joint_coords`. Each row is
-                                         (joint_a, joint_b); b == -1 = single
-                                         joint, else default midpoint of the two
-                                         (lets producers approximate keypoints
-                                         with no matching joint, e.g. Nose ≈
-                                         midpoint(LeftEye, RightEye)). Enables
-                                         `SAM3DBody_ToGLB(mode="openpose")` on
-                                         external rigs.
-        openpose18_joint_weights:        (18,) f32 — optional per-keypoint blend
-                                         weight for the (a, b) mapping above.
-                                         Position = w*joints[a] + (1-w)*joints[b]
-                                         when b ≥ 0 (default w=0.5 → midpoint).
-                                         Values outside [0, 1] EXTRAPOLATE past
-                                         the line segment — used to approximate
-                                         landmarks with no nearby joint pair
-                                         (e.g. ears: w=2.0 along the eye→eye
-                                         axis puts each ear one eye-distance
-                                         outside the corresponding eye). Ignored
-                                         for single-joint rows (b = -1).
-        openpose_hand21_r_joint_indices: (21, 2) int32 — right-hand OpenPose-21
-                                         (wrist + 5 fingers × 4 joints, base→tip)
-                                         → joint index pair. Required (alongside
-                                         the L counterpart) for openpose mode
-                                         with include_hands=True.
-        openpose_hand21_l_joint_indices: (21, 2) int32 — left-hand counterpart.
-        openpose_hand21_r_joint_weights: (21,) f32 — optional, same semantics as
-                                         `openpose18_joint_weights`.
-        openpose_hand21_l_joint_weights: (21,) f32 — optional, same as above.
+    this to bypass MHR rig extraction (see ComfyUI-Kimodo).
+
+    Required keys:
+        parents:             (NJ,) int32, -1 = root
+        bind_global_m:       (NJ, 8) f32 — [t.xyz | q.xyzw | scale], meters
+        lbs_compact_joints:  (V, 8) uint16 — pre-compacted skin influences
+        lbs_compact_weights: (V, 8) f32
+        lbs_compact_max_inf: int — actual max influences (≤ 8)
+        rest_verts_m:        (V, 3) f32
+        faces:               (F, 3) uint32
+
+    Optional (enable openpose mode on external rigs):
+        per_frame_y_down:    bool — False if pred_joint_coords are already Y-up
+                             (kimodo). Default True (MHR).
+        openpose18_joint_indices:        (18, 2) int32 — body keypoint → (a, b)
+                             joints, resolved against `pred_joint_coords`.
+                             b == -1 = single joint, else midpoint of (a, b).
+        openpose18_joint_weights:        (18,) f32 — blend w: w*a + (1-w)*b
+                             (default 0.5; outside [0,1] extrapolates; ignored
+                             when b == -1).
+        openpose_hand21_{r,l}_joint_indices: (21, 2) int32 — per-hand keypoint
+                             maps; both required for include_hands=True.
+        openpose_hand21_{r,l}_joint_weights: (21,) f32 — optional, same as above.
     """
     if pose_data is None:
         return None
@@ -502,12 +469,10 @@ def extract_rig_static(model: Any, pose_data: Optional[Dict[str, Any]] = None) -
     use that instead of MHR-specific `model.head_pose.mhr` buffers."""
     override = _get_skeleton_override(pose_data)
     if override is not None:
-        # External rig: caller pre-compacts skin and supplies bind global directly,
-        # so we don't need MHR's PCA pose / expression bases.
+        # External rig: skin pre-compacted, bind global supplied directly.
         parents = np.asarray(override["parents"], dtype=np.int32)
         rest_v = np.asarray(override["rest_verts_m"], dtype=np.float32)
-        # BVH needs parent-relative bone OFFSETs (cm). MHR ships these directly;
-        # external rigs only give bind globals, so derive locals from them.
+        # BVH needs parent-relative bone offsets (cm); derive from bind globals.
         bind_global_m = np.asarray(override["bind_global_m"], dtype=np.float32)
         local_bind = bone_locals_from_globals(bind_global_m[None], parents)[0]
         joint_translation_offsets = (local_bind[:, :3] * 100.0).astype(np.float32)
@@ -560,29 +525,26 @@ def compact_skin_to_n(
     skin_indices: np.ndarray, vert_indices: np.ndarray, weights: np.ndarray,
     num_verts: int, max_inf: int = 8,
 ) -> Tuple[np.ndarray, np.ndarray, int]:
-    """Sparse (joint, vert, weight) triplets -> dense (joints[V, max_inf],
-    weights[V, max_inf]). Keeps `max_inf` largest-magnitude influences,
-    renormalizes. `actual_max` lets the caller skip JOINTS_1/WEIGHTS_1 when
-    nothing exceeds 4 influences."""
+    """Sparse (joint, vert, weight) triplets -> dense (joints, weights) of shape
+    (V, max_inf), keeping the largest influences and renormalizing. `actual_max`
+    lets the caller skip JOINTS_1/WEIGHTS_1 when nothing exceeds 4 influences."""
     joints = np.zeros((num_verts, max_inf), dtype=np.uint16)
     out_w = np.zeros((num_verts, max_inf), dtype=np.float32)
     counts = np.zeros(num_verts, dtype=np.int32)
 
     if vert_indices.size:
-        # lexsort secondary key first: groups by vert, weights descending within group.
+        # Group by vert, weights descending within each group.
         order = np.lexsort((-weights, vert_indices))
         vi_sorted = vert_indices[order]
         sk_sorted = skin_indices[order]
         w_sorted = weights[order]
 
-        # Per-row rank within its vertex group: 0 at each group start, +1 elsewhere.
-        # group_start[i] is True when vi_sorted[i] starts a new vertex.
+        # Per-row rank within its vertex group (0 at each group start).
         n = vi_sorted.size
         group_start = np.empty(n, dtype=bool)
         group_start[0] = True
         np.not_equal(vi_sorted[1:], vi_sorted[:-1], out=group_start[1:])
         pos = np.arange(n, dtype=np.int64)
-        # Position of each row's group start, broadcast forward.
         group_start_pos = np.maximum.accumulate(np.where(group_start, pos, 0))
         rank = pos - group_start_pos
 
@@ -609,9 +571,8 @@ def zero_pose_rest_verts(
     model: Any, shape_params: np.ndarray, expr_zero: bool = True,
     pose_data: Optional[Dict[str, Any]] = None,
 ) -> np.ndarray:
-    """Rig with zero pose + this subject's shape -> rest verts (V, 3) in
-    rig-native Y-up meters. External-skeleton path returns `rest_verts_m`
-    directly (no PCA shape space to expand)."""
+    """Zero pose + this subject's shape -> rest verts (V, 3) in rig-native Y-up
+    meters. External path returns `rest_verts_m` directly."""
     override = _get_skeleton_override(pose_data)
     if override is not None:
         return np.asarray(override["rest_verts_m"], dtype=np.float32)
@@ -624,14 +585,11 @@ def zero_pose_rest_verts(
     sp = torch.from_numpy(np.ascontiguousarray(shape_params, dtype=np.float32)).to(device)
     if sp.ndim == 1:
         sp = sp.unsqueeze(0)
-    # mhr.forward(identity_coeffs, model_parameters, expr_coeffs):
-    # identity_rest = base_shape + identity_basis @ shape;
-    # cat([model_params, zeros]) through param_transform; expr added.
+    # rig.forward(shape, model_params, expr); zero pose + zero expr.
     model_params = torch.zeros(1, 204, device=device, dtype=dtype)
     expr = torch.zeros(1, 72, device=device, dtype=dtype)
     verts, _ = rig(sp.to(dtype), model_params, expr, apply_correctives=False)
-    # Rig outputs cm; mhr_head divides by 100 for meters. Match that.
-    verts_m = verts[0].cpu().float().numpy() / 100.0
+    verts_m = verts[0].cpu().float().numpy() / 100.0  # cm -> m
     return verts_m.astype(np.float32)
 
 
@@ -639,7 +597,7 @@ def global_skel_state_per_frame(
     model: Any, mhr_model_params: np.ndarray,
 ) -> np.ndarray:
     """Rig FK over a batch of mhr_model_params -> (N, NJ, 8) = (t cm, q xyzw,
-    scale). Bones are shape- and expression-independent so we pass zeros."""
+    scale). Bones are shape/expression-independent, so pass zeros."""
     inner = model.model if hasattr(model, "model") else model
     rig = inner.head_pose.mhr
     device = next(rig.parameters()).device
@@ -655,8 +613,8 @@ def global_skel_state_per_frame(
 
 
 def rotmat_to_quat_np(R: np.ndarray) -> np.ndarray:
-    """(..., 3, 3) -> (..., 4) xyzw. Shepperd 1978 branched, largest-component
-    pick for stability. Cross-frame sign-fixing is the caller's job."""
+    """(..., 3, 3) -> (..., 4) xyzw. Shepperd 1978, largest-component pick.
+    Cross-frame sign-fixing is the caller's job."""
     shape = R.shape[:-2]
     Rf = R.reshape(-1, 3, 3).astype(np.float64)
     M = Rf.shape[0]
@@ -703,14 +661,12 @@ def global_skel_state_from_pose_data(
     pose_data: Dict[str, Any], frame_indices: List[int], person_k: int,
     NJ: int, *, joint_coords_y_down: bool = True,
 ) -> np.ndarray:
-    """Build per-frame skel_state from stored pred_global_rots + pred_joint_coords,
-    bypassing rig.forward. Returns (N, NJ, 8) in METERS, MHR-native frame.
+    """Per-frame skel_state from stored pred_global_rots + pred_joint_coords,
+    bypassing rig.forward. Returns (N, NJ, 8) in meters, MHR-native frame.
 
-    pred_global_rots are MHR-native (no y/z flip). For MHR, pred_joint_coords
-    are stored y-down (post-flip), so un-flip when `joint_coords_y_down=True`.
-    External skeletons (Kimodo) store y-up already → pass False. Scale
-    defaults to 1 (rig scale isn't preserved in pose_data; close to 1 for
-    typical body poses)."""
+    pred_global_rots are MHR-native. pred_joint_coords are y-down for MHR
+    (un-flipped when `joint_coords_y_down=True`); external rigs store y-up
+    (pass False). Scale defaults to 1 (not preserved in pose_data)."""
     frames = pose_data["frames"]
     N = len(frame_indices)
     rotmat = np.zeros((N, NJ, 3, 3), dtype=np.float32)
@@ -731,10 +687,8 @@ def global_skel_state_from_pose_data(
 
 
 def bind_skel_state(model: Any, pose_data: Optional[Dict[str, Any]] = None) -> np.ndarray:
-    """Rig FK with all-zero params -> bind-pose global skel state (NJ, 8) in cm.
-    Inverse of `lbs_inverse_bind_pose` modulo precision; used as bones' static
-    TRS so the rest mesh looks correct with no animation playing. External
-    rig: convert override's `bind_global_m` from m → cm to match this contract."""
+    """Rig FK with all-zero params -> bind-pose global skel state (NJ, 8) in cm,
+    used as bones' static TRS. External rig: convert `bind_global_m` m -> cm."""
     override = _get_skeleton_override(pose_data)
     if override is not None:
         bind_m = np.asarray(override["bind_global_m"], dtype=np.float32).copy()
@@ -746,13 +700,10 @@ def bind_skel_state(model: Any, pose_data: Optional[Dict[str, Any]] = None) -> n
 
 @dataclass
 class Rig:
-    """Normalized static rig for the GLB/BVH exporters, independent of where it
-    came from: an MHR model (`Rig.from_pose_data(pose_data, model)`) or an inline
-    `pose_data["_skeleton_override"]` (external rigs, e.g. ComfyUI-Kimodo).
-
-    Consumers read these fields and never branch on the source. The only
-    source-dependent operation is `rest_verts_m` — MHR rest verts depend on the
-    subject's `shape_params`; external rigs ship fixed rest verts.
+    """Normalized static rig for the GLB/BVH exporters, source-independent: MHR
+    model or inline `pose_data["_skeleton_override"]` (external rigs). Consumers
+    never branch on the source. Only `rest_verts_m` is source-dependent — MHR
+    expands it from `shape_params`; external rigs ship it fixed.
     """
     parents: np.ndarray             # (NJ,) int32, -1 = root
     joint_offsets_cm: np.ndarray    # (NJ, 3) parent-relative bind offsets, cm
@@ -816,9 +767,8 @@ class Rig:
 
 
 def ibp_from_bind_global(bind_skel_state_m: np.ndarray) -> np.ndarray:
-    """Inverse-bind MAT4 by inverting the rig's bind global (meters). Guarantees
-    IBP[j] = inverse(FK over bind local TRS) — exactly what glTF skinning
-    needs given bones default to the bind local TRS. Returns (NJ, 4, 4)
+    """Inverse-bind MAT4 from the rig's bind global (meters). IBP[j] =
+    inverse(FK over bind local TRS), as glTF skinning needs. Returns (NJ, 4, 4)
     column-major."""
     NJ = bind_skel_state_m.shape[0]
     t = bind_skel_state_m[:, :3].astype(np.float32)
@@ -877,10 +827,8 @@ def _ibp_to_mat4(ibp_skel: np.ndarray) -> np.ndarray:
 
 
 def uv_sphere_unit(n_lat: int = 9, n_lon: int = 16) -> Tuple[np.ndarray, np.ndarray]:
-    """Unit UV sphere, poles ±Y. `n_lat` kept ODD by default so one ring
-    lands at the equator. Default (9, 16) gives 146 verts / 288 faces — n_lon
-    matches the 16-segment cylinder used by capsule limbs AND the equator
-    ring aligns 1-to-1 with the cylinder end ring, so silhouettes meet flush."""
+    """Unit UV sphere, poles ±Y. `n_lat` odd so a ring lands at the equator;
+    n_lon=16 matches the capsule cylinder so end rings meet flush."""
     verts: List[List[float]] = [[0.0, -1.0, 0.0]]  # south pole at index 0
     for i in range(1, n_lat + 1):
         lat = -0.5 * np.pi + np.pi * i / (n_lat + 1)
@@ -924,8 +872,8 @@ def uv_sphere_unit(n_lat: int = 9, n_lon: int = 16) -> Tuple[np.ndarray, np.ndar
 def flat_shade_mesh(
     verts: np.ndarray, faces: np.ndarray, joints: np.ndarray, weights: np.ndarray,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """Smooth -> flat by duplicating verts per face; each triangle gets 3
-    unique verts sharing its face normal. Skinning attrs duplicated alongside."""
+    """Flat-shade by duplicating verts per face; each triangle gets 3 unique
+    verts sharing its face normal. Skinning attrs duplicated alongside."""
     F = faces.shape[0]
     new_v = np.zeros((F * 3, 3), dtype=np.float32)
     new_n = np.zeros((F * 3, 3), dtype=np.float32)
@@ -949,9 +897,8 @@ def flat_shade_mesh(
 def smooth_shade_mesh(
     verts: np.ndarray, faces: np.ndarray, joints: np.ndarray, weights: np.ndarray,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """Area-weighted per-vertex normals (smooth shading). Geometry, skinning,
-    indexing pass through unchanged so vertex colors stay aligned. Orphan
-    verts get +Y fallback."""
+    """Area-weighted per-vertex normals. Geometry/skinning/indexing pass through
+    unchanged so vertex colors stay aligned. Orphan verts get +Y fallback."""
     Nv = int(verts.shape[0])
     v0 = verts[faces[:, 0]]
     v1 = verts[faces[:, 1]]
@@ -994,11 +941,9 @@ def rotation_align(from_vec: np.ndarray, to_vec: np.ndarray) -> np.ndarray:
 def make_lit_material(
     roughness: float = 0.85, double_sided: bool = False, opacity: float = 1.0,
 ) -> dict:
-    """Lit PBR material using vertex COLOR_0 multiplicatively. KHR_materials_unlit
-    is intentionally off so viewer lighting reveals surface form. metallic=0
-    keeps the surface dielectric so vertex colors stay readable. roughness=0.85
-    suits dense rainbow body meshes; 0.3 matches SCAIL-Pose's glossy rig look.
-    opacity < 1 switches to alpha-blend (e.g. see-through body mesh over bones)."""
+    """Lit PBR material using vertex COLOR_0. Dielectric (metallic=0) so colors
+    stay readable; roughness 0.85 suits rainbow body meshes, 0.3 the glossy
+    SCAIL rig. opacity < 1 switches to alpha-blend."""
     a = float(max(0.0, min(1.0, opacity)))
     mat = {
         "pbrMetallicRoughness": {
@@ -1182,14 +1127,12 @@ def openpose_render_keypoints(
     person: Dict[str, Any], pose_data: Optional[Dict[str, Any]], part: str,
     *, dim: int, H: int = 0, W: int = 0,
 ) -> Optional[np.ndarray]:
-    """OpenPose keypoints for one person, in op-layout, CAMERA frame (Y-down).
+    """OpenPose keypoints for one person, op-layout, camera frame (Y-down).
     `part` in {'body','hand_r','hand_l'}. dim=3 -> (K, 3) metres pre-cam_t-add;
-    dim=2 -> (K, 2) image pixels. Returns None when the source data is missing.
+    dim=2 -> (K, 2) pixels. Returns None when source data is missing.
 
-    External rigs (override carries the joint-index map) resolve from per-frame
-    `pred_joint_coords` (rig-native Y-up -> flipped to camera Y-down, matching
-    the pred_vertices convention). MHR reindexes the stored
-    `pred_keypoints_{3d,2d}` via the MHR70 map."""
+    External rigs resolve from `pred_joint_coords` (Y-up -> flipped to Y-down);
+    MHR reindexes stored `pred_keypoints_{3d,2d}` via the MHR70 map."""
     map_key, w_key, mhr_map = _OPENPOSE_RENDER_MAPS[part]
     override = _get_skeleton_override(pose_data)
     ext_map = override.get(map_key) if override is not None else None
@@ -1228,11 +1171,9 @@ def openpose_render_keypoints(
     return kp_full[mhr_map]
 
 
-# Face landmarks from the MHR rig (option `face_source="rig"`).
-# MHR has no face bones — face deforms via expr_params morphs — so landmarks
-# are sourced from `pred_vertices` at fixed vertex IDs picked by NN against
-# anatomically-plausible target xyz in canonical Y-up. Iterate visually in
-# Blender and tweak targets if landmarks land off-surface.
+# Face landmarks (face_source="rig"). MHR has no face bones, so landmarks are
+# sourced from `pred_vertices` at vertex IDs picked by NN against the target xyz
+# below. Tweak targets if landmarks land off-surface.
 
 # (name, target_xyz) in MHR canonical Y-up meters.
 FACE_LANDMARK_TARGETS: Tuple[Tuple[str, Tuple[float, float, float]], ...] = (
@@ -1290,10 +1231,8 @@ def select_face_landmark_vert_ids(
     face_mask: Optional[np.ndarray] = None,
 ) -> np.ndarray:
     """Pick MHR head vertex IDs for each `FACE_LANDMARK_TARGETS` by NN in
-    canonical positions. Filter: `face_mask` (verts that deform with any of
-    the 72 expression axes) if available — keeps chin/jaw search off the
-    neck. Otherwise a position bbox (less reliable; throat verts sometimes
-    pull chin targets)."""
+    canonical positions, restricted to `face_mask` verts (expression-deforming)
+    when available, else a position bbox (less reliable around the chin/jaw)."""
     P = np.asarray(canonical_positions, dtype=np.float32).reshape(-1, 3)
     if face_mask is not None and np.asarray(face_mask).any():
         valid = np.where(np.asarray(face_mask).reshape(-1))[0]
diff --git a/comfy_extras/sam3d_body/export/glb_skeletal.py b/comfy_extras/sam3d_body/export/glb_skeletal.py
index 128a1c5bd..5c03ac5c8 100644
--- a/comfy_extras/sam3d_body/export/glb_skeletal.py
+++ b/comfy_extras/sam3d_body/export/glb_skeletal.py
@@ -1,19 +1,11 @@
 """GLB export — skeletal (real armature) mode.
 
-Rebuilds an Armature with the MHR 127-bone rig:
-  - per-frame local TRS comes from re-running param_transform on the saved
-    `mhr_model_params`;
-  - rest verts come from a zero-pose forward with each person's `shape_params`;
-  - sparse triplet skinning is compacted to glTF's max-4-influences-per-vertex form;
-  - facial expression is re-exposed as 72 morph targets driven by `expr_params`
-    so face animation survives plain glTF skinning.
-
-Optional bone visualization (octahedrons) is rigidly
-skinned alongside the body mesh — used to preview the armature in glTF
-viewers that don't draw bones.
-
-Shared GLB infra (writer, math, rig static extraction, shaders, normals)
-stays in `glb_shared.py`; only this mode's geometry + assembly live here.
+Rebuilds an Armature with the MHR 127-bone rig: per-frame local TRS from
+param_transform on `mhr_model_params`, rest verts from a zero-pose forward,
+sparse skinning compacted to glTF's 4-influence form, and facial expression as
+72 morph targets driven by `expr_params`. Optional octahedron bone-vis is
+rigidly skinned alongside for viewers that don't draw bones. Shared infra lives
+in `glb_shared.py`.
 """
 
 from __future__ import annotations
@@ -44,8 +36,7 @@ from .glb_shared import (
 from comfy_extras.sam3d_body.utils import jet_colormap
 
 def _bone_colors_rgb(bind_pos_m: np.ndarray, scheme: str) -> Optional[np.ndarray]:
-    """Per-bone RGB color (NJ, 3) float32 in [0, 1]. Returns None for 'white'
-    (no per-bone color → bone-vis mesh uses default unlit material)."""
+    """Per-bone RGB (NJ, 3) float32 in [0, 1]. None for 'white' (default material)."""
     if scheme == "rainbow_y":
         y = bind_pos_m[:, 1].astype(np.float32)
         y_min, y_max = float(y.min()), float(y.max())
@@ -55,9 +46,8 @@ def _bone_colors_rgb(bind_pos_m: np.ndarray, scheme: str) -> Optional[np.ndarray
 
 
 def _octahedron_unit() -> Tuple[np.ndarray, np.ndarray]:
-    """Canonical Blender-style bone octahedron. Head at origin, tail at +Y,
-    unit length, ridge at 1/10 height. 6 verts, 8 triangles. Faces wound
-    so cross(v1-v0, v2-v0) points OUTWARD from the bone axis."""
+    """Canonical Blender-style bone octahedron: head at origin, tail at +Y, unit
+    length, ridge at 1/10 height. 6 verts, 8 triangles, faces wound outward."""
     v = np.array([
         [0.0, 0.0, 0.0],   # 0: head
         [0.0, 1.0, 0.0],   # 1: tail
@@ -78,18 +68,16 @@ def _octahedron_unit() -> Tuple[np.ndarray, np.ndarray]:
 def _bone_edges(
     joint_pos_m: np.ndarray, parents: np.ndarray,
 ) -> List[Tuple[int, int, np.ndarray, np.ndarray]]:
-    """Return one (parent_idx, child_idx, head_pos, tail_pos) tuple per
-    parent→child edge in the hierarchy, skipping edges whose PARENT is a
-    root joint (those typically anchor the skeleton at world origin and
-    just look like a stray stick from origin to the body). Zero-length
-    edges are skipped too."""
+    """One (parent_idx, child_idx, head_pos, tail_pos) per parent→child edge.
+    Skips edges whose parent is a root (world-anchor sticks) and zero-length
+    edges."""
     NJ = joint_pos_m.shape[0]
     out: List[Tuple[int, int, np.ndarray, np.ndarray]] = []
     for c in range(NJ):
         p = int(parents[c])
         if not (0 <= p < NJ and p != c):
             continue
-        # Skip if parent itself is a root — that bone is a world-anchor stick.
+        # Skip world-anchor sticks: parent itself is a root.
         gp = int(parents[p])
         if not (0 <= gp < NJ and gp != p):
             continue
@@ -104,9 +92,8 @@ def _bone_edges(
 def _build_bone_octahedrons_mesh(
     bind_joint_pos_m: np.ndarray, parents: np.ndarray, half_width_m: float = 0.02,
 ) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
-    """One Blender-style octahedron per parent→child edge. Returns
-    (verts, normals, faces, joints, weights, child_idx_per_vert);
-    child_idx feeds per-bone color lookup at the call site."""
+    """One octahedron per parent→child edge. Returns (verts, normals, faces,
+    joints, weights, child_idx_per_vert); child_idx feeds per-bone color."""
     base_v, base_f = _octahedron_unit()
     canonical = np.array([0.0, 1.0, 0.0], dtype=np.float32)
 
@@ -117,8 +104,7 @@ def _build_bone_octahedrons_mesh(
     out_w: List[List[float]] = []
     child_per_vert: List[int] = []
 
-    # Width scales with length so short bones (fingers, face) don't look chunky
-    # next to long ones (limbs, spine). `half_width_m` caps long bones.
+    # Width scales with length (capped by half_width_m) so short bones aren't chunky.
     WIDTH_RATIO = 0.1
     MIN_WIDTH = 0.001
     for parent_idx, child_idx, head, tail in _bone_edges(bind_joint_pos_m, parents):
@@ -151,8 +137,8 @@ def _build_bone_octahedrons_mesh(
         out_n.extend(n_world.tolist())
         for face in base_f:
             out_f.append([int(face[0]) + v_off, int(face[1]) + v_off, int(face[2]) + v_off])
-        # Dual skin head→parent, tail→child, ridges blend by canonical Y so the
-        # bone stretches between joints instead of going rigid with one.
+        # Dual skin (head→parent, tail→child); ridges blend by canonical Y so
+        # the bone stretches between joints instead of going rigid with one.
         for k in range(base_v.shape[0]):
             y_canon = float(base_v[k, 1])
             w_parent = max(0.0, 1.0 - y_canon)
@@ -196,22 +182,17 @@ def build_glb_skeletal(
     bone_vis_color: str = "white",
     include_body_mesh: bool = True,
 ) -> bytes:
-    """Build pose_data as a real Armature GLB blob with per-bone TRS keyframes.
+    """Build pose_data as a real Armature GLB with per-bone TRS keyframes. For
+    MHR, facial expression is exposed as 72 morph targets when
+    include_face_morphs=True.
 
-    For MHR (default) facial expression is exposed as 72 morph targets driven
-    by expr_params per frame when include_face_morphs=True.
-
-    External skeletons (e.g. ComfyUI-Kimodo) can supply a
-    ``pose_data["_skeleton_override"]`` dict to bypass the MHR rig extraction
-    entirely. When present, ``model`` may be None and the rig data, bind pose,
-    skin weights, and rest verts come from the override. Per-frame skeletal
-    state still reads ``pred_global_rots`` / ``pred_joint_coords`` from each
-    person dict (kimodo populates these from its own FK output). See
-    ``glb.shared._get_skeleton_override`` for the override schema.
+    External skeletons (e.g. ComfyUI-Kimodo) can supply
+    ``pose_data["_skeleton_override"]`` to bypass MHR rig extraction (``model``
+    may be None then); per-frame state still reads ``pred_global_rots`` /
+    ``pred_joint_coords``. See ``glb_shared._get_skeleton_override`` for the schema.
     """
     frames = pose_data["frames"]
-    # Only `pred_cam_t` is camera-y-down; mhr_model_params, lbs_*, expr_basis,
-    # faces are all rig-native (Y-up).
+    # Only `pred_cam_t` is camera-y-down; everything else is rig-native Y-up.
     faces_native = np.ascontiguousarray(pose_data["faces"], dtype=np.uint32)
     tracks = collect_tracks(pose_data, track_index)
     if not tracks:
@@ -219,17 +200,14 @@ def build_glb_skeletal(
 
     rig = Rig.from_pose_data(pose_data, model)
     NJ = rig.num_joints
-    # NV = rig.num_verts
     NEXPR = rig.num_expr
     parents = rig.parents
     if not rig.can_rerun_fk:
-        # External rigs have no PCA pose params to re-run; only stored globals
-        # are available, and they store joint coords already Y-up.
+        # External rigs have no PCA pose params to re-run; use stored globals.
         use_stored_global_rots = True
     joint_coords_y_down = rig.per_frame_y_down
-    # Skinning is already compacted to ≤8 influences per vertex (MHR averages
-    # ~2.8 but some shoulder/hip verts hit 5-8; keeping only 4 there leaks
-    # per-bone rotation noise into the rendered mesh).
+    # Skin already compacted to ≤8 influences/vertex (some shoulder/hip verts
+    # need >4, else per-bone rotation noise leaks into the mesh).
     joints_8 = rig.lbs_joints
     weights_8 = rig.lbs_weights
     actual_max_inf = rig.lbs_max_inf
@@ -238,14 +216,12 @@ def build_glb_skeletal(
     use_set1 = actual_max_inf > 4
     joints_set1 = np.ascontiguousarray(joints_8[:, 4:8]) if use_set1 else None
     weights_set1 = np.ascontiguousarray(weights_8[:, 4:8]) if use_set1 else None
-    # Derive bone locals from the rig's bind globals rather than recomputing
-    # FK ourselves, so any mismatch between `parents` and the rig's actual FK
-    # is absorbed into the local TRS instead of producing wrong globals.
+    # Derive bone locals from bind globals so any `parents`/FK mismatch is
+    # absorbed into the local TRS instead of producing wrong globals.
     bind_global_m = rig.bind_global_m
     bind_local = bone_locals_from_globals(bind_global_m[None], parents)[0]
 
-    # IBP = inverse of bind global. With bone defaults set to bind_local and
-    # FK composed via `parents`, skin_matrix at rest = identity.
+    # IBP = inverse of bind global → skin_matrix at rest is identity.
     ibp_mat4 = ibp_from_bind_global(bind_global_m)
 
     w = GLBWriter()
@@ -316,9 +292,7 @@ def build_glb_skeletal(
         body_mesh_node_idx: Optional[int] = None
 
         if include_body:
-            # MHR rest verts depend on the subject's shape_params; external rigs
-            # ship fixed rest verts and ignore the arg (so the empty external
-            # `shape_params` is harmless).
+            # MHR rest verts depend on shape_params; external rigs ignore the arg.
             shape_params_arr = np.asarray(
                 frames[frame_indices[0]][person_k].get("shape_params", []),
                 dtype=np.float32,
@@ -349,8 +323,8 @@ def build_glb_skeletal(
                 "indices": indices_acc,
                 "mode": 4,
             }
-            # See-through body when bones are shown, else opaque (only when a
-            # vertex-color shader baked COLOR_0 — otherwise default material).
+            # See-through body when bones are shown, else opaque (only if a
+            # shader baked COLOR_0; otherwise default material).
             if color_acc is not None or include_bones:
                 materials.append(make_lit_material(opacity=0.35 if include_bones else 1.0))
                 primitive["material"] = len(materials) - 1
@@ -373,8 +347,7 @@ def build_glb_skeletal(
         if include_bones:
             bone_palette = _bone_colors_rgb(bind_global_m[:, :3], bone_vis_color)
 
-            # Indexes `bone_palette`: octahedrons use the bone's child joint so
-            # every bone has its own color regardless of skin target.
+            # Color by child joint so every bone has its own color.
             color_idx_per_vert: Optional[np.ndarray] = None
             hw = float(bone_vis_radius_m)
             bv_v, bv_n, bv_f, bv_j, bv_w, child_per_vert = _build_bone_octahedrons_mesh(
@@ -422,8 +395,8 @@ def build_glb_skeletal(
                 nodes.append(bv_mesh_node)
                 person_root["children"].append(len(nodes) - 1)
 
-        # Per-frame GLOBAL skel state → bone locals via parent-inverse.
-        # Default uses the rig's stored output; the fallback re-runs FK.
+        # Per-frame global skel state → bone locals via parent-inverse. Stored
+        # output by default; fallback re-runs FK.
         if use_stored_global_rots:
             rig_global_m = global_skel_state_from_pose_data(
                 pose_data, frame_indices, person_k, NJ,
@@ -437,11 +410,9 @@ def build_glb_skeletal(
             rig_global_cm = global_skel_state_per_frame(model, mp_per_frame)
             rig_global_m = rig_global_cm.copy().astype(np.float32)
             rig_global_m[..., :3] *= 0.01
-        # Sign-fix on the GLOBAL quats BEFORE deriving locals. The rig's
-        # Euler-XYZ parametrization wraps at ±180° for spinning joints; if we
-        # only fix locals, the parent's flip propagates into the child's
-        # local translation (t_local inherits parent sign via q_parent_inv)
-        # and produces visible "axis resets" mid-animation.
+        # Sign-fix global quats BEFORE deriving locals: a parent's ±180° flip
+        # would otherwise propagate into the child's local translation and cause
+        # visible "axis resets" mid-animation.
         rig_global_m[..., 3:7] = quat_sign_fix_per_joint(rig_global_m[..., 3:7])
         bone_local_anim = bone_locals_from_globals(rig_global_m, parents)
         local_t = bone_local_anim[..., :3].astype(np.float32)
@@ -449,20 +420,17 @@ def build_glb_skeletal(
         local_s = bone_local_anim[..., 7].astype(np.float32)
         # Second pass on locals catches residual drift from the parent-inverse.
         local_q = quat_sign_fix_per_joint(local_q)
-        # Hemisphere-align frame 0 with the bind quat so pause/play takes the
-        # short path; then re-propagate.
+        # Align frame 0 with the bind quat so pause/play takes the short path.
         bind_q = bind_local[:, 3:7].astype(np.float32)
         if local_q.shape[0] > 0:
             d0 = (bind_q * local_q[0]).sum(axis=-1)
             sign0 = np.where(d0 < 0, -1.0, 1.0).astype(np.float32)[:, None]
             local_q[0] = local_q[0] * sign0
             local_q = quat_sign_fix_per_joint(local_q)
-        # Optional smoothing for multi-frame rig spikes (e.g. q.w discontinuity
-        # at handstand) that the upstream Smooth node may not catch.
+        # Optional smoothing for multi-frame rig spikes (e.g. q.w at handstand).
         if bone_smooth_window and bone_smooth_window > 1:
             local_q = gaussian_smooth_quats(local_q, int(bone_smooth_window))
-        # fp64 renormalize → fp32 keyframes. Viewers' nlerp amplifies non-unit
-        # drift into visible flips otherwise.
+        # fp64 renormalize → fp32; viewers' nlerp amplifies non-unit drift.
         lq64 = local_q.astype(np.float64)
         lq64 = lq64 / np.maximum(np.linalg.norm(lq64, axis=-1, keepdims=True), 1e-12)
         local_q = lq64.astype(np.float32)
@@ -527,7 +495,7 @@ def build_glb_skeletal(
                     "target": {"node": person_root_idx, "path": "translation"},
                 })
 
-        # Body-mesh-only: bone-vis primitives have no morph targets.
+        # Body mesh only — bone-vis primitives have no morph targets.
         if expr_morph_accs and body_mesh_node_idx is not None:
             expr_per_frame = np.stack([
                 np.asarray(frames[t][person_k]["expr_params"], dtype=np.float32)
diff --git a/comfy_extras/sam3d_body/utils.py b/comfy_extras/sam3d_body/utils.py
index dda3b6d04..d8d0e9eb4 100644
--- a/comfy_extras/sam3d_body/utils.py
+++ b/comfy_extras/sam3d_body/utils.py
@@ -34,8 +34,7 @@ def _bbox_from_mask(mask: torch.Tensor) -> Optional[torch.Tensor]:
 
 def inputs_from_sam3_track(track_data, B: int, H: int, W: int):
     """Unpack SAM3_TRACK_DATA into per-frame per-object bboxes + masks at image
-    resolution. Returns (per_frame_bboxes, per_frame_masks) or
-    (None, None) when the track is empty / frame count doesn't match"""
+    resolution. Returns (None, None) on empty track / frame-count mismatch."""
 
     packed = track_data.get("packed_masks") if isinstance(track_data, dict) else None
     if packed is None:
@@ -100,7 +99,7 @@ def cam_int_from_fov(height: int, width: int, fov_degrees: float) -> Optional[to
 def apply_camera_override(mhr_pose_data: Dict[str, Any], camera_info: Dict[str, Any],
                           H: int, W: int) -> Dict[str, Any]:
     """Re-project every frame's pose through a Load3D 6DOF camera (position/
-    target/zoom + optional FOV). Returns a new mhr_pose_data; unchanged on
+    target/zoom + optional FOV). Returns a new mhr_pose_data, unchanged on
     empty/invalid input."""
     first_frame = mhr_pose_data["frames"][0] if mhr_pose_data["frames"] else []
     if not first_frame:
@@ -158,16 +157,16 @@ def apply_camera_override(mhr_pose_data: Dict[str, Any], camera_info: Dict[str,
         y_axis = np.cross(z_axis, x_axis)
     R = np.stack([x_axis, y_axis, z_axis], axis=0).astype(np.float32)
 
-    # Eye: dolly along the given offset; for a rotation-only camera (position ==
-    # target) keep the predicted viewing distance so only orientation/roll changes.
+    # Eye: dolly along the offset; rotation-only camera keeps the predicted
+    # viewing distance so only orientation/roll changes.
     if has_offset:
         eye = target + offset / max(0.01, zoom)
     else:
         d = max(0.1, float(target[2]))
         eye = target - z_axis * (d / max(0.01, zoom))
 
-    # Lens: use the camera's own FoV; else the SAM3D predicted focal (viewpoint-
-    # only change). Three.js fov is vertical → focal from image height.
+    # Lens: camera FoV if given, else the SAM3D predicted focal. Three.js fov
+    # is vertical → focal from image height.
     cam_fov = float(camera_info.get("fov", 0.0) or 0.0)
     if cam_fov > 0:
         new_focal = float(H) / (2.0 * float(np.tan(np.deg2rad(cam_fov) / 2.0)))
@@ -178,10 +177,8 @@ def apply_camera_override(mhr_pose_data: Dict[str, Any], camera_info: Dict[str,
 
     center = np.array([W * 0.5, H * 0.5], dtype=np.float32)
     reproj = {"pred_keypoints_3d": "pred_keypoints_2d", "pred_face_keypoints_3d": "pred_face_keypoints_2d"}
-    # External rigs (e.g. Kimodo) store pred_joint_coords rig-native Y-up; the
-    # render openpose/scail keypoint provider resolves from them and flips Y/Z.
-    # Transform them through the camera too (in camera space, then back to Y-up)
-    # so those keypoints follow the override instead of staying in the old frame.
+    # External rigs store pred_joint_coords Y-up; transform them through the
+    # camera too (in camera space, then back to Y-up) so they follow the override.
     override = mhr_pose_data.get("_skeleton_override")
     joints_y_up = override is not None and not bool(override.get("per_frame_y_down", False))
     new_frames: List[List[Dict[str, Any]]] = []
@@ -242,8 +239,7 @@ def run_batched_single_chunk(inner: SAM3DBody, frames_rgb: List[torch.Tensor], p
     img_per_crop = [frames_rgb[f] for f in range(N) for _ in range(K)]
 
     if per_frame_masks is not None:
-        # Broadcast a single-mask bundle to per-bbox: when the user supplied one
-        # mask but multiple bboxes per frame, each bbox gets the same mask.
+        # One mask but multiple bboxes per frame → each bbox gets the same mask.
         flat_masks = []
         for f in range(N):
             mf = per_frame_masks[f]