tutorials/utility/sam3d-body

[giscus[bot]]

tutorials/utility/sam3d-body

Extract a full-body 3D human mesh from a video using SAM 3D Body, with pose and shape estimation, face expressions, and a rendered mesh overlay video.

https://docs.comfy.org/tutorials/utility/sam3d-body

[wmaher2]

The FBX output is only frame 1.

[lin-bot23]

Hi @wmaher2, thanks for the report. Quick clarification first: the SAM 3D Body workflow does not actually export FBX. The Create 3D Animation node outputs either an animated GLB (per-frame TRS keyframes + skinning) or a BVH mocap clip, and Save 3D Model just writes those bytes to disk as-is.

If you are ending up with an FBX containing only frame 1, that conversion step is likely where the animation is being dropped. Two things to check:

1. How was the FBX produced? If you converted the GLB (e.g. via Blender or a converter script), make sure the importer/exporter actually bakes animation. In Blender: import the GLB, confirm the armature has keyframes on the timeline, then export FBX with Baked Animation enabled (and NLA strips off, or bake all actions).
2. Where are you viewing the FBX? Some viewers only show the bind pose / first frame. Try scrubbing the timeline in Blender or another DCC to confirm whether the animation data is present but simply not playing.

If you converted the GLB yourself and still only get one frame, let us know which tool and settings you used for the conversion and we can narrow it down further. If you saw FBX mentioned somewhere in the docs that led you to expect a native FBX export, please point us to the page and we will correct it.

[wmaher2]

I assumed, because the "Save 3D (Advanced)" node in the template shows the FBX as a download option. I got it working with the GLB in Houdini with a gltfcharacterimport node-with NodeID to track00_mesh then connected the 3 outputs to a Bone Deform node:

gltfcharacterimport1 "NodeID to track00_mesh"
Rest Geometry output → Bone Deform input 1
Capture Pose output → Bone Deform input 2
Animated Pose output → Bone Deform input 3

Thanks, this is a very useful tool for non-ML projection-based beauty work, like digital make-up etc.

[wmaher2]

Now to figure out the morph targets for face.