USD Python tools and Blend Shapes not working

Question

Created Sep ’20

Replies 4

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USDPython 0.64 supports gltf and fbx blend shapes but no blend shape animation is shown in the results. Tried from Maya and Blender, even with complex FACS face rig and a single blend shape/morph target.

Did someone succeeded? Please link me an fbx where the blend shape conversion works

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Answer 1

YojimboMaster OP

Oct ’20

Still monitoring this issue, I think we might need to wait.

Reality Converter app is still at 0.62. That one need an update. While latest USDPython was in April 2020. I tested USDZConvert with 0.64 just now, ARQuickLook is not displaying Blendshapes animation.

Is the AR things being postponed?

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Answer 2

beatbits OP

Jan ’21

Has anybody found a way to create blend shape animations and export to USDZ yet? I've given up on getting them to work by exporting to DAE (at least from a Maya rig). Seeing the same issue based on various threads I've found online: (https://developer.apple.com/forums/thread/101547 and forums.autodesk.com/t5/maya-forum/exporting-keyed-blend-shape-anims-for-scenekit-with-fbx-dae/td-p/7980397) it appears it's not currently possible.

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Answer 3

rforman9 OP

Mar ’21

I have also been looking for this solution for the past few weeks, and I have not found a solution yet. Each Maya usd export plugin has it's issues. The Multiverse plugin does not support blendshapes yet. The Autodesk plugin loses the joint positions. The closest I've gotten is exporting fbx from Maya, converting fbx2gltf with the facebook command line utility, and importing the gltf into scenekit. The only issues are that the blendshape names don't translate over. The are listed as numbers (0,1,2,3,...),and the geometry that the blendshapes deform don't have any normal data in the vertices, so it looks faceted. Also the joints for the skeleton are all translated to the origin.

If anyone has a solution for this, please share!

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Answer 4

pberto OP

Jun ’21

The Multiverse plugin does not support blendshapes yet

We have recently added support for blend shapes in Multiverse 6.7 (https://multi-verse.io): you an have multiple shape targets, in-betweens and works as well in conjunction with usdSkel and skin weight. Let us know if you can do what you want, if not feel free to contact us.

Cheers!

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