Multiple objects animation (no armature) failed to convert #168
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Kind of related, but I tested a couple of BVH mocap armature into Blender and then trying to export and getting all kind of weird USDZ animation... The issue seems like the Armature is all just a separate bones, and seems like Apple usdzconvert and GLTF2USD also cannot handle such hierarchy... BLEND Blender 2.80 Wondering if this is something that can be fixed? |
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As GLTF this works: But when converted to USDZ, it failed... |
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It's just 2 box object animated for 10 frames. I provide the blend, usda, gltf, fbx --- none of them works... only 1 object animating >< |
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This one actually works... parented all objects into an empty called ROOT. It's weird. I think I've done something similar in the past (?) with eyeballs animation. |
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I tried with my Torus, with root parent... still does not work. It does not make sense... |
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My feeling is that somewhat "only 1 animation" possible under 1 action take. Sometimes with the right "hack" multiple objects can work. I tested with Sketchfab and very often only 1 animated object works... unless ... |
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My quick solution so far is to bring all those animated objects into SKETCHFAB, and then redownloading the gltf... https://sketchfab.com/3d-models/hundred-torus-procedural-animation-fd8c3e9676944d9c8faf973d47898f39 It's weird but works. Someone at Apple, working on usdzconvert need to investigate this. |
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Twitter Thread: I am still wondering what Sketchfab did when converting BLEND into GLTF that works with the converter...! BIG MYSTERY. |
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From Ash, one solution is to export as DAE, import back into Blender, export as GLTF. Then it works. Strange? |
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The answer might lie in "keyframing" everything, every channel properties and attributes of the objects, so they are all "identical" ... |
I have spheres and cones that were constrained into bones (BVH mocap animation), which I then baked, so I have like 100+ animated objects.
As GLTF, I can see them animating when I use gltf viewer (online). However converting them into USDZ and I am getting just a static result. Wondering why?
If using Apple's own usdzconvert tool, usually Armature + Mesh works fine, but in this case, 100+ animated objects are not good.
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