Open Asset Import Library
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@fegennari Please attach the problematic fbx 3D model here so others might reproduce the problem, thank you |
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This is the model I'm having problems with. I converted it to GLTF and GLB and these versions work. The original source is from here: https://sketchfab.com/3d-models/animated-bird-pigeon-797d27b68af3453e865149435df6aa30 |
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My implementation is using assimp from about 10 days ago, so fairly recent. The 5 animations are there and seem to work OK; note that there's a problem with the model (at least in my implementation) where a number of mesh faces are missing, and turning on double-sided rendering doesn't fix the problem; the main effect is that the pigeon has no face (no eyes/beak) and its right wing is missing. Having said that, the geometry that is visible looks correct (i.e. doesn't appear to exhibit the "random triangles" problem) Screenshot attached, animation running about half speed to be able to see the flapping better, cycling through the 5 animations P.S. Thank you for including the original sketchfab link, I wish more people did that 😅 |
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Interesting. All 5 animations are present for me as well, and they do move the model to some degree. Maybe my viewer is drawing those missing head and wing triangles at random places, and this is what I'm seeing. It's not completely random. It's like half a bird with random triangles that extend further out than the bounds of the bird and mostly block my view of the "correct" triangles. Actually mine looks more like it has feet and a tail but is missing the wings, head, and parts of the body. Maybe the animations are fine and something is wrong with the model geometry. But this worked perfectly in an Assimp build from 2 years ago, and it works fine in a different viewer. So something is definitely broken (or at least different) in Assimp. |
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Here is what the bird is supposed to look like, recorded a year ago: I loaded it in my model viewer rather than the city scene where I use the bird. This uses somewhat of a different rendering system. The broken version looks different here, less random and very stretched. Here it is in T pose with animations disabled. This looks correct. And here is the animated version when linking against the old Assimp. |
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Tried a few days ago and also met this issue. |
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Have you tried the 6.0 release? I tested it and my bird model is working again. It's possible that you're running into a different bug. There seem to be quite a few FBX importer bugs. |
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Have you tried the latest master? We fixed a couble of issues related to the time calculation and in some other fields related to the animation systems of FBX-files. |
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I had previously been using Assimp from GitHub, version c2967cf from 10/23/22. I just recently switched to using the version from vcpkg on Windows, which I assume is newer, though I'm not sure how to tell.
The problem is that I have one animated FBX model with multiple animations that no longer works. All animations result in a blob of random triangles that look nothing like the original model. I assume it's some transform problem. Every other animated FBX model I have works fine.
How do I debug this? My code was mostly taken from tutorials that were working with the old Assimp. Is there some known issue with FBX models containing multiple animations? Something major that changed with the way this works? Some new option that was added that may fix this?
My only other alternative is to binary search through some ~1000 commits to try and find the one that broke things. That would probably take many many hours. Or go back to using the old version.
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