Hi, it has happened a few times before that we had a problem with a not so perfect 3d track from tracking software. We missed it a couple of times, it showed up in compositing after rendering the 3D plate. They were easy fixes in comp so we left it at that - we figured the 3d track was not good and we just missed it. But this time I decided to get to the bottom of a case we encountered. Same thing - rendered a 3d plate for a 3d tracked shot - the rendered plate does not sit exactly, pixel perfect - obviously the track is not perfect - back to 3D tracking software - the track is perfect - imported the FBX camera file to Blender - the track is perfect - imported the FBX camera file to 3ds Max - the track is NOT perfect Turns out the FBX importer does a key reduction pass after importing - simplifying all animation keys. This was a surprise for us especially as it is not documented in the Max help, and there is no way to disable the process. The only reason I found it was thanks to people in the Beta forums and they directed me to MXS SDK, where this key reduction is documented together with a MXS code to disable it - unfortunately that setting is not sticky 😞 Now I understand why this function exists, and people on the forums explained to me why it's a good thing that it is on by default. But please, there needs to be an option in the FBX importer dialog to disable it at will. People need to know that the importer might alter their animation. Especially that the key reducer is dumb, has a set tolerance threshold in system units and it is possible, that if you import your FBX animation into a large scene with large system units, like kilometers or miles - the ENTIRE animation will be erased by the key reducer 😮
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