Incorrect Angles After Importing a BVH file #104549
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Reference: blender/blender-addons#104549
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System Information
Operating system: Linux-5.15.0-69-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.108.03
Blender Version
Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash:
rB55485cb379f7Worked: N/A
Addon Information
Name: BioVision Motion Capture (BVH) format (1, 0, 1)
Author: Campbell Barton
Short description of error
Opening the test.bvh file attached It would be expected (as seen by opening the bvh file with a notepad application) that the first frame Neck1 ZXY values are (-20.0,-20.0,-20.0) the second frame Neck1 ZXY values are (0,0,0) the third are (-10,-10,-10) and the fourth (10,10,10).
However after opening the file with Blender 3.4.1 and inspecting the neck1 bone it is set to (-24.4,-18.8,-7.09) , second frame is correctly set to (0,0,0), third frame is set to (-11.3,-10.8,-5.12) and fourth to (8.11,14.1,8.39).
There is some sort of :
coordinate difference(?)
rotation order difference in the background conversion(?)
internal interpolation(?)
rounding error(?)
while loading the BVH file
Any idea on what is wrong or how I can have a 1:1 correspondance of the BVH file I have on disk compared to the lodaded armature in Blender?
Exact steps for others to reproduce the error
-Go to frames 1..4 on the timeline and check the incorrect values against the BVH file
Also as a side note, using a third party BVH utility like BVHacker ( https://bvhacker.com/ ) as seen in the screenshot I get the correct joint values, so I am confident the issue is not caused because of something that is wrong with the actual BVH file. (encoding, line endings etc.) but due to some sort of parsing/post-processing error.