Motion Blur causes visual glitch on point cloud object moving #102505
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Reference: blender/blender#102505
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System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 522.30
Blender Version
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-11-14 02:27, hash:
5fe146e505Worked: not known
Short description of error
Point cloud object + Motion Blur + animation. The first frame of animated movement will incorrectly render compared to before and after the animation starts.
Exact steps for others to reproduce the error
Convert Cube to point cloud
Add a location keyframe on frame 2
move the object and add another keyframe on frame 3
Render with motion blur turned on.
Compare the rendered frames.
frame 1 looks correct, frame 2 is too dim even though it is not moving yet.
Note: CPU renders frame 3 incorrectly as well. not sure if this requires another bug report.
Frame 1:
Frame 2:
Frame 3 on GPU:
Frame 3 on CPU:
[Based on the default startup or an attached .blend file (as simple as possible)]
MotionBlur_PointCloud.blend
Added subscriber: @KeirCB
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Confirmed'
I can confirm the problem.
In fact the point clouds in frame 2 (which still haven't moved) have darkened.
And frame 3 renders wrong on the CPU.
I can confim this issue is still present in 3.6.0 Alpha, branch: main, commit date: 2023-03-11 01:59, hash:
b06edc2897