Cycles motion blur particle object display issue #45936
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Reference: blender/blender#45936
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System Information
System: Windows 7 64bit
RAM: 4096 MB
renderer: 'GeForce GTX 760/PCIe/SSE2'
vendor: 'NVIDIA Corporation'
version: '4.5.0 NVIDIA 353.30'
Blender Version
Broken: 2.75a (official)
Worked: (optional)
Short description of error
Unexpected motion blur display of a particle object.
Exact steps for others to reproduce the error
Please open the attached blender file and render a frame. The expected motion blur should be in the
direction of the motion (from bottom to top), instead it's radial. Somehow the initial rotation is kept.
2015-08-28-cycles-motion-blur-display-issue.blend
Changed status to: 'Open'
Added subscriber: @MichaelParucha
Added subscribers: @Sergey, @mont29
Well, vectors indeed do not look good at all, @Sergey?
Yes something is definitely not right, but the issue is not in the Cycles side. It's particle system for some reason does crazy stuff with rotation for subframes. Not sure yet what's going on here, baking psys doesn't help either.
Changed status from 'Open' to: 'Archived'
After more investigation it appears that physics in particles is not really robust enough for subframe interpolation needed for motion blur.
Particles is one of the most problematic areas in Blender currently, which needs much serious reconsiderations. Moving the report to TODO now http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles
So thanks for the report, but archiving it now.
This issue was referenced by
c1fd97f15dChanged status from 'Archived' to: 'Resolved'