Cycles : Motion blur bug #70694
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Reference: blender/blender#70694
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System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48
Blender Version
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 18:33, hash:
e846852862Short description of error
On the frame 13 I have a really strong motion blur, but the speed of my camera or my object isn’t changing that much. If I offset the entire animation of the camera even slightly, it disappears.
If I turn the motion blur off, it disappears as well.
Changing the animation of the card does not change anything.
Exact steps for others to reproduce the error
cycles_bug.blend
Added subscriber: @thornydre
Added subscriber: @Scaredyfish
I get the same result. Here's a less noisy version.
Added subscriber: @mano-wii
I can replicate, but I'm not sure if the problem is in the file or in Cycles.
Added subscriber: @GiacomoDavideBalma
May be related to #66529
Added subscriber: @MateuszMielnicki
I can confirm that its happening from time to time in 2.8 stable.
Cant be file fault, I have cleaned everything up trying to debug it...
It seams to look close to artifacts with #66529
Maybe some precision error? while computing velocity... also alpha channel sems to be much more blurried in this frames.
Here is my file, same error but without spinning, only camera movement.
Frame 122 is different than others in all animation.
Added subscriber: @brecht
Changed status from 'Confirmed' to: 'Resolved'
Resolved along with #66529 according to comment there.