wrong motion blur from usd in cycles and reverting to the first frame when disabeling motion blur #118261
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Reference: blender/blender#118261
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System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3070 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.23
Blender Version
Broken: version: 4.1.0 Beta, branch: blender-v4.1-release, commit date: 2024-02-12 20:16, hash:
d45175c919f3
Worked: (newest version of Blender that worked as expected)
Short description of error
I was experimenting with hair curves that I exported from Houdini and noticed a few issues.
First of all Eevees motion blur appears to be correct and changing the shutter in the render properties changes the intensity of the mb as expected. Cycles on the other hand ignores the changes.
Image 1 shows the default look, Img. 2 shows the result with a lower shutter and velocity speed value. For comparison: Img. 3 is the expected result I get when I scale the speed down in Houdini.
Changine the velocity scale in the MeshSequenceCache has no effect. (Eevee and Cycles)
If you deactivate motion blur altogether, the first frame of the mesh sequence is used. In my case frame 72 even though I am trying to render frame 81. This is the case in Eevee and Cycles
Although a known missing feature, importing a custum or even a color attribute when using point is still impossible.
The Zip file includes the .usd file that I used and the blender setup. (The usd does not include the curveu and cd attribute, I tried that separately)
It would be lovely if you could use Blender to render hair exported from Houdini, for example.
Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
Hi, thanks for the report. Can confirm this in 4.2
This is unrelated to this issue AFAICS.
cc @deadpin
This is very likely related to #112308 / #58704
Solution is in the works , see !115623
Yes, !115623 will fix this problem (confirmed locally). There's some unfortunate drawbacks to the patch but the Module team has decided to try pushing it through since it addresses so many of these cases and unblocks other features. The plan is to fixup the patch this week and hopefully commit it soon after as long as no further issues are discovered.
Resolved with
ea256346a8