Alembic motion blur still fires random velocity vectors and crashes Blender #82286

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opened 2020-11-01 00:30:28 +01:00 by Yegor · 11 comments

System Information
Operating system: Linux-5.4.0-48-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.66

Blender Version
Broken: version: 2.91.0 Beta, branch: master, commit date: 2020-10-27 16:38, hash: bee5921e82, 2.92, 2.90.1

Short description of error
Rendering an alembic came from houdini or marvelous designer gives incorrect result on cpu and the same on gpu, but also crashes Blender. Vertex interpolation option gives incorrect mblur render as well, but looking differently.

Exact steps for others to reproduce the error
mblur_test.blend

mblur_test.abc

  • Open the file
  • Render the sequence on cpu
  • Render the sequence on gpu (possible crash)
**System Information** Operating system: Linux-5.4.0-48-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.66 **Blender Version** Broken: version: 2.91.0 Beta, branch: master, commit date: 2020-10-27 16:38, hash: `bee5921e82`, 2.92, 2.90.1 **Short description of error** Rendering an alembic came from houdini or marvelous designer gives incorrect result on cpu and the same on gpu, but also crashes Blender. Vertex interpolation option gives incorrect mblur render as well, but looking differently. <video src="https://archive.blender.org/developer/F9143454/0220-0250.mp4" title="0220-0250.mp4" controls></video> **Exact steps for others to reproduce the error** [mblur_test.blend](https://archive.blender.org/developer/F9143457/mblur_test.blend) [mblur_test.abc](https://archive.blender.org/developer/F9143459/mblur_test.abc) - Open the file - Render the sequence on cpu - Render the sequence on gpu (possible crash)
Author

Added subscriber: @YegorSmirnov

Added subscriber: @YegorSmirnov

#87587 was marked as duplicate of this issue

#87587 was marked as duplicate of this issue

Added subscribers: @kevindietrich, @rjg

Added subscribers: @kevindietrich, @rjg

I can't reproduce a crash rendering on GPU, but I do see that the output looks incorrect.

@kevindietrich This might be something for you to look at.

I can't reproduce a crash rendering on GPU, but I do see that the output looks incorrect. @kevindietrich This might be something for you to look at.

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

There are no velocity vectors in the Alembic archive, so Cycles generates motion blur data from the vertex positions of the previous and next frames. As far as I can tell, the number of vertices match between frames, however, the numbers of vertices read from the archive do not match the one Cycles gets (1187 vs 1188, respectively). In other Alembic files, those numbers match. Overall, I think it is the same problem as #80323.

There are no velocity vectors in the Alembic archive, so Cycles generates motion blur data from the vertex positions of the previous and next frames. As far as I can tell, the number of vertices match between frames, however, the numbers of vertices read from the archive do not match the one Cycles gets (1187 vs 1188, respectively). In other Alembic files, those numbers match. Overall, I think it is the same problem as #80323.
Kévin Dietrich was assigned by Sybren A. Stüvel 2020-11-03 10:56:56 +01:00
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Member

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'
Member

@kevindietrich : havent checked myself here, but from previous post I would assume we can actually confirm this.

@kevindietrich : havent checked myself here, but from previous post I would assume we can actually confirm this.

Added subscribers: @marks-4, @mano-wii

Added subscribers: @marks-4, @mano-wii
Member

Added subscriber: @EAW

Added subscriber: @EAW
Philipp Oeser removed the
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Reference: blender/blender#82286
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