Eevee motion blur or Geometry node is bugging material #93297

New Issue

nameless · 2021-11-22T16:11:57+01:00

nameless commented

2021-11-22 16:11:57 +01:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12

Blender Version
Broken: version: 3.0.0 Beta, branch: master, commit date: 2021-11-20 16:50, hash: 1b2ee3cf20

Short description of error
When you enable Motion Blur in Eevee and hit render, material of one object looks wrong (it's like warped into origin/center). Noticed if you disconnect one part of Geometry Node graph, material gets fixed back. Can't tell who's faulty there - needs dev investigation.

Correct look:

Bugged look:

EDIT - tested on newest nvidia drivers as of 22th November - no changes.
EDIT2 - video demo - 1st render is correct, 2nd after enabling Motion blur, 3rd after cutting off part of GN graph - https://files.catbox.moe/y372d6.mp4

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]

Enable Motion Blur in Eevee
Render Image
Material gets rendered wrongly
Cut off top part of Geometry Node graph (green frame)
Render Image again
Material is correct
motionBlurGNbug.blend

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12 **Blender Version** Broken: version: 3.0.0 Beta, branch: master, commit date: 2021-11-20 16:50, hash: `1b2ee3cf20` **Short description of error** When you enable Motion Blur in Eevee and hit render, material of one object looks wrong (it's like warped into origin/center). Noticed if you disconnect one part of Geometry Node graph, material gets fixed back. Can't tell who's faulty there - needs dev investigation. Correct look: ![image.png](https://archive.blender.org/developer/F11846454/image.png) Bugged look: ![image.png](https://archive.blender.org/developer/F11846428/image.png) EDIT - tested on newest nvidia drivers as of 22th November - no changes. EDIT2 - video demo - 1st render is correct, 2nd after enabling Motion blur, 3rd after cutting off part of GN graph - https://files.catbox.moe/y372d6.mp4 **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] 1. Enable Motion Blur in Eevee 2. Render Image 3. Material gets rendered wrongly 4. Cut off top part of Geometry Node graph (green frame) 5. Render Image again 6. Material is correct [motionBlurGNbug.blend](https://archive.blender.org/developer/F11845758/motionBlurGNbug.blend)

nameless commented

2021-11-22 16:11:57 +01:00

Added subscriber: @tonpix

Jacques Lucke commented

2021-11-23 13:52:45 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2021-11-23 13:52:45 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Jacques Lucke commented

2021-11-23 13:52:45 +01:00

This seems to be a problem in motion_blur_deform_data_get with geometry instances.

This seems to be a problem in `motion_blur_deform_data_get` with geometry instances.

nameless commented

2021-11-23 14:48:18 +01:00

Is there some workaround I could use? I've noticed only this instancer in green frame causes problems, but other instancers in GN graph weren't causing problems. Could it be that problematic instancer spawned too many instances?

Jacques Lucke commented

2021-11-23 14:52:10 +01:00

One workaround might be to realize instances, haven't tried. However, you can also just wait for the fix (D13334) to be committed.

One workaround might be to realize instances, haven't tried. However, you can also just wait for the fix ([D13334](https://archive.blender.org/developer/D13334)) to be committed.

blender-admin commented

2021-11-23 16:40:21 +01:00

This issue was referenced by a6b7f32112

This issue was referenced by a6b7f3211205032b0b35bac489127d38ca6f004e

Jacques Lucke commented

2021-11-23 16:41:45 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2021-11-23 16:41:45 +01:00

Jacques Lucke self-assigned this 2021-11-23 16:41:45 +01:00

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Eevee motion blur or Geometry node is bugging material #93297