Motion Blur stop to work at a certain frame (animation) from alembic file. #86669

New Issue

emoctral · 2021-03-17T18:15:50+01:00

emoctral commented

2021-03-17 18:15:50 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab
Worked: (newest version of Blender that worked as expected)

Short description of error
Importing an alembic file from Houdini to Blender, to instance spheres on lot of vertex points.
The problem occurs when I try to render the 467 frame to the 500th. Every frames before the 467th are working.
The problem disappears when I desactivate the motion blur. The motion blur works fine before the 467th frame, and for no reason stop working with huge huge render time.

Exact steps for others to reproduce the error
Import alembic file (from particles sim) to blender.
Instance spheres on.
Activate motion blur.
Render animation.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` Worked: (newest version of Blender that worked as expected) **Short description of error** Importing an alembic file from Houdini to Blender, to instance spheres on lot of vertex points. The problem occurs when I try to render the 467 frame to the 500th. Every frames before the 467th are working. The problem disappears when I desactivate the motion blur. The motion blur works fine before the 467th frame, and for no reason stop working with huge huge render time. **Exact steps for others to reproduce the error** Import alembic file (from particles sim) to blender. Instance spheres on. Activate motion blur. Render animation.

emoctral commented

2021-03-17 18:15:50 +01:00

Added subscriber: @emoctral

emoctral changed title from ~~Motion Blur bugged at a certain frame from alembic file.~~ to Motion Blur stop to work at a certain frame (animation) from alembic file.

2021-03-17 18:17:34 +01:00

emoctral commented

2021-03-17 19:56:46 +01:00

Removed subscriber: @emoctral

emoctral commented

2021-03-17 19:56:47 +01:00

Added subscriber: @emoctral

Romain Toumi commented

2021-03-17 20:25:03 +01:00

Added subscriber: @ToumiX

Romain Toumi commented

2021-03-17 20:25:03 +01:00

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

Romain Toumi closed this issue

2021-03-17 20:25:03 +01:00

Romain Toumi self-assigned this 2021-03-17 20:25:03 +01:00

Romain Toumi commented

2021-03-17 20:25:03 +01:00

Cycles creates motion blur on the instantiated objects that are following cloud points.

the disappearing points are causing the index of the points to change, which causes the spheres to follow point, thus creating a huge motion blur.
that explains the very long rendering time and the "globally blurry" image

you have to disable the "reap particles" option on houdini and it works

Blender is not involved in this issue

Cycles creates motion blur on the instantiated objects that are following cloud points. the disappearing points are causing the index of the points to change, which causes the spheres to follow point, thus creating a huge motion blur. that explains the very long rendering time and the "globally blurry" image you have to disable the "reap particles" option on houdini and it works Blender is not involved in this issue ![unknown.png](https://archive.blender.org/developer/F9896841/unknown.png)

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Motion Blur stop to work at a certain frame (animation) from alembic file. #86669