No motion blur with rendering pointcloud #97908

New Issue

Tamino Fischer · 2022-05-06T15:43:27+02:00

Tamino Fischer commented

2022-05-06 15:43:27 +02:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.65

Blender Version
Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-05-05 19:01, hash: 108963d508
Worked: none

Short description of error
There's no motion blur for pointclouds generated and transformed inside of geonodes and rendered directly as pointcloud.
There is motion blur if you
1: Transform the container object of the geonode tree
2: Instance a mesh, which is significantly slower though.

Exact steps for others to reproduce the error

In geometry nodes, add a distribute points on faces node
add a transform node and set the z rotation (for example) to #frame
go to cycles and enable motion blur. Render the frame. No motion blur appears
you can try instancing any mesh to these points, which will produce motion blur

Point cloud motionblur bug.blend

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.65 **Blender Version** Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-05-05 19:01, hash: `108963d508` Worked: none **Short description of error** There's no motion blur for pointclouds generated and transformed inside of geonodes and rendered directly as pointcloud. There *is* motion blur if you 1: Transform the container object of the geonode tree 2: Instance a mesh, which is significantly slower though. **Exact steps for others to reproduce the error** - In geometry nodes, add a distribute points on faces node - add a transform node and set the z rotation (for example) to #frame - go to cycles and enable motion blur. Render the frame. No motion blur appears - you can try instancing any mesh to these points, which will produce motion blur [Point cloud motionblur bug.blend](https://archive.blender.org/developer/F13054801/Point_cloud_motionblur_bug.blend)

Tamino Fischer commented

2022-05-06 15:43:27 +02:00

Added subscriber: @Tamino-Fischer

James Redmond commented

2022-05-08 04:17:27 +02:00

Added subscriber: @James-Redmond

Giff commented

2022-05-09 04:34:53 +02:00

Added subscriber: @Giff-Boake

Giff commented

2022-05-09 04:34:53 +02:00

I can confirm the same issue on todays build: blender-3.3.0-alpha+ master_2a2261d7e193

RTX 3080Ti - Driver 512.59

I can confirm the same issue on todays build: blender-3.3.0-alpha+ master_2a2261d7e193 RTX 3080Ti - Driver 512.59

James Redmond commented

2022-05-09 04:49:47 +02:00

It is a hack, but you can add motion blur to geonodes point clouds if you add an attribute called "velocity" to the group output node. This is seen by Cycles for motion blur.

If you can work out the vector between the previous frame and current frame of each point and feed it into the velocity attribute, it does work. This is far from ideal, but can be a temporary workaround. Of course, I would much prefer to have this happen automatically!

It is a hack, but you can add motion blur to geonodes point clouds if you add an attribute called "velocity" to the group output node. This is seen by Cycles for motion blur. If you can work out the vector between the previous frame and current frame of each point and feed it into the velocity attribute, it does work. This is far from ideal, but can be a temporary workaround. Of course, I would much prefer to have this happen automatically!

blender-admin commented

2022-05-10 20:38:31 +02:00

This issue was referenced by 81b797af66

This issue was referenced by 81b797af669d21fc01855f94032faa6c92a4fd9b

Brecht Van Lommel commented

2022-05-10 20:56:37 +02:00

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

Brecht Van Lommel closed this issue

2022-05-10 20:56:37 +02:00

Brecht Van Lommel self-assigned this 2022-05-10 20:56:37 +02:00

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No motion blur with rendering pointcloud #97908