experimental pointclouds object bug with random value #114408

New Issue

Aery · 2023-11-02T15:03:17+01:00

Aery commented

2023-11-02 15:03:17 +01:00

System Information
Operating system:win10
Graphics card:rx 6500 xt

Blender Version
Broken: blender 4.1 alpha
Worked: -

Short description of error
using experimental pointclouds object, in geometry nodes when inserting random value to set position, the cycles viewport view3d rendering becomes devastatingly slow(some sec for 1 sample).
Switching to solid mode then back to cycles did make the viewport rendering fast again.
This does not happen when using mesh object.
Unconnecting the random value from set position makes blender unresponsive for awhile

Exact steps for others to reproduce the error

open the attached blend file
1.5 enable New Point Cloud Type in Experimental developer extras
switch to rendered cycles viewport
examine the rendering speed (samples per sec)
connect random value to position in set position node
examine the viewport rendering speed (some sec per sample)
switch to solid mode then back to cycles viewport
viewport rendering becomes fast again
unconnect random value from set position
blender becomes unresponsive

**System Information** Operating system:win10 Graphics card:rx 6500 xt **Blender Version** Broken: blender 4.1 alpha Worked: - **Short description of error** using experimental pointclouds object, in geometry nodes when inserting random value to set position, the cycles viewport view3d rendering becomes devastatingly slow(some sec for 1 sample). Switching to solid mode then back to cycles did make the viewport rendering fast again. This does not happen when using mesh object. Unconnecting the random value from set position makes blender unresponsive for awhile <video src="/attachments/049b4131-68a6-4f37-91ca-c7c80f3a47bf" controls></video> <video src="/attachments/512d2e7b-8f7e-470f-84db-2ff56e967566" controls></video> **Exact steps for others to reproduce the error** 1. open the attached blend file 1.5 enable New Point Cloud Type in Experimental developer extras 2. switch to rendered cycles viewport 3. examine the rendering speed (samples per sec) 4. connect random value to position in set position node 5. examine the viewport rendering speed (some sec per sample) 6. switch to solid mode then back to cycles viewport 7. viewport rendering becomes fast again 8. unconnect random value from set position 9. blender becomes unresponsive

pointcloudsbug.blend

24 MiB

2023-11-02 20-56-16.mp4

1.2 MiB

2023-11-02 20-55-46.mp4

2.0 MiB

Aery added the

labels 2023-11-02 15:03:18 +01:00

Germano Cavalcante commented

2023-11-02 16:06:48 +01:00

Thanks for the report, @FieryAery. I can confirm the issue.

In fact, performance is greatly impacted when connecting the output of the Random Value node to the Position input during viewport rendering.

Cc. @brecht

Refs.
#92573: Cycles: point cloud geometry improvements
#75717: New pointcloud object type

Thanks for the report, @FieryAery. I can confirm the issue. In fact, performance is greatly impacted when connecting the output of the `Random Value` node to the `Position` input during viewport rendering. Cc. @brecht Refs. #92573: Cycles: point cloud geometry improvements #75717: New pointcloud object type

Germano Cavalcante added

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experimental pointclouds object bug with random value #114408