Cycles point cloud ID get incorrect motionblur result #120153

New Issue

Fischer · 2024-04-02T04:22:40+02:00

Fischer commented

2024-04-02 04:22:40 +02:00

System Information
Operating system: Windows 11
Graphics card: RTX 4060 laptop

Blender Version
Broken: Blender 4.1.0

Short description of error

Geometry Nodes use ID attribute as way to define each unique element for procedurally-animated geometry. So motion blur interpolate elements with the same ID value. But as i know this work only for point cloud domain.

Originally posted by @mod_moder in #112061 (comment)

According to this issue, it seems that Cycles' motion blur recongnize point clouds by their ID attribute, but in my test, even if I changed the ID, Cycles' motion blur still regard them as old ones.

The point clouds in frame 47 and 48 have different ID attribute, they do not have any relationship in motion blur, at least they shoudn't...

Exact steps for others to reproduce the error
Open tst.blend and render frame 48.

**System Information** Operating system: Windows 11 Graphics card: RTX 4060 laptop **Blender Version** Broken: Blender 4.1.0 **Short description of error** > Geometry Nodes use ID attribute as way to define each unique element for procedurally-animated geometry. So motion blur interpolate elements with the same ID value. But as i know this work only for point cloud domain. > > _Originally posted by @mod_moder in https://projects.blender.org/blender/blender/issues/112061#issuecomment-1015859_ According to this issue, it seems that Cycles' motion blur recongnize point clouds by their ID attribute, but in my test, even if I changed the ID, Cycles' motion blur still regard them as old ones. ![test2.png](/attachments/c618d77d-e33c-43a0-9371-bb4f78f2129b) The point clouds in frame 47 and 48 have different ID attribute, they do not have any relationship in motion blur, at least they shoudn't... **Exact steps for others to reproduce the error** Open [tst.blend](/attachments/a938c1dd-23a8-4d71-b53a-82d7179b3abe) and render frame 48.

test2.png

1.6 MiB

tst.blend

1.0 MiB

Fischer added the

labels 2024-04-02 04:22:41 +02:00

Fischer commented

2024-04-02 04:51:33 +02:00

Here's a simplified version of the original blender file, which only have 1 point. The artifact also appears at frame 48.

Here's a simplified version of the original blender file, which only have 1 point. The artifact also appears at frame 48.![image](/attachments/5c83cb55-48d8-473d-a523-05a90e4c4b59)![image](/attachments/35a6cf61-632f-41ff-8a53-a471325b2863)

image.png

301 KiB

image.png

84 KiB

tst-simple.blend

1005 KiB

Pratik Borhade commented

2024-04-02 09:00:04 +02:00

Thanks for the report. Can confirm

Pratik Borhade added