Geometry Nodes Sample Texture unable to multiply itself with Vertex Group Attribute #85500

New Issue

Dimitri Bastos · 2021-02-09T13:34:17+01:00

Dimitri Bastos commented

2021-02-09 13:34:17 +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 460.89

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-08 13:44, hash: f5c781af56
Worked: (newest version of Blender that worked as expected)

Short description of error
We have a Sample Texture Attribute and a Vertex Group Attribute. By doing some Attribute Maths, it would be expected to have both values multiplied (using Multiply operation), this is something really usefull for displacing vertex of a mesh (example). It doesn't work. However, the same approach using Distribute Points works.Sample Texture .blend

Exact steps for others to reproduce the error
As you can see on the attached Blend file, the node setup is already created, but it doesn't work. There are a Sample Texture, a Vertex Group Attribute multiplied with attributes maths and some vectors, but they are not interacting with each other.

Create a Geometry Nodes Modifier on a grid.
Create a Vertex Group.
Multiply the Vertex Group Attribute with a Vector.
Create a Sample Texture Attribute.
Multiply the resulting Vertex Group created on step 3 with the attribute created on step 4. It doesn't work with both Attribute Math and Vector Math.

**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 460.89 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-08 13:44, hash: `f5c781af56` Worked: (newest version of Blender that worked as expected) **Short description of error** We have a Sample Texture Attribute and a Vertex Group Attribute. By doing some Attribute Maths, it would be expected to have both values multiplied (using Multiply operation), this is something really usefull for displacing vertex of a mesh (example). It doesn't work. *However, the same approach using Distribute Points works.*[Sample Texture .blend](https://archive.blender.org/developer/F9749151/Sample_Texture_.blend) **Exact steps for others to reproduce the error** As you can see on the attached Blend file, the node setup is already created, but it doesn't work. There are a Sample Texture, a Vertex Group Attribute multiplied with attributes maths and some vectors, but they are not interacting with each other. 1. Create a Geometry Nodes Modifier on a grid. 2. Create a Vertex Group. 3. Multiply the Vertex Group Attribute with a Vector. 4. Create a Sample Texture Attribute. 5. Multiply the resulting Vertex Group created on step 3 with the attribute created on step 4. It doesn't work with both Attribute Math and Vector Math.

Dimitri Bastos commented

2021-02-09 13:34:17 +01:00

Added subscriber: @DimitriBastos

Hans Goudey commented

2021-02-10 02:19:26 +01:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2021-02-10 02:19:26 +01:00

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

Hans Goudey commented

2021-02-10 02:19:26 +01:00

I didn't figure this out after looking into it for a few minutes yesterday, so I'm going to call this a bug.

Miro Horváth commented

2021-02-10 12:56:27 +01:00

Added subscriber: @MiroHorvath

Miro Horváth commented

2021-02-10 12:56:27 +01:00

Displacing mesh via Attribute Sample Texture node doesn't work because custom data(in this case UV coordinates) aren't exposed as attributes(only Points created with Point Distribute node have it). So this is just a limitation rather than a bug, right?
As far as I understand this task https://developer.blender.org/T84297 should handle this problem and open another batch of possibilities.

Displacing mesh via Attribute Sample Texture node doesn't work because custom data(in this case UV coordinates) aren't exposed as attributes(only Points created with Point Distribute node have it). So this is just a limitation rather than a bug, right? As far as I understand this task https://developer.blender.org/T84297 should handle this problem and open another batch of possibilities.

Jacques Lucke commented

2021-02-10 17:15:12 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2021-02-10 17:15:12 +01:00

Since yesterday, (interpolated) UV coordinates can be accessed per point (without the need for a Point Distribute node). In todays build the file seems to be working as expected for me. Not sure if I'm misunderstanding the problem. Can you try again with the latest version?

Hans Goudey commented

2021-02-11 22:24:38 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Hans Goudey closed this issue

2021-02-11 22:24:38 +01:00

Hans Goudey self-assigned this 2021-02-11 22:24:38 +01:00

Hans Goudey commented

2021-02-11 22:24:38 +01:00

This is working now, I think I thought I had the domain interpolation patch applied on Tuesday when I tested last.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Geometry Nodes Sample Texture unable to multiply itself with Vertex Group Attribute #85500