Maximum number of attributes that can be used with eevee shading needs to be documented #108534

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SouvikBiswas · 2023-06-02T10:56:38+02:00

SouvikBiswas commented

2023-06-02 10:56:38 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 527.56

Blender Version
Broken: version: 3.6.0 Beta, branch: blender-v3.6-release, commit date: 2023-05-26 07:03, hash: e2a75814ac9f
Worked: This is the only version I have used

There are more than 20 parameters or attributes in my geometry nodes setup, and when I try to use those attributes in shader editor it doesn't update its values. Sometimes it updates when there is a viewer node connected.
[Please fill out a short description of the error here]

Its a big node tree and a lot of materials, so that's it.
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 527.56 **Blender Version** Broken: version: 3.6.0 Beta, branch: blender-v3.6-release, commit date: 2023-05-26 07:03, hash: `e2a75814ac9f` Worked: This is the only version I have used There are more than 20 parameters or attributes in my geometry nodes setup, and when I try to use those attributes in shader editor it doesn't update its values. Sometimes it updates when there is a viewer node connected. [Please fill out a short description of the error here] Its a big node tree and a lot of materials, so that's it. [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)]

SouvikBiswas added the

labels 2023-06-02 10:56:38 +02:00

YimingWu commented

2023-06-02 11:45:27 +02:00

Hi @SouvikBiswas Please try give us the file that replicates the issue, thanks! Shader should always update when the attribute values change. Is it the render result not changing? Or the names in the shader editor? Or is it something else? Could you describe the step by step replication and the behaviour?

YimingWu added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-06-02 11:45:39 +02:00

Philipp Oeser commented

2023-06-02 11:46:10 +02:00

This is limited by this code I think:

/* Hardware limit is 16. Position attribute is always needed so we reduce to 15.
 * This makes sure the GPUVertexFormat name buffer does not overflow. */
#define GPU_MAX_ATTR 15

@fclem , @Jeroen-Bakker : Assume this can be closed? Or kept as Known Limitation? Should be mentioned in the manual? https://docs.blender.org/manual/en/3.6/render/shader_nodes/input/attribute.html

This is limited by this code I think: ``` /* Hardware limit is 16. Position attribute is always needed so we reduce to 15. * This makes sure the GPUVertexFormat name buffer does not overflow. */ #define GPU_MAX_ATTR 15 ``` @fclem , @Jeroen-Bakker : Assume this can be closed? Or kept as Known Limitation? Should be mentioned in the manual? https://docs.blender.org/manual/en/3.6/render/shader_nodes/input/attribute.html

👍 1

Jeroen Bakker commented

2023-06-02 14:28:21 +02:00

This isn't a limitation of geometry nodes. But of the render engine. Eevee in this case. Best that https://docs.blender.org/manual/en/3.6/render/eevee/limitations.html should be updated as it doesn't reflect the attribute limitation. So the title should be updated and the manual.

Cycles and other render engines might have other limitations. After updating the manual we can file this issue as known issue.

This isn't a limitation of geometry nodes. But of the render engine. Eevee in this case. Best that https://docs.blender.org/manual/en/3.6/render/eevee/limitations.html should be updated as it doesn't reflect the attribute limitation. So the title should be updated and the manual. Cycles and other render engines might have other limitations. After updating the manual we can file this issue as known issue.

👍 1

Philipp Oeser changed title from ~~Maximum number of attributes that can be used with geometry nodes and shader editor.~~ to Maximum number of attributes that can be used with eevee shading

2023-06-02 14:35:38 +02:00

Philipp Oeser added

and removed

Needs Information from User

labels 2023-06-02 14:36:21 +02:00

Philipp Oeser changed title from ~~Maximum number of attributes that can be used with eevee shading~~ to Maximum number of attributes that can be used with eevee shading needs to be documented

2023-06-02 14:36:55 +02:00

Philipp Oeser commented

2023-06-02 14:38:09 +02:00

Hm, maybe this needs to be moved to https://projects.blender.org/blender/blender-manual then?

SouvikBiswas commented

2023-06-02 15:39:02 +02:00

Thank you all for the comments. I now understand that it is a problem with Eevee. Hopefully this changes later, but I don't know how that works. It works perfectly in cycles.
Thank you again

Thank you all for the comments. I now understand that it is a problem with Eevee. Hopefully this changes later, but I don't know how that works. It works perfectly in cycles. Thank you again

Iliya Katushenock referenced this issue

2024-02-07 00:52:23 +01:00

Hard Limit of 8 Instancer attributes for EeVe/ EeVe next - unclear if a bug or intentional #117928

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2024-02-08 06:56:03 +01:00

Object attribute node in material stops working from level of complexity(?) #117967

Jesse Yurkovich referenced this issue from blender/blender-manual

2024-02-08 08:19:28 +01:00

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2024-02-08 08:21:09 +01:00