Normal Map node gives strange artifacts #121166

New Issue

Marco · 2024-04-27T18:48:47+02:00

Marco commented

2024-04-27 18:48:47 +02:00

Blender Version
Broken: 4.1.1

Short description of error

The "Normal Map" node gives strange artifacts (it should look uniform) in this setup.

Exact steps for others to reproduce the error

Open Test.blend

**Blender Version** Broken: 4.1.1 **Short description of error** ![screenshot.webp](/attachments/00fb98ec-3171-4eb6-8ca2-cff6853c3920) The "Normal Map" node gives strange artifacts (it should look uniform) in this setup. **Exact steps for others to reproduce the error** - Open [Test.blend](/attachments/dab5ca97-1a95-462f-9616-e6655d399bb6)

screenshot.webp

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Test.blend

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Marco added the

labels 2024-04-27 18:48:47 +02:00

Gerstmann Bradley commented

2024-04-27 19:37:21 +02:00

The report should be simplified more properly.
I am not familiar with "normal map" node enough to say if this is a bug or anything.

The report should be simplified more properly. I am not familiar with "normal map" node enough to say if this is a bug or anything. ![image](/attachments/70154380-4bb4-4afa-9100-be5aec22a355) ![image](/attachments/52d854e8-1781-4b0e-ba89-97435673ab93)

image.png

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image.png

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Dmitry C. commented

2024-04-27 19:42:13 +02:00

~~You're applying a tangent space normal map with no tangent space.~~
~~Normally the shader uses the active UV channel to compute one, but a curve doesn't have UV channels.~~
~~Typing the name of the attribute in the Normal Map node should intuitively do the trick, but currently doesn't. Not sure if oversight or todo.~~
~~(note: can't do that on a mesh either - face corner attributes can't be selected on Normal Map node)~~

~~Alternatively, it's possible to switch normal map to world space mode, and compute tangents/bitangents manually, but that's quite a bit more involved.~~

Edit: actually, the fix is simple: change Store Named Attribute from "Vector" to "2D Vector", then it will be recognized as a UV Map properly

~~You're applying a tangent space normal map with no tangent space.~~ ~~Normally the shader uses the active UV channel to compute one, but a curve doesn't have UV channels.~~ ~~Typing the name of the attribute in the Normal Map node should intuitively do the trick, but currently doesn't. Not sure if oversight or todo.~~ ~~(note: can't do that on a mesh either - face corner attributes can't be selected on Normal Map node)~~ ~~Alternatively, it's possible to switch normal map to world space mode, and compute tangents/bitangents manually, but that's quite a bit more involved.~~ Edit: actually, the fix is simple: change Store Named Attribute from "Vector" to "2D Vector", then it will be recognized as a UV Map properly

👍 1

Richard Antalik commented

2024-04-28 04:48:51 +02:00

This seems weird to me. I wouldn't expect this to happen with the simplified case (not setting and using any attributes), but it does. But then when setting this attribute as 2D vector, but not using it anywhere it really makes UV mapping correct...

I guess I will confirm on this basis, but I also am not super knowledgeable in this area.

This seems weird to me. I wouldn't expect this to happen with the simplified case (not setting and using any attributes), but it does. But then when setting this attribute as 2D vector, but not using it anywhere it really makes UV mapping correct... I guess I will confirm on this basis, but I also am not super knowledgeable in this area.

Richard Antalik added

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Normal Map node gives strange artifacts #121166