Normal map provided with cube model is in a tangent space of OpenGL style?

[wojtekpil]

It seems that provided normal map textures for tutorial 11 are using tangent space of OpenGL style. WGPU uses coordinate system of D3D & Metal so results seems to be incorrect. I tested it with white diffuse texture:

And here is a result with Y channel inverted of normalmap (D3D normalmap):

Its less noticeable with diffuse texture.
Original (opengl):

D3D converted:

I couldn't test it with provided demo source code (some weird crash I need to investigate), so it could be mistake in my code, but the issue is similar to what we can see in images from tutorial.

[sotrh]

You are correct. Another user pointed this out in #313. Do you know of any tools that can convert the cube normal textures to the correct handedness?

[wojtekpil]

Oh, you are right, somehow I didn't notice this issue. Usually I am using open-source material-maker. You can use this node setup:

Probably there are easier methods, but I am using material-maker for procedural textures so I am used to it.