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I'm trying to make like an exaggerated skid marks defect on extruded aluminum. I tried tangent input and noise texture, but the bump map is not working. I need it to be bumpy on the xz-plane if the extrusion is in the y-axis direction.

So my question is: why the bump map is not working?

I'm using blender 3.3 & Cycles renderer.

Screenshot Shader

Viewport

With base color white. ViewportWhite

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  • $\begingroup$ Are you sure? Unplug the texture from the Base Color input to see it with just the bump on solid white. $\endgroup$
    – TheLabCat
    Commented Oct 7, 2022 at 1:42
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    $\begingroup$ @TheLabCat I did that, no bumps. I just added the color for clarification. I tried to remove tangent, the bump map works fine then. Also tried tangent in geometry node, does not work too. $\endgroup$
    – topcat
    Commented Oct 7, 2022 at 2:00
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    $\begingroup$ Yeah, that's weird. The tangent vector seems to be causing the problem, but I don't know why - when it's used as a basis for (true) displacement, it works just fine - ibb.co/nsXLx59 - (The reason for the map range node in my setup is that though Noise textures are supposed to be in a 0-1 range, 98% of their values fall between 0.25 and 0.75). $\endgroup$
    – Christopher Bennett
    Commented Oct 7, 2022 at 2:58
  • $\begingroup$ @ChristopherBennett perhaps the pattern generated by the tangent + noise is not suitable (too regular) for whatever algorithm being used in the bump node. $\endgroup$
    – topcat
    Commented Oct 7, 2022 at 3:31
  • $\begingroup$ Yeah, that is incorrect AFAIK. They should be there. Check newer Blender versions. $\endgroup$
    – TheLabCat
    Commented Oct 8, 2022 at 1:52

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