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How do you add surface imperfections?

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Message 1 of 6
Harris_Majeed
1008 Views, 5 Replies

How do you add surface imperfections?

How do you add surface imperfections like smudges or scratches onto a standard_surface? In my case, I'm trying to add scratches to a shiny metal surface.

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Message 2 of 6
lee_griggs
in reply to: Harris_Majeed

Are you using the scratches osl shader? If so, there is an example at the bottom here.

Otherwise, it's output -> specular_roughness

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 6
Harris_Majeed
in reply to: lee_griggs

If I do that, the metal will not have many specular highlights and won't look shiny. How do I preserve the roughness value so that the metal is shiny while also adding scratches using an image? I would not want to use a separate gloss map.

Message 4 of 6
lee_griggs
in reply to: Harris_Majeed

You can connect the file texture to a range or color_correct shader to control the results in the specular_roughness.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 5 of 6
lee_griggs
in reply to: Harris_Majeed

Can you share some images of what you are getting vs what you want? Here is a working example of a roughness map (MtoA).

6671-1586762436241.png

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 6 of 6
lee_griggs
in reply to: lee_griggs

Did you try the scratches osl shader?

Lee Griggs
Arnold rendering specialist
AUTODESK

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