First off - I have read and tried to implement the anssers here and here plus a fair amount of googling but I'm still puzzled.

I'm trying to add scratches to an existing material provided by the Ldraw importer


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Attempting to add scratches I've done this:

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with absolutely no result.

While I got the hang of showing scratches if I start from nothing (pun barely avoided), I am stuck with adding them to this material.

How do I do that?


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