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Old 14-12-2010, 10:01 AM   #6
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Join Date: Dec 2010
Location: Uk
Posts: 193

i think the dirt map was done in a tutorial I saw. They used a red point light overhead to cast light on the object. Then somehow took that information into photoshop and used it to create a dirty area in the texture. But wasn't sure if it was popular or even used?
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