Dirt Maps

[Matt Sugden]

Do any of you create your own, and if so whats a good technique, or do most of you just buy them?

[Tim Saunders]

I depends on how close to the dirt my camera is in the scene. Yesterday I did a render that has a steep dirt hill as the foreground. I grabbed a couple on line and tried to match their color in photoshop, then mixed them in viz/max with a smoke mixture to escape tiling. Then I gave it about 1 inch of vray's displacement and it turned out okay. Not sure what program you're using, but you might try a similar method.

[Nic H]

To make dirt maps I usually just get a concrete or dirty scratched metal bitmap and open the texture I want to dirty up in photoshop then use blending modes and opacity changes to overlay the two till its dirty enough.

 

You might want to try a mix map as well with a noise mask and a slighty dirtier version of the same tex and fiddle around till you get a beleiveable result. I find making custom textures quicker though.