Hi I have a texture already applled to an object but now I want it give it some dirt what would be the easist way for me to do this? thanks
Take a bitmap image with a very dark alpha channel, and put it on your object using a mix2color node. Use the alpha channel (with a Pick_Channel node) to weight the dirt layer.
Does this make sense?
Hope this helpsSalutations - CheersBernard Lebel
That works, but IMO my solution is better: Open up the shader window for your material and right-click on the little icon next to the color channel and select "blend with->image" Pick your dirt texture, www.dvgarage.com sells a package called surfacing toolkit which is really great for making grime and dirt. Now, open up the rendertree with your object selected and click on the "diffuse" node. In there simply change the blending mode to "hue offset (overlay)" This should make the dirt more integrated onto the surface than using a alphamask. Remember that the dirt texture works best if its in black&white.