Graphics Reference
In-Depth Information
4.
At this point, the Ambient Occlusion layer can come in handy once again. Unhide the layer and in-
vert it. This can be used as an alpha channel by dragging it on to the Dirt layer.
5.
Set the Dirt texture's blend mode to Multiply, and it should be ready to go.
Figure 12-20
shows the
result on the blank scene.
Figure 12-20:
Dirt with an Ambient Occlusion mask (alpha) creates grime in areas of the geometry
where grime would likely gather.
