It depends on what you want to do.
You'll need to specify which layers you want to be masked, which blending mode you want each layer to use, which layers to want to be able to adjust the alpha on, which layers have alpha, and which layers you want to be affected by light.
If you want masks or alpha and want it to be affected by light, you need to create a second surface with the same polygons and turn on the vertex alpha flag for the surface.
I gotta go eat dinner though so I can't explain more right now.
You'll need to specify which layers you want to be masked, which blending mode you want each layer to use, which layers to want to be able to adjust the alpha on, which layers have alpha, and which layers you want to be affected by light.
If you want masks or alpha and want it to be affected by light, you need to create a second surface with the same polygons and turn on the vertex alpha flag for the surface.
I gotta go eat dinner though so I can't explain more right now.