Can I have a light affect only one material?

Questions & Answers
1

Some 3D rendering apps have checkboxes to allow you to say whether a particular light source affects a particular surface.

Is there any way I can do this with a material in Unity? I would like to have a spot light that only affects say the character’s clothing and not his face or hair or anything else.

Is this easily possible?

2

Look for “CullingMask” field in your light component.

There you can choose which layers are effected by the light.

To set the layer check out this:

http://unity3d.com/support/documentation/Components/Layers.html