block silhouette: easy with one mesh, how to do with submeshes?

Hi,

I implemented a silhouette effect so that objects behind an obstruction gets rendered with a solid silhouette in the parts that are obstructed:

http://screencast.com/t/awfeytnK
(White silhouette = friendly unit, Yellow silhouette = enemy unit)

This was simple for single-mesh objects because I could just add passes to my MeshRenderer:
0 - pass 1 (stencil set)
1 - pass 2 (diffuse, clear stencil)
2 - pass 3 (opaque postpass, stencil test)
(each have their render queues set explicitly either in the shader or material)

However, we're starting to add units with more than one mesh. By default they're showing up like this:
0 - submesh1
1 - submesh2

And I need to make all submeshes be able to silhouette against obstructions. If I arrange my materials like this:
0 - submesh1 - stencil set
1 - submesh1 - diffuse
2 - submesh1 - opaque post pass
3 - submesh2 - stencil set
4 - submesh2 - diffuse
5 - submesh2 - opaque post pass

Would this even work? How would I tell Unity which prepass or postpass is associated with which submesh?

Would this work?

0 - submesh 0 - diffuse
1 - submesh 1 - diffuse
2 - submesh 0 - stencil set
3 - submesh 1 - stencil set
4 - submesh 0 - opaque post pass
5 - submesh 1 - opaque post pass

Thanks in advance,
Jeff

 

Apparently this is something that people have asked clarification on:
http://answers.unity3d.com/questions/38414/multiple-materials-for-multiple-submeshes.html