Could be I have completely missed how this is done, but I often find i need the same feature as in the scanline matte material; that is to include the reflection of, say a character, on the floor that is set to matte. With this I also mean that it affects the alpha channel, so it can be comped directly.
Please correct me if I’m wrong and this is already possible.
I’ve been asking for that one for a long time!
V Miller
soon my friends…
has this been implimented in 1.5?
Is it possible now with 1.5? I can’t figure out how…
Reflecting the alpha channel is currently not implemented, but it is in the to-do list.
Best regards,
Vlado
Good to know, I have a project in development which would benefit greatly from this feature 
vlado, please put it as number 1 on your to-do list
/Thomas
Hehe, I have about 20 number 1’s already But I’ll get there sooner or later.
Best regards,
Vlado
I can get this working if I dont use an alpha and instead use an additive reflection layer. Then I have to overlay the actual object and shadow layer with alpha above this. Seems to work fine.
My problem is getting something to render behind glass. Im very close but the alpha of the object behind the glass doesnt refract. If it did, I could then get my objects diffuse refracted and with reflection in front and overlay this into my scene.
I have been having a lot of problems using this method with saved lightmaps. It really messes with all of the alphas ???