Hi all. Got a bit of a problem with a material i need that i just can't for the lif of me figure out.

I tried making this work a while ago and haven't really tried since giving up back then.

Basically i want a material for vertex painting and with Z axis placement.
I can do both vertex painting materials and Z axis placement materials. But i cant make a material that can do both.
The idea is that the material will allow to paint on several different textures and have triggered snow and rain.

https://dl.dropbox.com/u/22925394/UDK/M_World.upk

Thats the material as it is at the minute. It is supposed to lerp between 4 different textures, which it does fine, until i add the snow setup.

I have a feeling that it doesnt work because the green channel is already being used prior to being used for the snow placement. If that is the case i have no problems with dropping one of the vertex channels and using it for snow instead. But i still can't get this working.

If anyone could help I'd really appreciate it. I'm literally at my wits end trying to figure out a way to do this.

Thanks in advance people.