I'm trying to do splat mapping via vertex color data. Seems like this should be all fine and dandy, but channel mixer only accepts a vector3 or a vector4 (for RGBA mask).
Since vertex color can contain an alpha channel, I'm trying to use it as an input just like you'd use a splat map, but it seems like you can't create a vector4 with custom inputs, just manual ones.
There are 2 types of vector4 nodes but you can't assign values to any of them via nodes, only manually, and i don't understand why.
I tried to code it up, but i get a constant error code when i input it into the mask.
Error code http://pastebin.com/5i3XwDxf
Any help would be greatly appreciated.
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