I'm wondering if anyone can offer a hint on this as I'm trying to figure out how to create a transparency map within a VEX builder shader SOP... I've been fumbling around with it a bit but I'm fairly new to using the VEX builder.. I gather that it would be a texture passing through a composite SOP but can't seem to figure out how to input the variable for it to "subtract" which makes the texture map into a transparency map... don't know really where to start as I'm not seeing the subtract option