I’ve been struggling with nodes the whole evening, not understanding why my cluster of particles would not get fully transparent. I just realized, by dragging over the output, that colors are like “1.500” and more. It seems Alpha 0 won’t really be Alpha 0 in these circumstances.
The problem is, I’m trying to punch a fully transparent hole in the particles based on an Alpha Mask.
What I have : a renderlayer with a fully transparent background and the particles (with colors going over 1.0 most of the time). An alpha mask in black and white.
What I need : a fully transparent background + the particles - the mask.
How do I go about doing this efficiently?