Ok, what I need to do is sorta combine the additive and glow render modes of a sprite. I need it to be additive but also to be able to disappear once half of the sprite is cut off by a world brush(like in the glow render mode). I can't just use glow because glow makes it shrink and grow depending on your distance form the sprite, I want it to stay the same size.
I've seen this is several maps but I can't think of any right now, which is why I'm here and not decompiling.