Quote - I think I used the math node because I also have a tendency to plug the texture into the ambient node sometimes (like, for eyes so the iris texture has an effect on the ambient glow), and the math node would allow both that and the mask.

Eh? Plug color into Ambient_Color, mask into Ambient_Value. Still no math node in that.

Quote - The math node is also useful if you have a black on white image, setting it to subtract to invert the image.

That's true but having a math node that does nothing, and justifying it with the argument that it could do something if you changed it to a different math function is - odd.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)