OTOY Forums

It would be really useful to have backgrounds that instead of producing a solid alpha have a black alpha. That way the unprmultiplied files we end up with would be much more usefull in a composite. And those who don't want the transparent background can simply ignore the alpha. A checkbox in the environment tab (or even per material) that toggles the alpha of the background system would ofcourse be even nicer.

Hey, alpha is planned with non or multiplied options for the next 2.3...

Radiance

there's a easy work around that you can use right now.

1) Set your materials to pitch black
2) Set the environment to 100% white.
3) Invert picture in PS.

voilà...