Easiest way to render just an alpha channel?
Hello, I'm using mentalray and I select under framebuffer a filetype which is just an alpha but it's like Maya ignores my command and apparently renders an RGBA image anyway.
I want to have the ability to batch render images with different alpha channels with an absolute minimum of render time (and usage of hard drive space). What's the most simple way to do this?
Thank you in advance!