Thanks for the reply. I was referring to just the standard Alpha Channel. Some of the new "channels" for Presto sound a lot like support for Multi-Layer EXR's. Is this what you are referring to in the tech preview? Or are the light, shadow, reflection passes stored in separate image files (similar to how Unbiased and BSD Adaptive engines store alpha channels in a buffer now, but has to be saved to a file separately) ?giannis wrote:There are at least 2 issues with Alpha that we have in mind and are going to be "fixed". Also, note that we are working on multi-layer EXR saving, so as to pack all channels in a single image.
One thing that I need to better understand: do we need all channels/passes to use the alpha channel, when saved on disk[/b]?
Here is a reference to Multi-Layer EXR output in 3ds Max: