Hi there again,
I came across a wierd render problem. I've got a particle simulation and everything is working fine. My particles are blobby surface and I'm using the dielectric material. When I render in maya to check I get an image (1st attachment) when I batch the whole sequence there is a hole where my particles should be... Same problem with mia material. When checking the alpha in maya render window I noticed that it doesn't exist for my particles, but the alpha channel is checked in render globals?
any help would be great thanks