When I render it using Maya Software and all channels it looks fine but when I use alpha channel the entire screen is white (not just the object which I know should be a white outline) I have 4 lights (1 area and 3 spot lights) with depth map shadows turned of for all of them. The background is a very basic box consisting of 5 planes. I also have alpha channel (mask) turned on in the render settings. Please help me.