Hi, I have a problem or lack of knowledge on this particular area, I'm rendering out my scene, but the only issue is that my alpha channel is coming up solid black, as opposed to transparent and I have no way of keying it out or don't know of such a method in photoshop or AE, such that my background layer is invisible under this. I have a hdri lighting set up in maya, maybe this is causing it?
Bit more info, the problem dissapears with the beauty and master beauty render passes, but for shadows, spec, indirect, diffuse, the black un-removable background appears. I'm rendering it out as TGAs.
Just for anyone who may have the same problem the solution is simple, if you know where to look, double click on your render passes, eg beauty, spec etc, which will bring up a menu screen in the attribute editor, the channels for each pass are set to 3 by default for some unknown reason. Set them to 4 and you'll get your alpha channel.