render image alpha

[Sunshine19980919]

How to specify the alpha of the background of the rendered image

[bottler]

You can do this with a custom shader. Each of the built-in PyTorch3D shaders should be simple to copy to your own code and adapt.

[yougrianes]

What do you want to specify? I met this problem before and I make the alpha channel into binary image, and my problem solved. :->
But I'm not sure whether is the same problem with yours.