Trying to set transparency on the viewer Node First time posting in blender but it's important. Thank you for your support.

I have a model which have a Mix Shader with Glass and transparency shaders mixed, both with a texture as Color.

When I use the nodes for compositing, the glass of the model doesn't transparent with the background. If I set to Multiply, all the model multiplies and I can see through the glass, but cannot with Mix.





Someone can help me with these? Any advice for handle those situations? Thank you very much.
You don't need an ID mask, just use a transparent background for your scene and then composite using alpha over.

Enable film transparent,



Then use alpha over to combine the rendered image with the background:



The transparency from the glass should work fine.