Hi, I've started playing with the new substance tools available with hou18 Side fx lab. It's really amazing. This got me thinking that it would be amazing if we could scatter decal textures on an object and bake it as a single texture. So I started playing around but the baker doesnt seems to consider individual image plane transparency when baking.
This is the kind of result I have in mind:


To simplify this I made a example with two grid. One using a shader with a constant blue color as diffuse. And an other smaller one containing a gradient.
This is the result in the viewport:


But when I bake this using the baker it gives me this:


As you can see where it should be transparent, it's black.

I've attached an example scene.

I tried a lot of different thing to make this work but maybe I'm missing something.

Thanks for your help.