I know the title is kind of confusing, but I’ll try to explain.

I have a Starling background image that I would like my Dice to cast a shadow on without effecting the color on that background.

Right now I have a Directional light that casts a shadow on a Plane with a Colormaterial that is located on top of that background.

Unfortunately that colormaterial must of course have a color and doesn’t show a shadow if it is completely transparent.
That means the color of my scene is altered when I do it this way.

Is there a way to do this?

Thank you