Transparent material./ shadow catcher

[rangrstudio]

Hi all,

I'm wondering if it is possible to create a completely transparent material that only shows shadows from other objects. Basically, I'm trying to create a rendering that looks like a collage, with landscape elements and architectural forms floating on white space. I've set the background color to be white in the IBL settings, but it would be great to be able to have the ground be transparent and yet show shadows.

Any help greatly appreciated!

[nigec]

Any version of the Sketchup plugin, you enable the ground plane in environment , then change the reflections to 0, you can also add a white ibl color