Corona Scatter Overlap

[Image Box Studios]

Hello Guys.

We are using Corona 2.0. We need your help. Please see attached image.
Grass is overlapping concrete slabs. How can we remove grass from concrete slabs. We added black/White map in "Surface Scattering".

Thanks in advance.
 

[maru]

This question seems to pop up quite often recently. :)
We don't have any kind of "auto cut" option, but here are some ideas: https://forum.corona-renderer.com/index.php?topic=21660.msg133335#msg133335