I am trying to achieve the following effect. Stones are falling towards some trees. But before the stones hit the trees, a shield appears and blocks the stones. The stones generate some shockwaves on the shield. At the moment I am using dynamic paint with a sphere (glass material) as the shield. The stones are the brush. The issue: I only want the glass material to be visible where the waves are. The rest of the sphere should not be visible. I was thinking about using the waves as a mask using a vertex color node. The problem is, there is no "wetmap" Output as it is the case when using "surface type: paint". Is there a way to use the waves as a mask? thank you!