Create new geometry based on Occlusion output

Hi everyone,

I used the Occlusion component in the Mesh group to generate a shadow of an shape that I defined on a mesh surface on the xy plane. Now I want to use that information to generate a new geometry. What I got so far is to use the H output of the Occlusion (I only have one ray so it would be either 0 or 1) as the the boolean for dispatch and output the group of vertices on the mesh that have the shadow on. Now I'm stuck at how to use those points to either make a surface or mesh out of them. I tried 2d Proximity but what I got are lines and I don't know how to work with them either. If you have worked this out before or got an idea please help me out, thank you so much!