I have a problem with adding hair particle system (grass) to mesh imported from ArchiCad. I need emiter which is simple 2d plane, so grass would grow only up, but this is object with normals pointing in every directions. I have tried intersect it with a new plane, but nothing happend (cannot execute boolean operation error).
Maybe there’s a way to convert 3d object into 2d in similar way it can be projected into flat uv map?
Blend file attached.
ground.zip (308 KB)