Floor plan can dip under mesh, implying it has holes when it doesn't

Currently when you add a floor plan one of the main things you're looking for are holes, but since sometimes the generated mesh can go under the surface of the mesh you're working with, it's unclear if that's a hole or not. So we should do something to make it possible to see the full generated mesh -- either always render on top or reduce other meshes' opacity for example.

Start by reproducing the floor plan view in the Spoke editor and inspect how the generated mesh and surrounding meshes are rendered. Compare always-on-top rendering with reducing other meshes' opacity; done when the full generated mesh is visible enough to distinguish actual holes from mesh intersections.

Written by the indexing model from the issue text.