I’ve worked a little more about the Solar Position definition I’ve started here. The definition uses Danel da Rocha’s beautiful solar position script and utilizes it with other components. It creates visual output for any given surface, divided into quads (with side faces of course) and coloring according to their orientation to the sun. This time (file here: [GHX: 0.8.0066]) I added an occlusion part to calculate the surface’s own shadow. Now, the solar calculation takes surfaces as obstacles and dispatches the occluded faces from visualization, leaving them grey. Of course, it sometimes sees the back face of the surface, you should add any obstacles you want to be calculated to the occlusion component (converting them to mesh).