Raycasting and overlay materials

About a week ago I began a futile effort to create a clone of KSP-RP1 in Godot, with blackjack and hookers. Figured I'd start with procedural geometry like cones and cylinders, because if I get stuck on that then I can completely forget about quad-tree LOD planets where you can zip from human scale to orbit in realtime. Slowly working towards a 'craft editor,' but the entire thing is a pile of hacks already.