I've been modeling in sketchup and rendering in 3ds MAX for years. Trimble broke a feature of the .3ds export in 2015 (export only current selection does not export material by layer) and they've ignored every request I've made to have this fixed. The work around is I have to export the entire model, or hide geometry on hidden layers. Maybe if more people used this workflow Trimble might fix the issue. Attached is my script for importing and updating sketchup models in MAX. It's a very streamlined process, that allows changes to the sketcup model while maintaining materials and modifiers applied in max.
sketchup-max3.3.txt (13.3 KB)