EllinorFo

Hi! I have some problem when I try to activate the mounting surfaces on my 3D model (dae-format from SketchUp). The buildning has two roofs at different levels which I want to place panels on. However, after importing the 3D model and pressed "edit" --> "Determine mounting area automatically" only the walls of the buildning and the top roof gets activated. The lower roof (which is the biggest one) dosen't get highlighted or open to continue to design/place panels on. Is there any way to manually choose which areas that activates? I would be very thankful if someone could help me woth this problem.