The lttle cube with a shadow is not a Plugin! It'a native function of the Tools Bar Shadows of SketchUp for enable / Disable Shadows (from Location & Month / Day hours) Flowify can work with or without Shadows! Better if you post your SKP file (save as format "V 6") for a more large audience! Put also the adress of the video! From your alert message seems it's the "2 lines connection" who are missing! Here the concept : make the groups like this Group 1 = surface (Whitout hole) can be anything but "four sides" Group 2 = (2 straight lines) Group 3 = entiere wall (whithout hole) Group 4 = G1 + G2 + G3 Group 5 = flat window (or any volume) not obliged to be pasted to the surface! You select all Call Flowify "Projected window" is drawn (or any 3D volume) Here 2 examples : with a flat window (on the right, with a simple box on the left up corner) [image: Flowify.jpg] This are surfaces 4 sides fine working with Flowify! [image: fODf_surfaces_4sides.jpg] This surface will not work with Flowify! [image: 08NP_surface_4sides1.jpg]

Tap the relevant arrow once to toggle the lock on.

You can also improve the boolean functions with the new BoolTools 2 ! (20$) http://www.youtube.com/watch?v=N1HgNiwuq7Y

Wow! Great answer and solution! I'll try to redo the whole thing with your great advice. Hopefully I can get it to work. Thanks.

Thanks guys!! Solved it! Downloaded a Solid Inspector 2 which is the best! Fixed all surfaces and everything, it's finally Solid Group in Entity Info. Thank you all.

You have to install it from within SketchUp: https://help.sketchup.com/de/article/3000263#install-manual