Question - Flip Command

Occasionally, I have to import dgn files into Rhino. Some of the items will show the backface. I have to select each one and flip them. Takes hours. Is there a command or script that will take only these surfaces and flip them all in one swoop?


Backfaces are relative to the direction you are looking at them. Attached is a script that will compare the surface normals of selected planar surfaces to the view vector in the active viewport and flip them if necessary so that they “face” closest towards the viewer. Maybe this can help you…

–Mitch (1.3 KB)

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I’ll give this a try. Thanks for your help.