I am working on rhino 7 . I have imported model which has disjoint polysurfaces as one open polysurface. also grasshopper detects this geometry as one open polysurface. not able to get individual area for object.
The command is called CreateRegions. Rhino V7 does not have the option to delete the originals, i.e. it makes a copy of the individual polysurfaces contained in the disjoint polysurface and leaves the original. The V8 WIP does have this option.
Hmm, if you run the script on his objects it produces 3 non-manifold polysurfaces instead of the 6 manifold polysurfaces I expect. CreateRegions does correctly produce 6 closed manifold polysurfaces but leaves the original disjoint object.
Also @pascal, @chuck, in the WIP, the DeleteInput=Yes option does not actually seem to be working (on this file at least).