NgonulateMesh, but no help for it. I have no clue what it does, and I don’t know what are Ngons.
An NGon is an “N” sided polygon.
In version of Rhino prior to 6, meshes were limited to 3 and 4 sided polygons (faces). In Rhino 6, mesh faces can have any number of edges.
At the moment this appears to be limited to planar faces. Is the intention that there will be ngon faces that are non-planar?
edit: it does appear that non planar are possible but the command NgonulateMesh produces only planar ngons. Is this intentional?
What? How can mesh faces be non-planar?
3 points determine a plane. Any more than that and all bets are off. Even quads can be (and often are) non-planar…