Working in a studio where Rhino and Sketchup are both used, there is always a need to translate geometry back and forth, so the Sketchup exporter is essential. It is so close to perfect yet the triangulation is a dealbreaker.
Btw, testing Rhino dwg export to Sketchup instead of direct-to-sketchup, with merge coplanar surfaces checked, and the result in Sketchup is different. When turning on hidden geometry with the dwg import and there is no surface triangulation (and the geometry is fully editable).
Hi Pascal - merge coplanar faces lives in Sketchup in the dwg import dialogue. I find that importing Rhino geometry in dwg format eliminates the triangulation issue (but as mentioned the other negatives with dwg import remain). It would be ideal if the Rhino SKP export could have this option. Would love to try it in the Rhino 7 WIP. Let me know! Thanks.
Pascal - here are a few screenshots (sorry for the bad writing). This is a simple box exported via Rhino SKP exporter and imported (or opened) in Sketchup. It looks ok at first glance but when you try to work with the geometry you find that the extruder (push/pull command) fails since each rectangle is actually two triangles. If you go to View in Sketchup and check show hidden geometry, you see what this second screen grab shows - the dashed lines are the actual face divisions. Unless you delete the hidden division lines, the geometry is almost impossible to work with. Btw, I am not working in Rhino in meshes, only nurbs surfaces.
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I should mention, too, that while Sketchup hates nonplanar surfaces (as you noted), as long as the originating Rhino surfaces are in fact planar they should not be triangulated, as the current SKP exporter unfortunately does as a default action.