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These would be isocurves. You can turn them off in the display settings of Rhino by setting them to zero width: Tools/Options/View/Display […]
Sometimes this can happen and I’m not sure why. The fix is use the rotateView command (or button) to get it back […]
Not currently, and probably not for quite some time.
You can’t import external shoe last CAD models exactly. What you can do is put them on a temporary layer and then […]