I’m trying to draw a curve, (that is actually a curve, not a straight line, which I believe Rhino also calls curves?). It’s an interpolated points curve that I’m drawing in a 2D viewport. I add all my points, then right click or press enter to end the curve and… it deletes.
This is about as simple as it gets, right? I’ve watched several hours of video and can’t even manage to draw a line in Rhino!!
Thanks for not laughing. 
OK, I worked it out. I had a applied cross section view (“Clipping plane”) to all my views and for some reason the curve was being drawn in the area that wasn’t visible, though it was visible whilst drawing it. I clearly have a long, long way to go…
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