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Rhino newbie questions


I am currently learning how to work with Rhino. I bought a one month subscription to lynda but the tutorials are explained with a windows version and I got a mac version.

Whenever i extrude a surface from a closed curve i should be able to get control points at the top of the surface just like i get control point at the base. I don't. I only get two control point at the end of perpendicular lines intersecting the surface. The tutorial shows how to do get control points at both ends of the surface but I don't know if I should do an extra step since I have the mac version.

Also, I can't select a curve on the mac version whenever it is in the same place as an edge or there are more than one curves. I do get the pop up box with the selection option but I can't select the curve after I click on the right option. What am I doing wrong?

Many thanks,