How to create a curved surface on a rounded square?

You could also get level edges by changing the corners from arcs to curves that follow the intersection of a curved top and a horizontal plane at the desired height:

Not saying its a good design choice here, just that its possible…

Which two curves are you selecting for the RailRevolve here?
Or is that just a pure extrude?

there is this exact exercise in the level 2 manual

you can get this from help > learn rhino > tutorials and samples> lev 2 manual

it’s Exercise 7-1 Soft corners (part 1 and 2 )

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True! Thank you for teaching.


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