Lang,




Here's the way I tried it:

1) Create at Square with rounded corners and your circle.
2) Enter the "Rebuild" command to re-create you rounded square to become one path.
3) Extrude the circle and square
4) Blend between the two surface edges.

Since each edge will be composed of one curve, Blend should tangent the surfaces nicely.


One of the many ways you can attack the problem with MoI