Hi 3image - the circles in MoI actually combine both of those types you are talking about in Rhino.

When you draw a circle in MoI, it will be the exact non-approximated one like the one you show on the right.

When you turn on the control points of that circle, it will at that time set up a companion deformable circle and show you the control points for the deformable one. The exact circle will only actually be replaced by the deformable one if you move any of the points though. If you just turn off points without editing any of them the circle will remain as the exact one.

At some point in the future I'll probably have an option in a properties dialog to enable or disable this "auto conversion to deformable" and to control how many points the deformable version will have.


> If not, why? It's even not possible to import those circle from Rhino into MoI.

They will get imported fine - the circles that you import from Rhino will be exact circles in MoI too, just when you turn on their control points you'll see the control points of the deformable version.

The reason for this behavior in MoI is that editing the control points of the exact circle usually surprises people since it will introduce sharp corners in it.

- Michael