ZBrushCentral

How i do this?

I want ot use Slice circle to make a perfect circular cut and create a new polygroup.

The thing is, the surface where i want to apy it is curved.

So when i do it, from my point of view the new cut seems to be a perfect circle. But if i move the camera around, i can see its not a perfect circle (because its following the geometry of the base mesh, wich is eliptical).

How i do this, please?

you physically can’t have a perfect circle on a curved surface from more than one view.