Menu: View->Curvatures->Surfaces
Draw a contour fill of the curvature of all visible surfaaces on each point and a scale of colors to represent its values
Definition of the surface curvature at a point:
For two-dimensional surfaces embedded in R3, consider the intersection of the surface with a plane containing the normal vector at a point and another arbitrary vector tangent to the surface. This intersection is a plane curve and has a curvature. This is the Normal curvature. The maximum and minimum values of the normal curvature at a point are called the principal curvatures, k1 and k2, and the extremal directions are called principal directions.
It is possible to draw some typical surface curvatures:
...
Also the principal curvature directions can be shown as unitary vectors.
Menu: View->Curvatures->Curves >Curvatures→Curves
Draw by colors the curvature (the inverse of curvature radius) of all visible curves.