A convex surface, body, part, or line.
The convex surface of that stone has the mark of dragon.
With the viscosity solution of Eikonal equation, a method is proposed on the 3D reconstruction of convex surface based on an image. Then, the additive saddle surface and multiplicative saddle surface are defined.
a plane with a flexible face that can plane concave or convex surfaces.
The increasing Rotation number weakens curvature effect on convex surfaces, while strengthens curvature effect on concave surfaces.
