Surfaces will have to be tessellated into a triangular mesh before it can be shaded. The shading tolerance settings in the control panel controls the accuracy and fineness of the triangulation. A fine tolerance will create more triangles and will create a mesh which fits closely to the underlying surfaces.

Functions such as cross-sections, dynamic sections, Iso angle curves etc. which are basically ploy-lines, are also dependent on the tessellation accuracy. Below are two pictures showing the effects of tessellation on such functions.

Default shading tolerance.

The blue curves are iso-angle curves and green curves indicate the cross-sections with curvature plot switched on.

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