Chord Height Tolerance

Chord height tolerance is the value that is allowed between a surface described by the BREPs (boundary representations), and the polygons that are produced by the tessellation process to approximate that surface. That is, between an edge and its tessellation. A smaller chord height tolerance causes more polygons to be produced, creating smoother models. The units are expressed as unit size based on those used by the model.

In the images below, the first has a chord height tolerance of 0.5, and the second has a tolerance of 0.05. The first image displays a roughly approximated surface curve. The second image contains many more faces than the first and therefore displays a smoother approximation of the curve circumference.