Interior Faceting Explanation

Tools are represented by a series of facets. This is to reduce the data processing required. (The illustrations below are 2D simplifications, actual tools, such as ballnoses, may have 3D profiles):

Normally the facets are arranged to minimise the approximation error, so the representation is both inside and outside the actual tool profile.

With 'Use Interior Faceting' checked, the representation is wholly within the tool profile, and the points coincide with '3 o'clock',' 6 o'clock' etc.

 

The 'interior faceting' will give a more accurate simulation in 2D situations where cuts are orthogonal, when the cutting will be 'on the points':