Restrictions of the inner corner selection

Causes for the restriction of angle:

Restrictions of the inner corner selection 1:

In the graphic the TRC should be selected at the right hand side of the contour. With an angle about 180 degrees between the last and the first motion block of the contour the first point of the equidistant path will be determined with the direct method of TRC. This first point of the equidistant path is P3 in the diagram. The diagram clarifies that the staight line between the points P1 and P3 hurts the red drawn contour.

The angle designated in the diagram with starting angle may amount up to 180 degrees. In this range of angle the cotour is not damaged. The shown angle is larger than 180 degrees. The alternative point of selection P1* prevents this contour damage.

Notice

With injury of one of the restrictions an appropriate error is created.