Prismatic Geometry Limitations

Here are some areas where the Prismatic Geometry setting can have no effect. These areas are output as they would be if Prismatic Geometry was unchecked.

Surfaces which although prismatic,
have complex trimming or boundaries.

Nearly-flat areas, such as near the
tops of domes. (This produces tolerancing
problems for Prismatic Geometry output
which is based on 2D tolerancing.)

For these areas, you could also check the Line Arc and/or Spline options for NC Output Smoothing (General tab).