Transfer of Holes

There is a limitation as to which holes are exported. Only secondary PLOO boundaries and NXTR elements can be handled as well as NBOX and NCYL under certain conditions. PLOOs are full depth penetrations: partial penetrations can be modelled using NXTR elements. Circular boundaries of holes and indentations can be imported and exported if recognized as such, by having 4 unique fillet vertices.

On import, vertices in boundaries are given a DESP value.

Using these values, specific shapes can be detected, For example circles or ellipses.

A message is output when the export process ignores most non loop-based negative primitives. It is difficult to determine the geometric intersection with the PANEL, especially if the primitive axis is not perpendicular to the plate plane. In the future it may be possible to handle some of them, but still only within tight geometrical constraints. Negative boxes and cylinders can be transferred only if a principal axis is parallel to the plate's normal. The cylinder's Z-axis, and any of the box's X, Y or Z-axis must be parallel to the plate normal. We even have to limit NXTR elements those with an extrusion vector parallel to the panel plane normal. Some negatives are not exported at all:

Imported holes are either NXTR or PLOO elements. A full penetration is a PLOO, and a partial penetration is an NXTR.

Any other negatives are not compared or merged on import. Other pre-existing negatives are moved and updated to maintain the original position and orientation.