Geometry Hierarchy

If a BOX, PYRAMID, CYLINDER or EXTRUSION is recognized by ImPLANT-STL, then these primitives are added to the EQUIPMENT or VOLM element. Negative primitives are added below these primitives.

Any Solid Polyhedron (POLYHE) elements are also created directly under the EQUIPMENT or VOLM element.

Any other closed volumes that are not recognized as being any of the above PDMS primitive types are added to the EQUIPMENT (or VOLM) element as a SUBEQUIPMENT (or SVOLM). Each face with one or more holes in it is represented as an EXTRUSION with each hole represented by a NEXTRUSION. All remaining faces, with no holes, are represented by PDMS POHEs, each face of a POHE being represented by a single POGO (polygon) element. The POHEs are added under the SUBEQUIPMENT.

All non-closed volumes are split into non-manifold surfaces. Each non-manifold surface is then treated as a closed volume as detailed previously.

The geometry hierarchy is as shown in Figure 7-1.

Figure 7:1. PDMS Geometry Hierarchy