Handling Complicated Models

Some complex models require special consideration.

RAM Settings for Very Large Geometries

Click Modeler > Support Large Geometry Import to reduce memory during file I/O and other operations for very large imported geometry. This is only necessary in exceptional cases.

Object Overlap Settings for Complicated Models

Complicated geometries often have small object overlaps. Click Q3D Extractor > Design Settings to allow overlaps between dielectrics and metals. In the overlap region, the metal will locally take priority over the dielectric, as if this part of the dielectric has been subtracted. Overlaps between two dielectrics and overlaps between two metals are still not allowed.

The Set Material Override dialog box appears. Click Allow metals to override dielectrics if you want some intersections to be resolved automatically in the mesh. If metal intersects dielectric, the metal overrides the dielectric in the overlap region. (That is, the metal object is subtracted from the dielectric.) If objects with the same material overlap, the small object overrides the larger. (That is, the small object is subtracted from the larger.) All other intersections are treated as errors. Normally, the modeler considers any intersection between 3D objects to be an error.

In the meshing process, the dielectrics are locally overwritten by the metals in the intersecting region. That is, the part of the dielectric that is inside the metal is removed, and if the dielectric is completely inside, the whole object disappears.

This feature allows you to avoid doing explicit subtraction in the modeler. One example application is a via that passes through many dielectric layers. With the option turned on, the via does not have to be subtracted from the layers.

Post-Processing for Complicated Models

Under Tools > Options > General Options, on the Miscellaneous Options tab...