This is article II of a two part series on Geometry Errors.  It is recommended that you first read “How To Locate Geometry Errors” prior to working through the examples provided in this article.

As is outlined in part I, there are 3 common reasons for Geometry Errors.  Each of these is outlined once again below, with their respective reference page numbers.  You may follow the examples sequentially, or you may advance to the desired example by selecting the appropriate page number in the table below.

 REASON  DESCRIPTION  PAGE
#
INVALID PLACEMENT OF ENTRY & EXIT PORTS Neither the entry or exit ports may intersect with any objects in a Non-Sequential Component (NSC) group.  Nor can the exit port be in direct contact with a surface of a Non-Sequential (NS) object.  It is important to ensure that both the ports are separated by at least the glue distance from any of the objects in the NSC group.  2
INVALID PLACEMENT OF SOURCES Sources can exist inside of volume objects, but they must be specified as such using the "Inside Of" flag in the NSC Editor. Sources may not straddle boundaries of volume objects. Misplaced Source Objects will result in geometry errors.  5
INVALID CONSTRUCTION OF SOLID OBJECTS Sometimes, user defined objects, such as Polygon Objects or Imported Objects, are improperly defined. For example, if a Polygon Object is not fully enclosed, ZEMAX cannot determine when a ray left that object and will issue a geometry error.  7