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Geometry testing is also possible when generating line-drawing pictures and is also enabled with Test; in this case, the Test option works only when the TRACE option is also ON. Geometry checking while in line-drawing mode increases computer time. The checking time can be reduced by using drawsets to examine subsets of the model at one time. For large complicated geometry models, use of the ray-tracing geometry test with COLOR or ETCH is much more efficient than checking with DRAW or RDRAW.
When error checking in the line-drawing mode, the zone/cell transparency table is ignored, and the entire geometry is assumed to be transparent. If errors are discovered in a portion of space, that space will appear as opaque and hide the lines behind it, thereby giving a clue as to the location of the error. As with errors detected during ray tracing, messages are written to the file errfile.txt. The spatial line plot is very helpful when a volume of space has not been defined; the plot then clearly indicates where the error exists. The errfile.txt messages are more helpful, the line plot is of less use, when a volume of space is overdefined. In the latter situation, the COLOR plot is more informative.
Thorough testing of a geometry model with line drawing requires viewing the model with Test mode ON and TRACE mode ON from several different perspectives. This allows Sabrina to track the geometry with a variety of trajectories. The testing of large complex models can take a while.