Tips and Hints

• It is easy to generate input files that take an excessively long time to run. This is probably the most common pitfall. The run time increases with increasing segment count. The segment count is approximately proportional to the number of lines in the input file.

• Non-Manhattan features can be very bad news. These are ``Manhattanized'' by converting non-Manhattan edges into stepwise approximations. The large number of edges that can be produced by this may lead te excessive run time. The FhManhGridCnt entry in the Params page of the control panel can be decreased to reduce the number of segments.

• Too-few segments is also to be avoided, as the calculation may not be suitably accurate. The Volume Element Refinement check box in the Params page should always be checked. The entered number can be varied, the user should experiment. Larger values should provide better accuracy at the expense of longer computation time.

• One should not try to extract ``too much'', due to the FastHenry limitations. How much is too much depends on a lot a factors, the user should experiment to gain a feel for their process and computer hardware.