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SHAPEFACT(1)			    BRL-CAD			  SHAPEFACT(1)

NAME
       shapefact - obtain shape	factors	between	named regions of mged database

SYNOPSIS
       shapefact model.g objects...

DESCRIPTIONS
       Shapefact is an interactive program used	to create a file containing
       shape factors between all regions of the	named objects. The shape
       factor from region i to region j	is the fraction	of total energy
       radiated	from region i that is intercepted by region j. This file can
       be used with the	enhanced engine	model developed	by Jim Rapp at BRL for
       use in the PRISM	thermal	simulation.

       Air must	be explicitly modeled since shapefact will only	calculate
       shape factors between regions separated by engine air (air code of 5).
       Shapefact uses a	Monte Carlo simulation,	so increasing the number of
       significant digits in the answer	by one requires	about one hundred fold
       increase	in the number of rays fired.

EXAMPLE
       The following is	an example from	an interactive session.

		$ shapefact sph.dsk.g all.air
		Enter type of file to be written (0=>regular or	1=>generic).  0
		Enter name of output file (15 char max).
		     sd.sh.reg
		Enter the name of the error file (15 char max).
		     sd.sh.err
		Enter the region # & name file to be read (15 char max).
		     sd.f.rnn
		Do you want to dump interm shape factors to screen (0-no, 1-yes)?  0
		Enter number of	rays to	be fired.  5000000
		Do you wish to enter your own seed (0) or use the default of 1 (1)?  1
		seed initialized
		Number of regions read from region # & name file:  4
		Database Title:	 sphere	& disk for use with shape
		Number of regions:  4
		1000000.000000 rays have been fired.
		2000000.000000 rays have been fired.
		3000000.000000 rays have been fired.
		4000000.000000 rays have been fired.
		5000000.000000 rays have been fired.
		Finding	correct	region numbers.
		Finished finding correct region	numbers.
		$

CHANGES	SINCE BRL-CAD RELEASE 4.0
       1. The region number and	name file is read so that the numbering	of
       regions is consistent across all	irprep programs.

       2. A generic output file	may now	be written.

       3. An error file	is written.

       4. The format of	the output file	has been changed.

SEE ALSO
       firpass(1), secpass(1), all_sf(1), showtherm(1),	ir-X(1), ir-sgi(1),
       pictx(1), pictsgi(1), User's Manual for IRPREP (BRL-SP-96), Computer
       Programs	for Generating an Input	File for PRISM and Displaying PRISM
       Results (BRL report in progress)

AUTHOR
       Susan A.	Coates

COPYRIGHT
       This software is	Copyright (c) 1991-2013	by the United States
       Government as represented by U.S. Army Research Laboratory.

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       <devs@brlcad.org>.

BRL-CAD				  07/08/2017			  SHAPEFACT(1)

NAME | SYNOPSIS | DESCRIPTIONS | EXAMPLE | CHANGES SINCE BRL-CAD RELEASE 4.0 | SEE ALSO | AUTHOR | COPYRIGHT | BUG REPORTS

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