PDL::Graphics::TriD::Rout man page on Peanut

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Rout(3)		      User Contributed Perl Documentation	       Rout(3)

NAME
	PDL::Graphics::TriD::Rout - Helper routines for Three-dimensional graphics

DESCRIPTION
       This module is for miscellaneous PP-defined utility routines for the
       PDL::Graphics::TriD module. Currently, there are

FUNCTIONS
       combcoords

	 Signature: (x(); y(); z();
		       float [o]coords(tri=3);)

       Combine three coordinates into a single piddle.

       Combine x, y and z to a single piddle the first dimension of which is
       3. This routine does dataflow automatically.

       repulse

	 Signature: (coords(nc,np);
			[o]vecs(nc,np);
			int [t]links(np);;
		       double boxsize;
		       int dmult;
		       double a;
		       double b;
		       double c;
		       double d;
	       )

       Repulsive potential for molecule-like constructs.

       "repulse" uses a hash table of cubes to quickly calculate a repulsive
       force that vanishes at infinity for many objects. For use by the module
       PDL::Graphics::TriD::MathGraph.	For definition of the potential, see
       the actual function.

       attract

	 Signature: (coords(nc,np);
		       int from(nl);
		       int to(nl);
		       strength(nl);
		       [o]vecs(nc,np);;
		       double m;
		       double ms;
	       )

       Attractive potential for molecule-like constructs.

       "attract" is used to calculate an attractive force for many objects, of
       which some attract each other (in a way like molecular bonds).  For use
       by the module PDL::Graphics::TriD::MathGraph.  For definition of the
       potential, see the actual function.

       vrmlcoordsvert

	 Signature: (vertices(n=3); char* space; char* fd)

       info not available

       contour_segments

       This is the interface for the pp routine contour_segments_internal - it
       takes 3 piddles as input

       $c is a contour value (or a list of contour values)

       $data is an [m,n] array of values at each point

       $points is a list of [3,m,n] points, it should be a grid monotonically
       increasing with m and n.

       contour_segments returns a reference to a Perl array of line segments
       associated with each value of $c.  It does not (yet) handle missing
       data values.

       Algorthym
	   The data array represents samples of some field observed on the
	   surface described by points.	 For each contour value we look for
	   intersections on the line segments joining points of the data.
	   When an intersection is found we look to the adjoining line
	   segments for the other end(s) of the line segment(s).  So suppose
	   we find an intersection on an x-segment.  We first look down to the
	   left y-segment, then to the right y-segment and finally across to
	   the next x-segment.	Once we find one in a box (two on a point) we
	   can quit because there can only be one.  After we are done with a
	   given x-segment, we look to the leftover possibilities for the
	   adjoining y-segment.	 Thus the contours are built as a collection
	   of line segments rather than a set of closed polygons.

AUTHOR
       Copyright (C) 2000 James P. Edwards Copyright (C) 1997 Tuomas J. Lukka.
       All rights reserved. There is no warranty. You are allowed to
       redistribute this software / documentation under certain conditions.
       For details, see the file COPYING in the PDL distribution. If this file
       is separated from the PDL distribution, the copyright notice should be
       included in the file.

perl v5.10.0			  2008-08-29			       Rout(3)
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