bdy(3gv) [debian man page]

bdy(3gv)																  bdy(3gv)

NAME

       bdy - boundary curve finder

SYNOPSIS

       #include "bdy.h"

       Geom *Bdy(Geom *, float prec);

DESCRIPTION

       Bdy()  is  a  function which takes a geom as its argument.  The geom is then converted to a polylist, which is compressed (See plconsol(3).
       Bdy() then counts the number of edges in the polylist used once and only once, and returns a vector object  containing  these  edges.   The
       precision,  prec,  is used to determine the maximum distance between vertices which may be considered identical.  If the vertices must have
       identical coordinates, this value should be set to 0.0.	It is generally desirable to set the value somewhat higher to allow for  round-off
       error.

       The vector object is always black.

BUGS

       The  vector object is not a particularly compact representation of itself, since it contains many 2-vertex segments which could be combined
       into a longer polyline.

LINKING

       Bdy() is part of the geomutil library; see geomutil(3) for information on how to link your program with this library.

SEE ALSO

       bdy(1), geomview(1), anytopl(3), geomutil(3)

AUTHOR

       Celeste Fowler
       The Geometry Center

Geometry Center 						   June 15, 1992							  bdy(3gv)

AnyToPL(3gv)															      AnyToPL(3gv)

NAME

       AnyToPL - convert an arbitrary geom to a polylist (OFF file format)

SYNOPSIS

       #include "geomutil.h"

       Geom *AnyToPL(Geom *, Transform);

DESCRIPTION

       AnyToPL()  takes  any  geom as an arguement.  It then returns a polylist object which is geometrically identical to the original geom.  The
       transform argument is the transform applied to the entire object; it should generally be set to TM_IDENTITY when AnyToPL() is first called.
       Geometric objects are handled in the following ways:

       Polylists:  A transformed copy of the original is returned.

       Bezier:	The object is rediced if necessary, then handled as a mesh object.

       Quad:  The object is directly transformed into a new polylist.

       Mesh:  The object is directly transformed into a new polylist, with extra polygons added to do the wrapping if necessary.

       Vect:  The object is converted into a polylist containing a 2-gon for every segment in the original vector object.  The colors of the faces
       are the same as the colors of the original object, but this generally is irrelevant since the faces are not visible.  Note that edge  visi-
       bility must be enabled for an object which has been converted from a vect to a polylist to be visible in geomview.

       List:  AnyToPL() is called recursively and the resultant polylists are combined using PLCombine(3).  Inst:  AnyToPL() is called recursively
       with a new transformation matrix.  The resultant polylists are combined using PLCombine(3).

       No effort is made to eliminate identical vertices.  However, no extraneous repeated vertexes should be  created.   The  resultant  polylist
       should have the same number of vertexes as the original object.

LINKING

       AnyToPL() is part of the geomutil library; see geomutil(3) for information on how to link your program with this library.

SEE ALSO

       plcombine(3), anytooff(1), geomview(1), geomutil(3)

AUTHOR

       Celeste Fowler
       The Geometry Center

Geometry Center 						   June 15, 1992						      AnyToPL(3gv)