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plcombine(3gv)


NAME

   PLCombine - polylist two polylists (OFF file format) into one

SYNOPSIS

   Geom *PLCombine(Geom *, Geom *);

DESCRIPTION

   PLCombine()  combines  two polylists into a single polylist and returns
   the new polylist.  If either of the old polylists was NULL, a  copy  of
   the  other  polylist (or NULL if both polylists were NULL) is returned.
   PLCombine() will generate an error if either of the parameters was  not
   of the polylist type.

   If  the two polylists represent color in an inconsistant way, PLCombine
   will attempt to preserve the color data.  If either polylist  has  per-
   polygon  colors, the result will have per-polygon colors.  If the other
   object originally had per-vertex colors, the color of the  first  point
   of each polygon will be used as the color of the polygon.  If the other
   polylist originally had no colors, the rgba value 0.15, 0.15, 0.15, 1.0
   will be used as the color of each of that polyline's polygons.

   If  neither  of  the  polylists had per-polygon colors but one had per-
   vertex colors, the value 0.15, 0.15, 0.15, 1.0  will  be  used  as  the
   color value for each of the vertices of the colorless polylist.

   If  neither  polylist  had  color  data, the result will not have color
   date.

   The result of PLCombine() will not include   normal  data  if  the  two
   polylists represent normals in an inconsistent way, for example, if one
   has per-vertex data and one has per-face data  or  one  has  per-vertex
   data and one has no data.

LINKING

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

SEE ALSO

   offcombine(1), geomview(1), geomutil(3)

AUTHOR

   Celeste Fowler
   The Geometry Center



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