PLCombine - polylist two polylists (OFF file format) into one
Geom *PLCombine(Geom *, Geom *);
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-ver‐
tex 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
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.
PLCombine() is part of the geomutil library; see geomutil(3) for infor‐
mation on how to link your program with this library.
offcombine(1), geomview(1), geomutil(3)
The Geometry Center
Geometry Center June 15, 1992 plcombine(3gv)