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- /* Copyright (c) 1992 The Geometry Center; University of Minnesota
- 1300 South Second Street; Minneapolis, MN 55454, USA;
-
- This file is part of geomview/OOGL. geomview/OOGL is free software;
- you can redistribute it and/or modify it only under the terms given in
- the file COPYING, which you should have received along with this file.
- This and other related software may be obtained via anonymous ftp from
- geom.umn.edu; email: software@geom.umn.edu. */
-
- /* Authors: Charlie Gunn, Stuart Levy, Tamara Munzner, Mark Phillips */
-
- #include "quadP.h"
-
- /*
- * Note: Calling QuadNormal will undo this!
- */
- Quad *
- QuadEvert( quad )
- Quad *quad;
- {
- int q;
- register Point3 *np;
-
- if(quad != NULL && (np = &quad->n[0][0]) != NULL) {
- for(q = 4 * quad->maxquad; --q >= 0; np++) {
- np->x = -np->x;
- np->y = -np->y;
- np->z = -np->z;
- }
- }
- return quad;
- }
-