1 /* normals, Copyright (c) 2002-2012 Jamie Zawinski <jwz@jwz.org>
3 * Permission to use, copy, modify, distribute, and sell this software and its
4 * documentation for any purpose is hereby granted without fee, provided that
5 * the above copyright notice appear in all copies and that both that
6 * copyright notice and this permission notice appear in supporting
7 * documentation. No representations are made about the suitability of this
8 * software for any purpose. It is provided "as is" without express or
11 * Compute normal vectors for arbitrary triangles.
19 #endif /* HAVE_CONFIG_H */
31 #endif /* HAVE_JWZGLES */
37 /* Calculate the unit normal at p given two other points p1,p2 on the
38 surface. The normal points in the direction of p1 crossproduct p2
40 extern XYZ calc_normal (XYZ p, XYZ p1, XYZ p2);
42 /* Call glNormal3f() with a normal of the indicated triangle.
44 extern void do_normal (GLfloat x1, GLfloat y1, GLfloat z1,
45 GLfloat x2, GLfloat y2, GLfloat z2,
46 GLfloat x3, GLfloat y3, GLfloat z3);
48 #endif /* __NORMALS_H__ */