void WindingCenter (winding_t *w, vec3_t center);
void ClipWindingEpsilon (winding_t *in, vec3_t normal, vec_t dist,
vec_t epsilon, winding_t **front, winding_t **back);
+void ClipWindingEpsilonStrict (winding_t *in, vec3_t normal, vec_t dist,
+ vec_t epsilon, winding_t **front, winding_t **back);
winding_t *ChopWinding (winding_t *in, vec3_t normal, vec_t dist);
winding_t *CopyWinding (winding_t *w);
winding_t *ReverseWinding (winding_t *w);