typedef struct
{
	int		numpoints;
	vec3_t	p[4];		// variable sized
} winding_t;

#define	MAX_POINTS_ON_WINDING	64

#define	ON_EPSILON	0.1

winding_t	*AllocWinding (int points);
vec_t	WindingArea (winding_t *w);
void	WindingCenter (winding_t *w, vec3_t center);
void	ClipWinding (winding_t *in, vec3_t normal, vec_t dist,
					 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	*BaseWindingForPlane (vec3_t normal, float dist);
void	CheckWinding (winding_t *w);
void	WindingPlane (winding_t *w, vec3_t normal, vec_t *dist);
void	RemoveColinearPoints (winding_t *w);