3D Polytope volume

This algorithm compute fastly the volume of a convex polytope through a set of points.

The header is as simple as that.

typedef struct ConvexHull {
	int i0;
	int i1;
	int i2;
	double n[4];
	struct ConvexHull * next;
} ConvexHull;

double volume(double * X, double * Y, double * Z, int nb_points);