static float EDGE_getSharpness(CCGEdge *e, int lvl) {
	if (lvl==0)
		return e->crease;
	else if (e->crease==0.0f)
		return 0.0;
	else if (e->crease - (float)lvl < 0.0)
		return 0.0;
	else
		return e->crease - (float)lvl;
}