function invert_all_normals (ENTITY* ent)
{
	CONTACT* c;
	VECTOR inv;
	int i;
	i = ent_status (ent,1);
	for (;i>0;i--) {
		c = ent_getvertex (ent,NULL,i);
		vec_set(inv,vector(c.nx,c.ny,c.nz));vec_inverse(inv);
		c.nx = inv.x;c.ny = inv.y;c.nz = inv.z;
		//c.v.nx = inv.x;c.v.ny = inv.y;c.v.nz = inv.z;
		ent_setvertex(ent,c,i);
	}
}