* be within epsilon precision.
*/
public void testOverlapSphere2() {
//set up two spheres, occupying the exact same space
Sphere s1 = new Sphere(1);
Body b1 = new Body("default", s1);
b1.setPosition(new Vector3(0,0,0));
Sphere s2 = new Sphere(1);
Body b2 = new Body("default", s2);
b2.setPosition(new Vector3(0,0,0));
int N = 1024*2;
Vector3 displacement = new Vector3(-4,1,-2);