if(gui.selectBox.getSelectedIndex()==0)
        {
            objectSphere_r.selected=true;
            objectSphere_g.selected=false;
            objectSphere_b.selected=false;
            objectSphere_y.selected=false;
            objectSphere.selected=false;
            objectBox.selected=false;
        }
        if(gui.selectBox.getSelectedIndex()==1)
        {
            objectSphere_r.selected=false;
            objectSphere_g.selected=true;
            objectSphere_b.selected=false;
            objectSphere_y.selected=false;
            objectSphere.selected=false;
            objectBox.selected=false;
        }
        ..............
        .............

        for(int i=0; i<instances.size; i++)
        {
            GameObject obj = instances.get(i);
            if(obj.selected)
            {
                Vector3 pos = new Vector3();
                obj.body.getWorldTransform().getTranslation(pos);
                
                for(int j=0; j<instances.size; j++)
                {
                    GameObject obj2 = instances.get(j);
                    Vector3 pos2 = new Vector3();
                    obj2.body.getWorldTransform().getTranslation(pos2);
                    Vector3 npos = new Vector3(pos2.sub(pos));
                    obj2.transform.setTranslation(npos);
                    obj2.body.proceedToTransform(obj2.transform);
                }
            }
        }

                Quaternion boxRot = objectBox.body.getOrientation();
    Vector3 Yup = new Vector3(0,1,0);
    Vector3 Ydown = new Vector3(0,-1,0);
    Vector3 newYup = Yup.mul(boxRot);
    Vector3 newYdown = Ydown.mul(boxRot);
    
    Vector3 Zup = new Vector3(0,0,1);
    Vector3 Zdown = new Vector3(0,0,-1);
    Vector3 newZup = Zup.mul(boxRot);
    Vector3 newZdown = Zdown.mul(boxRot);
    
    Vector3 XkL = new Vector3(-1,0,0);
    Vector3 XkR = new Vector3(1,0,0);
    Vector3 newXkL = XkL.mul(boxRot);
    Vector3 newXkR = XkR.mul(boxRot);
        
        if(gui.leftButton.b)
        {
            objectBox.body.applyForce(newXkR, newZup);
            objectBox.body.applyForce(newXkL, newZdown);
        }
        if(gui.rightButton.b)
        {
            objectBox.body.applyForce(newXkR, newZdown);
            objectBox.body.applyForce(newXkL, newZup);
        }
        .........