var spring = 50.0;
  var damper = 5.0;
  var drag = 10.0;
  var angularDrag = 5.0;
  var distance = 0.2;
  var attachToCenterOfMass = false;
  
  private var springJoint : SpringJoint;
  
  function Update ()
  {
          // Make sure the user pressed the mouse down
          if (!Input.GetMouseButtonDown (0))
                  return;
  
          var mainCamera = FindCamera();
                  
          // We need to actually hit an object
          var hit : RaycastHit;
          if (!Physics.Raycast(mainCamera.ScreenPointToRay(Input.mousePosition),  hit, 100))
                  return;
          // We need to hit a rigidbody that is not kinematic
          if (!hit.rigidbody || hit.rigidbody.isKinematic)
                  return;
          
          if (!springJoint)
          {
                  var go = new GameObject("Rigidbody dragger");
                  body = go.AddComponent ("Rigidbody");
                  springJoint = go.AddComponent ("SpringJoint");
                  body.isKinematic = true;
          }
          
          springJoint.transform.position = hit.point;
          if (attachToCenterOfMass)
          {
                  var anchor = transform.TransformDirection(hit.rigidbody.centerOfMass) + hit.rigidbody.transform.position;
                  anchor = springJoint.transform.InverseTransformPoint(anchor);
                  springJoint.anchor = anchor;
          }
          else
          {
                  springJoint.anchor = Vector3.zero;
          }
          
          springJoint.spring = spring;
          springJoint.damper = damper;
          springJoint.maxDistance = distance;
          springJoint.connectedBody = hit.rigidbody;
          
          StartCoroutine ("DragObject", hit.distance);
  }
  
  function DragObject (distance : float)
  {
          var oldDrag = springJoint.connectedBody.drag;
          var oldAngularDrag = springJoint.connectedBody.angularDrag;
          springJoint.connectedBody.drag = drag;
          springJoint.connectedBody.angularDrag = angularDrag;
          var mainCamera = FindCamera();
          while (Input.GetMouseButton (0))
          {
                  var ray = mainCamera.ScreenPointToRay (Input.mousePosition);
                  springJoint.transform.position = ray.GetPoint(distance);
                  yield;
          }
          if (springJoint.connectedBody)
          {
                  springJoint.connectedBody.drag = oldDrag;
                  springJoint.connectedBody.angularDrag = oldAngularDrag;
                  springJoint.connectedBody = null;
          }
  }
  
  function FindCamera ()
  {
          if (camera)
                  return camera;
          else
                  return Camera.main;
  }