ren.ResetCameraClippingRange();
resetCameraClippingRange();
  public void mouseDragged(MouseEvent e)    {      if (ren.VisibleActorCount() == 0) return;      int x = e.getX();      int y = e.getY();      // rotate      if (this.InteractionMode == 1)        {        cam.Azimuth(lastX - x);        cam.Elevation(y - lastY);        cam.OrthogonalizeViewUp();        ren.ResetCameraClippingRange();        if (this.LightFollowCamera == 1)          {          lgt.SetPosition(cam.GetPosition());          lgt.SetFocalPoint(cam.GetFocalPoint());          }        }      // translate      if (this.InteractionMode == 2)        {        double  FPoint[];        double  PPoint[];        double  APoint[] = new double[3];        double  RPoint[];        double focalDepth;                // get the current focal point and position        FPoint = cam.GetFocalPoint();        PPoint = cam.GetPosition();                // calculate the focal depth since we'll be using it a lot        ren.SetWorldPoint(FPoint[0],FPoint[1],FPoint[2],1.0);        ren.WorldToDisplay();        focalDepth = ren.GetDisplayPoint()[2];                APoint[0] = rw.GetSize()[0]/2.0 + (x - lastX);        APoint[1] = rw.GetSize()[1]/2.0 - (y - lastY);        APoint[2] = focalDepth;        ren.SetDisplayPoint(APoint);        ren.DisplayToWorld();        RPoint = ren.GetWorldPoint();        if (RPoint[3] != 0.0)          {          RPoint[0] = RPoint[0]/RPoint[3];          RPoint[1] = RPoint[1]/RPoint[3];          RPoint[2] = RPoint[2]/RPoint[3];          }                /*         * Compute a translation vector, moving everything 1/2          * the distance to the cursor. (Arbitrary scale factor)         */        cam.SetFocalPoint(          (FPoint[0]-RPoint[0])/2.0 + FPoint[0],          (FPoint[1]-RPoint[1])/2.0 + FPoint[1],          (FPoint[2]-RPoint[2])/2.0 + FPoint[2]);        cam.SetPosition(          (FPoint[0]-RPoint[0])/2.0 + PPoint[0],          (FPoint[1]-RPoint[1])/2.0 + PPoint[1],          (FPoint[2]-RPoint[2])/2.0 + PPoint[2]);        ren.ResetCameraClippingRange();        }      // zoom      if (this.InteractionMode == 3)        {        double zoomFactor;        double clippingRange[];                zoomFactor = Math.pow(1.02,(y - lastY));        if (cam.GetParallelProjection() == 1)          {          cam.SetParallelScale(cam.GetParallelScale()/zoomFactor);          }        else          {          cam.Dolly(zoomFactor);          ren.ResetCameraClippingRange();          }        }      lastX = x;      lastY = y;      this.Render();    }