code: public void setNearClippingDistance(float near) {
          if(leftCamera instanceof GVRCameraClippingDistanceInterface &&
             centerCamera instanceof GVRCameraClippingDistanceInterface &&
             rightCamera instanceof GVRCameraClippingDistanceInterface) {
              ((GVRCameraClippingDistanceInterface)leftCamera).setNearClippingDistance(near);
              centerCamera.setNearClippingDistance(near);
              ((GVRCameraClippingDistanceInterface)rightCamera).setNearClippingDistance(near);
          }
      }
docs: Sets the distance from the origin to the near clipping plane for the
  whole camera rig.
  
  @param near
  Distance to the near clipping plane.