reset method
      
void
reset()
      
     
    
    
Implementation
void reset() {
  _state = OrbitState.none;
  _keyState = OrbitState.none;
  scope.target.setFrom(scope.target0);
  scope.object.position.setFrom(scope.position0);
  scope.object.up.setFrom(scope.up0);
  scope.object.zoom = scope.zoom0;
  scope.object.updateProjectionMatrix();
  _eye.sub2(scope.object.position, scope.target);
  scope.object.lookAt(scope.target);
  scope.dispatchEvent(_changeEvent);
  lastPosition.setFrom(scope.object.position);
  lastZoom = scope.object.zoom;
}