void OnEnable()
        {
            this.previewUtility = new PreviewRenderUtility(false, true);
            previewUtility.cameraFieldOfView         = 30.0f;
            previewUtility.camera.nearClipPlane      = 0.01f;
            previewUtility.camera.farClipPlane       = 20.0f;
            previewUtility.camera.transform.position = new Vector3(0, 0, 2);
            previewUtility.camera.transform.LookAt(Vector3.up);

            this.previewObject = (LightProbeSHCoefficientsAsset)this.target;
        }
 void OnDisable()
 {
     this.previewUtility.Cleanup();
     this.previewUtility = null;
     this.previewObject  = null;
 }