- vtkPiecewiseFunction* _tfun;
- vtkColorTransferFunction* _ctfun;
- vtkVolumeRayCastMIPFunction* _MIPFunction;
+ vtkPiecewiseFunction *_tfun;
+ vtkColorTransferFunction *_ctfun;
+
+#if (VTK_MAJOR_VERSION <= 7)
+ vtkVolumeRayCastMIPFunction *_MIPFunction;
+ vtkVolumeRayCastCompositeFunction *_compositeFunction;
+ vtkVolumeRayCastMapper *_volumeMapper;
+#else
+ vtkFixedPointVolumeRayCastMapper *_volumeMapper;
+#endif
+