[vtkusers] values of raycasting in volview

[kingaza at gmail.com]

hi, all

I am using vtk in rendering volume data. but i find some differece
comparing with volview.
do anyone know how to set the values for  
    -  vtkVolumeRayCastCompositeFunction
    -  vtkPiecewiseFunction
    -  vtkColorTransferFunction
and
    - vtkVolumeProperty
......

-- 
Regrads,
Kiingaza