[vtkusers] Piecewise Function for Volume Rendering

[Yuan Jin]

Hi all,

Does anyone have experience in setting up the piecewise function for the 
volume rendering? ie. which points should be added to the piecewise 
function? Is the histogram for the 3D image helpful?

For instance, in the example: VolCutKnee.py

white_tfun = vtkPiecewiseFunction()
white_tfun.AddPoint(0,1.0)
white_tfun.AddPoint(255,1.0)
tfun = vtkPiecewiseFunction()
tfun.AddPoint(70,0.0)
tfun.AddPoint(80,1.0)
vol_prop = vtkVolumeProperty()
vol_prop.SetColor(white_tfun)
vol_prop.SetScalarOpacity(tfun)

How to find out tfun.AddPoint(70,0.0) and tfun.AddPoint(80,1.0) ?

Thanks a lot,

Yuan



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