[vtkusers] piecewise function for volume rendering

[Kevin H. Hobbs]

On Saturday 12 July 2008 11:57:38 am amal / wrote:
> vtkpiecewisetransferfunction is the function responsable for adjusting the
> opasity of the reconstructed volume. 

Yes, that's correct.

> i want to use this function to set the 
> opasity of the back ground of my images to zero (transparent) so that only
> the part i want to see will be reconstructed.

<snip>

> vtkPiecewiseFunction opacitytransfer = new vtkPiecewiseFunction();
> opacitytransfer.ClampingOff();
>
> opacitytransfer.AddPoint(0, 0.0);
> opacitytransfer.AddPoint(255,0.0);

You might want to try:

opacitytransfer.AddPoint(0,     0.0);
opacitytransfer.AddPoint(8,     0.0);
opacitytransfer.AddPoint(255, 1.0);
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