[vtkusers] Render only data that we need!!!

[Amy Squillacote]

I misunderstood before what you wanted to do.  Try passing your data 
through the vtkThreshold filter.  It extracts portions of your data set 
based on a scalar value.

- Amy

At 11:22 AM 4/12/2005, verena kinder wrote:
>But  we don't want to render a special space of the volume data.
>We want to render data with a special greyvalue in our case 255.
>
>Verena
>
>Amy Squillacote <amy.squillacote at kitware.com> schrieb am 12.04.05 16:30:15:
> >
> > Use the second option you listed.  You should use the SetDataVOI method 
> you
> > mentioned (indicated by vtkSetVector6Macro(DataVOI, int)).  This method
> > lets you specify a minimum and maximum value in X, Y, and Z that enclose
> > your volume of interest (VOI).
> >
> > The first option you listed (vtkPiecewiseFunction::removePoints(254); )
> > will change the colors used in rendering your data, but it will not cause
> > only the desired portion of the data to be rendered.
> >
> > - Amy
> >
> > At 10:18 AM 4/12/2005, verena kinder wrote:
> > >Hello!
> > >
> > >We want to render a segmented volume data set, but for example only data
> > >with scalar value off 255.
> > >
> > >We find two starting points:
> > >
> > >1. vtkPiecewiseFunction::removePoints(254);
> > >or
> > >2. only read in data that we need, we use the PNMReader();
> > >
> > >For the first point a problem appears while rendring the data. We get a
> > >black box, so we propose that all data we have remove with the function
> > >are assigned by 0.
> > >
> > >For the second point we even don't know the starting point, is there a
> > >function in the class PNMReader or in that superclasses we could use? 
> What
> > >about the vtkSetVector6Macro(DataVOI,int)?
> > >
> > >Or is there another possibility?
> > >
> > >Thanks
> > >
> > >
> > >Verena
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