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

[verena kinder]

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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