[vtkusers] vtkDataSetMapper Coloring Question

[Jeremy Stout]

Thanks for the tip, I was able to get it working.

Jeremy Stout

On 7/7/05, krs <krs at uncc.edu> wrote:
> You need to build your own color lookuptable - there are several 
> examples under vtkColorLookupTable that shows you how to do this.
> 
>     -- krs
> 
> 
> 
> ................................................................................................................
> 
> Kalpathi Subramanian                                         Ph: 704 687
> 8579
> 
> Dept. of Computer Science                                 Fax: 704 687 3516
> 
> The Univ. of N. Carolina                                      Email:
> krs at uncc.edu                              Charlotte, NC 28223               
>                             Web: www.cs.uncc.edu/~krs
> 
> On Jul 7, 2005, at 8:43 AM, Jeremy Stout wrote:
> 
> I am using vtkDataSetMapper to help visualize a data set after putting
> it through a series of filters. As part of the visualization process,
> I am trying to color the dataset by a specific scalar array. That part
> is working pretty good for me. The only problem I am running into is
> that I want to flip the color spectrum on the lookup table the mapper
> is using so that blue represents the lower boundary of my scalar range
> and red is the upper range. At the moment, blue is representing the
> upper range and red the lower range. I've looked through the
> vtkLookupTable and vtkDataSetMapper APIs, but I haven't seen anything
> that will let me do what I am wanting. For what it is worth, here is
> the code I am using to setup the mapper (this is Java):
> 
> vtkDataSet filteredDataSet;
> 
> filteredDataSet = finalFilter.GetOutput();
> filteredDataSet.SetActiveScalars("void_fraction");
> 
> dataSetMapper = new vtkDataSetMapper();
> dataSetMapper.SetInput(filteredDataSet);
> dataSetMapper.SetScalarModeToUsePointFieldData();
> dataSetMapper.SetScalarRange(0.0, 4800.0);
> dataSetMapper.SelectColorArray("void_fraction");
> 
> I figure it is rather easy to swap the colors, but I am not seeing how
> to do it. Any help in this matter would be appreciated.
> 
> Jeremy Stout
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