[vtkusers] VTK : vtkLookupTable blues..

[Luke J West]

FANTASTIC, Ed - it works a treat!!

thanks,

luke


Quoting Ed Bachta <ebachta at iupui.edu>:

> 
> You might try adding:
> 
> topog_map->SetScalarRange(0, 1000);
> 
> 
> 
> On Tue, 2003-09-09 at 09:56, Luke J West wrote:
> > Hi,
> > 
> > I can get vtkLookupTable to respond to SetHueRange, SetSaturationRange
> and
> > SetValueRange, to create just the colourtable I want, but it ignores calls
> to
> > SetTableRange, and continues to map the colourtable onto the data range
> [0,1],
> > which I assume is the default behavior. I've tried to do this in numerous
> pieces
> > of code, but to no avail.
> > 
> > any ideas?
> > 
> > here is my pipeline from vtkStructuredGrid to vtkActor...
> > 
> > thanks,
> > 
> > luke
> > 
> > 
> >   vtkStructuredGrid* topog_grd = vtkStructuredGrid::New();
> >    topog_grd->SetDimensions(NX(),NY(),1);
> >    topog_grd->SetPoints(topog_pts);
> >    topog_pts->Delete();
> >    topog_grd->GetPointData()->SetScalars(topog_arr);
> >                                                                            
>   
> >                               
> >   vtkContourFilter* topog_con = vtkContourFilter::New();
> >    topog_con->SetInput(topog_grd);
> >    topog_con->GenerateValues(Nz(),0,1000);
> >                                                                            
>   
> >                               
> >   vtkLookupTable* topog_lut = vtkLookupTable::New();
> >    topog_lut->SetTableRange     (0,1000); // has no effect
> >    topog_lut->SetHueRange       ( 0, 1);
> >    topog_lut->SetSaturationRange( 1, 1);
> >    topog_lut->SetValueRange     ( 1, 1);
> >                                         
> >   vtkStructuredGridGeometryFilter* topog_geo =
> > vtkStructuredGridGeometryFilter::New();
> >    topog_geo->SetInput(topog_grd);
> >    topog_geo->SetExtent(0,NX(),0,NY(),0,0);
> >                                             
> >   vtkPolyDataMapper* topog_map = vtkPolyDataMapper::New();
> >    topog_map->SetLookupTable(topog_lut);
> >    topog_map->SetInput(topog_con->GetOutput());
> >                                                 
> >   vtkActor* topog_act = vtkActor::New();
> >    topog_act->SetMapper(topog_map); 
> > 
> > 
> > Luke J West : Research Assistant : e-Science
> > --------------------------------------------
> > Rm. 566/12, School of Ocean & Earth Sciences
> > Southampton Oceanography Centre, Southampton
> > SO14 3ZH  United Kingdom
> > --------------------------------------------
> > Tel: +44 23 8059 4801  Fax: +44 23 8059 3052
> > Mob: +44 79 6107 4783
> > 
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> 
> -- 
> Ed Bachta
> Technical Lead
> Visualization and Interactive Spaces Lab,
> Pervasive Technology Labs at Indiana University
> http://vis.iu.edu
>