[vtkusers] vtkMarchingCubes->vtkSmoothPolyDataFilter->vtkCurvatures

[Liam Kurmos]

Still working on why im getting contour like lines of negative
curvature on spherical surface extracted with marching cubes.

I decided to play with the lookup table in case the curvatures values
what not being mapped as i expected.

vtkLookupTable* lut = vtkLookupTable::New();
    lut->SetHueRange(0.0, 0.4); //Red to Blue
    lut->SetAlphaRange(1.0, 1.0);
    lut->SetValueRange(1.0, 1.0);
    lut->SetSaturationRange(1.0, 1.0);
    lut->SetNumberOfTableValues(256);
    //lut->SetRange(99, 100);

    lut->Build();


    vtkPolyDataMapper *polyMap2 = vtkPolyDataMapper::New();
    polyMap2->SetLookupTable(lut);
    polyMap2->SetInputConnection(curv->GetOutputPort());


I discovered that even when i put silly values in for the arguments to
lut->SetRange there is no affect on the output. Can anyone tell me why
this is?

Should i be trying to look at the numerical values of the scalars?
what would be a good way to do this?


> ive also noticed im getting the following throw to the command line:
>
> ERROR: In /build/buildd/vtk-5.2.1/Graphics/vtkCurvatures.cxx, line 63
> vtkCurvatures (0x81b540): No points/cells to operate on
>
> althought vtkCuravtures seems to be generating scalars.
>

I didn't spot this at first but this runtime message refers to
vtk-5.2.1 i thought i just build 5.6, does this mean something went
wrong with the install?

best regards,

Liam