I have a custom filter that sets an RGB value for each cell in a
surface mesh, where each cell is a triangle. When the filter runs in
paraview I "see" the new arrays show up when I click on the
"Information" tab but the "Color By" drop down only has the "Solid
Color" available.
Here is the relevant parts of the code:
vtkCellData* cd = input->GetCellData();
vtkDataArray* normals = cd->GetNormals();
if (NULL == normals || (normals && normals->GetNumberOfTuples() <=
0 ) )
{
std::cout << "NORMALS were not present" << std::endl;
normals = NULL;
}
if (NULL == normals)
{
vtkPolyDataNormals* polyNormals = vtkPolyDataNormals::New();
polyNormals->SetInput(input);
polyNormals->SplittingOff();
polyNormals->ConsistencyOn ();
polyNormals->AutoOrientNormalsOn();
polyNormals->ComputePointNormalsOff();
polyNormals->ComputeCellNormalsOn();
polyNormals->FlipNormalsOff();
polyNormals->NonManifoldTraversalOff();
polyNormals->Update();
output->ShallowCopy(polyNormals->GetOutput());
}
cd = output->GetCellData();
normals = cd->GetNormals();
vtkUnsignedCharArray* rgb = vtkUnsignedCharArray::New();
rgb->SetName(INTERFACE_COLORING);
rgb->SetNumberOfComponents(3);
vtkDataArray* eulerArray = input->GetFieldData()-
>GetArray(OIMColoring::EulerAngles().c_str());
if (NULL == eulerArray)
{
vtkErrorMacro( << "Euler Angles Field Data Missing from Data set.
This filter requires the euler angles to work");
return 0;
}
double* eulers = eulerArray->GetTuple3(0);
double* refDirection; //[3] = {45.0, 45.0, 0.0};
unsigned char bytes[3] = { 65, 0, 255 };
for (vtkIdType i = 0; i < normals->GetNumberOfTuples(); ++i)
{
refDirection = normals->GetTuple3(i);
OIMColoring::GenerateIPFColor<double>(eulers, refDirection, bytes);
// std::cout << (int)(bytes[0]) << " " << (int)(bytes[1]) << " "
<< (int)(bytes[2]) << std::endl;
rgb->InsertNextTupleValue(bytes);
}
output->GetCellData()->SetScalars(rgb);
output->GetCellData()->SetActiveScalars(INTERFACE_COLORING);
Helpful insights are very welcome.
___________________________________________________________
Mike Jackson www.bluequartz.net
Principal Software Engineer mike.jack...@bluequartz.net
BlueQuartz Software Dayton, Ohio
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