Hi,
I'm struggling to get a proper 3D view of my model system (yes,
embarrassing!)
but must admit my defeat.
After stripping almost everything, keeping the minimum to exhibit the
issue,
I'm left with the following:
I have created a simple box source. To get a 3D representation, I
sub-classed
the code for this Source from vtkUnstructuredGridAlgorithm.
In the RequestData method, I define the 8 point of the unit cube. I
added the points to the
underlying unstructed grid, and I specified the cell topology.
This all seems to work: when instantiating this box Source, I *do* get the
expected cube in the representations (Surface, wireframe, Points).
However, when I select the "Volume" representation, *the image disappears*
What am I doing wrong?
As the code is not too long and very simple, I take the freedom to paste
it below.
Kind regards.
Bertwim
=========================================
int sphBoxSourceC::RequestData( vtkInformation *vtkNotUsed(request),
vtkInformationVector
**vtkNotUsed(inputVector),
vtkInformationVector *outputVector)
{
// Get the info object
vtkInformation *outInfo = outputVector->GetInformationObject(0);
vtkUnstructuredGrid *umesh = vtkUnstructuredGrid::SafeDownCast(
outInfo->Get( vtkDataObject::DATA_OBJECT() ) );
// Pre-allocate some memory
umesh->Allocate( 1024 );
// Specify points.
double r0[] = { 0.0, 0.0, 0.0 };
double r1[] = { 1.0, 0.0, 0.0 };
double r2[] = { 0.0, 1.0, 0.0 };
double r3[] = { 1.0, 1.0, 0.0 };
double r4[] = { 0.0, 0.0, 1.0 };
double r5[] = { 1.0, 0.0, 1.0 };
double r6[] = { 0.0, 1.0, 1.0 };
double r7[] = { 1.0, 1.0, 1.0 };
// Collect the points in a vtk data structures.
{
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
points->SetDataType( VTK_DOUBLE );
points->InsertNextPoint( r0 );
points->InsertNextPoint( r1 );
points->InsertNextPoint( r2 );
points->InsertNextPoint( r3 );
points->InsertNextPoint( r4 );
points->InsertNextPoint( r5 );
points->InsertNextPoint( r6 );
points->InsertNextPoint( r7 );
// Transfer points to umesh.
umesh->SetPoints( points );
}
// Cell Topology
vtkIdType vtx[8] = { 0, 1, 3, 2, 4, 5, 7, 6 };
umesh->InsertNextCell( VTK_HEXAHEDRON, 8, vtx );
return 1;
}
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