[vtkusers] Problem with probing unstructured grid

[Sergey Ryadno]

Hi,
i am trying to probe my unstructured grid with vtkProbeFilter, but i don`t
see any result.

// - At first step i create the unstructured grid:

VTK_CREATE(vtkPoints, points);
VTK_CREATE(vtkUnstructuredGrid, ngrid);
VTK_CREATE(vtkIdList, idList);
VTK_CREATE(vtkMergeCells, merger);

 unstrGrid = vtkSmartPointer<vtkUnstructuredGrid>::New();

merger->SetTotalNumberOfCells(size_x*size_y);
merger->SetTotalNumberOfPoints(size_x*size_y*8);
merger->SetTotalNumberOfDataSets(1);
merger->SetUnstructuredGrid(unstrGrid);

points->Allocate(size_x*size_y*8);

int p_index = 0;

for(int iy = 0; iy < size_y; iy++ )
{
    for(int ix = 0; ix < size_x; ix++ )
   {
     for(int i = 0; i < 8; i++)
       points->InsertNextPoint(Points[i].x,
                                          Points[i].y,
                                          Points[i].z);

     ngrid->SetPoints(points);

     idList->Reset();
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);
     idList->InsertNextId(p_index++);

    ngrid->InsertNextCell(VTK_HEXAHEDRON , idList);
   }
}

merger->MergeDataSet(ngrid);
merger->Finish();

 //- second, set scalars to each cell:

VTK_CREATE(vtkFloatArray, props);

for(int iy = 0; iy < size_y; iy++ )
{
   for(int ix = 0; ix < size_x; ix++ )
   {
     props->InsertNextValue(attributes[ix][iy]);
   }
}

unstrGrid->GetCellData()->SetScalars(props);

//and show grid

actor = vtkSmartPointer<vtkActor>::New();

VTK_CREATE(vtkGeometryFilter, geometryFilter);
geometryFilter->SetInput(unstrGrid);

VTK_CREATE(vtkPolyDataMapper, mapper);
mapper->SetInputConnection(geometryFilter->GetOutputPort());

actor->SetMapper(mapper);
actor ->GetProperty()->SetEdgeColor(0.0,0.0,0);
actor ->GetProperty()->SetEdgeVisibility(1);

renderer->AddActor(actor)
.......
//in result i have grid like on pic1.png.

//after that i try to probe this grid with vtkPlaneSource

PlaneSource = vtkSmartPointer<vtkPlaneSource>::New();

 PlaneSource->SetOrigin(p1.x, p1.y, Top);
 PlaneSource->SetPoint1(p1.x,p1.y, Bottom);

PlaneSource->SetPoint2(p2.x, p2.y, Top);

PlaneSource->Update();

Plane = PlaneSource->GetOutput();

PolyDataMapper= vtkSmartPointer<vtkPolyDataMapper>::New();

PolyDataMapper->SetInput(Plane);

planeActor = vtkSmartPointer<vtkActor>::New();
plane Actor->SetMapper(PolyDataMapper);

planeActor->GetProperty()->SetColor(0.4, 0.4, 0.3);
planeActor->GetProperty()->SetOpacity(0.8);
 planeActor->SetVisibility(0);

renderer->AddActor( planeActor )

//this plane shown on pic2.png.

// create probeFilter

 probeActor = vtkSmartPointer<vtkActor>::New();

VTK_CREATE(vtkProbeFilter, probeFilter);

probeFilter->SetSource(unstrGrid);
probeFilter->SetInput( PlaneSource->GetOutput());

probeFilter->Update();


VTK_CREATE(vtkDataSetMapper, probeMapper);

probeMapper->SetInputConnection(probeFilter->GetOutputPort());

probeMapper->SetScalarRange(probeFilter->GetOutput()->GetScalarRange());

probeActor->SetMapper(probeMapper);
probeActor->GetProperty()->SetEdgeVisibility(0);

renderer->AddActor( probeActor )

//after that i hide all actors except probeActor and in result i have an
empty plane on screen without anything on it. What i am doing wrong? I will
be grateful for any help, suggestion or code example about this theme.
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