[vtkusers] Contour Plot in Rectilinear Grid

[Michel Cancelliere]

Thank you! It solved the problem!. I used a vtkCelltoPointData filter to
pass the point data.

On Mon, Nov 16, 2009 at 1:53 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> For contouring, you want to set the point data, not the cell data:
>  rgrid.GetPointData().SetScalars(field_data);
>
>
> On Mon, Nov 16, 2009 at 4:50 AM, Michel Cancelliere
> <michel.cancelliere at polito.it> wrote:
> > Hi VTK users,
> >
> > I'm trying to represent a contour plot from a plane in a Rectilinear grid
> > but i can't. I'm wondering if some of you can help me with this. I'm
> doing
> > this:
> >
> >
> >            rgrid = new vtkRectilinearGrid();
> >             vtkFloatArray xcoords = new vtkFloatArray();
> >             vtkFloatArray ycoords = new vtkFloatArray();
> >             vtkFloatArray zcoords = new vtkFloatArray();
> >             vtkFloatArray field_data = new vtkFloatArray();
> >
> >
> >             read_file(r_file, xcoords); // This function reads from a
> file
> > and put its content in the xcoords variable
> >             read_file(t_file, ycoords);
> >             read_file(z_file, zcoords);
> >             read_file(field_file, field_data);
> >
> >
> >             Nx = xcoords.GetNumberOfTuples();
> >             Ny = ycoords.GetNumberOfTuples();
> >             Nz = zcoords.GetNumberOfTuples();
> >             rgrid.SetDimensions(Nx, Ny, Nz);
> >             rgrid.SetXCoordinates(xcoords);
> >             rgrid.SetYCoordinates(ycoords);
> >             rgrid.SetZCoordinates(zcoords);
> >             rgrid.GetCellData().SetScalars(field_data);
> >
> >
> >
> >             vtkRectilinearGridGeometryFilter plane = new
> > vtkRectilinearGridGeometryFilter();
> >             plane.SetInput(rgrid);
> >             plane.SetExtent(0, Nx-1, Ny-1, Ny-1, 0, Nz-1);
> >
> >
> >           vtkRectilinearGridGeometryFilter top = new
> > vtkRectilinearGridGeometryFilter();
> >             top.SetInput(rgrid);
> >             top.SetExtent(0, Nx-1, 0, Ny-1, 0, 0);
> >
> > //// CONTOUR PLOT ////////////////
> >             vtkContourFilter contour = new vtkContourFilter();
> >             contour.SetInputConnection(top.GetOutputPort());
> >             contour.ComputeNormalsOn();
> >             contour.GenerateValues(32, 0.2, 0.9);
> >
> >             vtkPolyDataMapper contourMapper = new vtkPolyDataMapper();
> >             contourMapper.SetInput(contour.GetOutput());
> >
> >             vtkActor contourActor = new vtkActor();
> >             contourActor.SetMapper(contourMapper);
> >             //////////////////////////////////
> >             ren.AddActor(contourActor);
> >
> >
> > After that i got nothing but a black screen.
> >
> > Thank you in advance for your help
> >
> > Michel Cancelliere
> >
> >
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