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# StructuredPointsToUnstructuredGrid

VTKEx/Java/StructuredPoints/StructuredPointsToUnstructuredGrid

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### Code

StructuredPointsToUnstructuredGrid.java

    import vtk.vtkNativeLibrary;
    import vtk.vtkStructuredPoints;
    import vtk.vtkPoints;
    import vtk.vtkUnstructuredGrid;
    import vtk.vtkXMLUnstructuredGridWriter;

    public class StructuredPointsToUnstructuredGrid
    {
      // -----------------------------------------------------------------
      // Load VTK library and print which library was not properly loaded
      static
      {
        if (!vtkNativeLibrary.LoadAllNativeLibraries())
        {
          for (vtkNativeLibrary lib : vtkNativeLibrary.values())
          {
            if (!lib.IsLoaded())
            {
              System.out.println(lib.GetLibraryName() + " not loaded");
            }
          }
        }
        vtkNativeLibrary.DisableOutputWindow(null);
      }
      // -----------------------------------------------------------------

      public static void main(String args[])
      {

        //parse command line arguments
        if (args.length != 1)
        {
          System.err.println("Usage: java -classpath ... Filename(.vtu) e.g output.vtu");
          return;
        }
        String outputFilename = args[0];

        // Create a structuredpoints
        vtkStructuredPoints structuredPoints = new vtkStructuredPoints();

        // Specify the size of the image data
        structuredPoints.SetDimensions(2,3,1);
        int VTK_DOUBLE = 11;
        structuredPoints.AllocateScalars(VTK_DOUBLE,1);

        int dims[] = new int[3];
        dims=structuredPoints.GetDimensions();

        System.out.println("Dims: " + "\n" + " x: " + " " + dims[0] + " " +  " y: " + dims[1] + " z: " + " " + dims[2] );
        System.out.println("Number of points: " + " " + structuredPoints.GetNumberOfPoints());
        System.out.println("Number of cells: " + " " + structuredPoints.GetNumberOfCells());

        // Copy the points from the StructuredPoints to the UnstructuredGrid
        vtkPoints points = new vtkPoints();

        //retrieve the entries from the grid and print them to the screen
        double p[] = new double[3];
        for(int i = 0; i < structuredPoints.GetNumberOfPoints(); i++)
        {
          structuredPoints.GetPoint(i, p);
          points.InsertNextPoint(p);
        }

        vtkUnstructuredGrid ug = new vtkUnstructuredGrid();
        ug.SetPoints(points);

        vtkXMLUnstructuredGridWriter writer = new vtkXMLUnstructuredGridWriter();
        writer.SetFileName(outputFilename);
        writer.SetInputData(ug);
        writer.Write();

      }
    }