# RectilinearGrid

VTKExamples/Python/RectilinearGrid/RectilinearGrid

### Description

Shows how to create a vtkRectilinearGrid.

Other Languages

See (Cxx), (Java)

### Code

RectilinearGrid.py

    import vtk

    def main():
        colors = vtk.vtkNamedColors()

        x = [
            -1.22396, -1.17188, -1.11979, -1.06771, -1.01562, -0.963542,
            -0.911458, -0.859375, -0.807292, -0.755208, -0.703125, -0.651042,
            -0.598958, -0.546875, -0.494792, -0.442708, -0.390625, -0.338542,
            -0.286458, -0.234375, -0.182292, -0.130209, -0.078125, -0.026042,
            0.0260415, 0.078125, 0.130208, 0.182291, 0.234375, 0.286458,
            0.338542, 0.390625, 0.442708, 0.494792, 0.546875, 0.598958,
            0.651042, 0.703125, 0.755208, 0.807292, 0.859375, 0.911458,
            0.963542, 1.01562, 1.06771, 1.11979, 1.17188]

        y = [
            -1.25, -1.17188, -1.09375, -1.01562, -0.9375, -0.859375,
            -0.78125, -0.703125, -0.625, -0.546875, -0.46875, -0.390625,
            -0.3125, -0.234375, -0.15625, -0.078125, 0, 0.078125,
            0.15625, 0.234375, 0.3125, 0.390625, 0.46875, 0.546875,
            0.625, 0.703125, 0.78125, 0.859375, 0.9375, 1.01562,
            1.09375, 1.17188, 1.25]

        z = [
            0, 0.1, 0.2, 0.3, 0.4, 0.5,
            0.6, 0.7, 0.75, 0.8, 0.9, 1,
            1.1, 1.2, 1.3, 1.4, 1.5, 1.6,
            1.7, 1.75, 1.8, 1.9, 2, 2.1,
            2.2, 2.3, 2.4, 2.5, 2.6, 2.7,
            2.75, 2.8, 2.9, 3, 3.1, 3.2,
            3.3, 3.4, 3.5, 3.6, 3.7, 3.75,
            3.8, 3.9]

        # Create a rectilinear grid by defining three arrays specifying the
        # coordinates in the x-y-z directions.
        xCoords = vtk.vtkFloatArray()
        for i in x:
            xCoords.InsertNextValue(i)

        yCoords = vtk.vtkFloatArray()
        for i in y:
            yCoords.InsertNextValue(i)

        zCoords = vtk.vtkFloatArray()
        for i in z:
            zCoords.InsertNextValue(i)

        # The coordinates are assigned to the rectilinear grid. Make sure that
        # the number of values in each of the XCoordinates, YCoordinates,
        # and ZCoordinates is equal to what is defined in SetDimensions().
        #
        rgrid = vtk.vtkRectilinearGrid()
        rgrid.SetDimensions(len(x), len(y), len(z))
        rgrid.SetXCoordinates(xCoords)
        rgrid.SetYCoordinates(yCoords)
        rgrid.SetZCoordinates(zCoords)

        # Extract a plane from the grid to see what we've got.
        plane = vtk.vtkRectilinearGridGeometryFilter()
        plane.SetInputData(rgrid)
        plane.SetExtent(0, 46, 16, 16, 0, 43)

        rgridMapper = vtk.vtkPolyDataMapper()
        rgridMapper.SetInputConnection(plane.GetOutputPort())

        wireActor = vtk.vtkActor()
        wireActor.SetMapper(rgridMapper)
        wireActor.GetProperty().SetRepresentationToWireframe()
        wireActor.GetProperty().SetColor(colors.GetColor3d("Black"))
        wireActor.GetProperty().EdgeVisibilityOn()

        # Create the usual rendering stuff.
        renderer = vtk.vtkRenderer()
        renWin = vtk.vtkRenderWindow()
        renWin.AddRenderer(renderer)
        iren = vtk.vtkRenderWindowInteractor()
        iren.SetRenderWindow(renWin)

        renderer.AddActor(wireActor)
        renderer.SetBackground(colors.GetColor3d("AliceBlue"))
        renderer.ResetCamera()
        renderer.GetActiveCamera().Elevation(60.0)
        renderer.GetActiveCamera().Azimuth(30.0)
        renderer.GetActiveCamera().Zoom(1.0)

        renWin.SetSize(300, 300)

        # interact with data
        renWin.Render()
        iren.Start()

    if __name__ == '__main__':
        main()