RectilinearGrid

VTKExamples/Python/RectilinearGrid/RectilinearGrid


Description

Shows how to create a vtkRectilinearGrid.

Code

RectilinearGrid.py

import vtk

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(0, 0, 0)

# 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(1, 1, 1)
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()