RGrid

VTKExamples/Cxx/RectilinearGrid/RGrid


Description

Creating a rectilinear grid dataset. The coordinates along each axis are defined using an instance of vtkDataArray.

Code

RGrid.cxx

// This example shows how to create a rectilinear grid.
//
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkDoubleArray.h>
#include <vtkNamedColors.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRectilinearGrid.h>
#include <vtkRectilinearGridGeometryFilter.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>

int main(int, char *[])
{
  int i;
  static double x[47]={
    -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};
  static double y[33]={-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};
  static double z[44]={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.
  vtkSmartPointer<vtkDoubleArray> xCoords =
    vtkSmartPointer<vtkDoubleArray>::New();
  for (i=0; i<47; i++)
  {
    xCoords->InsertNextValue(x[i]);
  }
  vtkSmartPointer<vtkDoubleArray> yCoords =
    vtkSmartPointer<vtkDoubleArray>::New();
  for (i=0; i<33; i++)
  {
    yCoords->InsertNextValue(y[i]);
  }
  vtkSmartPointer<vtkDoubleArray> zCoords =
    vtkSmartPointer<vtkDoubleArray>::New();
  for (i=0; i<44; i++)
  {
    zCoords->InsertNextValue(z[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().
  //
  vtkSmartPointer<vtkRectilinearGrid> rgrid =
    vtkSmartPointer<vtkRectilinearGrid>::New();
  rgrid->SetDimensions(47,33,44);
  rgrid->SetXCoordinates(xCoords);
  rgrid->SetYCoordinates(yCoords);
  rgrid->SetZCoordinates(zCoords);

  // Extract a plane from the grid to see what we've got.
  vtkSmartPointer<vtkRectilinearGridGeometryFilter> plane =
    vtkSmartPointer<vtkRectilinearGridGeometryFilter>::New();
  plane->SetInputData(rgrid);
  plane->SetExtent(0,46, 16,16, 0,43);

  vtkSmartPointer<vtkPolyDataMapper> rgridMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  rgridMapper->SetInputConnection(plane->GetOutputPort());

  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkActor> wireActor =
    vtkSmartPointer<vtkActor>::New();
  wireActor->SetMapper(rgridMapper);
  wireActor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
  wireActor->GetProperty()->EdgeVisibilityOn();

  // Create the usual rendering stuff.
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

  renderer->AddActor(wireActor);
  renderer->SetBackground(colors->GetColor3d("Beige").GetData());
  renderer->ResetCamera();
  renderer->GetActiveCamera()->Elevation(60.0);
  renderer->GetActiveCamera()->Azimuth(30.0);
  renderer->GetActiveCamera()->Zoom(1.0);

  renWin->SetSize(640, 480);

  // interact with data
  renWin->Render();
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(RGrid)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(RGrid MACOSX_BUNDLE RGrid.cxx )

target_link_libraries(RGrid ${VTK_LIBRARIES})

Download and Build RGrid

Click here to download RGrid and its CMakeLists.txt file. Once the tarball RGrid.tar has been downloaded and extracted,

cd RGrid/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./RGrid

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.