StructuredGrid
VTKExamples/Cxx/StructuredGrid/StructuredGrid
Description
This example reads and writes points into a structured grid.
Required version: You must have the CVS HEAD of VTK as of 2/17/10.
Code
StructuredGrid.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkStructuredGrid.h>
#include <vtkXMLStructuredGridWriter.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
// Create a grid
vtkSmartPointer<vtkStructuredGrid> structuredGrid =
vtkSmartPointer<vtkStructuredGrid>::New();
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
double x, y, z;
x = 0.0;
y = 0.0;
z = 0.0;
for(unsigned int k = 0; k < 2; k++)
{
z += 2.0;
for(unsigned int j = 0; j < 3; j++)
{
y += 1.0;
for(unsigned int i = 0; i < 2; i++)
{
x += .5;
points->InsertNextPoint(x, y, z);
}
}
}
// Specify the dimensions of the grid
structuredGrid->SetDimensions(2,3,2);
structuredGrid->SetPoints(points);
int* dims = structuredGrid->GetDimensions();
// Retrieve the entries from the grid and print them to the screen
unsigned int counter = 0;
for (int k = 0; k < dims[2]; k++)
{
for (int j = 0; j < dims[1]; j++)
{
for (int i = 0; i < dims[0]; i++)
{
double p[3];
structuredGrid->GetPoint(counter, p);
double pNew[3];
structuredGrid->GetPoint(i, j, k, pNew);
std::cout << "P : "
<< p[0] << " "
<< p[1] << " "
<< p[2] << std::endl;
std::cout << "PNew: "
<< pNew[0] << " "
<< pNew[1] << " "
<< pNew[2] << std::endl;
counter++;
}
}
}
// Create a mapper and actor
vtkSmartPointer<vtkDataSetMapper> mapper =
vtkSmartPointer<vtkDataSetMapper>::New();
#if VTK_MAJOR_VERSION <= 5
mapper->SetInputConnection(structuredGrid->GetProducerPort());
#else
mapper->SetInputData(structuredGrid);
#endif
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(.3, .6, .3); // Background color green
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(StructuredGrid)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(StructuredGrid MACOSX_BUNDLE StructuredGrid.cxx)
target_link_libraries(StructuredGrid ${VTK_LIBRARIES})
Download and Build StructuredGrid
Click here to download StructuredGrid and its CMakeLists.txt file. Once the tarball StructuredGrid.tar has been downloaded and extracted,
cd StructuredGrid/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:
./StructuredGrid
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.