# 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.

Question

### Code¶

StructuredGrid.cxx

#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();
mapper->SetInputData(structuredGrid);

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();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);

// Add the actor to the scene
renderer->SetBackground(.3, .6, .3); // Background color green

// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();

return EXIT_SUCCESS;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(StructuredGrid)

find_package(VTK COMPONENTS
vtkCommonCore
vtkCommonDataModel
vtkIOXML
vtkInteractionStyle
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping StructuredGrid: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION:${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE}) add_executable(StructuredGrid MACOSX_BUNDLE StructuredGrid.cxx ) target_link_libraries(StructuredGrid PRIVATE${VTK_LIBRARIES})
else ()
# include all components
target_link_libraries(StructuredGrid PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS StructuredGrid MODULES${VTK_LIBRARIES}
)
endif ()


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

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