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¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
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.