# Polyhedron

VTKExamples/Cxx/GeometricObjects/Polyhedron

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### Code¶

Polyhedron.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkCellArray.h>
#include <vtkCellData.h>
#include <vtkDataArray.h>
#include <vtkDataSetMapper.h>
#include <vtkIdList.h>
#include <vtkNamedColors.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkPolyhedron.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkUnstructuredGrid.h>
#include <vtkXMLUnstructuredGridWriter.h>

int main( int, char*[] )
{
vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();

// create polyhedron (cube)
vtkIdType pointIds[8] = {0, 1, 2, 3, 4, 5, 6, 7};

vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(-1.0,-1.0,-1.0);
points->InsertNextPoint( 1.0,-1.0,-1.0);
points->InsertNextPoint( 1.0, 1.0,-1.0);
points->InsertNextPoint(-1.0, 1.0,-1.0);
points->InsertNextPoint(-1.0,-1.0, 1.0);
points->InsertNextPoint( 1.0,-1.0, 1.0);
points->InsertNextPoint( 1.0, 1.0, 1.0);
points->InsertNextPoint(-1.0, 1.0, 1.0);

vtkSmartPointer<vtkCellArray> faces =
vtkSmartPointer<vtkCellArray>::New();
vtkIdType face0[4] = {0, 3, 2, 1};
vtkIdType face1[4] = {0, 4, 7, 3};
vtkIdType face2[4] = {4, 5, 6, 7};
vtkIdType face3[4] = {5, 1, 2, 6};
vtkIdType face4[4] = {0, 1, 5, 4};
vtkIdType face5[4] = {2, 3, 7, 6};

faces->InsertNextCell(4, face0);
faces->InsertNextCell(4, face1);
faces->InsertNextCell(4, face2);
faces->InsertNextCell(4, face3);
faces->InsertNextCell(4, face4);
faces->InsertNextCell(4, face5);

vtkSmartPointer<vtkUnstructuredGrid> ugrid =
vtkSmartPointer<vtkUnstructuredGrid>::New();
ugrid->SetPoints(points);
ugrid->InsertNextCell(
VTK_POLYHEDRON, 8, pointIds,
6, faces->GetPointer());

// Here we write out the cube.
vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer =
vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
writer->SetInputData(ugrid);
writer->SetFileName("polyhedron.vtu");
writer->SetDataModeToAscii();
writer->Update();

// Create a mapper and actor
vtkSmartPointer<vtkDataSetMapper> mapper =
vtkSmartPointer<vtkDataSetMapper>::New();
mapper->SetInputData(ugrid);

vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(
colors->GetColor3d("Silver").GetData());

// Visualize
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetWindowName("Polyhedron");
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);

renderer->SetBackground(colors->GetColor3d("Salmon").GetData());
renderer->ResetCamera();
renderer->GetActiveCamera()->Azimuth(30);
renderer->GetActiveCamera()->Elevation(30);
renderWindow->Render();
renderWindowInteractor->Start();

return EXIT_SUCCESS;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Polyhedron)

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


cd Polyhedron/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:

./Polyhedron


WINDOWS USERS

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