TriangleStrip
VTKExamples/Cxx/GeometricObjects/TriangleStrip
Description
A triangle strip is a compact representation of a series of triangles. See this wikipedia article for an explanation.
Code
TriangleStrip.cxx
#include <vtkVersion.h>
#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkDataSetMapper.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkTriangleStrip.h>
int main(int, char *[])
{
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(0,0,0);
points->InsertNextPoint(0,1,0);
points->InsertNextPoint(1,0,0);
points->InsertNextPoint(1.5,1,0);
vtkSmartPointer<vtkTriangleStrip> triangleStrip =
vtkSmartPointer<vtkTriangleStrip>::New();
triangleStrip->GetPointIds()->SetNumberOfIds(4);
triangleStrip->GetPointIds()->SetId(0,0);
triangleStrip->GetPointIds()->SetId(1,1);
triangleStrip->GetPointIds()->SetId(2,2);
triangleStrip->GetPointIds()->SetId(3,3);
vtkSmartPointer<vtkCellArray> cells =
vtkSmartPointer<vtkCellArray>::New();
cells->InsertNextCell(triangleStrip);
vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(points);
polydata->SetStrips(cells);
// Create an actor and mapper
vtkSmartPointer<vtkDataSetMapper> mapper =
vtkSmartPointer<vtkDataSetMapper>::New();
#if VTK_MAJOR_VERSION <= 5
mapper->SetInput(polydata);
#else
mapper->SetInputData(polydata);
#endif
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetRepresentationToWireframe();
// 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);
renderer->AddActor(actor);
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(TriangleStrip)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(TriangleStrip MACOSX_BUNDLE TriangleStrip.cxx)
target_link_libraries(TriangleStrip ${VTK_LIBRARIES})
Download and Build TriangleStrip
Click here to download TriangleStrip and its CMakeLists.txt file. Once the tarball TriangleStrip.tar has been downloaded and extracted,
cd TriangleStrip/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:
./TriangleStrip
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.