# TriangleStrip

vtk-examples/Cxx/GeometricObjects/TriangleStrip

### Description¶

The triangle strip is a composite two-dimensional cell consisting of one or more triangles. The points defining the triangle strip need not lie in a plane. The triangle strip is defined by an ordered list of n+2 points, where n is the number of triangles. The ordering of the points is such that each set of three points defines a triangle.

Info

See this wikipedia article for an explanation.

Other languages

See (Python), (Java), (CSharp)

Question

### Code¶

TriangleStrip.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkDataSetMapper.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTriangleStrip.h>

int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;

vtkNew<vtkPoints> points;
points->InsertNextPoint(0, 0, 0);
points->InsertNextPoint(0, 1, 0);
points->InsertNextPoint(1, 0, 0);
points->InsertNextPoint(1.5, 1, 0);

vtkNew<vtkTriangleStrip> triangleStrip;
triangleStrip->GetPointIds()->SetNumberOfIds(4);
triangleStrip->GetPointIds()->SetId(0, 0);
triangleStrip->GetPointIds()->SetId(1, 1);
triangleStrip->GetPointIds()->SetId(2, 2);
triangleStrip->GetPointIds()->SetId(3, 3);

vtkNew<vtkCellArray> cells;
cells->InsertNextCell(triangleStrip);

vtkNew<vtkPolyData> polydata;
polydata->SetPoints(points);
polydata->SetStrips(cells);

// Create an actor and mapper
vtkNew<vtkDataSetMapper> mapper;
mapper->SetInputData(polydata);

vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(colors->GetColor3d("PeachPuff").GetData());
actor->GetProperty()->SetRepresentationToWireframe();

// Create a renderer, render window, and interactor
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->SetWindowName("TriangleStrip");
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);

renderer->SetBackground(colors->GetColor3d("DarkGreen").GetData());
renderWindow->Render();
renderWindowInteractor->Start();

return EXIT_SUCCESS;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(TriangleStrip)

find_package(VTK COMPONENTS
CommonColor
CommonCore
CommonDataModel
InteractionStyle
RenderingContextOpenGL2
RenderingCore
RenderingFreeType
RenderingGL2PSOpenGL2
RenderingOpenGL2
)

if (NOT VTK_FOUND)
message(FATAL_ERROR "TriangleStrip: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
target_link_libraries(TriangleStrip PRIVATE ${VTK_LIBRARIES} ) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS TriangleStrip MODULES${VTK_LIBRARIES}
)


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

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