TriangleStrip

VTKExamples/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

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code¶

TriangleStrip.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkDataSetMapper.h>
#include <vtkNamedColors.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<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();

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();
mapper->SetInputData(polydata);

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

// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetWindowName("Triangle Strip");
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);

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

return EXIT_SUCCESS;
}


CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(TriangleStrip)

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


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.