Point

VTKExamples/Cxx/GeometricObjects/Point

Description¶

vtkPoints object represents 3D points. The data model for vtkPoints is an array of vx-vy-vz triplets accessible by (point or cell) id.

Other Languages

See (Python), (CSharp)

Question

Code¶

Point.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkNamedColors.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>

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

// Create the geometry of a point (the coordinate)
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
const float p[3] = {1.0, 2.0, 3.0};

// Create the topology of the point (a vertex)
vtkSmartPointer<vtkCellArray> vertices =
vtkSmartPointer<vtkCellArray>::New();
// We need an an array of point id's for InsertNextCell.
vtkIdType pid[1];
pid[0] = points->InsertNextPoint(p);
vertices->InsertNextCell(1,pid);

// Create a polydata object
vtkSmartPointer<vtkPolyData> point =
vtkSmartPointer<vtkPolyData>::New();

// Set the points and vertices we created as the geometry and topology of the polydata
point->SetPoints(points);
point->SetVerts(vertices);

// Visualize
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputData(point);

vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
actor->GetProperty()->SetPointSize(20);

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

renderer->SetBackground(colors->GetColor3d("DarkOliveGreen").GetData());

renderWindow->Render();
renderWindowInteractor->Start();

return EXIT_SUCCESS;
}


CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Point)

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


cd Point/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:

./Point


WINDOWS USERS

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