Point
vtk-examples/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.
Question
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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 <vtkNew.h>
int main(int, char *[])
{
vtkNew<vtkNamedColors> colors;
// Create the geometry of a point (the coordinate)
vtkNew<vtkPoints> points;
const float p[3] = {1.0, 2.0, 3.0};
// Create the topology of the point (a vertex)
vtkNew<vtkCellArray> vertices;
// 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
vtkNew<vtkPolyData> point;
// Set the points and vertices we created as the geometry and topology of the
// polydata
point->SetPoints(points);
point->SetVerts(vertices);
// Visualize
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputData(point);
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
actor->GetProperty()->SetPointSize(20);
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->SetWindowName("Point");
renderWindow->AddRenderer(renderer);
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("DarkGreen").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
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
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
add_executable(Point MACOSX_BUNDLE Point.cxx )
target_link_libraries(Point PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS Point
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build Point¶
Click here to download Point and its CMakeLists.txt file. Once the tarball Point.tar has been downloaded and extracted,
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.