QuadricLODActor

Description¶

If you have a fast graphics card you may not see a difference with the sphere model.

Question

If you have a question about this example, please use the VTK Discourse Forum

Code¶

QuadricLODActor.cxx

#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkQuadricLODActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>

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

  // High res sphere.
  vtkNew<vtkSphereSource> highResSphereSource;
  highResSphereSource->SetThetaResolution(200);
  highResSphereSource->SetPhiResolution(200);
  highResSphereSource->Update();

  vtkNew<vtkPolyDataMapper> highResMapper;
  highResMapper->SetInputConnection(highResSphereSource->GetOutputPort());

  vtkNew<vtkQuadricLODActor> actor;
  actor->SetMapper(highResMapper);
  actor->GetProperty()->SetInterpolationToFlat();
  actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

  // A renderer and render window.
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("QuadricLODActor");

  // An interactor.
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderWindowInteractor->SetDesiredUpdateRate(1e20);

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

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

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(QuadricLODActor)

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

if (NOT VTK_FOUND)
  message(FATAL_ERROR "QuadricLODActor: 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.")
add_executable(QuadricLODActor MACOSX_BUNDLE QuadricLODActor.cxx )
  target_link_libraries(QuadricLODActor PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS QuadricLODActor
  MODULES ${VTK_LIBRARIES}
)

Download and Build QuadricLODActor¶

Click here to download QuadricLODActor and its CMakeLists.txt file. Once the tarball QuadricLODActor.tar has been downloaded and extracted,

cd QuadricLODActor/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:

./QuadricLODActor

WINDOWS USERS

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