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SceneBounds

vtk-examples/Cxx/Visualization/SceneBounds


Question

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Code

SceneBounds.cxx

#include <vtkActor.h>
#include <vtkAssembly.h>
#include <vtkAxesActor.h>
#include <vtkCamera.h>
#include <vtkCubeSource.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkOrientationMarkerWidget.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkPropAssembly.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkTransform.h>

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

  // Create a sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->Update();

  vtkNew<vtkPolyDataMapper> sphereMapper;
  sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
  vtkNew<vtkActor> sphereActor;
  sphereActor->SetMapper(sphereMapper);
  sphereActor->GetProperty()->SetColor(
      colors->GetColor3d("MistyRose").GetData());

  // Create a cube
  vtkNew<vtkCubeSource> cubeSource;
  cubeSource->SetCenter(5.0, 0.0, 0.0);
  cubeSource->Update();

  vtkNew<vtkPolyDataMapper> cubeMapper;
  cubeMapper->SetInputConnection(cubeSource->GetOutputPort());
  vtkNew<vtkActor> cubeActor;
  cubeActor->SetMapper(cubeMapper);
  cubeActor->GetProperty()->SetColor(colors->GetColor3d("Thistle").GetData());

  // Visualization
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("SceneBounds");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(sphereActor);
  renderer->AddActor(cubeActor);
  renderer->SetBackground(colors->GetColor3d("CadetBlue").GetData());

  renderWindow->Render();
  renderer->GetActiveCamera()->Zoom(0.9);

  double bounds[6];
  renderer->ComputeVisiblePropBounds(bounds);
  std::cout << bounds[0] << " " << bounds[1] << " " << bounds[2] << " "
            << bounds[3] << " " << bounds[4] << " " << bounds[5] << std::endl;
  renderWindow->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(SceneBounds)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  CommonTransforms
  FiltersSources
  InteractionStyle
  InteractionWidgets
  RenderingAnnotation
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

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

Download and Build SceneBounds

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

cd SceneBounds/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:

./SceneBounds

WINDOWS USERS

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