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ConesOnSphere

Repository source: ConesOnSphere

Description

Generate a sphere and position a cone at the center of each cell on the sphere, aligned with the face normal.

Taken from VTK 9.4: A Step Closer to the Ways of Python

Other languages

See (PythonicAPI)

Question

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

Code

ConesOnSphere.cxx

#include <vtkActor.h>
#include <vtkCameraOrientationWidget.h>
#include <vtkCellCenters.h>
#include <vtkConeSource.h>
#include <vtkGlyph3D.h>
#include <vtkInteractorStyleSwitch.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkPolyDataNormals.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>

#include <array>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;
  colors->SetColor("ParaViewBkg",
                   std::array<unsigned char, 4>{82, 87, 110, 255}.data());

  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->SetCenter(0.0, 0.0, 0.0);
  sphereSource->SetRadius(0.5);
  sphereSource->SetPhiResolution(16);
  sphereSource->SetThetaResolution(16);
  sphereSource->LatLongTessellationOff();

  vtkNew<vtkConeSource> coneSource;
  coneSource->SetCenter(0.0, 0.0, 0.0);
  coneSource->SetRadius(0.08);
  coneSource->SetHeight(0.03);
  coneSource->SetResolution(30);

  vtkNew<vtkPolyDataNormals> normals;
  normals->ComputeCellNormalsOn();
  normals->SetInputConnection(sphereSource->GetOutputPort());

  vtkNew<vtkCellCenters> cellCenters;
  cellCenters->SetInputConnection(normals->GetOutputPort());

  vtkNew<vtkGlyph3D> glyphFilter;
  glyphFilter->OrientOn();
  glyphFilter->SetVectorModeToUseNormal();
  glyphFilter->SetSourceConnection(coneSource->GetOutputPort());
  glyphFilter->SetInputConnection(cellCenters->GetOutputPort());

  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(glyphFilter->GetOutputPort());

  vtkNew<vtkProperty> actorProp;
  actorProp->SetColor(colors->GetColor3d("Peru").GetData());
  actorProp->SetEdgeColor(colors->GetColor3d("DarkSlateBlue").GetData());
  actorProp->EdgeVisibilityOff();

  vtkNew<vtkActor> actor;
  actor->SetProperty(actorProp);
  actor->SetMapper(mapper);

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetSize(600, 600);
  renderWindow->SetWindowName("ConesOnSphere");
  renderWindow->AddRenderer(renderer);
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);
  auto is = vtkInteractorStyleSwitch::SafeDownCast(
      renderWindowInteractor->GetInteractorStyle());
  if (is)
  {
    is->SetCurrentStyleToTrackballCamera();
  }

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

  vtkNew<vtkCameraOrientationWidget> cow;
  cow->SetParentRenderer(renderer);
  // Enable the widget.
  cow->On();

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ConesOnSphere)

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

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

Download and Build ConesOnSphere

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

cd ConesOnSphere/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:

./ConesOnSphere

WINDOWS USERS

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