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SphereSource

Repository source: SphereSource

Description

vtkSphereSource object creates a sphere (represented by polygons) of specified radius centered at the origin.

The resolution (polygonal discretization) in both the latitude (phi) and longitude (theta) directions can be specified.

It also is possible to create partial spheres by specifying maximum phi and theta angles. By default, the surface tessellation of the sphere uses triangles; however you can set LatLongTessellation to produce a tessellation using quadrilaterals.

Other languages

See (PythonicAPI)

Question

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

Code

SphereSource.cxx

#include <vtkActor.h>
#include <vtkCameraOrientationWidget.h>
#include <vtkInteractorStyleSwitch.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.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());

  // Create a sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->SetCenter(0.0, 0.0, 0.0);
  sphereSource->SetRadius(5.0);
  // Make the surface smooth.
  sphereSource->SetPhiResolution(50);
  sphereSource->SetThetaResolution(50);
  sphereSource->LatLongTessellationOff();

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

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

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

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetSize(600, 600);
  renderWindow->SetWindowName("SphereSource");
  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(SphereSource)

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

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

Download and Build SphereSource

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

cd SphereSource/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:

./SphereSource

WINDOWS USERS

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