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ImageNoiseSource

vtk-examples/Cxx/Images/ImageNoiseSource


Question

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Code

ImageNoiseSource.cxx

#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageNoiseSource.h>
#include <vtkInteractorStyleImage.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

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

  // Create an image of noise
  vtkNew<vtkImageNoiseSource> noiseSource;
  noiseSource->SetWholeExtent(0, 200, 0, 200, 0, 0);
  noiseSource->SetMinimum(0.0);
  noiseSource->SetMaximum(255.0);

  vtkNew<vtkImageCast> castFilter;
  castFilter->SetInputConnection(noiseSource->GetOutputPort());
  castFilter->SetOutputScalarTypeToUnsignedChar();

  // Create an actor
  vtkNew<vtkImageActor> actor;
  actor->GetMapper()->SetInputConnection(castFilter->GetOutputPort());

  // Setup renderer
  vtkNew<vtkRenderer> renderer;
  renderer->AddActor(actor);
  renderer->ResetCamera();
  renderer->SetBackground(colors->GetColor3d("Wheat").GetData());

  // Setup render window
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetWindowName("ImageNoiseSource");

  renderWindow->AddRenderer(renderer);

  // Setup render window interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  vtkNew<vtkInteractorStyleImage> style;

  renderWindowInteractor->SetInteractorStyle(style);

  // Render and start interaction
  renderWindowInteractor->SetRenderWindow(renderWindow);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ImageNoiseSource)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  ImagingCore
  ImagingSources
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
  QUIET
)

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

Download and Build ImageNoiseSource

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

cd ImageNoiseSource/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:

./ImageNoiseSource

WINDOWS USERS

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