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DiscretizableColorTransferFunction

vtk-examples/Cxx/Utilities/DiscretizableColorTransferFunction

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Question

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Code

DiscretizableColorTransferFunction.cxx

#include <vtkDiscretizableColorTransferFunction.h>
#include <vtkNew.h>

int main(int, char*[])
{
  vtkNew<vtkDiscretizableColorTransferFunction>
      discretizableColorTransferFunction;

  discretizableColorTransferFunction->DiscretizeOn();
  discretizableColorTransferFunction->SetNumberOfValues(2);

  discretizableColorTransferFunction->AddRGBPoint(0.0, 1, 0, 0);
  discretizableColorTransferFunction->AddRGBPoint(10.0, 0, 1, 0);
  discretizableColorTransferFunction->Build();

  double color[3];
  discretizableColorTransferFunction->GetColor(1.0, color);
  std::cout << color[0] << " " << color[1] << " " << color[2] << std::endl;

  discretizableColorTransferFunction->GetColor(5.0, color);
  std::cout << color[0] << " " << color[1] << " " << color[2] << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(DiscretizableColorTransferFunction)

find_package(VTK COMPONENTS 
)

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

Download and Build DiscretizableColorTransferFunction

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

cd DiscretizableColorTransferFunction/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:

./DiscretizableColorTransferFunction

WINDOWS USERS

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