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# MarchingCasesA

VTKEx/Cxx/VisualizationAlgorithms/MarchingCasesA

### Description

Marching cubes cases for 3D isosurface generation. The 256 possible cases have been reduced to 15 cases using symmetry. Red vertices are greater than the selected isosurface value.

This example runs the example MarchingCases with the arguments 15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14.

Info

See Figure 6-6 in Chapter 6 the VTK Textbook.

Other languages

See (Python)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### Code

MarchingCasesA.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkContourFilter.h>
    #include <vtkCubeSource.h>
    #include <vtkExtractEdges.h>
    #include <vtkFloatArray.h>
    #include <vtkGlyph3D.h>
    #include <vtkIdList.h>
    #include <vtkNamedColors.h>
    #include <vtkPointData.h>
    #include <vtkPoints.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkShrinkPolyData.h>
    #include <vtkSphereSource.h>
    #include <vtkThresholdPoints.h>
    #include <vtkTransform.h>
    #include <vtkTransformPolyDataFilter.h>
    #include <vtkTubeFilter.h>
    #include <vtkUnstructuredGrid.h>
    #include <vtkVectorText.h>

    #include "MarchingCases.cxx"

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(MarchingCasesA)

    find_package(VTK COMPONENTS
      vtkvtkCommonColor
      vtkvtkCommonCore
      vtkvtkCommonDataModel
      vtkvtkCommonTransforms
      vtkvtkFiltersCore
      vtkvtkFiltersExtraction
      vtkvtkFiltersGeneral
      vtkvtkFiltersSources
      vtkvtkInteractionStyle
      vtkvtkRenderingContextOpenGL2
      vtkvtkRenderingCore
      vtkvtkRenderingFreeType
      vtkvtkRenderingGL2PSOpenGL2
      vtkvtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping MarchingCasesA: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(MarchingCasesA MACOSX_BUNDLE MarchingCasesA.cxx )
      target_link_libraries(MarchingCasesA PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(MarchingCasesA MACOSX_BUNDLE MarchingCasesA.cxx )
      target_link_libraries(MarchingCasesA PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS MarchingCasesA
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build MarchingCasesA

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

    cd MarchingCasesA/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:

    ./MarchingCasesA

WINDOWS USERS

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