# PineRootConnectivityA

VTKExamples/Cxx/VisualizationAlgorithms/PineRootConnectivityA

### Description

This example applies connectivity filter to remove noisy isosurface. Data is from 256^3 volume data of the root system of a pine tree.

The example runs PineRootConnectivity as follows:

    PineRootConnectivityA pine_root.tri 1)

Info

See Figure 9-51a in Chapter 9 The VTK Textbook.

Other Languages

See (Python)

### Code

PineRootConnectivityA.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkNamedColors.h>
    #include <vtkPointData.h>
    #include <vtkPointSource.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkStreamTracer.h>
    #include <vtkStructuredGrid.h>
    #include <vtkStructuredGridGeometryFilter.h>
    #include <vtkStructuredGridOutlineFilter.h>
    #include <vtkStructuredGridReader.h>

    #include "PineRootConnectivity.cxx"

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(PineRootConnectivityA)

    find_package(VTK COMPONENTS
      vtkCommonColor
      vtkCommonDataModel
      vtkFiltersCore
      vtkFiltersFlowPaths
      vtkFiltersGeometry
      vtkFiltersSources
      vtkIOLegacy
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping PineRootConnectivityA: ${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(PineRootConnectivityA MACOSX_BUNDLE PineRootConnectivityA.cxx )
      target_link_libraries(PineRootConnectivityA PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(PineRootConnectivityA MACOSX_BUNDLE PineRootConnectivityA.cxx )
      target_link_libraries(PineRootConnectivityA PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS PineRootConnectivityA
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build PineRootConnectivityA

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

    cd PineRootConnectivityA/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:

    ./PineRootConnectivityA

WINDOWS USERS

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