[CMake] How to use VTK as an ExternalProject

[Nicolas Rannou]

Hello,

I would like to set up a "superbuild" for my project.
I would like it to be as clean/basic as possible.

Let's say I want to build VTK as my "ExternalProject". How should I 
proceed to link it to my current project.

My current project requires VTK to be built.
So FIND_PACKAGE cannot work. (vtk source code not there during the 
configuration step)
And I didn't get any success manually setting VTK_DIR, VTK_INCLUDE_DIRS, 
etc. at the end of my External-VTK.cmake file. Is it the way to go?

How should I proceed to do it?
Is there any tutorial on the net? (I couldn't find any)
I had a look at CTK's and Slicer's superbuilds but we would like 
something more basic and straight forward. Is it possible?
Is there a special option in CMake/ExternalProjects to be enabled or 
anything we can do about it?

A workaround was to build "myProject" as an ExternalProject linked to 
the "VTK ExternalProject", and to turn off USE_SUPERBUILD but I don't 
really like this solution.

Any help would be greatly appreciated,

Thanks

*_CMAKELISTS.TXT_
PROJECT*( MYPROJECT )
...
*OPTION*( USE_SUPERBUILD "Use SuperBuild" ON )
...
*IF*( USE_SUPERBUILD )
*INCLUDE*( "${GOFIGURE2_SOURCE_DIR}/CMake/SuperBuild/External-VTK.cmake" )
*ENDIF*( USE_SUPERBUILD )
...
*FIND_PACKAGE*( VTK )??? //NOT WORKING
...
_*
External-VTK.cmake*_

set(proj VTK)
...
   ExternalProject_Add(${proj}
     SOURCE_DIR ${CMAKE_BINARY_DIR}/${proj}
     BINARY_DIR ${proj}-build
     GIT_REPOSITORY "${git_protocol}://vtk.org/VTK.git"
     GIT_TAG "origin/release"
     CMAKE_GENERATOR ${gen}
     CMAKE_ARGS
       ${ep_common_args}
       -DBUILD_EXAMPLES:BOOL=OFF
       -DBUILD_SHARED_LIBS:BOOL=ON
       -DCMAKE_CXX_FLAGS:STRING=${ep_common_cxx_flags}
       -DCMAKE_C_FLAGS:STRING=${ep_common_c_flags}
       -DVTK_USE_PARALLEL:BOOL=ON
       -DVTK_DEBUG_LEAKS:BOOL=${USE_VTK_DEBUG_LEAKS}
       -DVTK_USE_RPATH:BOOL=ON
       -DVTK_INSTALL_LIB_DIR:PATH=${MyProject_INSTALL_LIB_DIR}
       ${VTK_QT_ARGS}
       ${VTK_MAC_ARGS}
     INSTALL_COMMAND ""
     DEPENDS
       ${VTK_DEPENDENCIES}
     )
...
set(VTK_DIR ${CMAKE_BINARY_DIR}/${proj}-build)??? // NOT WORKING
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