<div dir="ltr">Hi Brad, <div><br></div><div>Following commit 4c47e7d [1] of February 19th and commit defb9c1 [2] of March 1st, due to static initialization, the initialization of ObjectFactory now happens when ITK shared library are loaded [3][4].</div>
<div><br></div><div>This caused a regression in Slicer where the ObjectFactory were expected to be loaded while attempting to load an image for the first time. </div><div><br></div><div>In Slicer case, the environment variable ITK_AUTOLOAD_PATH was set during the initialization of the qSlicerCoreApplication, which is now too late.</div>
<div><br></div><div>By commenting line where a new ImageRegionSplitterSlowDimension is instantiated [5][6] and updating the method "GetImageRegionSplitter / GetGlobalDefaultSplitter" to return 0 [7][8], the initialization can happen on demand instead of when ITK libraries are loaded.</div>
<div><br></div><div>An easy solution for us would be to ensure the "ITK_AUTOLOAD_PATH" environment variable is set in the application launcher for Windows and Linux application and set in Info.plist file associated with the application bundle on MacOSX [9]</div>
<div><br></div><div>To provide more details, within Slicer we set the CMake variable ITK_NO_IO_FACTORY_REGISTER_MANAGER before doing an "include(${ITK_USE_FILE}) so that IOFactory are loaded only by calling the method "itkFactoryRegistration" associated with a shared library we named ITKFactoryRegistration. This approach allowed us to disable the automatic registration of factory in selected part of the code. More details here [10]</div>
<div><br></div><div style>It seems the new ITK commits 4c47e7d and defb9c1 prevent from completely leveraging the use of ITK_NO_IO_FACTORY_REGISTER_MANAGER variable, the code should probably be updated to consider this.</div>
<div style><br></div><div style><br></div><div style>Let me know what you think.</div><div style><br></div><div style>Thanks</div><div style>Jc</div><div><div><br></div><div><br></div><div>[1] <a href="https://github.com/Kitware/ITK/commit/4c47e7d">https://github.com/Kitware/ITK/commit/4c47e7d</a></div>
<div>[2] <a href="https://github.com/Kitware/ITK/commit/defb9c1">https://github.com/Kitware/ITK/commit/defb9c1</a></div><div>[3] <a href="https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L27">https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L27</a></div>
<div>[4] <a href="https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkObjectFactoryBase.cxx#L142-144">https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkObjectFactoryBase.cxx#L142-144</a></div>
<div>[5] <a href="https://github.com/Kitware/ITK/blob/defb9c1d084c8d55df61947587427839f9968ecf/Modules/IO/ImageBase/src/itkImageIOBase.cxx#L760">https://github.com/Kitware/ITK/blob/defb9c1d084c8d55df61947587427839f9968ecf/Modules/IO/ImageBase/src/itkImageIOBase.cxx#L760</a></div>
<div>[6] <a href="https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L27">https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L27</a></div>
<div>[7] <a href="https://github.com/Kitware/ITK/blob/defb9c1d084c8d55df61947587427839f9968ecf/Modules/IO/ImageBase/src/itkImageIOBase.cxx#L765">https://github.com/Kitware/ITK/blob/defb9c1d084c8d55df61947587427839f9968ecf/Modules/IO/ImageBase/src/itkImageIOBase.cxx#L765</a></div>
<div>[8] <a href="https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L32">https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L32</a></div>
<div>[9] <a href="http://www.herzbube.ch/blog/2009/01/how-set-environment-variables-mac-os-x-applications">http://www.herzbube.ch/blog/2009/01/how-set-environment-variables-mac-os-x-applications</a></div><div style>[10] <a href="https://github.com/Slicer/Slicer/commit/03b8961">https://github.com/Slicer/Slicer/commit/03b8961</a><a href="https://github.com/Kitware/ITK/blob/4c47e7d672bad5d83b92c2df5f293cca618e2740/Modules/Core/Common/src/itkImageSource.cxx#L27"><font color="#222222"><br>
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