COMP: Keep GeodesicActiveContour example working on ITK 5.4 and 6.0 - #476
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hjmjohnson merged 2 commits intoSep 2, 2026
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…ists src/External and src/GPU hold no examples yet, but src/CMakeLists.txt calls add_subdirectory() on both, so each needs a CMakeLists.txt. With those files empty, gersemi wrote a lone newline and end-of-file-fixer stripped it back, so `pre-commit run --all-files` never converged. Documenting why the files exist gives both hooks something to agree on. Also applies gersemi's pending reformat of ComputeCurvatureAnisotropicDiffusion/CMakeLists.txt.
ITK 6.0 wraps VectorContainer<IdentifierType, LevelSetNode<...>>; ITK 5.4 wraps VectorContainer<unsigned int, LevelSetNode<...>>. The two mangled template keys are disjoint, so a single spelling cannot run on both. Verified against ITK 5.4.6: the example completes in 171 iterations with RMS change 0.0198.
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Looks good. Rebase on main before merging.
hjmjohnson
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September 2, 2026 21:54
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SegmentWithGeodesicActiveContourLevelSet/Code.pyhard-codesitk.VectorContainer[itk.UI, LevelSetNode], which ITK 6.0 no longer wraps after InsightSoftwareConsortium/ITK#6803. Selecting the index type at runtime keeps the example working on both 5.4 and 6.0.Why a single spelling cannot cover both
ITK#6803 changes
LevelSetTypeDefault::NodeContainerfromVectorContainer<unsigned int, NodeType>to the one-argumentVectorContainer<NodeType>, whose index type isSizeValueType, and updatesITKFastMarchingBase.wrapaccordingly.The wrapping registry is keyed by the mangled name emitted by that one
itk_wrap_templatecall, so the two spellings are strictly disjoint across the version boundary — there is no release where both resolve:itk.VectorContainer[itk.UI, LevelSetNode]itk.VectorContainer[itk.IT, LevelSetNode]TemplateTypeErrorTemplateTypeErrorConfirmed empirically against ITK 5.4.6, and
ITKFastMarchingBase.wrapis byte-identical atv5.4.7,release-5.4andmain-before-#6803.itk.TemplateTypeErrorsubclassesTypeError, which is what the guard catches.Test
Ran the example end to end against ITK 5.4.6 on
BrainProtonDensitySlice.png(theexceptbranch, which ITK's own CI cannot reach): exit 0, 171 iterations, RMS change 0.0198, output written.NodeTypeis also hoisted so the template is spelled once rather than twice.