Merge pull request #6229 from hjmjohnson/ingest-SubdivisionQuadEdgeMeshFilter

ENH: Ingest ITKSubdivisionQuadEdgeMeshFilter into Modules/Filtering (v4, stacks on #6204)

Author: hjmjohnson

Modules/Filtering/SubdivisionQuadEdgeMeshFilter/CMakeLists.txt

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+project(SubdivisionQuadEdgeMeshFilter)
+
+itk_module_impl()

Modules/Filtering/SubdivisionQuadEdgeMeshFilter/LICENSE

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Modules/Filtering/SubdivisionQuadEdgeMeshFilter/README.md

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+# SubdivisionQuadEdgeMeshFilter
+
+In-tree ITK module providing triangle- and edge-based subdivision
+filters for `itk::QuadEdgeMesh`. The filters refine a coarse triangular
+quad-edge mesh into a finer one using classical subdivision schemes
+(Loop, Modified Butterfly, Square Three, Linear), with both cell-based
+and edge-based variants and a conditional/criterion-driven dispatcher
+for adaptive refinement.
+
+The flagship classes are
+`itk::SubdivisionQuadEdgeMeshFilter`,
+`itk::TriangleCellSubdivisionQuadEdgeMeshFilter`,
+`itk::TriangleEdgeCellSubdivisionQuadEdgeMeshFilter`,
+`itk::ConditionalSubdivisionQuadEdgeMeshFilter`, and the concrete
+`Loop`, `LinearTriangle`, `ModifiedButterfly`, and `SquareThree`
+specializations.
+
+## Origin
+
+Ingested from the standalone remote module
+[**InsightSoftwareConsortium/itkSubdivisionQuadEdgeMeshFilter**](https://github.com/InsightSoftwareConsortium/itkSubdivisionQuadEdgeMeshFilter)
+on 2026-05-07 via the v4 ingestion pipeline. The upstream repository
+will be archived read-only after this PR merges; it remains reachable
+at the URL above for historical reference.
+
+## References
+
+- Zhu W. *Triangle Mesh Subdivision.* The Insight Journal. 2010.
+  <https://doi.org/10.54294/vw0ke0>

Modules/Filtering/SubdivisionQuadEdgeMeshFilter/include/itkCellAreaTriangleCellSubdivisionCriterion.h

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+/*=========================================================================
+ *
+ *  Copyright NumFOCUS
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *=========================================================================*/
+
+#ifndef itkCellAreaTriangleCellSubdivisionCriterion_h
+#define itkCellAreaTriangleCellSubdivisionCriterion_h
+
+#include "itkQuadEdgeMeshSubdivisionCriterion.h"
+#include "itkObjectFactory.h"
+#include "itkTriangleHelper.h"
+#include "itkNumericTraits.h"
+
+
+namespace itk
+{
+/**
+ *\class CellAreaTriangleCellSubdivisionCriterion
+ *\brief
+ *\ingroup SubdivisionQuadEdgeMeshFilter
+ */
+template <typename TSubdivisionFilter>
+class CellAreaTriangleCellSubdivisionCriterion : public QuadEdgeMeshSubdivisionCriterion<TSubdivisionFilter>
+{
+public:
+  using Self = CellAreaTriangleCellSubdivisionCriterion;
+  using Superclass = QuadEdgeMeshSubdivisionCriterion<TSubdivisionFilter>;
+  using Pointer = SmartPointer<Self>;
+  using ConstPointer = SmartPointer<const Self>;
+
+  using MeshType = typename Superclass::MeshType;
+  using MeshPointer = typename Superclass::MeshPointer;
+  using MeshConstPointer = typename Superclass::MeshConstPointer;
+  using PointsContainerPointer = typename Superclass::PointsContainerPointer;
+  using PointsContainerConstIterator = typename Superclass::PointsContainerConstIterator;
+  using PointsContainerIterator = typename Superclass::PointsContainerIterator;
+  using CellsContainer = typename Superclass::CellsContainer;
+  using CellsContainerPointer = typename Superclass::CellsContainerPointer;
+  using CellsContainerIterator = typename Superclass::CellsContainerIterator;
+  using CellsContainerConstIterator = typename Superclass::CellsContainerConstIterator;
+  using PointType = typename Superclass::PointType;
+  using CoordinateType = typename Superclass::CoordinateType;
+  using PointIdentifier = typename Superclass::PointIdentifier;
+  using CellIdentifier = typename Superclass::CellIdentifier;
+  using CellType = typename Superclass::CellType;
+  using QEType = typename Superclass::QEType;
+  using PointIdIterator = typename Superclass::PointIdIterator;
+  using SubdivisionCellContainer = typename Superclass::SubdivisionCellContainer;
+
+  /** Run-time type information (and related methods).   */
+  itkOverrideGetNameOfClassMacro(CellAreaTriangleCellSubdivisionCriterion);
+  itkNewMacro(Self);
+
+  void
+  Compute(MeshType * mesh, SubdivisionCellContainer & cellIds) override;
+
+  itkGetConstMacro(MaximumArea, CoordinateType);
+  itkSetMacro(MaximumArea, CoordinateType);
+
+protected:
+  CellAreaTriangleCellSubdivisionCriterion() { m_MaximumArea = NumericTraits<CoordinateType>::max(); }
+  ~CellAreaTriangleCellSubdivisionCriterion() override = default;
+
+private:
+  CoordinateType m_MaximumArea;
+};
+
+} // namespace itk
+#ifndef ITK_MANUAL_INSTANTIATION
+#  include "itkCellAreaTriangleCellSubdivisionCriterion.hxx"
+#endif
+
+#endif

Modules/Filtering/SubdivisionQuadEdgeMeshFilter/include/itkCellAreaTriangleCellSubdivisionCriterion.hxx

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+/*=========================================================================
+ *
+ *  Copyright NumFOCUS
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *=========================================================================*/
+
+#ifndef itkCellAreaTriangleCellSubdivisionCriterion_hxx
+#define itkCellAreaTriangleCellSubdivisionCriterion_hxx
+
+
+namespace itk
+{
+template <typename TTriangleCellSubdivisionFilter>
+void
+CellAreaTriangleCellSubdivisionCriterion<TTriangleCellSubdivisionFilter>::Compute(MeshType *                 mesh,
+                                                                                  SubdivisionCellContainer & cellIds)
+{
+  cellIds.clear();
+  const CellsContainer * cells = mesh->GetCells();
+  if (!cells)
+  {
+    itkExceptionMacro("<<Input mesh has not cells");
+  }
+
+  CellsContainerConstIterator cter = cells->Begin();
+  while (cter != cells->End())
+  {
+    CellType * cell = cter->Value();
+    if (!cell || cell->GetType() != CellGeometryEnum::POLYGON_CELL || cell->GetNumberOfPoints() != 3)
+    {
+      continue;
+    }
+
+    PointType       pointArray[3];
+    PointIdIterator pter = cell->PointIdsBegin();
+    PointIdentifier nn = 0;
+
+    while (pter != cell->PointIdsEnd())
+    {
+      mesh->GetPoint(*pter, &pointArray[nn]);
+      ++pter;
+      ++nn;
+    }
+
+    CoordinateType area = TriangleHelper<PointType>::ComputeArea(pointArray[0], pointArray[1], pointArray[2]);
+    if (area > m_MaximumArea)
+    {
+      cellIds.push_back(static_cast<typename SubdivisionCellContainer::value_type>(cter->Index()));
+    }
+
+    ++cter;
+  }
+}
+
+} // namespace itk
+#endif