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• OffsetAbscissasArrayName : vtkvmtkCenterlineReferenceSystemAttributesOffset
• OffsetNormalsArrayName : vtkvmtkCenterlineReferenceSystemAttributesOffset
• Omega : vtkvmtkOpenNLLinearSystemSolver
• OnePassOnly : vtkvmtkSimplifyVoronoiDiagram
• Operation : vtkvmtkGrayscaleMorphologyImageFilter
• Order : vtkvmtkGaussQuadrature , vtkvmtkTetGenWrapper
• Origin : vtkvmtkPolyDataNormalPlaneEstimator
• OriginOffset : vtkvmtkUnstructuredGridCenterlineSections
• OriginPointId : vtkvmtkPolyDataNormalPlaneEstimator
• OsculatingCenters : vtkvmtkStreamlineOsculatingCentersFilter
• OuterSurfaceCellEntityId : vtkvmtkBoundaryLayerGenerator
• OutOfPlaneBifurcationVectorAnglesArrayName : vtkvmtkCenterlineBifurcationVectors
• OutOfPlaneBifurcationVectorsArrayName : vtkvmtkCenterlineBifurcationVectors
• OutputExtent : vtkvmtkCurvedMPRImageFilter
• OutputOrigin : vtkvmtkCurvedMPRImageFilter
• OutputSmoothedLines : vtkvmtkCenterlineGeometry
• OutputSpacing : vtkvmtkCurvedMPRImageFilter
• OutputSurfaceElements : vtkvmtkTetGenWrapper
• OutputVolumeElements : vtkvmtkTetGenWrapper
• OutwardNormalsArrayName : vtkvmtkInternalTetrahedraExtractor