- o -
- OBBCount
: vtkOBBTree
- Object
: vtkSmartPointerBase
, vtkWeakPointerBase
- ObjectAreas
: vtkMultiObjectMassProperties
- ObjectCache
: vtkADIOSReader
- ObjectId
: vtkExodusIICacheKey
- ObjectIds
: vtkMultiObjectMassProperties
- ObjectTruth
: vtkExodusIIReaderPrivate::ArrayInfoType
- ObjectType
: vtkExodusIICacheKey
- ObjectValidity
: vtkMultiObjectMassProperties
- ObjectVolumes
: vtkMultiObjectMassProperties
- OBJFileComment
: vtkOBJExporter
- ObliqueAngles
: vtkCamera
- ObliquePlane
: vtkBoundedPlanePointPlacer
, vtkConstrainedPointHandleRepresentation
- Observer
: vtkDataRepresentation
, vtkOrientationMarkerWidget
, vtkTextRepresentation
- ObserverMap
: vtkObserverMediator
- ObserverMediator
: vtkInteractorObserver
, vtkRenderWindowInteractor
- Observers
: vtkSMPProgressObserver
- ObserverTag
: vtkEdgeLayout
, vtkOpenVRControlsHelper
- ObserverTags
: vtkImageOrthoPlanes
- ObservingAbort
: vtkParallelRenderManager
- ObservingRenderWindow
: vtkParallelRenderManager
- occlusion
: OcclusionPRD
- OcclusionCull
: vtkGL2PSExporter
- OcclusionRatio
: vtkDepthPeelingPass
, vtkRenderer
- OcclusionThreshold
: vtkDualDepthPeelingPass
- OccupiedValue
: vtkPointOccupancyFilter
- OctantBounds
: vtkCellLocator
- ODepthBuffer
: vtkOSPRayRendererNode
- OffScreenInitialized
: vtkCocoaRenderWindow
, vtkIOSRenderWindow
- OffScreenOnlyMode
: vtkGraphicsFactory
- OffScreenRendering
: vtkWindow
- OffScreenUseFrameBuffer
: vtkOpenGLRenderWindow
- Offset
: LSDynaFamily::LSDynaFamilySectionMark
, vtkArcPlotter
, vtkBalloonRepresentation
, vtkDelaunay2D
, vtkDelaunay3D
, vtkFitToHeightMapFilter
, vtkFocalPlanePointPlacer
, vtkIconGlyphFilter
, vtkMaskPoints
, vtkMaskPolyData
, vtkMeasurementCubeHandleRepresentation3D
, vtkOpenGLContextDevice2D::Private
, vtkPlotBar
, vtkPolygonalHandleRepresentation3D
, vtkRuledSurfaceFilter
, vtkTubeFilter
- OffsetFromOrigin
: vtkAMRSliceFilter
- Offsets
: vtkStaticCellLinksTemplate< TIds >
- OFrameBuffer
: vtkOSPRayRendererNode
- OGRRegistered
: vtkGDALVectorReader
- Older
: vtkGeoTreeNode
- Oldest
: vtkGeoTreeNodeCache
- OldHookFunction
: vtkMILVideoSource
- OldImageSampleDistance
: vtkFixedPointVolumeRayCastMapper
- OldPalette
: vtkWin32OpenGLRenderWindow
- OldPos
: vtkInteractorStyleUser
- OldProc
: vtkWin32RenderWindowInteractor
- OldRowBounds
: vtkFixedPointVolumeRayCastMapper
- OldSampleDistance
: vtkFixedPointVolumeRayCastMapper
- OldScreen
: vtkRenderWindow
- OldUserDataPtr
: vtkMILVideoSource
- OmniList
: vtk3DSImporter
- OModel
: vtkOSPRayRendererNode
- OnASphere
: vtkMPASReader
- OneMinusWeight
: vtkTemporalInterpolatedVelocityField
- OnIn
: vtkBooleanTexture
- OnionPeel
: vtkYoungsMaterialInterface
- OnOn
: vtkBooleanTexture
- OnOut
: vtkBooleanTexture
- OnRatio
: vtkEarthSource
, vtkMaskPoints
, vtkMaskPolyData
, vtkRuledSurfaceFilter
, vtkTubeFilter
- OnScreenInitialized
: vtkCocoaRenderWindow
, vtkIOSRenderWindow
- Opacity
: vtkAffineRepresentation2D
, vtkCompositeMapperHelperData
, vtkCompositePolyDataMapper2::RenderBlockState
, vtkContextItem
, vtkImageBlend
, vtkImageProperty
, vtkOptiXCompositePolyDataMapper2Node::RenderBlockState
, vtkOSPRayCompositePolyDataMapper2Node::RenderBlockState
, vtkProperty2D
, vtkProperty
, vtkTextProperty
, vtkVideoSource
- OpacityArray
: vtkPointGaussianMapper
- OpacityArrayComponent
: vtkPointGaussianMapper
- OpacityArrayLength
: vtkImageBlend
- OpacityFunction
: vtkCompositeControlPointsItem
, vtkCompositeTransferFunctionItem
- OpacityOffset
: vtkOpenGLPointGaussianMapper
- OpacityPointHandle
: vtkCompositeControlPointsItem
- OpacityScale
: vtkOpenGLPointGaussianMapper
- OpacityTable
: vtkOpenGLPointGaussianMapper
- OpacityTables
: vtkVolumeInputHelper
- OpacityTableSize
: vtkPointGaussianMapper
- OpacityTablesMap
: vtkVolumeInputHelper
- OpacityTableUpdateTime
: vtkOpenGLPointGaussianMapper
- OpaqueFlag
: vtkLookupTable
- OpaqueFlagBuildTime
: vtkLookupTable
- OpaquePass
: vtkRenderStepsPass
- OpaqueRGBATexture
: vtkDepthPeelingPass
- OpaqueSequence
: vtkShadowMapBakerPass
, vtkShadowMapPass
- OpaqueZTexture
: vtkDepthPeelingPass
- OpenedFileName
: vtkNetCDFPOPReader
, vtkPNetCDFPOPReader
- OpenElements
: vtkXMLDataParser
- OpenElementsSize
: vtkXMLDataParser
- OpenGLActor
: vtkOpenGLSkybox
- OpenGLExtensionsSupported
: vtkImageDataLIC2D
- OpenGLMajorVersion
: vtkOpenGLShaderCache
- OpenGLMinorVersion
: vtkOpenGLShaderCache
- OpenGLSupportMessage
: vtkOpenGLRenderWindow
- OpenGLSupportResult
: vtkOpenGLRenderWindow
- OpenGLSupportTested
: vtkOpenGLRenderWindow
- OpenVertices
: vtkDijkstraGraphInternals
- OpenVRRenderModels
: vtkOpenVRRenderWindow
- Operation
: vtkImageLogic
, vtkImageMaskBits
, vtkImageMathematics
, vtkImageSlab
, vtkMatrixMathFilter
- operation_type_strings
: vtkViewNode
- OperationType
: vtkImplicitBoolean
, vtkRearrangeFields::Operation
- OperationTypeNames
: vtkRearrangeFields
- Operator
: vtkMultiThreshold::BooleanSet
, vtkTemporalArrayOperatorFilter
- Optimization
: vtkImageReslice
- OptimizedTransform
: vtkImageReslice
- OptimizeOnInteractorEvents
: vtkPickingManager
- OptiXPtxLoader
: vtkOptiXRendererNode
- Order
: vtkImageButterworthHighPass
, vtkImageButterworthLowPass
, vtkLagrangeCurve
, vtkLagrangeHexahedron
, vtkLagrangeQuadrilateral
, vtkLagrangeTetra
, vtkLagrangeTriangle
, vtkLagrangeWedge
- ORenderer
: vtkOSPRayRendererNode
- Orient
: vtkGenericGlyph3DFilter
, vtkGlyph3D
, vtkGlyph3DMapper
- Orientation
: vtkAdaptiveDataSetSurfaceFilter
, vtkAxisExtended
, vtkBoxClipDataSet
, vtkColorLegend
, vtkHyperTreeGrid
, vtkHyperTreeGridGeometry
, vtkHyperTreeGridSource
, vtkImageSlab
, vtkImageSliceMapper
, vtkPlotBar
, vtkProjectedTexture
, vtkProp3D
, vtkScalarBarActor
, vtkStructuredNeighbor
, vtkTextActor
, vtkTextProperty
, vtkTreeHeatmapItem
- orientation
: vtkWebGLWidget
- OrientationArray
: vtkOpenGLStickMapper
- OrientationMarker
: vtkOrientationMarkerWidget
- OrientationMode
: vtkGlyph3DMapper
- OrientationPoint
: vtkPCANormalEstimation
- Orientations
: vtkLabelHierarchy
- OrientedBounds
: vtkCubeAxesActor
- OrientLoops
: vtkRuledSurfaceFilter
- OrigConnections
: vtkMPASReader
- Origin
: global
, vtkAbstractImageInterpolator
, vtkAffineRepresentation2D
, vtkAxes
, vtkCheckerboardSplatter
, vtkDataObjectToDataSetFilter
, vtkDepthImageProcessingPass
, vtkDepthSortPolyData
, vtkFastSplatter
, vtkFinitePlaneRepresentation
, vtkGeoCamera
, vtkGeoTerrain
, vtkGlobeSource
, vtkGreedyTerrainDecimation
, vtkHyperTreeGrid::vtkHyperTreeGridSuperCursor
, vtkHyperTreeGridSource
, vtkImageData
, vtkImageOrthoPlanes
, vtkImagePointIterator
, vtkImageStencilData
, vtkNetCDFCFReader::vtkDimensionInfo
, vtkPlane
, vtkPlaneSource
, vtkPointDensityFilter
, vtkPointOccupancyFilter
, vtkPolyDataSilhouette
, vtkProjectedTerrainPath
, vtkProp3D
, vtkRayCastRayInfo
, vtkSimple3DCirclesStrategy
, vtkTextureMapToPlane
, vtkTransformTextureCoords
, vtkViewport
, vtkXMLImageDataReader
, vtkXMLPImageDataReader
- OriginActor
: vtkFinitePlaneRepresentation
- OriginalBlending
: vtkOpenGLHardwareSelector
- OriginalCellIds
: vtkDataSetSurfaceFilter
- OriginalCellIdsName
: vtkDataSetSurfaceFilter
, vtkUnstructuredGridGeometryFilter
- OriginalDPI
: QVTKOpenGLNativeWidget
- OriginalIndices
: vtkExodusIIReaderPrivate::ArrayInfoType
- OriginalInput
: vtkExodusIIWriter
, vtkXdmf3Writer
- OriginalLevel
: vtkImagePlaneWidget
, vtkResliceCursorRepresentation
- OriginalMultisample
: vtkOpenGLHardwareSelector
- OriginalName
: vtkExodusIIReaderPrivate::BlockInfoType
- OriginalNames
: vtkExodusIIReaderPrivate::ArrayInfoType
, vtkExodusIIReaderVariableCheck
- OriginalPointIds
: vtkDataSetSurfaceFilter
- OriginalPointIdsName
: vtkDataSetSurfaceFilter
, vtkUnstructuredGridGeometryFilter
- OriginalTextureData
: vtkOpenVROverlay
- OriginalValue
: vtkShader::ReplacementSpec
- OriginalWindow
: vtkImagePlaneWidget
, vtkResliceCursorRepresentation
- OriginArray
: vtkDataObjectToDataSetFilter
- OriginArrayComponent
: vtkDataObjectToDataSetFilter
- OriginCallback
: vtkImageImport
- OriginComponentRange
: vtkDataObjectToDataSetFilter
- OriginCX
: vtkImageMandelbrotSource
- OriginGeometry
: vtkFinitePlaneRepresentation
- OriginHandleProperty
: vtkFinitePlaneRepresentation
- OriginLatitude
: vtkGeoCamera
- OriginLongitude
: vtkGeoCamera
- OriginMapper
: vtkFinitePlaneRepresentation
- OriginRepresentation
: vtkAxesTransformRepresentation
- OriginScale
: vtkImageChangeInformation
- OriginTranslation
: vtkImageChangeInformation
, vtkImplicitPlaneWidget
- OriginWidget
: vtkAxesTransformWidget
- OrthoAxis
: vtkCheckerboardRepresentation
- OSPMeshes
: vtkOSPRayPolyDataMapperNode
- OSPRayIsosurface
: vtkOSPRayVolumeMapperNode
- OSPRayVolume
: vtkOSPRayTetrahedraMapperNode
, vtkOSPRayVolumeMapperNode
- ostr
: vtkOStreamWrapper
- OStream
: vtkFileOutputWindow
, vtkStringOutputWindow
- OutCellCount
: vtkQuadricClustering
- OutData
: vtkAdaptiveDataSetSurfaceFilter
, vtkHyperTreeGridAlgorithm
- OutEdges
: vtkVertexAdjacencyList
- OuterRadius
: vtkCompassRepresentation
, vtkDiskSource
, vtkSectorSource
- OuterSize
: vtkRecursiveSphereDirectionEncoder
- OutFile
: vtkXMLWriter
- OutGradient
: vtkImplicitDataSet
, vtkImplicitVolume
- OutIn
: vtkBooleanTexture
- OutlierActor
: vtkParallelCoordinatesHistogramRepresentation
- OutlierData
: vtkParallelCoordinatesHistogramRepresentation
- OutlierFilter
: vtkParallelCoordinatesHistogramRepresentation
- OutlierLabel
: vtkCategoryLegend
- OutlierMapper
: vtkParallelCoordinatesHistogramRepresentation
- Outline
: vtkCursor2D
, vtkCursor3D
, vtkEarthSource
, vtkImplicitCylinderRepresentation
, vtkImplicitPlaneRepresentation
, vtkImplicitPlaneWidget
, vtkInteractorStyle
, vtkOrientationMarkerWidget
- OutlineActor
: vtkGraphMapper
, vtkImplicitCylinderRepresentation
, vtkImplicitPlaneRepresentation
, vtkImplicitPlaneWidget
, vtkInteractorStyle
, vtkOrientationMarkerWidget
, vtkRenderedGraphRepresentation
- OutlineColor
: vtkViewTheme
- OutlineCornerSource
: vtkOutlineCornerFilter
, vtkPOutlineCornerFilter
- OutlineCursorWires
: vtkBoxRepresentation
, vtkBoxWidget
- OutlineFaceWires
: vtkBoxRepresentation
, vtkBoxWidget
- OutlineGlyph
: vtkRenderedGraphRepresentation
- OutlineMapper
: vtkBoxRepresentation
, vtkBoxWidget
, vtkGraphMapper
, vtkImplicitCylinderRepresentation
, vtkImplicitPlaneRepresentation
, vtkImplicitPlaneWidget
, vtkInteractorStyle
, vtkRenderedGraphRepresentation
- OutlinePolyData
: vtkBoxRepresentation
, vtkBoxWidget
- OutlinePolygons
: vtkGeoJSONFeature
, vtkGeoJSONReader
- OutlineProperty
: vtkBoxRepresentation
, vtkBoxWidget
, vtkImplicitCylinderRepresentation
, vtkImplicitPlaneRepresentation
, vtkImplicitPlaneWidget
, vtkParallelopipedRepresentation
- OutlineSource
: vtkGenericOutlineFilter
, vtkOutlineFilter
, vtkPOutlineFilter
- OutlineTranslation
: vtkImplicitCylinderRepresentation
, vtkImplicitPlaneRepresentation
, vtkImplicitPlaneWidget
- OutNames
: vtkExodusIIWriter::VariableInfo
- OutOn
: vtkBooleanTexture
- OutOut
: vtkBooleanTexture
- outPtr
: vtkImage2DIslandPixel
- Output
: ArrayPair< T >
, RealArrayPair< TInput, TOutput >
, vtkOTFilter
, vtkParticleTracerBase
, vtkPlotHistogram2D
, vtkTrivialProducer
- OutputArray
: BaseArrayPair
- OutputArrayName
: vtkAddMembershipArray
, vtkCountFaces
, vtkCountVertices
, vtkMapArrayValues
, vtkTreeDifferenceFilter
- OutputArrayNameSuffix
: vtkTemporalArrayOperatorFilter
- OutputArrayType
: vtkMapArrayValues
- OutputAttributeData
: vtkFieldDataToAttributeDataFilter
- OutputAttributeIndices
: vtkTessellatorFilter
- OutputAttributes
: vtkTessellatorFilter
- OutputBounds
: vtkRandomHyperTreeGridSource
- OutputConnectedValue
: vtkImageSeedConnectivity
- OutputCoordinates
: vtkTemporalStreamTracer
- OutputCoordinateSystem
: vtkGeoSampleArcs
, vtkLabelPlacer
, vtkTransformCoordinateSystems
- OutputDataType
: vtkMergeFields
- OutputDataTypeIsDouble
: vtkPTSReader
- OutputDimension
: vtkTessellatorFilter
- OutputDimensionality
: vtkImageReslice
- OutputDimensions
: vtkFastSplatter
, vtkImageResize
, vtkRasterReprojectionFilter
- OutputExtent
: vtkImageReslice
- OutputExtentStart
: vtkImageChangeInformation
- OutputField
: vtkMergeDataObjectFilter
- OutputFileName
: vtkXMLHierarchicalBoxDataFileConverter
- OutputFormat
: vtkImageMapToColors
, vtkImageResliceToColors
, vtkVideoSource
- OutputGrid
: vtkStructuredImplicitConnectivity
- OutputHTG
: vtkHyperTreeGridSource
- OutputId
: vtkMultiThreshold::Set
- OutputIndex
: vtkExodusIIWriter::Block
- OutputLines
: vtkQuadricClustering
- OutputMesh
: vtkTessellatorFilter
- OutputMode
: vtkContourLoopExtraction
- OutputNeedsInitialization
: vtkVideoSource
- OutputNumberOfScalarComponents
: vtkImagePadFilter
- OutputOrigin
: vtkImageChangeInformation
, vtkImageReslice
, vtkImageStencilSource
- OutputOutlierIds
: vtkPairwiseExtractHistogram2D
- OutputPD
: vtkGreedyTerrainDecimation
- OutputPedigreeIds
: vtkDelimitedTextReader
, vtkTecplotTableReader
- OutputPipe
: vtkWin32ProcessOutputWindow
- OutputPointData
: vtkTemporalStreamTracer
- OutputPoints
: vtkTessellatorFilter
- OutputPointsPrecision
: vtkAdaptiveSubdivisionFilter
, vtkAppendFilter
, vtkAppendPoints
, vtkAppendPolyData
, vtkArcSource
, vtkBoundedPointSource
, vtkCleanPolyData
, vtkClipDataSet
, vtkClipPolyData
, vtkConeSource
, vtkConnectivityFilter
, vtkContour3DLinearGrid
, vtkContourFilter
, vtkContourGrid
, vtkCubeSource
, vtkCutter
, vtkCylinderSource
, vtkDecimatePolylineFilter
, vtkDecimatePro
, vtkDelaunay3D
, vtkDepthImageToPointCloud
, vtkDiskSource
, vtkEllipseArcSource
, vtkEllipticalButtonSource
, vtkFeatureEdges
, vtkFrustumSource
, vtkGeometryFilter
, vtkGlyph3D
, vtkGlyphSource2D
, vtkGridSynchronizedTemplates3D
, vtkHedgeHog
, vtkImageToPoints
, vtkLinearToQuadraticCellsFilter
, vtkLineSource
, vtkMaskPoints
, vtkOutlineSource
, vtkParametricFunctionSource
, vtkPlaneSource
, vtkPlatonicSolidSource
, vtkPointSource
, vtkPolyDataConnectivityFilter
, vtkPolyDataNormals
, vtkProcrustesAlignmentFilter
, vtkRectangularButtonSource
, vtkRegularPolygonSource
, vtkSmoothPolyDataFilter
, vtkSphereSource
, vtkStaticCleanPolyData
, vtkSuperquadricSource
, vtkSynchronizedTemplatesCutter3D
, vtkTableBasedClipDataSet
, vtkTessellatedBoxSource
, vtkTextSource
, vtkTexturedSphereSource
, vtkThreadedSynchronizedTemplatesCutter3D
, vtkThreshold
, vtkThresholdPoints
, vtkTransformFilter
, vtkTransformPolyDataFilter
, vtkTubeFilter
, vtkVolumeOfRevolutionFilter
- OutputPrecision
: vtkCellTypeSource
- OutputProjection
: vtkRasterReprojectionFilter
- OutputScalarType
: vtkCheckerboardSplatter
, vtkImageBSplineCoefficients
, vtkImageCast
, vtkImageEllipsoidSource
, vtkImageReslice
, vtkImageShiftScale
, vtkImageSlab
, vtkImageStencilToImage
, vtkImageThreshold
, vtkImplicitModeller
, vtkSampleFunction
, vtkUnsignedDistance
- OutputSetLock
: vtkGeoSource
- OutputsInitialized
: vtkExtractVectorComponents
- OutputSpacing
: vtkImageChangeInformation
, vtkImageResize
, vtkImageReslice
, vtkImageStencilSource
- OutputStream
: vtkFacetWriter
, vtkInteractorEventRecorder
, vtkJavaScriptDataWriter
, vtkMNIObjectWriter
- OutputString
: vtkArrayDataWriter
, vtkArrayWriter
, vtkDataWriter
, vtkDelimitedTextWriter
, vtkGeoJSONWriter
, vtkX3DExporter
, vtkX3DExporterWriter
, vtkXMLWriter
- OutputStringLength
: vtkDataWriter
, vtkGeoJSONWriter
, vtkX3DExporter
, vtkX3DExporterWriter
- OutputStyle
: vtkImageToPolyDataFilter
- OutputTimeValues
: vtkTemporalStreamTracer
- OutputTraversedBounds
: vtkLabelPlacementMapper
, vtkLabelPlacer
- OutputTriangleArray
: vtkQuadricClustering
- OutputTriangles
: vtkImageDataGeometryFilter
- OutputTrueValue
: vtkImageLogic
- OutputType
: vtkCollectGraph
, vtkConvertSelection
, vtkNetCDFCFReader
- OutputUnconnectedValue
: vtkImageSeedConnectivity
- OutputUtil
: vtkTemporalFractal
- OutputVariableName
: vtkDSPFilterDefinition
- OutputVector
: vtkImageIterateFilter
- OutputWholeExtent
: vtkExtractStructuredGridHelper
, vtkImageClip
, vtkImagePadFilter
, vtkImageStencilSource
, vtkRectilinearGridClip
, vtkStructuredGridClip
, vtkVideoSource
- OutputWindow
: vtkMultiProcessController
- OutRange
: vtkTemporalShiftScale
- OutsideBounds
: vtkImplicitCylinderRepresentation
, vtkImplicitPlaneRepresentation
, vtkImplicitPlaneWidget
- OutsideValue
: vtkImageStencilToImage
- OutStringStream
: vtkXMLWriter
- OutTextureCoord
: vtkThresholdTextureCoords
- OutValue
: vtkAbstractImageInterpolator
, vtkImageEllipsoidSource
, vtkImageThreshold
, vtkImageThresholdConnectivity
, vtkImplicitDataSet
, vtkImplicitVolume
- outVector_of_vtkPolyData
: vtkOBJPolyDataProcessor
- OverideColorUsed
: vtkCompositeMapperHelper2
- Overlap
: vtkGeoAlignedImageSource
- OverlapExtent
: vtkStructuredNeighbor
- OverlayHandle
: vtkOpenVROverlay
- OverlayPass
: vtkOptiXPass
, vtkOSPRayPass
, vtkRenderStepsPass
- OverlayTexture
: vtkOpenVROverlay
- OverlayThumbnailHandle
: vtkOpenVROverlay
- override
: vtkArrayIteratorTemplate< T >
, vtkDenseArray< T >
, vtkOpenGLGL2PSHelper
, vtkUnstructuredGridBase
- OverrideArray
: vtkObjectFactory
- OverrideArrayLength
: vtkObjectFactory
- OverrideClassNames
: vtkObjectFactory
- OverridesColor
: vtkCompositeMapperHelperData
- OverrideWithName
: vtkObjectFactory::OverrideInformation
- OwnApp
: vtkXRenderWindowInteractor
- OwnContext
: vtkOpenGLRenderWindow
- OwnDisplay
: vtkOSOpenGLRenderWindow
, vtkXOpenGLRenderWindow
- Owner
: vtkQtConnection
- OwnHeader
: vtkNIFTIImageWriter
- OwnOpaqueRGBATexture
: vtkDepthPeelingPass
- OwnOpaqueZTexture
: vtkDepthPeelingPass
- OwnsFunctor
: vtkDataArrayDispatcher< DefaultFunctorType, ReturnType >
- OwnTop
: vtkXRenderWindowInteractor
- OwnWindow
: vtkEGLRenderWindow
, vtkImageDataLIC2D
, vtkOSOpenGLRenderWindow
, vtkStructuredGridLIC2D
, vtkWin32OpenGLRenderWindow
, vtkXOpenGLRenderWindow