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• ObjectLightness : SoAutoThresholdingProcessing , SoTopHatProcessing , SoHExtremaWatershedProcessing
• OffsetMode : SoBinaryCorrelationProcessing2d , SoGrayscaleCorrelationProcessing2d
• OpenMode : SoRasterImageRW
• OperandRGBA : SoTextureCombiner
• Operation : SoBoolOperation
• OperationMode : SoIterativeMorphoLutProcessing2d , SoIterativeMorphoLutProcessing3d
• Orientation : PoCurveFilling , SoVectorizeAction , SoTextOrientationElement , PoBar , SoTextProperty , SliceScaleBar
• Origin : SoArray
• OutMapType : SoSupervisedTextureClassificationProcessing3d , SoSupervisedTextureClassificationProcessing2d
• OutputFormat : SoOffscreenRenderArea
• OutputMode : SoMarkerBasedWatershedProcessing
• OutputSelection : SoEigenDecompositionProcessing3d , SoTensorVotingProcessing2d , SoEigenDecompositionProcessing2d
• OutputType : SoRescaleIntensityProcessing , SoGaussianBlurFilterProcessing
• OverMethod : SoVolumeData