Here is a list of all enum values with links to the classes they belong to:

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- OBJECT_COORDS : osgText::TextBase
- OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT : osgText::TextBase
- OBJECT_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY : osgSim::OverlayNode
- OBJECT_LINEAR : osg::TexGen
- OFF : osg::Material, osg::StateAttribute, osgPresentation::SlideShowConstructor::ImageData
- ON : osg::StateAttribute, osgPresentation::SlideShowConstructor::ImageData
- ON_DEMAND : osgViewer::ViewerBase
- ONCE : osgAnimation::Animation
- ONCE_PER_ATTRIBUTE : osg::State
- ONCE_PER_FRAME : osg::State
- ONE : osg::BlendFunc
- ONE_MINUS_CONSTANT_ALPHA : osg::BlendFunc
- ONE_MINUS_CONSTANT_COLOR : osg::BlendFunc
- ONE_MINUS_DST_ALPHA : osg::BlendFunc
- ONE_MINUS_DST_COLOR : osg::BlendFunc
- ONE_MINUS_SRC_ALPHA : osg::BlendFunc, osg::TexEnvCombine
- ONE_MINUS_SRC_COLOR : osg::BlendFunc, osg::TexEnvCombine
- ONLY : osgDB::AuthenticationDetails
- OPAQUE_BIN : osg::StateSet
- OPEN_BRACKET : osgDB::Field
- OPTIMIZE_TEXTURE_SETTINGS : osgUtil::Optimizer
- OR : osg::LogicOp
- OR_INVERTED : osg::LogicOp
- OR_REVERSE : osg::LogicOp
- ORTHOGRAPHIC_SHADOW_MAP : osgShadow::ShadowSettings
- OSGNV_PARAMETER_BLOCK : osg::StateAttribute
- OSGNVCG_PROGRAM : osg::StateAttribute
- OSGNVEXT_REGISTER_COMBINERS : osg::StateAttribute
- OSGNVEXT_TEXTURE_SHADER : osg::StateAttribute
- OSGNVEXT_VERTEX_PROGRAM : osg::StateAttribute
- OSGNVPARSE_PROGRAM_PARSER : osg::StateAttribute
- OSGNVSLANG_PROGRAM : osg::StateAttribute
- OUTLINE : osgText::Text
- OVERALL : osgText::Text
- OVERRIDE : osg::StateAttribute
- OVERRIDE_PROTECTED_RENDERBIN_DETAILS : osg::StateSet
- OVERRIDE_RENDERBIN_DETAILS : osg::StateSet
- OVERWRITE : osgViewer::ScreenCaptureHandler::WriteToFile