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• Octaves : fCraft.Drawing.CloudyBrush , fCraft.PerlinNoise3D
• Offset : fCraft.CommandReader
• OldBlock : fCraft.Events.PlayerPlacingBlockEventArgs , fCraft.Events.PlayerPlacedBlockEventArgs
• OldMainWorld : fCraft.Events.MainWorldChangedEventArgs
• OldPosition : fCraft.Events.PlayerMovedEventArgs , fCraft.Events.PlayerMovingEventArgs
• OldRank : fCraft.Events.PlayerInfoRankChangingEventArgs , fCraft.Events.PlayerInfoRankChangedEventArgs
• OldUri : fCraft.Events.UriChangedEventArgs
• OldValue : fCraft.Events.ConfigKeyChangingEventArgs , fCraft.Events.ConfigKeyChangedEventArgs
• OldWorld : fCraft.Events.PlayerJoiningWorldEventArgs , fCraft.Events.PlayerJoinedWorldEventArgs
• OpCode : fCraft.Packet
• Option : Mono.Options.OptionContext
• OptionIndex : Mono.Options.OptionContext
• OptionName : Mono.Options.OptionContext , Mono.Options.OptionException
• OptionSet : Mono.Options.OptionContext
• OptionValues : Mono.Options.OptionContext
• OptionValueType : Mono.Options.Option
• Orientation : fCraft.Drawing.CopyState
• Origin : fCraft.Drawing.Fill2DDrawOperation
• OriginalText : fCraft.ConfigGUI.TextEditorPopup
• OriginCorner : fCraft.Drawing.CopyState
• OriginWorld : fCraft.Drawing.CopyState