FlatRedBall
  • 🖥️Downloading FlatRedBall
  • 🏗️Building FlatRedBall From Source
    • Linking Games to FlatRedBall Engine Source
    • Linking FNA
  • ❓Need Help?
  • ✨FlatRedBall Features
  • 🎓Tutorials
    • Introduction To FlatRedBall
    • Quick Start Guide
    • Beefball - A Full FlatRedBall Tutorial Project
      • Creating a FlatRedBall Project
      • Creating an Entity
      • Creating a Screen
      • Controlling an Entity
      • Creating the Screen Collision
      • Advanced PlayerBall Controls
      • Creating the Puck Entity
      • Adding Multiple Players
      • Scoring and Restarting Rounds
      • Scoring Hud
      • Scoring Hud Logic
      • Adding Dashing
    • Platformer Tutorials
      • Platformer Basics
        • Creating an Entity
        • Controlling a Platformer Entity
        • Movement Values
        • Double Jump
      • Checkpoint and Level End
      • Climbing Ladders
      • Doors
      • GroundCollidedAgainst and Movement Values
      • Moving Platforms
      • Multiple Players
      • NPC Dialog
      • Breaking Blocks
        • New Project Setup
        • Creating Level1 Map
        • Creating the Block Entity
        • Block Removal
      • Dealing Damage
        • New Project Setup
        • Enemy Entity
        • Shooting Bullets
        • Damaging the Enemy
      • Enemy Movement
        • New Project Setup
        • Enemy Entity
        • Enemy Input Logic
        • Detecting Platform Edges
      • Ground Type and Water Movement
        • New Project Setup
        • Creating Level1 Map
        • Adding Ice and Water
        • Platformer Movement Values
      • Animation and Platformer Values
        • New Project Setup
        • Creating AnimationLayers
        • Modifying Platformer Values
      • Wall Sliding and Jumping
    • Damage Dealing
      • Setup
      • Team Index
      • Damage Events
      • IDamageArea Removal
      • Melee Damage
    • Entity Variants Using Inheritance
    • FlatRedBall.Forms
      • Getting Started with FlatRedBall.Forms
        • Setup
        • Working with Common Controls
        • Forms vs Gum in Code
      • Forms and Xbox360GamePad
      • Data Binding (BindingContext)
        • BindingContext Property
        • Binding FlatRedBall.Forms
        • Parent and Children Binding using BindingContext
        • ListBox Templates
      • Styling Forms
      • Defining New Forms Types
        • Adding New Types to FlatRedBall.Forms Library
      • Accessing Forms Events in Gum Runtimes
    • Top Down Games
      • Top Down Basics
        • Setup
        • Input Device
        • CurrentMovement
      • Enemy Movement
        • Enemy Pathfinding
        • Direct Enemy Control
      • GroundVelocity
      • Animation
      • Sorting
    • Post Processing
    • Rock Blaster - A Full FlatRedBall Tutorial Project
      • Introduction
      • Setup
      • Game Skeleton
      • Player Entity
      • Player Behavior
      • Rock Entity
      • Collision
      • Rock States
      • HUD
      • Multiple Players
      • Health
      • Health Part 2
      • Destroying Entities
      • Cleaning Up
    • Code-Only Projects (No Editor)
      • Creating a FlatRedBall Project
      • Adding a Circle
      • Loading Textures and Using Sprites
    • Code Tutorials
      • 3D Camera Setup
      • Adding FlatRedBall to a MonoGame/FNA Project
      • Adding WPF to an Existing Game
      • async and await
      • CLR Profiler
      • Collision Jitter
      • Culling
      • Customizing Cursor Visuals
        • Windows Desktop
        • windows-rt
      • Depth Buffer Z Fighting
      • Dictionaries and Enum Keys
      • FlatRedBall XNA in Windows Form
      • Improving Performance
        • CustomActivity Performance
        • Identifying Screen Creation Performance Issues
        • Rendering Performance
        • Manually Updated Objects
          • Introduction
          • Measuring Automatic Updates
          • Measuring Sprite Automatic Updates
          • Manual Particle Systems
      • Object Sorting
      • Pix
      • Rendering Sprites with Shaders
      • Tile-Based Movement
      • Velocity
    • Distribution
      • App Icon
      • Emptying bin Folder Using Probing Path
      • itch.io
      • Release Build
      • Steam
    • FlatRedBall and Velcro Physics
      • Using Velcro Physics with the FlatRedBall Editor
      • Code-Only Velcro Projects
    • FlatRedBall Editor Plugins
      • Introduction to FlatRedBall Plugins
      • Creating a Plugin Project
      • Creating a Plugin Class
      • Adding UI to FlatRedBall
      • Using MVVM
      • Creating a NamedObjectSave-Editing Plugin
      • Adding File Format Support
      • Adding Code Files to a Game Project
      • Errors
      • Exporting a Plugin
    • Additional FlatRedBall Editor Tutorials
      • How to Create a First Person Camera
      • How to Play Sounds
      • How to Share Reference Data Between Screens and Entities
    • Math Tutorials
      • Circle Collision
      • Determining required magnitude for trajectory
      • Introduction to Collision
      • Power of Two
      • Rectangle Collision
      • rotation
      • statistics
      • trigonometry
      • vector
      • matrix
      • interpolation
    • Overworld Tutorials
      • Spinning Mode 7
        • New Project Setup
        • Adding Camera Code
        • Fading In and Out
  • 🎞️Videos
  • 📐FlatRedBall Editor
    • Display Settings
    • Entities
      • BaseEntity
      • Constructor
      • ConvertToManuallyUpdated
      • CreatedByOtherEntities
      • CustomActivity
      • CustomDestroy
      • CustomInitialize
      • Destroying Entities
      • Entity Performance
      • Export Entity
      • Implements IClickable
      • Implements ICollidable
      • Implements IDamageArea
      • Implements IDrawableBatch
      • Implements IGumCollidable
      • Implements IVisible
      • Implements IWindow
        • SlideOnClick
      • Import Entity
      • Inheriting from FlatRedBall Types
      • LayerProvidedByContainer
      • MoveToLayer
      • PooledByFactory
      • Top Down Movement
        • TopDownSpeedMultiplier
      • Use Global Content
    • Events
      • ResolutionRrOrientationChanged
    • Factories
      • CreateNew
      • EntitySpawned
      • Initialize
      • SortAxis
    • Files
      • File Types
        • Animation Chain List (.achx)
        • Comma Separated Values (.csv)
          • Combining .csvs With Entities
          • CreatesDictionary
          • Cross Referencing CSVs
          • Instantiating Custom Types
          • OrderedList
          • SetCreatedClass
            • generate-data-class
          • uniformrowtype
        • Effect (.fx, .fxb)
        • Font (.fnt)
        • JSON (.json)
        • Model (.fbx)
        • MP3
        • Node Network (.nntx)
        • OpenDocument Spreadsheet (.ods)
        • ShapeCollections (.shcx)
        • SplineList (.splx)
        • Texture2D (.png)
        • Wave (.wav)
      • Accessing Files in Code
      • Adding File Objects to Managers
      • Destroy on Unload
      • File Build Tool
      • Folders
      • Global Content Files
      • IsDatabaseForLocalizing
      • IsManuallyUpdated
      • IncludeDirectoryRelativeToContainer
      • LoadedAtRuntime
      • LoadedOnlyWhenReferenced
      • Name
      • Platform Inclusions
      • Project Specific Files
      • RuntimeType
      • SourceFile
      • UseContentPipeline
      • Wildcard Files
    • FileVersion (.gluj)
    • Generated Code
    • Global Content Files
      • LoadAsynchronously
      • Reload
      • Setting Files At Runtime
    • Live Edit
      • Render Targets
    • Menu
      • Content
        • Additional Content
          • Using Runtime Types as Objects
          • creating-runtime-objects
          • runtime-object-charateristics
          • simple-line-of-text-tutorial
        • Introduction
        • pipeline-settings
      • File
        • New Project
      • Edit
        • Find File References
      • Plugins
        • Install Plugin
        • Manage Plugins
      • Project
        • View Projects
      • Settings
        • Camera Settings
        • File Associations
        • File Build Tools
        • Performance Settings
      • Update
        • Introduction
        • glue-reference-menu-frbdk
        • glue-reference-menu-libraries
    • Multi-Platform
      • Synced Projects
      • Changing Main Project Type
      • Android
        • Distribution
        • Setup
      • iOS
        • Certificates and Profiles
        • Copying Projects to Mac
        • Using Xamarin Build Host
      • Switch (Nintendo)
      • Web
    • Objects
      • Object Types
        • AxisAlignedRectangle
        • Camera
        • CameraControllingEntity
        • Circle
        • CollisionRelationship
        • Layer
          • DestinationRectangle
          • Is2D
        • Polygon
        • PositionedObjectList
        • RenderTarget2D
        • ShapeCollection
        • SoundEffectInstance
        • Sprite
        • Text
        • TileNodeNetwork
      • AddToManagers
      • AttachToCamera
      • AttachToContainer
      • CallActivity
      • Collidable Objects
      • EntireFile
      • ExposedInDerived
      • HasPublicProperty
      • IgnoresPausing
      • IncludeInIClickable
      • IncludeInICollidable
      • IsContainer
      • LayerOn
      • Map
      • SetByDerived
      • SourceFile
      • SourceType
    • Plugins
      • glue-gluevault-component-pages-rendertargetrenderer
      • glue-gluevault-component-pages-simple-command-console
      • glue-gluevault-component-pages-squid-gui-integration
      • kalldrexx-interactive-debugging-console
    • Profiling
    • Screens
      • AsyncLoadingState
      • BaseScreen
      • Constructor
      • Creating a New Screen
      • CustomDestroy
      • CustomInitialize
      • DefaultLayer
      • GameScreen
      • IsActivityFinished
      • IsLoadingScreen
      • LoadStaticContent
      • MoveToScreen
      • PauseAdjustedCurrentTime
      • Set as StartUp Screen
      • UnloadsContentManagerWhenDestroyed
    • States
      • InterpolateToState
      • InterpolateToState vs InterpolateBetween
      • State Categories
      • State Classes
      • States and Inheritance
      • Tunneling Category Variables
    • Variables
      • CreatesEvent
      • HasAccompanyingVelocityProperty
      • IsShared
      • Proper Variable Naming
      • SetByDerived
      • Type
      • Variable Order
    • Visual Studio Project (.csproj)
  • 🏃Animation Editor
    • Frame Time
    • Animation Shapes and Collision
  • Tiled
    • Tiled Basics
      • Introduction
      • Creating a GameScreen
      • Adding Collision
      • Colliding Entities Against TileShapeCollections
      • Working with Multiple Levels
      • Creating Entities from Tiles
      • Creating Entities from Object Layers
      • Accessing Tiled Properties
      • Working with Tiled Shapes
    • Tiled Files in Entities
    • TileEntityInstantiator
    • Using TiledObjects.Generated.xml
    • LayeredTileMap
      • Collisions
      • Destroy
      • FromTiledMapSave
      • Z
    • MapDrawableBatch
      • AddTile
      • CoordinateAdjustment
      • GetBottomLeftWorldCoordinateForOrderedTile
      • MergeOntoThis
      • NamedTileOrderedIndexes
      • PaintTile
      • PaintTileTextureCoordinates
      • ParallaxX
      • Paste
      • Properties
      • RemoveQuads
      • RenderingScale
      • SortAxis
    • TiledMapSave
    • TileShapeCollection
      • AddCollisionAtWorld
      • AddCollisionFrom
      • AddCollisionFromTilesWithProperty
      • AddMergedCollisionFromLayer
      • AddMergedCollisionFromTilesWithProperty
      • AdjustRepositionDirectionsOnAddAndRemove
      • CollideAgainst
      • CollideAgainstClosest
      • GetRectangleAtPosition
      • InsertCollidables
      • LastCollisionAxisAlignedRectangles
      • Rectangles
      • RemoveFromManagers
      • RemoveSurroundedCollision
  • 🟩Gum
    • Tutorials
      • Introduction and Setup
      • Screens in Gum
      • Gum Objects in Code
      • Events on Gum Objects
      • Events on Gum Objects Part 2
      • Exposed Variables
      • States
      • Adding Code to Gum Objects
    • Accessing Gum Screens in Code
    • Adding Components to Layers
    • Adding Gum Screens to FlatRedBall
    • Animations in Code
    • Components in FlatRedBall Entities
    • Converting Gum Coordinates
    • Creating Components in Code
    • GraphicalUiElement as IWindow
    • Gum Resolution
    • Gum Properties Tab
    • Gum Animations
      • How to Play Gum Screen Animations
      • Named Events
      • Setting Gum Animationchain Achx in Code
  • 🦴Spine
    • Setup
    • Atlas
    • Changing Spine Textures at Runtime
    • SpineDrawableBatch
      • Event
      • PlayAnimation
      • SetCollision
      • Skeleton
  • ⏸️Aseprite
    • AnimationChainList
  • 🏫API Documentation
    • FlatRedBall Engine
      • AI
        • LineOfSight
          • VisibilityGrid
        • Pathfinding
          • PositionedNode
          • Link
            • Cost
            • NodeLinkingTo
          • NodeNetwork
            • GetPath
            • UpdateShapes
            • Visible
          • TileNodeNetwork
            • AddAndLinkTiledNode
            • AddAndLinkTiledNodeWorld
            • OccupyTileWorld
            • SetCosts
      • Audio
        • AudioManager
          • AreSoundEffectsEnabled
          • CurrentlyPlayingSong
          • MasterSongVolume
          • MasterSoundVolume
          • Play
          • PlaySong
          • PlaySongs
          • StopSong
        • PositionedSound
        • Sound
      • Camera
        • AbsoluteRightXEdge
        • AbsoluteRightXEdgeAt
        • AddLayer
        • AddSpriteToBillboard
        • AspectRatio
        • AttachTo
        • BackgroundColor
        • CameraCullMode
        • ClearMinimumsAndMaximums
        • ClearsDepthBuffer
        • DestinationRectangle
        • DrawsShapes
        • DrawsToScreen
        • DrawsWorld
        • FarClipPlane
        • FieldOfView
        • FixAspectRatioYConstant
        • ForceUpdateDependencies
        • GetViewport
        • IsSpriteInView
        • KeepSpriteInScreen
        • Layer
        • Layers
        • Main
        • MaximumX
        • Orthogonal
        • OrthogonalHeight
        • OrthogonalWidth
        • PixelsPerUnitAt
        • Position
        • PositionRandomlyInView
        • RelativeXEdgeAt
        • RemoveLayer
        • RotationMatrix
        • SetBordersAtZ
        • SetLookAtRotationMatrix
        • SetSplitScreenViewport
        • UpdateViewProjectionMatrix
        • UpVector
        • UsePixelCoordinates
        • UsePixelCoordinates3D
        • View
      • Content
        • ContentLoadBatch
        • AnimationChain
          • AnimationChainListSave
        • ContentManager
          • AddUnloadMethod
          • FileAliases
          • IsAssetLoadedByName
          • Load
          • LoadFromGlobalIfExists
          • Multiple Content Managers
        • Math
          • Geometry
            • ShapeCollectionSave
        • Polygon
          • PolygonSave
        • Scene
          • CameraSave
          • SceneSave
        • SpriteEditorScene
          • Camera
      • Debugging
        • Debugger
          • CommandLineWrite
          • GetFullPerformanceInformation
          • TextBlue
          • WriteAutomaticallyUpdatedObjectInformation
      • Entities
        • CameraControllingEntity
        • IDamageable
        • IDamageArea
      • FlatRedBallServices
        • AddDisposable
        • AddManager
        • CornerGrabbingResize
        • Draw
        • ForceClientSizeUpdates
        • Game
        • GetManagerInformation
        • GlobalContentManager
        • GraphicsOptions
        • Initialize
        • IsLoaded
        • Load
        • Owner
        • Random
        • RenderAll
        • Unload
        • Update
        • WindowHandle
      • Graphics
        • Animation
          • AnimationChain
            • Clone
            • FrameToFrame
            • TotalLength
          • AnimationChainList
          • AnimationController
          • AnimationFrame
            • RelativeX
            • ShapeCollectionSave
            • Texture
          • IAnimationChainAnimatable
            • Animate
            • Animation and Timing
            • AnimationChains
            • AnimationSpeed
            • CurrentChainName
            • CurrentFrameIndex
            • JustChangedFrame
            • JustCycled
            • UseAnimationRelativePosition
        • BitmapFont
          • BMFC File
          • BitmapCharacterInfo
          • FNT File
          • Glyphs
          • LineHeightInPixels
          • RenderToTexture2D
        • BlendOperation
        • ColorOperation
          • Add
          • Color
          • ColorTextureAlpha
          • InterpolateColor
          • Modulate
          • Texture
        • GraphicsOptions
          • Filtering
          • IsFullScreen
          • ResolutionHeight
          • SetFullScreen
          • SetResolution
          • SizeOrOrientationChanged
          • TextureFilter
          • TextureLoadingColorKey
          • UseMultisampling
        • IColorable
          • Alpha
          • BlendOperation
          • Blue
          • ColorOperation
        • IDrawableBatch
          • Z
          • RenderState
        • IVisible
          • IgnoresParentVisibility
        • Layer
          • Layer Membership Details
          • LayerCameraSettings
          • Remove
          • RenderTarget
          • SortType
          • Sprites
          • UsePixelCoordinates
        • LayerCameraSettings
          • OrthogonalWidth
          • TopDestination
        • Particle
          • EmissionSettings
            • Drag
            • PixelSize
            • ScaleX
          • Emitter
        • PostProcessing
          • SwapChain
        • RenderBreak
        • Renderer
          • Draw
          • LastFrameRenderBreakList
          • RenderBreaksAllocatedThisFrame
        • Text
          • AdjustPositionForPixelPerfectDrawing
          • ColorOperation
          • DisplayText
          • GetWidth
          • Font
          • HorizontalAlignment
          • InsertNewLines
          • MaxWidth
          • MaxWidthBehavior
          • NewLineDistance
          • NumberOfLines
          • ScaleX
          • SetColor
          • SetPixelPerfectScale
          • VerticalAlignment
          • Width
        • TextManager
          • AddManuallyUpdated
          • AddText
          • AddToLayer
          • FilterTexts
          • RemoveText
        • Texture
          • RenderTargetSprite
          • ImageData
            • ApplyColorOperation
            • Fill
            • FromTexture2D
      • Gui
        • Cursor
          • Camera
          • ClickNoSlideThreshold
          • CustomUpdate
          • GetRay
          • IngnoreInputThisFrame
          • IsInWindow
          • IsOn
          • IsOn3d
          • PrimaryClick
          • PrimaryClickNoSlide
          • PrimaryPushTime
          • ScreenX
          • SecondaryClick
          • SetControllingGamepad
          • SetJoystickControl
          • TransformationMatrix
          • WindowOver
          • WidowPushed
          • WorldPosition
          • WorldX
          • WorldXAt
          • WorldYAt
          • XForUi
        • GuiManager
          • AddDominantWindow
          • BringsClickedWindowsToFront
          • BringToFront
          • GamepadsForUiControl
          • MakeRegularWindow
          • RemoveWindow
          • SortZAndLayerBased
          • Windows
        • IClickable
        • IInputReceiver
          • IWindow
            • CallClick
            • Enabled
          • ReceiveInput
      • Input
        • AnalogButton
        • AnalogStick
          • IsMaxPositionNormalized
        • DelegateBased1DInput
        • DelegateBased2DInput
        • DelegateBasedPressableInput
        • I1DInput
        • I2DInput
        • IMouseOver
        • InputDeviceBase
        • InputManager
          • ClearAllInput
          • InputReceiver
        • IPressableInput
        • Keyboard
          • Clear
          • ControlPositionedObject
          • Get2DInput
          • GetKey
          • GetStringTyped
          • IgnoreKeyForOneFrame
          • KeyDown
          • KeyPushed
        • Mouse
          • GrabbedPositionedObject
          • IsOn3D
          • ModifyMouseState
          • Restricting Mouse to Screen Bounds
          • SetScreenPosition
        • TouchScreen
          • LastFrameGestures
          • ReadsGestures
        • Windows
          • WindowsInputEventManager
        • Xbox360GamePad
          • ButtonDown
          • ButtonMap
          • ButtonPosition vs Button
          • ButtonPushed
          • ControlPositionedObject
          • CreateDefaultButtonMap
          • Deadzone
          • DeadzoneType
          • FakeIsConnected
          • GamepadLayout
          • IgnoreButtonForOneFrame
      • Instructions
        • DelegateInstruction
        • IInstructable
          • Call
          • Cnstructions
          • Set
        • Instruction
        • InstructionList
          • ExecuteAndRemoveOrCyclePassedInstructions
        • InstructionManager
          • Add
          • AddSafe
          • Instructions
          • MoveThrough
          • MoveTo
          • MoveToAccurate
          • ObjectsIgnoringPausing
          • PauseEngine
          • Pulse
          • RotateToAccurate
        • Reflection
          • LateBinder
          • PropertyCollection
        • MethodInstruction
        • StaticMethodInstruction
      • IO
        • Csv
          • CsvHeader
          • CsvFilemanager
            • Cells with Multiple Lines
            • Color
            • CsvDeserializelist
            • Rows with Lists
          • RuntimeCsvRepresentation
            • FromList
            • GenerateCsvString
        • FileManager
          • BinarySerialize
          • CloneObject
          • FromFileText
          • GetAllFilesInDirectory
          • GetUserFolder
          • InitializeUserFolder
          • RelativeDirectory
          • SaveEmbeddedResource
          • SaveText
          • Standardize
          • UserApplicationDataForThisApplication
          • XmlDeserialize
          • XmlSerialize
      • Localization
        • LocalizationManager
      • Managers
        • IManager
      • Math
        • IAttachableRemovable
        • AttachableList
          • FindByName
          • MakeOneWay
        • Collision
          • CollisionManager
            • Relationships
            • Update
        • Geometry
          • AxisAlignedCube
            • CollideAgainstBounce
          • AxisAlignedRectangle
            • Axis Alignment And Rotation
            • CollideAgainstMoveSoft
            • Color
            • GetRandomPositionInThis
            • KeepThisInsideOf
            • LastMoveCollisionReposition
            • Left
            • RepositionDirections
          • Capsule2D
          • Circle
            • CollideAgainst
            • CollideAgainstBounce
            • CollideAgainstMove
            • IsPointInside
            • LastCollisionTangent
            • LastMoveCollisionReposition
            • ProjectParentVelocityOnLastMoveCollisionTangent
            • Visible
            • Z
          • Colliding a List of Shapes Against Itself
          • FloatRectangle
          • ICollidable
          • IScalable
            • Scale
          • Line
            • Color
            • LastCollisionPoint
            • RelativePoint1
            • SetFromAbsoluteEndpoints
          • Point
          • Polygon
            • AbsolutePointPosition
            • Clone
            • CollideAgainstBounce
            • CollideAgainstMove and Attachments
            • CollideAgainstMove
            • Color
            • CreateEquilateral
            • CreateRectangle
            • ForceUpdateDependencies
            • IsPointInside
            • LastMoveCollisionReposition
            • OptimizeRadius
            • Points
            • Position
            • ProjectParentVelocityOnLastMoveCollisionTangent
            • ScaleBy
            • Thin Polygon Problem
            • VectorFrom
            • Visible
            • Z
          • Segment
            • ClosestPointTo
          • Shape
          • ShapeCollection
            • AttachTo
            • AxisAlignedRectangles
            • CollideAgainst
            • CollideAgainstBounceWithoutSnag
            • CollideAgainstMove
            • CollideAgainstMoveWithoutSnag
            • LastCollisionAxisAlignedRectangles
            • SortAscending
            • Visible
          • ShapeManager
            • AddToLayer
            • Remove
            • ShapeDrawingOrder
          • ShapeMerger
          • Shapes and 2D Collision
          • Sphere
        • IAttachable
          • Attachment Updates in the Engine
          • Detach
          • ParentRotationChangesPosition
          • ParentRotationChangesRotation
          • TopParent
        • IRotatable
          • RotationMatrix
        • MathFunctions
          • AbsoluteToWindow
          • AngleToAngle
          • AngleToVector
          • GetPointInCircle
          • GetPositionAfterTime
          • RegulatAngle
          • RotatePointAroundPoint
          • RoundFloat
          • RoundToInt
          • WidowToAbsolute
        • Paths
          • Path
        • PositionedObjectList
          • Add
          • AttachTo
          • Clear
          • GetFirstAfter
          • GetFirstAfterPosition
          • SortXInsertionAscending
        • Splines
          • Spline
            • GetPositionAtLengthAlongSpline
      • Performance
        • Measurement
          • Section
            • GetAndStartContextAndTime
            • Save
            • ToStringVerbose
      • PositionedObject
        • Acceleration
        • AttachTo
        • Children
        • Clone
        • Drag
        • ForceUpdatedependencies
        • ForceUpdatedependenciesDeep
        • Initialize
        • KeepTrackOfReal
        • LastPosition
        • Mirrored properties
        • ParentRotationChangesPosition
        • ParentRotationChangesRotation
        • Position
        • RelativePosition
        • RelativeRotationZ
        • RelativeVelocity
        • RemoveSelfFromListsBelongingTo
        • RotationZ
        • SetRelativeFromAbsolute
        • TimedActivity
        • TopParent
        • UpdateDependencies
        • Velocity
        • Z
      • Screens
        • Screen
          • ContentManagerName
          • CustomDestroy
          • IsActivityFinished
          • MoveToScreen
          • PauseThisScreen
        • ScreenManager
          • Activity
          • CurrentScreen
          • Start
      • Sprite
        • Alpha
        • AnimateSelf
        • AnimationChains
        • AnimationSpeed
        • Bottom
        • BottomTextureCoordinate
        • Changing a Sprite's Origin
        • ColorOperation
        • CurrentChainName
        • CurrentFrameIndex
        • IgnoreAnimationChainTextureFlip
        • Inheriting from the Sprite Class
        • JustCycled
        • LeftTextureCoordinate
        • PixelSize
        • Position
        • RightTextureCoordinate
        • SetAnimationChain
        • SetScaleXRatioToY
        • Sorting and Overlapping
        • Sprite vs Texture2d
        • Texture Coordinates
        • Texture
        • TextureAddressMode
        • TextureCoordinate
        • TextureFilter
        • TextureScale
        • TimeIntoAnimation
        • TopTextureCoordinate
        • UseAnimationRelativePosition
        • Vertices
        • VerticesForDrawing
        • Visible
      • SpriteList
      • SpriteManager
        • AddDrawableBatch
        • AddManagedInvisibleSprite
        • AddManualSprite
        • AddParticleSprite
        • AddPositionedObject
        • AddSprite
        • AddToLayer
        • AddZBufferedDrawableBatch
        • AddZBufferedSprite
        • AutomaticallyUpdatedSprites
        • Camera
        • ConvertToAutomaticallyUpdated
        • ConvertToManagedInvisible
        • ConvertToManuallyUpdated
        • ConvertToZBufferedSprite
        • DrawableBatches
        • ManagedPositionedObjects
        • ManualUpdate
        • MaxParticleCount
        • MoveToBack
        • OrderedSortType
          • Z
        • OrderedSprites
        • RemoveDrawableBatch
        • RemoveLayer
        • RemovePositionedObject
        • RemoveSprite
        • RemoveSpriteOneWay
        • SortTexturesSecondary
        • SortYSpritesSecondary
        • UnderAllDrawnLayer
      • TimeManager
        • Accumulating Time
        • CurrentScreenSecondsSince
        • CurrentTime
        • Profiling
        • SecondDifference
        • SecondsSince
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On this page
  • Introduction
  • Entity Performance Concepts
  • Modifying Managed Properties
  • Generation and EntityPerformance.json
  • Select Managed Properties Tradeoff

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  1. FlatRedBall Editor
  2. Entities

Entity Performance

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Last updated 11 months ago

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Introduction

The Entity Performance tab provides options for improving the runtime performance (reducing CPU usage) for an entity. This tab is only needed for games which include a large number of entities (typically many hundreds or thousands of instances). Common types of entities which benefit from this tab are enemies and bullets.

Entity Performance Concepts

Entities and objects within entities, such as Sprites, inherit from the PositionedObject class and have default engine-level functionality for applying velocity, rotation, acceleration, drag, and attachments. Although this functionality does not take much time to perform on a single entity, some games may include thousands of entities.

In this case, the number of update calls may impact a game's framerate. If a game includes entities which are completely static (do not move after being created), then every instance of this type of entity can be converted to manually updated, which means that engine-level updates are disabled. Manually updated entities have minimal resource requirements, allowing games to instantiate tens of thousands of instances at once. Entities generate a ConvertToManuallyUpdated method which converts the entity itself and any contained objects to manually updated. This method can be used if your entity requires no every-frame management. However, these situations tend to be fairly rare.

In many cases entities require some of the automatic update logic provided by the engine, but not all. For example, a Bullet entity which moves along a straight line after being created requires velocity to be applied every frame, but does not require acceleration, drag, rotational velocity, or attachment logic. This mixed-case is very common, and this is the case where the Entity Performance tab can be used.

By default, entities are fully-managed by the engine. This means that the engine automatically updates all properties on an entity and its children. For example, the following image shows a Bullet entity and its default Entity Performance tab.

Notice that the entity itself has its own management settings, and each object within the entity (SpriteInstance and CircleInstance) also have their own management settings.

As mentioned before, these settings provide all management functionality, but also have the highest performance requirements.

Modifying Managed Properties

The Entity Performance tab provides a visual interface for selecting which properties are managed. Since every game is different, it does not provide any standard presets, but rather exposes all possible values. An entity which does not require all properties to be managed every frame can use the Select Managed Properties option.

For example, a Bullet entity which requires only velocity values can check just the XVelocity and YVelocity properties. Note that most entities do not require ZVeocity movement, so that option is left unchecked in the following image:

Generation and EntityPerformance.json

Changes to an entity's managed properties or changes to managed properties on an object inside of an entity result in code generation and storage of these properties in a EntityPerformance.json file. The EntityPerformance.json is necessary to re-generate the code whenever an entity changes, so it should be included in a game's version control repository.

The generated code for an entity includes the management of all properties selected the Select Managed Properties option is checked. For example, the following code is generated for the Bullet entity using the options shown above:

public virtual void Activity () 
{
    
    this.Position.X += this.Velocity.X * FlatRedBall.TimeManager.SecondDifference;
    this.Position.Y += this.Velocity.Y * FlatRedBall.TimeManager.SecondDifference;
    CustomActivity();
}

Of course, if custom code modifies the entity (such as by re-adding it to be managed by the engine), this generated code can result in double-management. The symptom of this is that an object may move twice as fast, animate twice as fast, or have other variables such as drag applied twice in one frame.

Select Managed Properties Tradeoff

If an entity has its Select Managed Properties option checked, then only the properties which are checked will be managed in code generation. While this can greatly reduce the amount of logic which runs every frame, it can introduce problems in your game if your entity depends on functionality which is not managed.

For example, as you develop your game you may decide that some bullet variants acceleration. If these options are unchecked then acceleration values will not be applied every frame. This creates a situation where you must remember to make modification in the Entity Performance tab.

Similarly, if your game is particulary complex it can be difficult to remember exactly which properties are needed if you decide to swithc an entity from Fully Managed to using selected managed properties. Unfortunately the only solution to this problem is to become familiar with the properties available in the list and compare them to the code you have written.

📐
Bullet entity which si fully managed
Sprite instance fully managed by the engine
Entity with Select Managed Properties checked
Entity with only XVelocity and YVelocity managed