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  2. KeyframeSequence

KeyframeSequence

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  1. apireference
  2. keyframesequence

KeyframeSequence

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This object stores all the Keyframes for an animation, determines if the animation is looped, and determines its priority against other animations.

What is a Keyframe Sequence?

The animation data Roblox uses in the playback of an animation, referenced by the Animation/AnimationId property, is constructed from a KeyframeSequence. Every animation has a KeyframeSequence associated with it. KeyframeSequences are usually created by the Roblox Animation Editor but can be created through other plugins or even manually. Once uploaded to Roblox, their Content ID is used for the Animation/AnimationId property.

Note, in most cases developers do not need to manipulate KeyframeSequences as the animation editor covers most animation functionality. However, in some cases a developer may wish to generate an animation from a Script or build their own plugin.

KeyframeSequence Properties

The priority and looped animation settings are set by KeyframeSequence/Priority and KeyframeSequence/Loop. Note these can be eventually overwritten by the AnimationTrack properties.

The length of an animation is determined by the last Keyframe in the sequence, meaning the Keyframe with the highest Keyframe/Time property.

KeyframeSequence Structure

KeyframeSequences are a container that hold Keyframes. Keyframes represent a ‘key’ frame in the animation, that are interpolated between during playback.

Keyframes contain Poses. Poses are specific to each BasePart being animated and contain the CFrame applied to the Motor6D connecting to the part. Poses are named according to the BasePart they correspond with. For this reason, animations require distinct part names to play correctly.

Poses are structured based on joint hierarchy. Each Pose is parented to the Pose corresponding to the part it is attached to. In practice, this means the poses branch out from the root part. See below for a visual example.

Using KeyframeSequences when making animations

KeyframeSequences must be first uploaded to Roblox before they can be played. This can be done by right clicking on the KeyframeSequence and clicking ‘Save to Roblox’. Alternatively, Plugin/SaveSelectedToRoblox can be used. This will bring up the animation upload window.

In some cases, a developer may want to preview an Animation before uploading it to the Roblox site. This can be achieved by generating a temporary id using KeyframeSequenceProvider/RegisterKeyframeSequence. This will generate a hash id that can be used for localized animation testing.

Obtaining KeyframeSequences

In some cases the developer may wish to download the KeyframeSequence corresponding to an existing uploaded Animation. This can be done so using KeyframeSequenceProvider/GetKeyframeSequenceAsync.

Properties

float

AuthoredHipHeight

Contains the hip height of the Humanoid of the model that was used to author this KeyframeSequence
bool

Loop

Determines whether the animation created from the KeyframeSequence will be looped by default. When set to true the animation will continuously repeat each time the animation finishes.
AnimationPriority

Priority

Determines the default priority of an animation created from the KeyframeSequence.

Inherited from Instance: Show Hide

bool

Archivable

Determines if an Instance can be cloned using /Instance/Clone or saved to file.
string

ClassName

[ReadOnly] [NotReplicated]

A read-only string representing the class this Instance belongs to
int

DataCost

[ReadOnly] [NotReplicated] [Deprecated]

The cost of saving the instance using data persistence.
string

Name

A non-unique identifier of the Instance
Instance

Parent

[NotReplicated]

Determines the hierarchical parent of the Instance
bool

RobloxLocked

A deprecated property that used to protect CoreGui objects
bool

archivable

[Hidden] [NotReplicated] [Deprecated]
string

className

[ReadOnly] [NotReplicated] [Deprecated]

Functions

void

AddKeyframe ( Instance keyframe )

This function adds a Keyframe to the KeyframeSequence by parenting it to the KeyframeSequence.
Objects

GetKeyframes ( )

This function returns an array containing all Keyframes that have been added to a KeyframeSequence.
void

RemoveKeyframe ( Instance keyframe )

This function removes a Keyframe from the KeyframeSequence by setting its parent to nil.

Inherited from Instance: Show Hide

void

ClearAllChildren ( )

This function destroys all of an Instance's children.
Instance

Clone ( )

Create a copy of an object and all its descendants, ignoring objects that are not Instance/Archivable|Archivable
void

Destroy ( )

Sets the Instance/Parent property to nil, locks the Instance/Parent property, disconnects all connections and calls Destroy on all children.
Instance

FindFirstAncestor ( string name )

Returns the first ancestor of the Instance whose Instance/Name is equal to the given name.
Instance

FindFirstAncestorOfClass ( string className )

Returns the first ancestor of the Instance whose Instance/ClassName is equal to the given className.
Instance

FindFirstAncestorWhichIsA ( string className )

Returns the first ancestor of the Instance for whom Instance/IsA returns true for the given className.
Instance

FindFirstChild ( string name , bool recursive )

Returns the first child of the Instance found with the given name.
Instance

FindFirstChildOfClass ( string className )

Returns the first child of the Instance whose Instance/ClassName|ClassName is equal to the given className.
Instance

FindFirstChildWhichIsA ( string className , bool recursive )

Returns the first child of the Instance for whom Instance/IsA returns true for the given className.
Instance

GetActor ( )

Variant

GetAttribute ( string attribute )

Returns the attribute which has been assigned to the given name
RBXScriptSignal

GetAttributeChangedSignal ( string attribute )

Returns an event that fires when the given attribute changes
Dictionary

GetAttributes ( )

Returns a dictionary of string → variant pairs for each of the Instance|Instance’s attributes
Objects

GetChildren ( )

Returns an array containing all of the Instance's children.
string

GetDebugId ( int scopeLength )

[NotBrowsable]

Returns a coded string of the Instances DebugId used internally by Roblox.
Array

GetDescendants ( )

[CustomLuaState]

Returns an array containing all of the descendants of the instance
string

GetFullName ( )

Returns a string describing the Instance's ancestry.
RBXScriptSignal

GetPropertyChangedSignal ( string property )

Get an event that fires when a given property of an object changes.
bool

IsA ( string className )

[CustomLuaState]

Returns true if an Instance's class matches or inherits from a given class
bool

IsAncestorOf ( Instance descendant )

Returns true if an Instance is an ancestor of the given descendant.
bool

IsDescendantOf ( Instance ancestor )

Returns true if an Instance is a descendant of the given ancestor.
void

Remove ( )

[Deprecated]

Sets the object’s Parent to nil, and does the same for all its descendants.
void

SetAttribute ( string attribute , Variant value )

Sets the attribute with the given name to the given value
Instance

WaitForChild ( string childName , double timeOut )

[CustomLuaState] [CanYield]

Returns the child of the Instance with the given name. If the child does not exist, it will yield the current thread until it does.
Objects

children ( )

[Deprecated]

Returns an array of the object’s children.
Instance

clone ( )

[Deprecated]
void

destroy ( )

[Deprecated]
Instance

findFirstChild ( string name , bool recursive )

[Deprecated]
Objects

getChildren ( )

[Deprecated]
bool

isA ( string className )

[Deprecated] [CustomLuaState]
bool

isDescendantOf ( Instance ancestor )

[Deprecated]
void

remove ( )

[Deprecated]

Events

Inherited from Instance: Show Hide

RBXScriptSignal

AncestryChanged ( Instance child , Instance parent )

Fires when the Instance/Parent property of the object or one of its ancestors is changed.
RBXScriptSignal

AttributeChanged ( string attribute )

Fires whenever an attribute is changed on the Instance
RBXScriptSignal

Changed ( string property )

Fired immediately after a property of an object changes.
RBXScriptSignal

ChildAdded ( Instance child )

Fires when an object is parented to this Instance.
RBXScriptSignal

ChildRemoved ( Instance child )

Fires when a child is removed from this Instance.
RBXScriptSignal

DescendantAdded ( Instance descendant )

Fires when a descendant is added to the Instance
RBXScriptSignal

DescendantRemoving ( Instance descendant )

Fires immediately before a descendant of the Instance is removed.
RBXScriptSignal

childAdded ( Instance child )

[Deprecated]

Code Samples

Get KeyframeSequence Length

This sample contains a simple function that will get the length of a KeyframeSequence by finding the Keyframe with the highest Keyframe.Time value.

local function getSequenceLength(keyframeSequence)
	local length = 0
	for _, keyframe in pairs(keyframeSequence:GetKeyframes()) do 
		if keyframe.Time > length then 
			length = keyframe.Time 
		end
	end
	return length
end

Create temporary animation

This code sample contains a simple function to generate an Animation with a generated hash ID to preview a KeyframeSequence locally.

    local KeyframeSequenceProvider = game:GetService("KeyframeSequenceProvider")
    
    local function createPreviewAnimation(keyframeSequence)
    	local hashId = KeyframeSequenceProvider:RegisterKeyframeSequence(keyframeSequence) 
    	if hashId then 
    		local Animation = Instance.new("Animation")
    		Animation.AnimationId = hashId
    		return Animation
    	end
    end

KeyframeSequence Instantiation

This sample demonstrates how a basic KeyframeSequence can be created.

-- create the keyframesequence
local keyframeSequence = Instance.new("KeyframeSequence")
keyframeSequence.Loop = false
keyframeSequence.Priority = Enum.AnimationPriority.Action

--  create a keyframe
local keyframe = Instance.new("Keyframe")
keyframe.Time = 0

-- create sample poses
local rootPose = Instance.new("Pose")
rootPose.Name = "HumanoidRootPart"
rootPose.Weight = 0

local lowerTorsoPose = Instance.new("Pose")
lowerTorsoPose.Name = "LowerTorso"
lowerTorsoPose.Weight = 1

-- set the sequence hierarchy
rootPose:AddSubPose(lowerTorsoPose) -- lowerTorsoPose.Parent = rootPose
keyframe:AddPose(rootPose) -- rootPose.Parent = keyframe
keyframeSequence:AddKeyframe(keyframe) -- keyframe.Parent = keyframeSequence

-- parent the sequence 
keyframeSequence.Parent = workspace
KeyframeMarker KeyframeSequenceProvider