Reusable collection of keyframes affecting particular property of an object.

Each AnimationSampler refers to an input and an output Accessor. Input contains times (in seconds) for each keyframe. Output contains values (of any Accessor.Type) for the animated property at each keyframe. Samplers using CUBICSPLINE interpolation will also contain in/out tangents in the output, with the layout:

in1, value1, out1, in2, value2, out2, in3, value3, out3, ...


// Create accessor containing input times, in seconds.
const input = doc.createAccessor('bounceTimes')
    .setArray(new Float32Array([0, 1, 2]))

// Create accessor containing output values, in local units.
const output = doc.createAccessor('bounceValues')
    .setArray(new Float32Array([
        0, 0, 0, // y = 0
        0, 1, 0, // y = 1
        0, 0, 0, // y = 0

// Create sampler.
const sampler = doc.createAnimationSampler('bounce')





Property type.

Interpolation: Record<string, AnimationSamplerInterpolation> = ...

Interpolation method.


  • Events.

  • dispose(): void
  • Removes both inbound references to and outbound references from this object. At the end of the process the object holds no references, and nothing holds references to it. A disposed object is not reusable.

  • Returns true if two properties are deeply equivalent, recursively comparing the attributes of the properties. Optionally, a 'skip' set may be included, specifying attributes whose values should not be considered in the comparison.

    Example: Two Primitives are equivalent if they have accessors and materials with equivalent content — but not necessarily the same specific accessors and materials.

  • getDefaults(): Nullable<IAnimationSampler>
  • getExtension<Prop>(name: string): Prop
  • getExtras(): Record<string, unknown>
  • getName(): string
  • init(): void
  • isDisposed(): boolean
  • Returns true if the node has been permanently removed from the graph.

  • listExtensions(): ExtensionProperty<IProperty>[]
  • listParents(): Property<IProperty>[]
  • Returns a list of all properties that hold a reference to this property. For example, a material may hold references to various textures, but a texture does not hold references to the materials that use it.

    It is often necessary to filter the results for a particular type: some resources, like Accessors, may be referenced by different types of properties. Most properties include the Root as a parent, which is usually not of interest.


    const materials = texture
        .filter((p) => p instanceof Material)
Function symbol, f(📦) → 📦, where the argument and output are a box labeled 'glTF'.

Made by Don McCurdy TypeDoc documentation Copyright 2021 under MIT license