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    Class KeyframesAnimation

    Helper class to use for transformation (position, scale or rotation) and morph targets weights animations (can also be used for skin joint matrices animations using only the onAfterUpdate callback).

    This class is not made to be used alone but should rather be handled by a TargetsAnimationsManager instance instead.

    Index

    Constructors

    constructor

    Properties

    label inputIndex keyframes values duration path type inputValue interpolation onAfterUpdate

    Methods

    addBindingInput getCubicSplineComponentValue getIndexFromInterpolation update

    Constructors

    Properties

    label: string

    Optional label of the KeyframesAnimation.

    inputIndex: number

    Optional input accessor index defined in the glTF, used to keep different TargetsAnimationsManager in sync if they're using the same input.

    keyframes: TypedArray

    Keyframes Float32Array of the KeyframesAnimation. Could be omitted when used for a skin joint matrices animation.

    values: TypedArray

    Values Float32Array of the KeyframesAnimation to use for animation, mapped to the keyframes array. Could be omitted when used for a skin joint matrices animation.

    duration: number

    Total duration of this animation, i.e. the last keyframes value.

    path: AnimationChannelTargetPath

    glTF animation path to use, i.e. what component should be animated between 'translation', 'rotation', 'scale' and 'weights'. Could be omitted when used for a skin joint matrices animation.

    type: KeyframesAnimationValueType

    Type of the value being animated. Could be omitted when used for a skin joint matrices animation.

    inputValue: KeyframesAnimationInputValue

    Input value being animated. Could be omitted when used for a skin joint matrices animation.

    interpolation: AnimationSamplerInterpolation

    glTF sampler interpolation to use, i.e. how the animated values should be computed. Default to LINEAR .

    onAfterUpdate: () => void

    Callback to run after the animated value has been updated. Used for skin joints animations to update joint matrices.

    Methods

    • Get a cubic spline interpolation value.

      Parameters

      • t: number

        Current time value to use in the [0, 1] range.

      • prevComponentValue: number

        Previous value to use for interpolation.

      • nextComponentValue: number

        Next value to use for interpolation.

      • prevOutputTangentValue: number

        Previous output tangent value to use for interpolation.

      • nextInputTangentValue: number

        Previous output tangent value to use for interpolation.

      Returns number

    • Get the index from which to return a value from the values array based on an index in the keyframes array and the size of the component to animate.

      Parameters

      • index: number = 0

        Index in the keyframes array to use.

      • size: number = 1

        Size of the component to animate in the values array.

      Returns number

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