Interface TrackOptionsAdvanced

Interpolation algorithm used between keyframes

The property this track drives, as '<node>.<property>', such as 'Hips.quaternion'

The player splits the label at its last . and looks for a node with that label, or a bone of a skinned mesh with that name, in the subtree of AnimationPlayerOptions#target. On a bone the property is position, quaternion or scale. On a node it is a Vector3 or ObservableVector3, quaternion, number or numeric array property, such as position, x or weights. A label that matches nothing, or a property of another type, is ignored without a warning.

Tracks loaded from glTF name their node by its index in the file, which only the player of a Model3D resolves.

Keyframe times in seconds, in ascending order

Keyframe values, valueSize numbers per keyframe, in the order of times

A 'CUBICSPLINE' track stores three groups per keyframe instead: in-tangent, value and out-tangent, each valueSize long. Tangents are rates of change per second, as glTF stores them.

Number of numeric components in each keyframe value, such as the morph-target count of a weights track

NumberTrack, Vector3Track and QuaternionTrack set it for you.