---
title: kTweenInterpolationID
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/ktweeninterpolationid
---

# kTweenInterpolationID

An atom that specifies an interpolation tween atom to use for a specified tween data atom.

## Overview

Overview Specifies an interpolation tween atom to use for a specified kTweenData atom. There can be any number of kTweenInterpolationID atoms for a tween atom, one for each kTweenData atom to be interpolated. Its parent atom is a kTweenEntry atom. The index of a kTweenInterpolationID atom specifies when it was added to the kTweenEntry atom; the first added has the index 1, the second 2, and so on. The ID of a kTweenInterpolationID atom must match the atom ID of the kTweenData atom to be interpolated, and be unique among the kTweenInterpolationID atoms contained in the same kTweenEntry atom. This atom is a leaf atom. The data type of its data is QTAtomID. This atom is required for an interpolation tween atom.

## See Also

### Interpolation Tween Atoms

- [kTweenOutputMax](quicktime-file-format/ktweenoutputmax.md)
- [kTweenOutputMin](quicktime-file-format/ktweenoutputmin.md)