# Custom keytrack interpolant

**URL:** <https://discourse.threejs.org/t/custom-keytrack-interpolant/58561>\
**Category:** Questions\
**Tags:** animation\
**Created:** [November 25, 2023, 9:37pm UTC](https://discourse.threejs.org/t/custom-keytrack-interpolant/58561 "2023-11-25T21:37:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![waverider404](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/waverider404/32/2842_2.png) [@waverider404](https://discourse.threejs.org/u/waverider404)\
**Post date:** [November 25, 2023, 9:37pm UTC](https://discourse.threejs.org/t/custom-keytrack-interpolant/58561/1 "2023-11-25T21:37:26Z")

</div>

Hello,

I am having issue creating a custom Interpolant for my vectorKeyFrameTrack, the effect i want to achieve can be seen with the second cube which is animated using createjs tween. added a sandbox

[https://codesandbox.io/p/sandbox/affectionate-flower-72drzh?file=%2Fsrc%2Findex.mjs%3A49%2C5](https://codesandbox.io/p/sandbox/affectionate-flower-72drzh?file=%2Fsrc%2Findex.mjs%3A49%2C5)

[codesandbox](https://codesandbox.io/p/sandbox/affectionate-flower-72drzh?file=%2Fsrc%2Findex.mjs%3A49%2C5)

Anyone? 🥲