# A trigger controller is required for the model to be displayed

**URL:** https://discourse.threejs.org/t/a-trigger-controller-is-required-for-the-model-to-be-displayed/39973
**Category:** Questions
**Tags:** controls
**Created:** [July 4, 2022, 9:35am UTC](https://discourse.threejs.org/t/a-trigger-controller-is-required-for-the-model-to-be-displayed/39973 "2022-07-04T09:35:45Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![jjjsd](https://avatars.discourse-cdn.com/v4/letter/j/d6d6ee/32.png) [@jjjsd](https://discourse.threejs.org/u/jjjsd)
#### Post date: [July 4, 2022, 9:35am UTC](https://discourse.threejs.org/t/a-trigger-controller-is-required-for-the-model-to-be-displayed/39973/1 "2022-07-04T09:35:45Z")

</div>

After reloading the model, directly change the camera position, the model is not displayed, you need to trigger the camera track controller first, before changing the camera position. Why

---

<div class="post-metadata">

### Author: ![Mugen87](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/mugen87/32/5645_2.png) [@Mugen87](https://discourse.threejs.org/u/Mugen87)
#### Post date: [July 4, 2022, 9:36am UTC](https://discourse.threejs.org/t/a-trigger-controller-is-required-for-the-model-to-be-displayed/39973/2 "2022-07-04T09:36:14Z")

</div>

Probably to update the internal state of the controls. What control class are you using?