# Functions to calculate the visible width / height at a given z-depth from a perspective camera

**URL:** <https://discourse.threejs.org/t/functions-to-calculate-the-visible-width-height-at-a-given-z-depth-from-a-perspective-camera/269>\
**Category:** Resources\
**Tags:** perspective-camera, camera\
**Created:** [April 28, 2017, 10:02am UTC](https://discourse.threejs.org/t/functions-to-calculate-the-visible-width-height-at-a-given-z-depth-from-a-perspective-camera/269 "2017-04-28T10:02:14Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![yangzh8343](https://avatars.discourse-cdn.com/v4/letter/y/e9bcb4/32.png) [@yangzh8343](https://discourse.threejs.org/u/yangzh8343)\
**Post date:** [October 15, 2018, 3:01am UTC](https://discourse.threejs.org/t/functions-to-calculate-the-visible-width-height-at-a-given-z-depth-from-a-perspective-camera/269/20 "2018-10-15T03:01:37Z")

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I need these function,thank you

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_[View the full topic](https://discourse.threejs.org/t/functions-to-calculate-the-visible-width-height-at-a-given-z-depth-from-a-perspective-camera/269)._