Calculate the vertical FOV from focal length

To set the camera’s vertical field of view (FOV) using focal length, sensor width, and aspect ratio:

How to implement

Using npm :


npm install @a3d-viewer/viewer

Implementation :


import { focalToFov } from '@a3d-viewer/viewer'
 
const focal = 50 // mm
const sensorWidth = 36 // mm
const width = viewer.offsetWidth
const height = viewer.offsetHeight
 
const verticalFov = focalToFov(focal, sensorWidth, width, height)
viewer.viewerDetails.camera.fov = verticalFov

This allows you to set the camera FOV based on real-world lens parameters.