threepipe/lib/three/utils/camera.js

A 3D viewer framework built on top of three.js in TypeScript with a focus on quality rendering, modularity and extensibility.

import { Vector3 } from 'three';
/**
 * Find distance of camera at which the camera's fov fits the given bounding box dimensions
 * @param cam
 * @param box
 */
export function getFittingDistance(cam, box) {
    const size = box.getSize(new Vector3());
    let cameraZ = 1;
    if (cam.isPerspectiveCamera && size.length() > 0.0001) {
        const aspect = isFinite(cam.aspect) ? cam.aspect : 1;
        // get the max side of the bounding box (fits to width OR height as needed )
        const fov = Math.max(1, cam.fov) * (Math.PI / 180);
        const fovh = 2 * Math.atan(Math.tan(fov / 2) * aspect);
        const dx = size.z / 2 + Math.abs(size.x / 2 / Math.tan(fovh / 2));
        const dy = size.z / 2 + Math.abs(size.y / 2 / Math.tan(fov / 2));
        cameraZ = Math.max(dx, dy);
    }
    return cameraZ;
}
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