@woosh/meep-engine/src/engine/graphics/three/three_computeObjectBoundingBox.js

Pure JavaScript game engine. Fully featured and production ready.

import { Box3 } from "three";

/**
 *
 * @param {Object3D} object
 * @param {AABB3} result
 */
export function three_computeObjectBoundingBox(object, result) {
    const _sX = object.scale.x;
    const _sY = object.scale.y;
    const _sZ = object.scale.z;

    object.scale.set(1, 1, 1);

    const box3 = new Box3();

    box3.expandByObject(object);

    object.scale.set(_sX, _sY, _sZ);

    const min = box3.min;
    const max = box3.max;

    let x0 = min.x;
    let y0 = min.y;
    let z0 = min.z;
    let x1 = max.x;
    let y1 = max.y;
    let z1 = max.z;

    // validate and fix missing bounds
    if (x1 < x0) {
        // no bounds
        x0 = 0;
        x1 = 0;
    }

    if (y1 < y0) {
        // no bounds
        y0 = 0;
        y1 = 0;
    }

    if (z1 < z0) {
        // no bounds
        z0 = 0;
        z1 = 0;
    }


    result.setBounds(
        x0, y0, z0,
        x1, y1, z1
    );

}