@woosh/meep-engine/src/engine/ecs/parent/entity_node_compute_bounding_box.js

Pure JavaScript game engine. Fully featured and production ready.

import { ShadedGeometry } from "../../graphics/ecs/mesh-v2/ShadedGeometry.js";
import { AABB3 } from "../../../core/geom/3d/aabb/AABB3.js";

const scratch_aabb3 = new AABB3();

/**
 *
 * @param {AABB3} out
 * @param {EntityNode} root
 */
export function entity_node_expand_bounding_box_to_fit(out, root) {
    const sg = root.entity.getComponent(ShadedGeometry);

    if (sg !== null) {
        sg.getBoundingBox(scratch_aabb3);

        out.expandToFit(scratch_aabb3);
    }

    const children = root.children;
    const child_count = children.length;

    for (let i = 0; i < child_count; i++) {
        const child = children[i];

        entity_node_expand_bounding_box_to_fit(out, child);
    }
}

/**
 *
 * @param {AABB3} out
 * @param {EntityNode} root
 */
export function entity_node_compute_bounding_box(out, root) {
    // init bounds
    out.setNegativelyInfiniteBounds();

    // expand bounds to fit the tree
    entity_node_expand_bounding_box_to_fit(out, root);
}