backend/libs/three/helpers/Box3Helper.js

import { LineSegments } from '../objects/LineSegments.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { BufferAttribute } from '../core/BufferAttribute.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
import { BufferGeometry } from '../core/BufferGeometry.js';

class Box3Helper extends LineSegments {
	constructor(box, color = 0xffff00) {
		const indices = new Uint16Array([0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7]);

		const positions = [1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1];

		const geometry = new BufferGeometry();

		geometry.setIndex(new BufferAttribute(indices, 1));

		geometry.setAttribute('position', new Float32BufferAttribute(positions, 3));

		super(geometry, new LineBasicMaterial({ color: color, toneMapped: false }));

		this.box = box;

		this.type = 'Box3Helper';

		this.geometry.computeBoundingSphere();
	}

	updateMatrixWorld(force) {
		const box = this.box;

		if (box.isEmpty()) return;

		box.getCenter(this.position);

		box.getSize(this.scale);

		this.scale.multiplyScalar(0.5);

		super.updateMatrixWorld(force);
	}
}

export { Box3Helper };