@polygonjs/polygonjs/src/engine/functions/_GetSibbling.ts

node-based WebGL 3D engine https://polygonjs.com

import {Object3D} from 'three';
import {mod} from '../../core/math/_Module';
import {ObjectNamedFunction1} from './_Base';

export class getSibbling extends ObjectNamedFunction1<[number]> {
	static override type() {
		return 'getSibbling';
	}
	func(object3D: Object3D, offset: number) {
		const parent = object3D.parent || object3D;
		const children = parent.children;
		const currentIndex = children.indexOf(object3D);

		if (currentIndex < 0) {
			return object3D;
		}
		const index = mod(currentIndex + offset, children.length);
		const sibbling = children[index] || object3D;
		return sibbling;
	}
}