public Trail(Thing body, int length, int freq) {
		// Initialize a path
		this.path = new Vector3D[length];
		this.body = body;
		this.freq = freq;
		for (int i = 0; i < path.length; i++) {
			path[i] = body.position.clone();
			if (body.parent != null) {
				path[i].subtract(body.parent.position);
			}
		}
	}