SparkAR requestAnimationFrame alternative.

script.js

const t = require('Time');
const D = require('Diagnostics');
const Scene = require('Scene');

const objText = Scene.root.find('2dText0');
let frame = 0;

const round = (val, precision = 1) => {
	const multiplier = Math.pow(10, precision || 0);
	return Math.round(val * multiplier) / multiplier;
}

t.ms.monitor().subscribe(evt => {
	frame++;
	objText.text = `FPS: ${round(frame / (evt.newValue / 1000))}`
});