SparkAR - can't change texture of material in code?

问题

I've here made sure to find all objects, Materials and Textures in the Promise.all of my script given that they take time to load in. I then set my textures to my materials, and no errors are drawn. However, the materials do not change.

I can't find anything wrong with my code:

Promise.all([

  //These take time to acquire..
    Scene.root.findFirst('ipad-perfect'),
    Scene.root.findFirst('iphone-perfect'),
    Scene.root.findFirst('computer-perfect'),
    Materials.findFirst('bg'),
    Materials.findFirst('mutablescreen'),
    Textures.findFirst('SUPERHOT-min')

]).then(function (results) {

    const ipadPerfect = results[0];
    const iphonePerfect = results[1];
    const computerPerfect = results[2];
    const bgMat = results[3];
    const mutableScreen = results[4];
    const superHotTexture = results[5];

    var devicesRot = 0;
    var gamesRot = 0;

    // Get the timer ready
    start();

    function start() {

      var texture = superHotTexture;
      bgMat.diffuse = texture;
      bgMat.emission = texture;

What am I doing wrong and how can I programmatically change the texture of a Material?

来源：https://stackoverflow.com/questions/62887649/sparkar-cant-change-texture-of-material-in-code