Transparent Background

Hi, I am wondering how to create a transparent background for the rendering canvas. I followed the instructions from this post, hoping it would work, but it doesn’t. Below is a dump of code the code, that I have. It’s mostly standard, except for:
– I passed { alpha: true } as a parameter to new v3d.App (…)
– I set the clear color like this app.renderer.setClearColor( 0x000000, 0 );

Am I missing something?

Any help is greatly appreciated!

'use strict';

window.addEventListener('load', function() {

var URL = '__URL__LogicTest.gltf';
var LOGIC = '__LOGIC__visual_logic.js';
    
var url = URL.replace('__URL__', '') || v3d.AppUtils.getPageParams().load;
if (!url) {
    console.log('No URL specified');
    return;
}

var app = new v3d.App('container', { alpha: true }, new v3d.SimplePreloader({ container: 'container' }));

app.load(url, function() {

    app.enableControls();
    window.v3dApp = app;
    
    app.renderer.setClearColor( 0x000000, 0 );

    var logic_url = v3d.AppUtils.getPageParams().logic;
    if (!logic_url || !isXML(logic_url))
        logic_url = LOGIC.replace('__LOGIC__', '') || logic_url;

    if (logic_url)
        initPuzzles(logic_url);
 
    runCode();        
});

function isXML(url) {
    return (url.indexOf('.xml') > -1);
}

function initPuzzles(logic_url) {

    // namespace for communicating with code generated by Puzzles 
    window.v3dApp.ExternalInterface = {};

    // running Puzzles editor
    if (isXML(logic_url)) {

        var puzzlesDir = '../puzzles/';

        v3d.AppUtils.loadScript(puzzlesDir + 'puzzles.min.js', document.body, function() {
            PE.init(puzzlesDir + 'media/');
        });

        // load Puzzles editor css
        var link = document.createElement('link');
        link.rel = 'stylesheet';
        link.type = 'text/css';
        link.href = puzzlesDir + 'puzzles.css';
        document.head.appendChild(link);

    // loading generated JS code
    } else {
        v3d.AppUtils.loadScript(logic_url, document.body, function() {});
    }
}

function runCode() {
    // add you code here, e.g. console.log('Hello, World!');
}

});