How to get status if v3d in js?

Hi

I am trying to detect when Verge3D has loaded outside the auto built scripts (visual_logic.js).

in my own test.js file, after waiting a few seconds, I can do:

var D3WebGL = document.getElementById(“web3d”); //iframe
var win = D3WebGL.contentWindow;
var myAppInstance = win.v3d.apps[0];

Which works but I need a way to determine “when” the web3d canvas has loaded inside the iframe and not the iframe itself.

v3d.js is obfuscated so I can not trawl through it.

Thanks for any help
Geoff