Get url of a 3D PDF. It takes a while to generate the URL after generate3DPDF is called. Users have to poll the URL. Moreover, the URL is a temporary one. It will expire after a short of period of time for secure reason. Users have to download PDF as soon as she has the URL.
function get3DPDFURL(PDFId: number): Promise<string>;
|PDFId||The id of 3D PDF|
a promise contains a url string