To protect your designs, they use a backend engine to render the image for the angle that you have selected, and deliver each frame to you as a JPG. The rendering is not happening in your browser. This keeps your source model private, always on their server, with only rendered images of it being delivered to the the customer.
Unfortunately, that means you can't use the same viewer software on your site.
There are browser-based STL viewers (such as the one available from threejs.org) but they send your STL to the end customer.. not a safe way to maintain your files.
Here's an example:
https://stonysmith.com/shapeways/stlviewer/?id=dragon
Last edited: Apr 27, 2021
kaadesign and Echoco like this.