Fixed, thanks didn't know it def had to be mine. I guess it makes sense - otherwise everything would be Show HN.
For painting I think in this demo you can only use the dropdown near the load icon to upload an image that will be used as a texture. But haven't played with it enough to know if there are other ways.
How can I paint the objects? I couldn't find that in the docs.
[1] https://news.ycombinator.com/showhn.html