We have elaborated technology available on modern devices. But what about older devices? Let's try out:
In older browsers, only 2d graphics is available.
We thus focus our efforts into contueing the development of the last few pages, instead of turning to the 3d context. I think that everything must be possible without using 3d graphic interface as well - a slower performance might be the result, though.
Especially the application of textures is going to be an interesting point.
But first, lets continue with the ray intersection thing from the last page.