I've been working on my 3D Lisp project recently, between changing diapers and running places for my wife. I have a new prototype that uses vecto and can make some cool effects. Most of the base functionality is there, I just have to figure out how to structure it. This is where my inexperience with Lisp really shows: how should I store the data I need? Most languages prefer certain data types. Not Lisp! I can make trees, hashes, objects, structures, closures, or a host of other types. That means I have to figure out if I need vector types or just a list of two or three numbers. Objects are faster, but lists are more flexible. There is always a trade-off.
Anyway, now I need an Erlang-style message passing system for my threads so I can run things in the background while I update the screen. I might use Erlang-in-Lisp but I need to look at that library some more. I have a few concerns about performing large operations in the background while trying to update the screen but I will burn that bridge when I get to it.
I also want to start using vertex arrays. I don't think it should be much harder than what I am doing now using gl-begin and gl-end and should be much faster. Once that is complete I should be able to add and remove items from the scene from the command line. Then the real work begins: giving Qix functionality. I need to create gui elements, message stacks, etc... Qix is not a "game" engine. It will in time replace my Emacs as an everything editor but include graphics, sound, 3-d, etc.
That's all I have for an update right now. As usual, please leave a message if you have any questions.