I've returned

I'm back! I'd hoped to have remained active during the last semester, but I turned out to be more busy that I expected.

Anyway, I've been coding a bit over the last few days and I've now got working stairs. It took me a while to write the framework for ascending/descending stairs, because I wanted it to be robust. How it is now, I can later add ladders, ropes, fences, and even tree climbing; with little extra code.

The skyranger now has two levels and you have to go down the stairs to exit. Next I need to make it so that if your agent walks into 'air', he/she will fall until hitting something solid.