Hmm. I've got a pretty decent pathfinding algorithm that handles flat surfaces with a height variation of no more than 100 quants. I will wait for your 3d solution (which is no trivial task). Good luck with that.
Windows XP, SP2
Commercial Edition V6.31.4
Pentium 4 CPU 3.4Ghz (2 CPUs)
510MB RAM
NVIDIA GeForce FX Go5200 64MB