Check it out. It's called Cortona and it's VRML based. This is the only thing I've been able to find out about 3D on PocketPC.
I think they have a modeler, too. You can always convert.
I am interested in finding more 3D applications on the Axim.
I work with intelligent 3D mapping for PCs. Similar to 3D-GIS.
LINK
-Jason Jessup
kryptonica@yahoo.com