Don't know where exactly the problem lies, since I export it from 3DS max to .obj. Import it in blender (where everything is still fine). Export it to .xml then, and convert it to .g3d. But the .g3d is... well... 'wrong' it goes rotated 90° towards the ground (so it lies on the ground, in most of the cases).
Any suggestions on how to fix that? Pretty hard to imagine mushroom people coming out of giant mushrooms that lie on the ground...