I found a cool modeling tool:
SharpConstructYou can quickly and easily model funny things. It exports the mesh in the standard Wavefront OBJ format. It's a good choice
but the material file with the obj mesh would have been still better! Anyway, that works and it's a freeware (yeah!).
Here is a test I've done with it:

and here is the Hyperion project (with ambient occlusion):
SharpConstruct_DemoThe biggest problem I met, is that SharpConstruct crashes when I wanted to resize the window. A little bug that will be certainly
fixed in the next release...