During the breaks finishing off my current project I'm thinking I want to have a look at making a 3d "game" next. I want to give it a go anyway. I have been searching around a bit and there are a few engines available. 1) SIO2 - uses blender models & scenes. cost $365 loads of tutorials. 2) google app kit - again uses blender - free but I've read difficult to use and I've found very little information and tutorials. 3) unityd3 - know very little about this one - $400 4) shiva3d - Looks really good. Free to play with and the editor is $169 (req. to ship something) Before I start spending money, have anyone uses any of these? I'm particularly interested in shiva3d and google app kit.