Irrlicht Engine

One more question

What sort of polycount is this engine capable of handling for main characters in games of a 1st person shooter type? Or perhaps even better, what is the functional range (from lowest to highest)?

A few more questions if you dont mind =)

If I were to start a project now in version .4 will I be able to import this into version .5? I would just hate to start a project and hav new versions come out that I cant use =)