Irrlicht Engine

That would work, but it's a trial and error approach, it would be best to know beforehand what can be done and what cannot be done. Thanks!, the meshviewer is a good way to see the final work to fix any minor error.

Putting the question in perspective: If I'm going to pay some guy to model something, what are the restrictions he must consider, so irrlicht can load the model? It is desirable that the model is easily exported to a supported animated format and the model should look great (no hardware limitations)...