I am using c/c++ and interested in making different types of numerical simulations. Different modelling and systems rendered in 3d. 1) What are the best/notable 3d engines? 2) How advanced do I need to be to do this? 3) Are there any tutorials or guides to doing this. I'm interested in building physical, weather, and economics simulations.....and other complex systems. I currently have a basic understanding of C/C++.... Thank you!