i've almost finished the core of my engine, and i want to begin writing the function(s) that will load the user created worlds into the game. i have a couple questions:

1. what file format is "best"? (bsp, .X)? ( and easiest!)

2. what is the best way to go about it?

3. are there any good tutorials for rendering from your chosen file format?

thanks very much to all that can help. these boards have been a great help me to me.