I looked around and found a 3D engine by Trinitro21, here's the key: 43KNQEA6 If you use it make sure you give credit to him! I don't think it would be very good for big maps, but it has a 3D object renderer, a SNES mode7 single textured plane renderer and even a 4D renderer. I will look around some more to see if there is a better one for big maps.