Fancy Compass

At one time, I was working on a 4D graphics engine for a 4D FPS based on 50's horror movies. I developed the math for 4D to 3D perspective projections, but got distracted and didn't go much farther. I've put a little more thought into the game and started making a 4D compass to help with navigation. The game allows left/right and up/down rotation in 3 dimensions like in a normal FPS as well as side/side and back/forward rotation in the fourth dimension. The hypercube inside the sphere to reflect the player's movements. The current version works in 3 dimensions. The next step is to make an object to hold information about the cube, rotate it, project it to 3 dimensions, rotate it again, and display it.