Simple Ray Tracer

One of my assignments for my Computer Graphics II (CS488) course involved creating a simple ray tracer in C.
Keyboard Commands:
- q: quits
- 1-4: set block size (1 looks best, but takes the longest to render)
- w: move forward
- s: move backward
- a: move left
- d: move right
- Shift-w: move up
- Shift-s: move down
- Space: Look at glass