Another modification to the tetra program

Another modification to the tetra program that i made my poor students do were to add a timer to the program. In the timer function the color of the four faces of the tetra are changed. Its a glittering program where the tetra changes color every second. Some may say i went crazy making the students do these modifications. They were begging me to explain the code and i could just mumble that you will not understand now. When i covered the topic on timers i guess they understood.

Here are the snapshots:

Here is the source.