change the style of contrackball
extend the assertext to support printing more information.
add Timer_fun.
lab.
add 3DGrid
modify 3DGrid to fit the boudningbox
ajust light position
lab.
rm 1.txt
draw background.
begin to implement a full simulator.
implemented a stvk simulator in full space.
fixed one bug for writing text vector.
home.
add the collison module, but the penalty forces is not supported yet.