var vel[3] = (0, 0, 0);//velocity in x, y, z

I think should be

var vel[3] = {0,0,0};
or if just enter 1 0 they are all set to zero (i do this and it works)

var vel[3] = {0};

"There is no problem that can't be solved with time and determination." -me
prenceofdarkness for instant messages on AIM.

Looking for a model designer
PLEASE, SEND ME A PRIVATE MESSAGE OR EMAIL IF YOU'RE INTERESTED.