while
// Create 10 balls along X axis, from 0 to 9
#declare BallCount = 0;
#while (BallCount < 10)
sphere {
<BallCount,0,0>, // NOTE: <0,0,0>, <1,0,0>, <2,0,0>, etc.
0.5
}
#declare BallCount = BallCount+1; // increment our counter
#end