HOW TO AIM stuff
The first value is more important, and can be a little confusing.
Directions
N
W E
S
X / Y axes
y
-x x
-y
(x,y,z)
100, 0, 0 fires directly east.
-100, 0, 0 fires directly west.
0, 100, 0 fires directly north.
0, -100, 0 fires directly south.
0, 0, 100 fires directly up.
0, 0, -100 fires directly down.
100 100 100 will fire northeast at a 45 degree angle upward.
The second value is spread, and can be valuable if used right.
Let's assume you are firing directly sideways.
25, 0, 0 will vary the velocity across the x-axis.
For every projectile that is fired, instead of, for example, 100 100 100, it will be varied between 75 100 100 and 125 100 100.
If you are firing directly east or west, some projectiles will be slow, and some projectiles will be fast.
If you are firing directly north or south, the projectiles will spawn at random angles.
25 25 0 will also vary their velocity on the y-axis (north/south).
It won't matter which direction they fire, they will go at random angles and speeds.
0 0 25 will create random angles up or down. If you are firing straight up, they will have varied speeds.
25 25 25 creates a "perfect" spread, and will equally vary angles/height/speed no matter what direction is set.