vector3i is structure used to describe a 3-dimensional vector in 32-bit signed integer precision. 
Vectors may or may not be normalised.
In Zeolite_defines.h:
typedef struct { signed long x; signed long y; signed long z; } vector3i
| Member name | Type | Comments | 
|---|---|---|
| x | signed long | The vector component in the x-axis. | 
| y | signed long | The vector component in the y-axis. | 
| z | signed long | The vector component in the z-axis. |