vector3d is structure used to describe a 3-dimensional vector in double-precision floating-point form.  This data type is the most precise vector format supported by L3DT.
Vectors may or may not be normalised.
In Zeolite_defines.h:
typedef struct { double x, y, z; } vector3d
| Member name | Type | Comments | 
|---|---|---|
| x | double | The vector component in the x-axis. | 
| y | double | The vector component in the y-axis. | 
| z | double | The vector component in the z-axis. |