Can anyone explain me how this function works and what it returns, because I looked it up here : http://www.conitec.net/beta/pXent_getbounds.htm

But they don't explain the format the bounds are returned in.

it returns 1 if successful, 0 otherwise.

The manual page says it sets the vecOut to dimensions of the bounding box.

yea but what format is vecOut, a vector with the width, height en depth of a object or 2 vectors describing the bounding box ?

vector is probably in VECTOR format. a single vector with width, depth and height.

you can then use model's orientation to figure out where the actual box is.