I work on PD since a few month. I need to use gridflow but #object can't be create, does someone know how to make them work ?

But perhaps it must have an alternative; I need to locate a man position with a camera.
I want do divide my screen in 9 zone (like a grid). Each zone is waiting for someone coming and when the man is locate on a zone, it trigger a video.

I don't know where to start.

I was thinking that i can make the virtual grid with picking coordonates of my screen;
for example : -4 -3 for X & 4 for Y is my first zone.( in open GL)

Don't hesitate to ask me more infos if you don't understand my need.

Thanks a lot