3d image reconstruction from a 2d image (a bottle pointing from 2d to 3d)

edit

Hello Everyone

I am working on a spin the bottle game with OpenCV and a robot NAO. I already made a program to draw a line projecting to the pointing place of the bottle but in 2d (the robot can see just the bottle in a white background) with OpenCV now I would like to project that line into the 3d space in order to find a person which the bottle points to.

I don't know if ROS has special topics which I can subscribe to in order to ease my job (like topics where I can measure the deepness of an image or something like this...). If you could help me with something I would be very thankful to you.

Thanks