Detecting when 2d point is inside 3d shape?

[djx]

Hi,
I've been using gluLookAt to move the camera around (which works fine), but what I want is to know if I'm looking at something.
In other words, if a 2d point on my screen (like a crosshair or mouse pointer) is inside a 3d shape.

I think I need to get the 2d coordinates that correspond to the 3d position, however, this doesn't solve the issue of what to do if the shape is covered up by a different one (I don't want that to count).

Does anyone know how I can accomplish this?

[Mickelukas]

Google "OpenGL picking tutorial" and you'll get some examples. It's quite complex though in my opinion, especially when combining it with for example VBO's.

Mike

[djx]

Thanks. I'll try to report back if/when I find anything interesting.