Does anyone know of a good tutorial on picking? My questions are how and what should I store in my linked list and how to I compare that region with x and y coordinates that I am getting from the mouse. The only tutorials I''m seeing are in 3D and I''m unable to follow them at this point! Any help would be greatly appreciated. Thanks

If I was you, I''d consider writing my own trace/selection code.

If I was you, I''d consider writing my own trace/selection code.

http://www.lighthouse3d.com/opengl/picking/

It''s quite simple but it points you in the right direction...

Use the tutorial from gametutorials.com, it helped me learn picking. To be honest, there is like 3 commands that you use and they are butt simple.

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Ah, but those 3 commands provide resolution limits. Unless I missed something when reading the docs, that uses per-object identifications.

Try using that for a terrain mesh (as with issuing orders in a RTS game). In order to get any real accuracy, a name for each triangle will have to used.

What you use depends on what you need.
Resolution (and, often speed, esp w/ multiple checks/frame) -> custom
Ease of use -> built in