Is it possible to get the world coordinates in 2D given the screen coordinates( relative to the context beeing displayed )?

And vice-versa?

I need this to select objects in the screen using the...

Does anybony know how I can draw a thick line with a circular shape, instead of using glLineWidth?

I'm drawing maps and I was using Windows GDI, and it looked very pretty but slow, but now it's...

How Can I write a text in OpenGL in any angle?

thx, rgds,

Marcelo