iam very new to opengl…pls help me with this basic Q.
my question is this…
we specify coord’s through glVertex*() and this gets transformed and projected to window coord’s.
now, from the window coords how can i get the original vertex coords back ??
Do some reading on glUnproject. This will recover the x and y position, but you need to supply the z position because this is lost when the transform goes from 3d (world) to 2d (screen) space.
So, given a z in 3d and a screen space position in 2d (x, y), it will find you the correct x, y for the given z.
Hope this helps!
gluUnProject (I mean) - not glUnproject!!