I have Plane made of tiles in opengl. I start drawing them at (0, 0, -20) after that i do my translations so that the view is rotated somewhat similar to an isometric (kind of) perspective.
I'd now like to know, how many tiles are visible in each direction. So what i need to know basicly is, which coordinates (int the "before translation" - space) are now visible in the translated view.
The "tiles" before the translations" (for example in x direction there are 14 tiles visible):
And after the translations ( now there are 28 tiles visible in "old" x direction):
I tried to get the visible area via gluUnproject with no success.
EDIT: I already asked this question when i was trying to build the exact same thing in 2D and i got a good answer:
maybe this helps to describe my problem further.