Cameras in FPSs: how do they work

[Legion]

wrt to the HL, Quake1-3 and Doom3 engines how does the FOV command work? When the FOV angle is determined how is the image on the screen derived from what you can see?


edit: Fixed the title

[Nick]

The FOV is a parameter in the camera's projection matrix. Both DirectX and OpenGL have functions to set up a projection matrix. I suggest a book like Real-Time Rendering (http://www.realtimerendering.com/) for the in-depth math.