How to understand camera properties such as Position, Look Direction, Up Direction?

Question

I downloaded some examples from the Internet. but the sharpness always disappears when I change any Position value, or Look Direction, or Up Direction. I can not understand these properties, can someone help me?

What is the relationship between these properties? Is there a sample to show this relationship?

Answer 1

A position is a vector from the root of the scene (origin) to the camera.

Look direction - this is a unary vector located in the camera, which indicates the direction in which the camera is looking.

The upward direction is a unary vector that points to the "sky", I mean, points in the direction that the camera considers upward. Usually you use a (0,1,0) vector here.

Check here for more information.

Hope this helps.

Answer 2

Check out the 3-D graphical overview on MSDN, specifically the camera section .

Answer 3

Take a look at http://blogs.msdn.com/b/ebooth/archive/2005/12/07/500796.aspx