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Screen Space
Screen space (also called eye-space) is a coordinate space that represents the bounds of a computer monitor in computer graphics. Screen space coordinates are made up of x,y offsets relative to the origin at one corner of the screen and a depth component (z). The x and y dimensions of screen space represent physical pixels on the screen, where as depth represents the drawing order of objects on the screen. Screen space is an abstraction for various memory buffers used by drawing libraries, that allows programers to understand and modify drawing library output prior to it being displayed on the screen.
Screen space is analogous to world space when working with 2D graphics, but when working with 3D graphics represents the result of projecting 3-dimensional objects into 2D space.