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Mastering Unity Scripting by Alan Thorn

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Orthographic cameras

Every newly created camera object in Unity is, by default, configured as a perspective camera, unless you change the default settings. This type of camera most closely corresponds to real-life cameras that have a position within the 3D space, a curved lens, and employ methods to convert captured images onto a flat, 2D surface, like a screen. The chief symptom of such a camera is foreshortening, the name given to the distortion applied to rendered objects. Specifically, rendered objects grow smaller as they recede into the distance, the shape and appearance of objects change as they move further from the center of vision, and all parallel lines converge at a vanishing point somewhere in the distance, whether on the horizon ...

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