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Mastering AndEngine Game Development
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Essential in a perspective projection is the concept of vanishing points. As anyone who has ever had to draw a perspective drawing in school knows, these are the imaginary lines that one draws from the subject to the horizon, which is the point where everything vanishes, meaning that they become too small to be visible any more.
This is summarized in a simple diagram here:

The distant line is the horizon. The imaginary lines moving away from the cube in the foreground indicate the scaling, with the vanishing points determined by the shape of the object. It should be fairly obvious that different object shapes will have different numbers and locations of vanishing points.
When drawing or working with perspective projections, you will, at some point, encounter the arch nemesis of vanishing points—natural scenes. While scenes with human-made structures and the like tend to be very regular and have very obvious parallel lines and vanishing points, this...
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