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Weak perspective projection is an approximation of the perspective projection. In fact, it is a scaled orthographic projection: first, the object is projected onto the image plane by a set of parallel rays orthogonal to the plane; second, the image of the object is scaled. This approximation works if the object is close to the optical axis of the camera or its dimensions are small relative to the distance from the camera.

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Q: The difference between perspective projection and weak perspective projection?
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