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Hi, I just stumbled over this old tread and thought that I should try to make my point less brief by adding a practical example to show how the viewpoint, and angle of the view, affects the perspective in the final painting.
As you see, on the left illustration, the angle of view is about 75 degrees out of the full circle of 360 degrees. To project the correct drawing one would have to straiten out the curve before projecting the lines, but I cheated.
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