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Maximize Feature Coverage
Try to ensure that the entire set, or at least camera-visible image, is covered with trackable features, not just the lower part or center, for example. Any area of the image with no tracked features might be interpreted as having any kind of distortion whatsoever. Features should extend to the edges, especially if high-order distortion is likely. The shot will look fine during match- moving, but when you later redistort rendered images with linear geometry into those areas, they may suddenly exhibit waviness, or outright craziness. (See the section on Post-solve checks.)
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