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namespace Geometry
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namespace Geometry
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{
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{
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	/** A ThreeDDDA is a class for traversing a grid of cells. We wish to
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	/** \brief A ThreeDDDA is a class for traversing a grid of cells.
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      We wish to
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			enumerate all cells pierced by the ray going from a point p0 to a
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			enumerate all cells pierced by the ray going from a point p0 to a
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			point p1. It is dangerous to use floating point arithmetic since rounding
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			point p1. It is dangerous to use floating point arithmetic since rounding
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			errors may accumulate entailing that the 3ddda misses the cell containing
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			errors may accumulate entailing that the 3ddda misses the cell containing
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			the end point of the ray.
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			the end point of the ray.
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