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Qualitative invisibility
In CAD/CAM, Quantitative Invisibility (QI) is the number of solid bodies obscuring a point in space as projected onto a plane (called [vector] hidden line removal used by the Vector format). Often, when a CAD engineer creates a projection of his model into a plane [the drawing], he wishes to denote the edges which are visible by a solid segment and those which are hidden by dashed or dimmed segments.
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