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Orthographic Drawing
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Definition
A drawing system that projects a three-dimensional object onto a two-dimensional plane without perspective distortion — all lines parallel to each other remain parallel in the drawing. Plans, sections, and elevations are all orthographic drawings. They allow accurate measurement directly from the drawing, which perspective drawings do not.
Example
A set of planning drawings for a new house typically consists of a site plan, floor plans, and elevations — all orthographic projections that, together, describe the building from every necessary viewpoint without distortion.