Orthographic projection is a form of parallel projection in which all the projection lines are orthogonal to the projection plane, resulting in every plane of the scene appearing in affine transformation on the viewing surface.
Если прямая перпендикулярна плоскости, то на эпюре: горизонтальная проекции прямой перпендикулярна горизонтальной проекции горизонтали плоскости, а фронтальная проекция прямой перпендикулярна фронтальной проекции фронтали.
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