Эталонной плоскостью называют ту плоскость, у которой центр имеет нулевое осевое смещение, как глядя по горизонтали, так глядя и по вертикали, относительно взгляда смотрящего человека, а сама плоскость конструкции перпендикулярна взгляду наблюдателя. При этом нужно считать, что направление взгляда наблюдателя и направление его движения совпадают.

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