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An orthographic projection is a way of representing a 3D object by using several 2D views of the object. Orthographic drawings are also known as multiviews. The most commonly used views are top, front, and right side.
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: a plane that is intersected by imaginary lines drawn from the eye to every point on the object and that is therefore the plane on which the pictorial representation in perspective is formed.
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Primary view means a visual scene from a single fixed vantage point or location within the primary viewing location or area that is not significantly impaired by vegetation.
The secondary auxiliary view is a projection from the primary auxiliary view onto a plane perpendicular to the true length edges. In this view, the sides and bottom of the groove appear as edges, as if you are looking into the end of the groove
