Interior designers and architects often use three-dimensional drawings when presenting a concept to their client. Along with a plan and elevations, a 3D drawing helps the client to easily visualize the proposed design. It describes an object; room or building that is drawn in a manner that allows the eye to interpret it as a real element. A three-dimensional (3D) drawing shows the three values, length, width and height. Perspective projection is a type of projection where three dimensional objects are not projected along parallel lines, but along lines emerging from a single point. This has the effect that distant objects appearing smaller than nearer objects. It also means that lines which are parallel in nature appear to intersect in the projected image, for example if railways are pictured with perspective projection, they appear to converge towards a single point, called vanishing point. Photographic lenses and the human eye work in the same way, therefore perspective projection looks most realistic. Perspective projection is usually categorized into one-point, two-point and three-point perspective, depending on the orientation of the projection plane towards the axes of the depicted object.
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