Parallel ProjectionsIntroductionA view of an object is known technically as a projection.Projection is done,in theory, by extending lines of sight called projectors or visual rays from theeye of the observer or station point (SP) through lines and points on theobject to the plane of projection (PP). Projectors that appear to converge at avanishing point (VP) are called perspective projections and are used intechnical sketching. Projectors that remain parallel to the object andperpendicular to the picture plane are called parallel projectionsand are usedin technical drawing and drafting applications.ParallelprojectionsParallel projections are projections where visual rays remain parallel to theobject. Regardless of the relative positions of the object, the plane ofprojection, and the distance from the observer, parallel projections of objectshave the same dimensions as the objects. Parallel projections may be furtherclassified into oblique and orthographic projections.Figure 6-1 shows the classification of major projections.Figure 6-1.—Projections.6-3
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