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Parallel Projection
Perspective Projection
In parallel projection, coordinate positions are changed to the view plane along parallel lines.
In perspective projection, object positions are changed to the view plane along lines that converge to a point known as a projection reference point or center of projection.
Preserves the related proportions of objects.
Produce realistic vision but does not keep relative proportions.
It is used in drafting to produce scale drawings of 3Dobjects.
Projections of distant objects are lower than the projections of objects of the same size that are near to the projection plane.