Perspective Projections vs Parallel Projections
|-||Parallel Projection||Perspective Projection|
|1.||In this projection, third z - co-ordinate is removed (3D to 2D) and parallel lines from vertex on the object are
extended until they intersect the viewing plane.
|Here projections are not parallel and they converge at a point (center or projection).|
|2.||Center of projection infinitely far from view plane like seeing through a telescope.||Center of projection finitely far from view plane|
|3.||Projectors will be parallel to each other (orthogonal)||Projectors will not be parallel to each other|
|4.||It requires the direction of projection (vector) be defined.||It requires first to define the location of the
center of projection (point).
|5.||Primarily, it is sub-divided into two types.
orthographic - direction of projection is normal to view plane
oblique - direction of projection not normal to view plane.
There are other sub-types like Cavalier projection and Cabinet projection
|It is classified into 1, 2, or 3-point perspective|
|6.||Suitable for drafting / CAD applications||It is more visually realistic and it has perspective foreshortening (objects further away appear
smaller i.e. relative proportions are not preserved.)