| - |
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.) |
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