Perspective Projections vs Parallel Projections
Computer Graphics
Answer:
| - | 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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