Computer GraphicsTU Board 2081
Differentiate between parallel projection and perspective projections.
5Answer
| Parallel projection | Perspective projection |
|---|---|
| Projection lines (projectors) are parallel to each other. | Projectors converge at a single point, the centre of projection (the viewer's eye). |
| The centre of projection is at infinity. | The centre of projection is at a finite distance. |
| The size of an object does not change with its distance from the viewer. | Objects further away look smaller (foreshortening). |
| Parallel lines stay parallel. | Parallel lines not parallel to the view plane meet at vanishing points. |
| Keeps true shape and relative proportions, so measurements can be taken from the drawing. | Looks realistic, as the eye or a camera sees it, but distances cannot be measured directly. |
| Types: orthographic (front, top and side views, isometric) and oblique (cavalier, cabinet). | Types: one-point, two-point and three-point perspective. |
| Used in engineering and architectural drawings and CAD. | Used in games, animation, architectural walkthroughs and art. |
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