Orthographic projections

Trihedral Angle. Left side view always comes to the left of the front view.

Top view always comes over the Front view. The view is always in opposite direction to the observer. The point of perspective for the orthographic projection is at infinite distance.

In this way the following four systems are formed: 1. Therefore, clear pictures cannot be obtained. Main articles: Multiview projection and Axonometric projection Symbols used to define whether a multiview projection is either third-angle right or first-angle left.

Orthographic projections

The front view is taken on the frontal plane, and the top view is taken on the horizontal plane. The selection of view of required details should be made. Then a specific view is drawn through every plane. The view is always in opposite direction to the observer. In each, the appearances of views may be thought of as being projected onto planes that form a six-sided box around the object. Following rules should be followed while forming orthographic drawing. Main articles: Multiview projection and Axonometric projection Symbols used to define whether a multiview projection is either third-angle right or first-angle left. Dihedral Angle. Right side view always comes to the left at the front view. Although six different sides can be drawn, usually three views of a drawing give enough information to make a three-dimensional object. Fourth Angle System.

The selection of view of required details should be made. The front view shows the length and height of an object.

Download