First Angle Projection

First-angle projection is the ISO standard and is used mostly in Europe and Asia. If we imagine projecting a 3D object into a transparent plastic cube, the main object surfaces are projected onto the cube's walls so that the top view is placed under the front view and the right view is placed at the left of the front view, a two-dimensional representation of the object is formed by "unfolding" the box and viewing all of the interior walls as is shown in Figure 5.7A.

Orthographic Base Views
Figure 5.3 An illustration of an object showing the six principal views in orthographic projection based on third-angle projection.
True Shapes Auxiliary Elevations
Figure 5.4 An elevation of a window drawn in an orthographic format retaining its true size, shape, and proportion and showing no distortion or foreshortening.
Figure 5.5A Design drawing plan of an office space drawn to a scale of 1/4 inch = 1 foot, 0 inches. Notice that there are no dimensions as would be found in a typical orthographic working drawing.

In first-angle projection, the object lies above and before the viewing planes; the planes are opaque; and each view is pushed through the object onto the plane furthest from it. Extending to the six-sided box, each view of the object is projected in the direction of sight of the object onto the interior walls of the box; that is, each view of the object is drawn on the opposite side of the box.

Figure 5.5B Counter detail drawing to a scale of 1:2 than the % inches = 1 foot, 0 inches drawing.

This drawing is to a greater scale and has more detail

Bild Dimensionen

PROJECTION

Figure 5.6 A multiview projection for a simple house. This is the format most used by architects and engineers.

PROJECTION

Figure 5.6 A multiview projection for a simple house. This is the format most used by architects and engineers.

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