Imagine that you have an object suspended by transparent threads inside a glass box, as
in figure 3.
| Figure 3 - The block suspended in a glass box |
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Then draw the object on each of three faces as seen from that direction. Unfold the box
(figure 4) and you have the three views. We call this an "orthographic" or
"multiview" drawing.
| Figure 4 - The creation of an orthographic multiview drawing |
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Figure 5 shows how the three views appear on a piece of paper after unfolding the box.
| Figure 5 - A multiview drawing and its explanation |
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Which views should one choose for a multiview drawing? The views that reveal every
detail about the object. Three views are not always necessary; we need only as many views
as are required to describe the object fully. For example, some objects need only two
views, while others need four. The circular object in figure 6 requires only two views.
| Figure 6 - An object needing only two orthogonal views |
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