الجمعة، 22 مارس 2013

How to draw Orthographic or Multiview Drawing

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
 
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
 
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
 
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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