There are many times when the interior details of an object cannot be seen from the
outside (figure 8).
| Figure 8 - An isometric drawing that does not show all details |
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We can get around this by pretending to cut the object on a plane and showing the
"sectional view". The sectional view is applicable to objects like engine
blocks, where the interior details are intricate and would be very difficult to understand
through the use of "hidden" lines (hidden lines are, by convention, dotted) on
an orthographic or isometric drawing.
Imagine slicing the object in the middle (figure 9):
| Figure 9 - "Sectioning" an object |
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| Figure 10 - Sectioning the object in figure 8 |
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Take away the front half (figure 10) and what you have is a full section view (figure
11).
| Figure 11 - Sectioned isometric and orthogonal views |
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The cross-section looks like figure 11 when it is viewed from straight ahead.
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