This figure illustrates the final state of
the example shown earlier. Here the "die" side is actually the punch,
since that is the shape against which we wish to measure closure.
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Note that the contour levels have been chosen explicitly, with unequal
intervals, to illustrate the following:
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The centre of the workpiece is fully in contact: green area, value
= 0.0.
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There is a zone of progressive opening roughly half way up the walls,
where a gap between workpiece and punch is opening up: yellow (0.01)
to red (0.5).
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The rest of the workpiece has a gap of 10mm or more (purple).
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All punch (ie the "die" side) nodes, for which no closure values
are calculated, are blue, having the value of -2.0.
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There is a small patch of "uncomputed" nodes (light blue, = -1.0)
at about 4 o'clock on the workpiece. The reasons for this are explained
later.
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