- Imposes a maximum triangle area.
- If a number follows the `a', no triangle will be generated whose
area is larger than that number. For instance,
`-a2.5`specifies that no triangle should have area greater than 2.5. - If no number is specified after the `a', an .area file (if -r is used) or .poly file (if -r is not used) specifies a set of maximum area constraints.
- An .area file
contains a separate area constraint for
each triangle, and is useful for refining a finite element mesh
based on
*a posteriori*error estimates. - A .poly file can optionally contain an area constraint for each segment-bounded region, thereby controlling triangle densities in a first triangulation of a PSLG.
- You can impose both a fixed area constraint and a varying area constraint by invoking the -a switch twice, once with and once without a number following.

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jrs@cs.berkeley.edu