.vol files
- First line: <# of tetrahedra>
- Remaining lines list of # of maximum volumes:
<tetrahedron #> <maximum volume>
...
A .vol file associates with each tetrahedron a maximum volume which is used for mesh refinement. It is read by TetGen in case the -r switch is used.
As with other file formats, every tetrahedron must be represented, and they must be numbered consecutively. A tetrahedron may be left unconstrained by assigning it a negative maximum volume.