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Sequential mesh format (Specification)

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[section [title Section - triangles] [id smft.sections.triangles]]

[subsection [title Definition] [id smft.sections.triangles.def]]
[paragraph]
The [term [type command] triangles] section specifies triangle data that will
appear in the model.

[formal-item [title "triangles"] [id smft.data.triangles.def]]
[verbatim [include "smft-triangles.ebnf"]]

[paragraph]
The command takes no arguments.

[paragraph]
In a file that is specified to contain [term [type variable] k] triangles,
the next [term [type variable] k] non-empty, non-commented lines will contain
exactly [term [type constant] 3] whitespace-separated unsigned integer values
each representing the index of a vertex. Implementations MUST raise errors if
there are not exactly [term [type variable] k] triangles specified before
section's [link [target smft.sections.end] end] command.