This format is used to describe a set of points in three dimensions. The points include sets of connected boundary points, and unconnected interior points.
Files of this format are edited and/or created by the NODER program, and are used as input to the GRIDIT program.
The format is:
Line 1: total number of nodes in the file - an integer NTOT
Line 2: total number of boundaries in the file - an integer NBTOT
Line 3: Number of points in the first boundary - an integer NBTHIS
Lines 4 - 4+NBTHIS-1: x, y, z values for one point on current boundary
Lines 3 and 4... are repeated NBTOT times for the boundaries, and then one additional time for the unconnected interior points. The value of NBTHIS for the interior points may be zero.