vpoltoadj - converts a polygon file to an adjacency file

vpoltoadj if=infile of=outfile [-i] [-p] [-v] [-dbug]

Vpoltoadj converts a 3D polygon file to a 3D adjacency file using a hash table. This program hashes adjacent vertices from the input polygon file into a direct-access table using a hash table for fast lookups and then outputs adjacencies to an adjaceny list file. The input polygon file is a list of 3D polygons with a VixX type of VX_V3D. Each 3D n-sided polygon is composed of n+1 3D vertices with the last vertex as a repetition of the first vertex to denote polygon closure. The output adjacency file is a list of an index, a 3D vertex, and an adjacency list with VisX types VX_VID, VX_V3D, and VX_ADJ, respectively. If -p option is on, the output file is virtual-polygon type which consists of vertex list and adjacency list. The output created with -p flag can be used with vvptovtk.

if=

polygon file with each polygon of the format: VX_V3D [size=3(n+1)] polygon where n is the number sides of the polygon

of=

adjacency list file with the file format: VX_VID (0xDA) [size=1] vertex index VX_V3D [size=3] vertex VX_ADJ (0XD7) [size=n] adjacency list where n is the number of adjacencies

-i

output polygon rather than adjacency list.

-p

inhibits packing of result

-v

verbose mode prints number of polygons, n-sided polygons, vertices, and adjacency information

-dbug

prints hash table and direct-access table

B.C.Lee, 1999, H.Bae, J.Lee, 2006

vvertopol(1), vvertoadj(1), vpoltover(1), vadjtover(1), vadjtopol(1), vvptovtk(1)