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polymerge(1gv) [debian man page]

POLYMERGE(1gv)															    POLYMERGE(1gv)

NAME
polymerge - merge coincident vertices, collinear edges, coplanar faces in an OOGL OFF object SYNOPSIS
polymerge [-v vertex_thresh] [-e edge_thresh] [-f face_thresh] [-V] [-E] [-F] [-d] [-b] [inputfile.off] DESCRIPTION
Polymerge eliminates redundancies from polyhedral objects in OOGL's OFF format, and writes another OFF object to its standard output. (Optionally it can produce instead an input file for Brakke's Evolver.) Specifically, it combines nearly-coincident vertices, nearly- collinear edges, and nearly-coplanar faces. Vertices which aren't used on any face are deleted, as are faces with less than three ver- tices. Thresholds for approximate equality are adjustable from the command line. Options are: -v vertex_thresh Merge vertices when they're closer than vertex_thresh apart; the default is .00001. -V Don't attempt to merge vertices. -e edge_thresh Merge edges where |sin(vertex_angle)| < edge_thresh; the default is When edges are merged, the corresponding vertex is removed. -E Don't attempt to merge edges. (4OFF edges are never merged.) -f face_thresh Merge faces sharing an edge where the faces are nearly coplanar: when |sin(angle_between_face_normal_vectors)| < face_thresh. The default is .03, or about two degrees. Note that merging can create faces which are concave polygons. -F Don't attempt to merge faces. (4OFF faces are never merged.) -b Produce an output file in .fe format for Brakke's Surface Evolver, instead of a new OFF file. -d Include debugging information as comments in the new OFF object. The comments indicate which vertices and faces in the original object correspond to which in the new one. Messages include: # Vtx nnn->mmm Merged vertices nnn and mmm (both indices in the original object). # Merged face nnn into mmm (vertices vvv www) n1.n2 s Faces nnn and mmm in the original object were merged; their common edge joined original vertices vvv and www. The cosine of the angle between the face normals was s. vertex coordinates # newvertno [order] # oldvertno Each vertex written appears with its new index, its order (number of edges touching that vertex), and its old index (index of a cor- responding vertex in the original object). face description # oldvertno ... For each new face, with N vertices after reduction, the comment indicates N corresponding vertices in the original object. AUTHOR
Stuart Levy, Geometry Center, University of Minnesota SEE ALSO
anytooff(1), offconsol(1) BUGS
Coplanar faces are merged even if they were assigned different colors. Should be able to handle binary OFF objects, but this hasn't been tested. Geometry Center 25 July 1993 POLYMERGE(1gv)

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gts2oogl(1)						  GNU Triangulated Surface utils					       gts2oogl(1)

NAME
gts2oogl - converts a GTS file to OOGL file format (Geomview). SYNOPSIS
gts2oogl [OPTIONS] < input.srf > output.oogl DESCRIPTION
This manual page documents briefly the gts2oogl command. OPTIONS
This program follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. -G, --gnuplot Writes isolines in gnuplot format. --component Color faces according to the component they belong too. --quality Color faces according to their quality. --area Color faces according to their area. --incomp Color incompatible faces. -f VAL, --fold=VAL Color faces which make an angle smaller than VAL degrees with any of their neighbors. -t, --faces Output individual faces. --epv Color vertices according to number of edges per vertex. -H C, --height=C Color vertices according to their C coordinate. -g, --gaussian Color vertices according to Gaussian curvature. -C, --curvature Color vertices according to mean curvature. --boundary Output boundary edges. -e A, --feature=A Output `feature' edges defined by angle A. --non-manifold Output non-manifold edges. --duplicate Output duplicate edges. -i N, --isolines=N Draw N isolines (levels of constant altitude). -I L, --isolines=L Draw isoline at level L. --cmap=FILE Load FILE as colormap. -m VAL, --min=VAL Use VAL as minimum scaling value. -M VAL, --max=VAL Use VAL as maximum scaling value. -r, --reverse Reverse colormap. -n, --nosurface Do not output surface. -F C, --flatten=C Set C coordinate to average value. -v, --verbose Display surface statistics. -h, --help Display the help and exit. AUTHOR
gts2oogl was written by Stephane Pipinet <popinet@users.sourceforge.net>. This manual page was written by Ruben Molina <rmolina@udea.edu.co>, for the Debian project (but may be used by others). June 2, 2008 gts2oogl(1)
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