off_normals - utility for working with normals

Usage

Usage: off_normals [options] [input_file]

Display normals of faces, implicit edges, and vertices
If input_file is not given the program reads from standard input.

Options
  -h,--help this help message (run 'off_util -H help' for general help)
  --version version information
  -l <lim>  minimum distance for unique vertex locations as negative exponent
               (default: 12 giving 1e-12)
  -o <file> write output to file (default: write to standard output)

Scene Options
  -t        normal position. n - natural, a - add element centers (default: n)
  -u        unit normals
  -e        connect to element centroid (for reference)
  -p <opt>  force polarity. o - outward, i - inward
               r - reverse both inward and outward
  -i <elms> include normals. The element string can include o, i and h
               to show outward, inward and hemispherical
               note: exclusion occurs before -p (default: oih)
  -s <elms> include elements. The element string can include v, e and f
               to show vertices, edges and faces (default: f)
  -d <opt>  delete elements. f - delete faces of excluded normals
               a - delete all of original model
  -c <opts> average pattern string for edge and vertex normals. Done before -p
               r - raw, o - outward, i - inward, u - unit (default: r)
  -a        alternate calculation for vertex normals
  -x <opt>  face normals: n - Newell's, t - triangles, q - quads (default: n)
  -C <xyz>  center of model for normals, three comma separated coordinates
               0 for origin  (default: centroid)

Coloring Options (run 'off_util -H color' for help on color formats)
  -O <col>  outward normal vertex color
  -I <col>  inward normal vertex color
               default: vertex color is negative of outward col
  -H <col>  hemispherical normal vertex color  (default: gray50)
  -E <col>  normal vector color. connected to element centroid
               default: color of normal vertex
               keyword: r take random color
  -B <col>  normal vector base color. color at element centroid
               keyword: b take color of element (default)
               keyword: n take color of normal vertex

Examples

off_normals dod -O white | antiview -v 0.075

off_util -O n rt | off_normals -e -E r | antiview -v 0.075 -x f

off_normals icosidodecahedron -s e -O white -e | off_color -r A0.3,f | antiview -v 0.02

Notes

     Next: conv_hull - convex hulls (using Qhull)
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