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Usage: off_normals [options] [input_file]
Display normals of faces, implicit edges, and vertices
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
-n <opts> plot element normals
n - raw normals (default), u - unit normals
o - set all outward, i - set all inward
r - reverse both inward and outward
e - connect normal to element centroid
d - delete faces of eliminated normals
D - delete all of original model
-t <opts> normal type
n - positional, p - perpendicular to element (default: n)
-i <elms> show pointing. The element string can include o, i and h
to show, respectively, outward, inward and hemispherical
note: exlusion occurs before o, i, r of -n (default: oih)
-s <elms> show elements. The element string can include v, e and f
to show, respectively, vertices, edges and faces (default: f)
-p <opts> average pattern string for edge and vertex normals. Done before -n
r - raw, o - outward, i - inward, u - unit (default: r)
-C <xyz> center of model, in form 'X,Y,Z' (default: centroid)
-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)
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
-E <col> normal vector color. connected to element centroid
default: color of normal vertex
-B <col> normal vector base color. color at element centroid
key word: b take color of element (default)
key word: n take color of normal vertex
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