iso_delta - isohedral deltahedra

Usage

Usage: iso_delta [options] polyhedron

Make Isohedral Deltahedra in OFF format. The polyhedron may be specified
by its list number, or the (start of the) name of the polyhedron.
Additional examples can be generated using -d or -c parameters.
Based on a paper by G. C. Shephard
Periodica Mathematica Hungarica, Volume 39, Numbers 1-3, 2000 , pp. 83-106(24).
with enhancements by Jim McNeill (http://www.orchidpalms.com/polyhedra)
and Adrian Rossiter (http://www.antiprism.com)

Options
  -h,--help this help message (run 'off_util -H help' for general help)
  --version version information
  -L        display the list of Isohedral Deltahedra 1 thru 44
  -t        generate triangle only (Isohedral Deltahedra 1 to 44 and option -d)
  -v        verbose output (Isohedral Deltahedra 1 thru 44 and option -d)
  -o <file> write output to file (default: write to standard output)

Isohedral Deltahedra Options
  -a <ang>  angle (-c c,d,g,h,i,j,k)
  -n <n/d>  n/d (d is optional) (-c a,c,g,h,k,l and -d)
              note: for option -d and compound cases c, k, l:
              n and d must be such that (6/5 <= n/d <= 6)
  -k <int>  in special cases, for number of constituents (-c a,c,g,h,k,l)
  -s <int>  in special cases, for subtypes (default: 1) (-c b,e,f,m,o)

Isohedral Deltahedra Special Cases
  -d        dipyramid of n/d using -n n/d (infinite set) where 6/5 <= n/d <= 6
  -c <type> compound cases (a thru f from Shephard's paper)
              a - tetrahedron repeated k times, evenly spaced
                     when k=1 tetrahedron, when k=2 Stella Octangula
                     Uniform Compound Set UC22 when n/d is 2/1 and angle 0
              b - 5 or 10 tetrahedra
                     s=1 icosahedral, s=2 with horizontal reflection
                     Uniform Compounds UC05 and UC06
              c - 2 dipyramids of n/d using -a angle (default: calculated)
                     relaxed dual of Uniform Compound Set UC20 and k=1
              d - 6 octahedra using -a angle (default: 22.5)
                     At 45.0 degrees is 3 Octahedra
                     dual of Uniform Compound Set UC07
              e - 4 or 8 triangular dipyramids
                     s=1 octahedral, s=2 with horizontal reflection
                     relaxed duals of Uniform Compounds UC30 & UC31
              f - 6 or 12 5/1 pentagonal or 5/2 star dipyramids
                     5/1: s=1 icosahedral, s=2 with horizontal reflection
                          relaxed duals of Uniform Compounds UC34 & UC35
                     5/2: s=3 icosahedral, s=4 with horizontal reflection
                          relaxed duals of Uniform Compounds UC36 & UC37
            additional cases:
              g - 2 tetrahedra using -a angle (default: 45.0)
                     At 45.0 degrees is Uniform Compound UC04
                     Uniform Compound Set UC22 when n/d is 2/1 and k=1
              h - 2 tetrahedra repeated k times, evenly spaced
                     using -a angle (default: 1.0)
                     Uniform Compound Set UC22 when n/d is 2/1 for any k
              i - 6 tetrahedra using -a angle (default: 45.0)
                     Uniform Compound UC01. At 45.0 degrees is UC03
              j - 12 tetrahedra using -a angle (default: 30.0)
                     Uniform Compound UC02. At 45.0 degrees is UC03
              k - 2 dipyramids of n/d repeated k times, evenly spaced
                     using -a angle (default: 1.0)
                     relaxed dual of Uniform Compound Set UC20
              l - k dipyramids of n/d using -n n/d, evenly spaced
                     relaxed dual of Uniform Compound Set UC21
              m - 10 or 20 triangular dipyramids
                     s=1 icosahedral, s=2 with horizontal reflection
                     relaxed duals of Uniform Compounds UC32 & UC33
              n - 6 10/3 star dipyramids
                     relaxed dual of Uniform Compounds UC41
              o - 5 or 10 Augmented Tetrahedra T2(1)
                     s=1 icosahedral, s=2 with horizontal reflection
                     relaxed duals of Uniform Compounds UC55 & UC56
              p - 5 Augmented Octahedra O6(1)
                     relaxed dual of Uniform Compounds UC57
              q - 5 Excavated Octahedra O6(2)
                     relaxed dual of Uniform Compounds UC58

Coloring Options (run 'off_util -H color' for help on color formats)
keyword: none - sets no color
  -F <col>  color the faces according to: (default: k)
              a color value - apply to all faces
              k - sets of faces connected by face edges (compounds)
              s - symmetric coloring [,sub_group,conj_type]
  -E <col>  color the edges according to: (default: f)
              a color value - apply to all edges
              f - color with average adjacent face color
              s - symmetric coloring [,sub_group,conj_type]
  -V <col>  color the vertices according to: (default: e)
              a color value - apply to all vertices
              e - color with average adjacent edge color
              f - color with average adjacent face color
              s - symmetric coloring [,sub_group,conj_type]
  -T <t,e>  transparency. from 0 (invisible) to 255 (opaque). element is any
            or all of, v - vertices, e - edges, f - faces, a - all (default: f)
  -m <maps> a comma separated list of color maps used to transform color
            indexes (default: compound), a part consisting of letters from
            v, e, f, selects the element types to apply the map list to
            (default 'vef'). use map name of 'index' to output index numbers

Examples

iso_delta 9 | antiview

iso_delta -c k -n 5/2 -k 2 -a 3 | antiview

Notes

It is based on a paper by G. C. Shephard Periodica Mathematica Hungarica, Volume 39, Numbers 1-3, 2000 , pp. 83-106(24) with enhancements by Jim McNeill and Adrian Rossiter.

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