Contents

require 'mittsu/core'
require 'mittsu/math'
require 'mittsu/extras/geometries/polyhedron_geometry'

module Mittsu
  class DodecahedronGeometry < PolyhedronGeometry
    def initialize(radius = 1.0, detail = 0)
      t = (1.0 + ::Math.sqrt(5.0)) / 2.0
      r = 1.0 / t

      vertices = [
        # (±1, ±1, ±1)
        -1, -1, -1,    -1, -1,  1,
        -1,  1, -1,    -1,  1,  1,
        1, -1, -1,     1, -1,  1,
        1,  1, -1,     1,  1,  1,

        # (0, ±1/φ, ±φ)
        0, -r, -t,     0, -r,  t,
        0,  r, -t,     0,  r,  t,

        # (±1/φ, ±φ, 0)
        -r, -t,  0,    -r,  t,  0,
        r, -t,  0,     r,  t,  0,

        # (±φ, 0, ±1/φ)
        -t,  0, -r,     t,  0, -r,
        -t,  0,  r,     t,  0,  r
      ]

      indices = [
        3, 11,  7,      3,  7, 15,      3, 15, 13,
        7, 19, 17,      7, 17,  6,      7,  6, 15,
        17,  4,  8,     17,  8, 10,     17, 10,  6,
        8,  0, 16,      8, 16,  2,      8,  2, 10,
        0, 12,  1,      0,  1, 18,      0, 18, 16,
        6, 10,  2,      6,  2, 13,      6, 13, 15,
        2, 16, 18,      2, 18,  3,      2,  3, 13,
        18,  1,  9,     18,  9, 11,     18, 11,  3,
        4, 14, 12,      4, 12,  0,      4,  0,  8,
        11,  9,  5,     11,  5, 19,     11, 19,  7,
        19,  5, 14,     19, 14,  4,     19,  4, 17,
        1, 12, 14,      1, 14,  5,      1,  5,  9
      ]

      super(vertices, indices, radius, detail)

      @type = 'DodecahedronGeometry'

      @parameters = {
        radius: radius,
        detail: detail
      }
    end
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
mittsu-0.5.0	lib/mittsu/extras/geometries/dodecahedron_geometry.rb
mittsu-0.4.1	lib/mittsu/extras/geometries/dodecahedron_geometry.rb
mittsu-0.4.0	lib/mittsu/extras/geometries/dodecahedron_geometry.rb
mittsu-0.3.3	lib/mittsu/extras/geometries/dodecahedron_geometry.rb