class IRB::RubyModel

def init_ruby_model
  cap_vertices    = (0..5).map {|i| Vec.new(*Complex.polar(1,  i        * Math::PI / 3).rect, 1) }
  middle_vertices = (0..5).map {|i| Vec.new(*Complex.polar(2, (i + 0.5) * Math::PI / 3).rect, 0) }
  bottom_vertex   = Vec.new(0, 0, -2)
  faces = [cap_vertices]
  6.times do |j|
    i = j-1
    faces << [cap_vertices[i], middle_vertices[i], cap_vertices[j]]
    faces << [cap_vertices[j], middle_vertices[i], middle_vertices[j]]
    faces << [middle_vertices[i], bottom_vertex, middle_vertices[j]]
  end
  faces
end