3D Wireframe

main.rb

def tick(args)
  unless args.state.model
    args.state.model = Object3D.new('data/lowpoly_teapot.off')
    args.state.model.fast_3x3_transform!(rotate3D(0.2, 0.0, 0.0))
    args.state.spin_mtx = rotate3D(0.00, 0.00, 0.01)
    args.outputs.static_lines << args.state.model.edges
  end
  args.state.model.fast_3x3_transform!(args.state.spin_mtx)
end

def mtx_dot(a, b)
  js = (0...b[0].length)
  ks = (0...b.length)
  (0...a.length).map do |i|
    js.map do |j|
      sum = 0
      ks.each { |k| sum += a[i][k] * b[k][j] }
      sum
    end
  end
end

def rotate3D(theta_x = 0.1, theta_y = 0.1, theta_z = 0.1)
  c_x, s_x = Math.cos(theta_x), Math.sin(theta_x)
  c_y, s_y = Math.cos(theta_y), Math.sin(theta_y)
  c_z, s_z = Math.cos(theta_z), Math.sin(theta_z)
  rot_x    = [[1, 0, 0], [0, c_x, -s_x], [0, s_x, c_x]]
  rot_y    = [[c_y, 0, s_y], [0, 1, 0], [-s_y, 0, c_y]]
  rot_z    = [[c_z, -s_z, 0], [s_z, c_z, 0], [0, 0, 1]]
  mtx_dot(mtx_dot(rot_x, rot_y), rot_z)
end

class Vertex
  attr_accessor :x, :y, :z
  attr_accessor :id

  def initialize(data, id)
    @x  = data[0].to_f
    @y  = data[1].to_f
    @z  = data[2].to_f
    @id = id
  end

  def fast_3x3_transform!(mtx)
    @x, @y, @z = mtx[0][0] * @x + mtx[0][1] * @y + mtx[0][2] * @z, mtx[1][0] * @x + mtx[1][1] * @y + mtx[1][2] * @z, mtx[2][0] * @x + mtx[2][1] * @y + mtx[2][2] * @z
  end

  def col_vector
    [@x, @y, @z].transpose
  end

  def set_col_vector(col)
    @x = col[0][0]
    @y = col[1][0]
    @z = col[2][0]
  end
end

class Face
  attr_reader :verts, :edges

  def initialize(data, verts)
    vert_count = data[0].to_i
    vert_ids   = data[1, vert_count].map(&:to_i)
    @verts     = vert_ids.map { |i| verts[i] }
    @edges     = (0...vert_count).map { |i| Edge.new(verts[vert_ids[i - 1]], verts[vert_ids[i]]) }.rotate(1)
  end
end

class Edge
  attr_accessor :a, :r, :g, :b
  attr_reader :point_a, :point_b

  def initialize(point_a, point_b)
    @point_a, @point_b = point_a, point_b
    @a                 = 255
    @r                 = @g = @b = 0
  end

  def sorted
    @point_a.id < @point_b.id ? self : Edge.new(@point_b, @point_a)
  end

  def x
    @point_a.x * 300 + 640
  end

  def y
    @point_a.z * 300 + 360
  end

  def x2
    @point_b.x * 300 + 640
  end

  def y2
    @point_b.z * 300 + 360
  end

  def primitive_marker
    :line
  end
end

class Object3D
  attr_reader :vert_count, :face_count, :edge_count, :verts, :faces, :edges

  def initialize(path = 'data/lowpoly_teapot.off')
    @vert_count = @face_count = @edge_count = 0
    @verts      = []
    @faces      = []
    @edges      = []
    _init_from_file(path)
  end

  def _init_from_file(path)
    file_lines = $gtk.read_file(path).split("\n")
                     .reject { |line| line.start_with?('#') || line.split(' ').length == 0 } # Strip out simple comments and blank lines
                     .map { |line| line.split('#')[0] } # Strip out end of line comments
                     .map { |line| line.split(' ') } # Tokenize by splitting on whitespace
    raise "OFF file did not start with OFF." if file_lines.shift != ["OFF"]
    raise "<NVertices NFaces NEdges> line malformed" if file_lines[0].length != 3
    @vert_count, @face_count, @edge_count = file_lines.shift&.map(&:to_i)
    raise "Incorrect number of vertices and/or faces (Parsed VFE header: #{@vert_count} #{@face_count} #{@edge_count})" if file_lines.length != @vert_count + @face_count
    vert_lines = file_lines[0, @vert_count]
    face_lines = file_lines[@vert_count, @face_count]
    @verts     = vert_lines.map_with_index { |line, id| Vertex.new(line, id) }
    @faces     = face_lines.map { |line| Face.new(line, @verts) }
    @edges     = @faces.flat_map(&:edges).uniq do |edge|
      sorted = edge.sorted
      [sorted.point_a, sorted.point_b]
    end
  end

  def fast_3x3_transform!(mtx)
    @verts.each { |vert| vert.fast_3x3_transform!(mtx) }
  end
end

zzz_lowpoly_teapot.off

OFF
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7 9 0 1 4 7 6 14

NOTE: I renamed lowpoly_teapot.off to zzz_lowpoly_teapot.off so the code would show at the top of the gist.
The code assumes there's a file called lowpoly_teapot.off in the data directory.