這個(gè)代碼實(shí)現(xiàn)不了，求幫助

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require 'sketchup.rb'
module PPP
def FFFFF
  # variables to control the maximum step height and depth
  max_step_height = 8
  max_step_depth = 12
  step_width = 36
  p1 = Geom::Point3d.new(0, 0, 0)
  p2 = Geom::Point3d.new(100, 0, 100)
h = (p2 - p1).z
  puts "height = #{h}"
  p3 = Geom::Point3d.new(p2.x, p2.y, p1.z)
  v2 = p3 - p1
  l = v2.length
  puts "length = #{l}"
n1 = (h / max_step_height).to_i
  puts "n1 = #{n1}"
  n2 = (l / max_step_depth).to_i
  puts "n2 = #{n2}"
  numSteps = [n1, n2].max
  puts "numSteps = #{numSteps}"
  v1 = Geom::Vector3d.new 0, 0, (h/numSteps)
  v2.length = l/numSteps
  v3 = v1 * v2
  v3.length = step_width
model = Sketchup.active_model
  entities = model.entities
edges = []
  model.start_operation "FFFFF"
  pt1 = p1
  for i in 1..numSteps
   # create the front of the step
   pt2 = pt1 + v1
   pt3 = pt2 + v3
   pt4 = pt1 + v3
   edges[0] = entities.add_line(pt1, pt2)
   edges[1] = entities.add_line(pt2, pt3)
   edges[2] = entities.add_line(pt3, pt4)
   edges[3] = entities.add_line(pt4, pt1)
   entities.add_face edges
   # now make the top
   pt1 = pt2
   pt4 = pt3
   pt2 = pt1 + v2
   pt3 = pt4 + v2
   edges[3] = edges[1]
   edges[0] = entities.add_line(pt1, pt2)
   edges[1] = entities.add_line(pt2, pt3)
   edges[2] = entities.add_line(pt3, pt4)
   entities.add_face edges
   # move to the next step
   pt1 = pt2
  end
  model.commit_operation
end
end
UI.menu("Draw").add_item("樓梯") {PPP.FFFFF}