How do Textures work?

Developers Ruby API
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4

Who is responsible for maintenance of ruby.sketchup.com ? I found some error in the code.

Request to correct this:

uv_helper = face.get_UVHelper true, true, my_texture_writer
face.outer_loop.vertices.each do |vert|
  uvq = uv_help.get_back_UVQ(vert.position)
  puts "u=" + uvq.x.to_s + " v=" + uvq.y.to_s
end

uv_help was not defined.

Also could be useful to add page about get_UVHelper method. As there is no writing about it.