Wings3d obj to Minetest block converter

class Block
  def initialize(name, coords)
    @name = name
    @x1, @y1, @z1 = coords[1]
    @x2, @y2, @z2 = coords[0]
  end

  def to_s
    "{ #{@x1}, #{@y1}, #{@z1}, #{@x2}, #{@y2}, #{@z2} }, -- #{@name}"
  end
end

name = nil
num = 0
coords = []

File.open(ARGV[0]).read.each_line do |line|

  if name
    if line =~ /^v ([-0-9.]+) ([-0-9.]+) ([-0-9.]+)/
      if num == 2 || num == 4
        coords << [$1, $2, $3]
      end

      if num == 4
        puts Block.new(name.strip, coords)
        name = nil
      end

      num += 1
    end
  end

  if line =~ /^o (.*)/
    name = $1
    num = 0
    coords = []
  end
end