diff --git a/obj2d.rb b/obj2d.rb
index 84b0753..7b85f0b 100644
--- a/obj2d.rb
+++ b/obj2d.rb
@@ -1,7 +1,36 @@
 #!/usr/bin/env ruby
 
+require "erb"
+
+TEMPLATE = <<EOF
+int foo()
+{
+    return 42;
+}
+EOF
+
 def main(obj_fname, d_fname)
+  objects = {}
+  vertices = []
+  cur_obj = nil
+  File.read(obj_fname).each_line do |line|
+    if line =~ /^v\s+(\S+)\s+(\S+)/
+      vertices << [$1.to_f, $2.to_f]
+    elsif line =~ /^o\s+(..)-(\d+)/
+      obj_class, obj_class_index = $1, $2.to_i
+      objects[obj_class] ||= []
+      objects[obj_class][obj_class_index] ||= []
+      cur_obj = objects[obj_class][obj_class_index]
+    elsif line =~ /^o\s+(.*)/
+      raise "Do not know how to handle object #{$1.inspect}"
+    elsif line =~ /^f\s+(\d+)\s+(\d+)\s+(\d+)/
+      cur_obj << [$1, $2, $3].map(&:to_i)
+    elsif line =~ /^l\s+(\d+)\s+(\d+)/
+      cur_obj << [$1, $2].map(&:to_i)
+    end
+  end
   File.open(d_fname, "w") do |fh|
+    fh.puts ERB.new(TEMPLATE, nil, "<>").result
   end
 end