I've added four progressively optimized implementations of the Haskell ray tracer to the language comparison: http://www.ffconsultancy.com/languages/ray_tracer/ Only the first is lazy and I haven't mentioned them in the discussion yet. -- Dr Jon D Harrop, Flying Frog Consultancy Ltd. OCaml for Scientists http://www.ffconsultancy.com/products/ocaml_for_scientists/?e