Writing a <#395#><#2190#>rayshade<#2190#><#395#> input file is principally a matter of defining a special aggregate object, the World object, which is a list of the objects in the scene. When writing a <#396#><#2192#>rayshade<#2192#><#396#> input file, all objects that are instantiated outside of object-definition blocks are added to the World object; you need not (nor should you) define the World object explicitly in the input file.