>Some modifications spring to mind:
>1 - to require commas between all arguments at all times
>2 - make using a texture obligatory  (it may only contain a pigment, ok)

If you are going this far, may I suggest you go for making obligatorty
MATERIAL, even if you leave out the interior component

>3 - introduce separate #end statements:  for #if blocks (#endif), #while
>blocks (#endwhile), #switch (#endswitch) blocks, and so on
>4 - semicolons after all #define commands

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