Cousin Ricky wrote:
> For example, it would be useful to have a texture apply optionally to a
> portion of a union:
> 
> #macro Neat_object (Param1, Param2, Texture)
>    union
>    {  object { ... }
>       object
>       {  ...
>          #if ( /* Texture is really a texture and not the float value 0 */ )
>             texture { Texture }
>          #end
>       }
>    }
> #end

You could use the following workaround:

#macro Neat_object (Param1, Param2, Texture, UseTexture)
  union
    {  object { ... }
       object
       {  ...
       #if (UseTexture)
         texture { Texture }
       #end
     }
  }
#end

Neat_object(Foo, Bar, MightBeATexture, defined(MightBeATexture)


HTH,
Florian

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