Warp wrote:
>   This is because, if the #macro is indeed in an included file, POV-Ray will
> open that file, seek to the macro, parse it and close the file, and this each
> time the macro is called. Thus the overhead is about as bad as an explicit
> #include call.

Would it be possible for POV-Ray to hold all already-parsed files in a 
memory buffer, so it wouldn't have to open them multiple times?  I 
realize this might take a bit of work to deal with potential rewrites of 
the macro via the file I/O options, but it would be shedloads faster 
than the current method, I think.

...Chambers

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