In article <39092043.AF6883F7@pacbell.net>, lin### [at] povrayorg 
wrote:

> I don't see why. Once the instructions are parsed the operation
> would be performed at the program level.

No, the macro would have to be parsed at least once for every pixel. 
Without completely redoing the parser, it can't be parsed once and 
executed multiple times. This could be quite slow, and I have no idea 
how it would be implemented. Isosurface functions would be a lot faster, 
and could do nearly everything a macro could do.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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