St. <dot### [at] dotcom> wrote:
>       So, method 1 is recognised by PoV-Ray but not method 3.

  Methods 1 and 2 are two different sampling algorithms. There's no
method 3.

> It still 
> leaves the question of what method 1 is good for compared to +a0.0?

  There's nothing to compare. The +a and the +am options are two different
parameters of antialiasing (the fact that both start with "+a" is a mere
question of syntax). The option +a turns on antialiasing calculations, and
it can take a threshold value as parameter. The +am option specifies the
algorithm to use for antialiasing (1 being the default when this option
is not given).

  The threshold given to +a means how much adjacent pixels must differ
before antialiasing samples are taken. The antialiasing method simply
tells how those samples are taken. They are basically different and
independent settings.

-- 
                                                          - Warp

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