hi,

clipka <ano### [at] anonymousorg> wrote:
> Am 07.01.2019 um 12:53 schrieb jr:
> > so why is the parameter a float, when (just) a boolean would seem to be a better
> > fit?  future expansion?
>
> No; I just think the parameter should be `polarity SIGN` rather than
> `positive_polarity BOOL`; but POV-Ray doesn't have a `SIGN` type, so I
> went for the next best thing, which is the sign of a `FLOAT`. So in a
> sense the "most official" syntax is `polarity +1` or `polarity -1`.
>
> Since this has the side effect that `polarity on` /will/ also inevitably
> work, I opted to make `polarity off` work as well (meaning `polarity 0`
> would have to act like `polarity -1`).

ah, thank you.


> Allowing for arbitrary magnitude was also pretty much a no-brainer,
> because it simplifies the implementation, while having the side effect
> that it is easier to use in cases where the polarity might be derived
> from some computed value.



regards, jr.

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