POV-Ray: Newsgroups: povray.pov4.discussion.general: Suggest v4.0 allow negative phong / spectral values. (yuqk): Re: Suggest v4.0 allow negative phong / spectral values. (yuqk)

POV-Ray : Newsgroups : povray.pov4.discussion.general : Suggest v4.0 allow negative phong / spectral values. (yuqk) : Re: Suggest v4.0 allow negative phong / spectral values. (yuqk)		Server Time 18 Feb 2026 05:47:37 EST (-0500)

From: Cousin Ricky
Date: 14 Feb 2026 13:45:00
Message: <web.6990c19f5168fad560e0cc3d949c357d@news.povray.org>

William F Pokorny <ano### [at] anonymousorg> wrote:
> An old (~2021) yuqk change for which I could not find a prior newsgroup
> post 'description', allows negative phong and spectral values.
>
> We have always been able to use the finish{} block phong and specular
> features together for effects in an additive-color way. The yuqk fork
> allows negative phong/spectral values too. For example:
>
> [snip]

I'm confused.  By "spectral," do you mean "specular"?

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