POV-Ray : Newsgroups : povray.binaries.images : Moving indoors : Re: Moving indoors Server Time
18 Oct 2021 22:03:30 EDT (-0400)
  Re: Moving indoors  
From: clipka
Date: 6 Aug 2021 06:50:24
Message: <610d13f0$1@news.povray.org>
Am 05.08.2021 um 22:43 schrieb Chris R:

> The pool table is a bit too shiny, but I like the reflection of the store across
> the street.

It looks to me like you're not using `fresnel`.

You should. It's more realistic, and it should also mute the reflections 
on the wood we're seeing head-on, while at the same time preserving the 
reflections on the wood we're seeing at a shallow angle.

In real life, Fresnelian reflection applies not only to transparent 
materials, but also to opaque ones (except metals - or, more 
technically, non-dielectrics - which behave somewhat different). And 
yes, such opaque materials also have an index of refraction. If you're 
unsure about the applicable value, 1.5 works reasonably well for most 
situations. The IOR of most opaque materials lies somewhere between 1.4 
and 1.6.

The same goes for the pool balls, which also look unnatural to me now 
that I've spent more time looking at them. The reflections on them 
should also appear more muted where we're seeing the surface head-on, as 
opposed to at an angle.


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