POV-Ray : Newsgroups : povray.binaries.images : Radiosity and reflective glass : Re: Radiosity and reflective glass Server Time
18 Oct 2021 12:21:18 EDT (-0400)
  Re: Radiosity and reflective glass  
From: Alain Martel
Date: 14 Sep 2021 11:59:00
Message: <6140c6c4$1@news.povray.org>

> I have been working on a scene modeling the bar and glassware cabinet in the
> corner of my living room.  When testing the addition of new elements to this
> scene I render it at various anti-alias levels with radiosity turned off, and
> I'm pretty happy with it.
> When I turn radiosity on (using Rad_Settings(Radiosity_IndoorLQ, off, off)), I
> get all of these extra highlight spots on the curtains, the rug, and the frames
> around the window.  I verified that if I leave the glasses out of the cabinet,
> those highlights disappear, so I'm pretty sure it has something to do with the
> reflective glass surfaces interacting with radiosity.
> The problem is that I'm not sure how to fix this.  The typical finish on the
> glassware is something like this:
>          finish {
>              specular albedo 0.05
>              roughness 0.0005
>              reflection {
>                  0.1
>                  fresnel
>              }
>              conserve_energy
>          }
> and the interior:
>      interior {
>          ior 1.6
>          caustics 1.0
>          fade_distance 2*Hurricane_glass_base_radius
>          fade_power 1001
>      }
> There is a sun-based light-source outside of the room, but it is positioned such
> that it is probably not adding any highlights to the scene.  The lamp on the bar
> itself is very low power, but does have an emission value in the finish of the
> lampshade.  The main light source is a cluster of 4 bulbs, each modeled as a 2x2
> area light behind, above, and to the left of the camera.

Should be at least 5x5, preferably 9x9, with adaptive 0.

> Any thoughts on what I am doing wrong that is causing these to appear?  No
> matter how bright a light I add to the actual room, I do not see these
> highlights on the curtains or the rug.
> Thanks,
> -- Chris R.

I often see similar highlights IRL. So, they look natural.

Whenever you have reflective or refractive surfaces in a radiosity 
scene, they act the same way photons do : Cause highlights and caustics. 
The mechanism causing them is different, but the end result can be similar.

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