POV-Ray : Newsgroups : povray.binaries.images : Radiosity and reflective glass : Radiosity and reflective glass Server Time
16 Sep 2021 15:35:08 EDT (-0400)
  Radiosity and reflective glass  
From: Chris R
Date: 14 Sep 2021 10:00:00
Message: <web.6140aa84617d30b28b0d9fdd5cc1b6e@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.

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.


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