Ive <ive### [at] lilysoftorg> wrote:
>
> Well, it would have been helpful to *see* your full material statement
> but anyway for dielectrics like glass something like this has always
> worked for me:
>
>
> #macro Dielectric (COLOR, IOR, TRANSLUCENCY)
>    material {
>      texture {
>        pigment {rgb COLOR filter 1}
>        finish {
>          ambient 0  diffuse 0
>          reflection {0,1 fresnel on} conserve_energy
>        }
>      }
>      interior {
>        ior IOR
>        fade_power 1001
>        fade_distance TRANSLUCENCY
>        fade_color rgb <pow(COLOR.red,3),
>         pow(COLOR.green,3),
>         pow(COLOR.blue,3)>
>      }
>    }
> #end
>
>
> note that this "fade_power 1001" statement is an old (and really dirty
> as it lacks any logic) hack that is part of POV-Ray since ages to turn
> realistic fade power calculation on.
> The value for TRANSLUCENCY depends on your general scene scale and just
> to mention it: make sure your max_trace_level is high enough for all the
> internal bounces.
>
> -Ive

This is the full material statement I used for the bowl,
max_trace_level = 20 (I already know the trick with "fade_power 1001", thank you
anyway!):

    material {
        texture {
            pigment {color rgbf 1}
            finish {
                ambient 0
                diffuse 0
                reflection {1  fresnel}
                conserve_energy
            }
        }
        interior {
            ior 1.41
            fade_color color rgb <0, 0.15, 0.02>
            fade_power 1001
            fade_distance 1
        }
    }

It's almost similar to the one you posted, the only thing I did differently is
the pigment. I don't want really "colored" glass, rather clear glass like this
one: http://www.indigorenderer.com/materials/materials/1026

I did another render with reduced fade_distance so you can better see what
disturbs my eye..

Regards,

Florian

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