Op 30/10/2021 om 23:48 schreef Kenneth:
> 
> A beautiful crystal, Thomas-- and with those VERY nice caustics.
> 
Thank you indeed Kenneth.

> Long ago, I rendered a "Merry Christmas" image (which I can't find,
> unfortunately), that had some objects made of translucent ice, with an ior. I
> wanted internal 'cracks' to show up inside the ice-- so IIRC I accomplished that
> as part of its 3-D texture, not as actual geometry. It looked decent enough to
> fool the eye. Something *kind of* like this pseudo-code example:
> 
> pigment{
>     gradient x
>     pigment_map{
>              [0.49 --ice color --]
>              [0.49 bumps (?)
>                   -- some scale ---
>                    pigment_map{
>                        [0.3 -- ice color --]
>                        [0.3 rgbt <1,1,1,.7] // translucent white
>                               }
>                    scale 50 // to scale down the size of the warp effect
>                    warp {turbulence .2}
>                    scale 1/50
>              ]
>              [0.51 same as 0.49]
>              [0.51 -- ice color --]
>                   }
>           }
> 
> The general idea is to have a very thin slice of translucent white (somewhat
> broken up) to appear inside the ice-- like a crack or fracture. Perhaps
> something similar might work for your crystal.
> 

That is an interesting possibility which I shall try. I'll be back! 
Thanks for this!

-- 
Thomas

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