Le 18-09-09 à 13:08, clipka a écrit :
> Am 09.09.2018 um 18:50 schrieb jr:
>> hi,
>>
>> clipka <ano### [at] anonymousorg> wrote:
>>> Am 08.09.2018 um 13:45 schrieb jr:
>>>> now I would like to find out how to increase the translucence of the rhomboids.
>>>
>>> Are you aiming for semi-transparency or diffuse translucency?
>>
>> translucent I guess.  I replaced (in BGimeno's code) the rgb colour returned
>> from  the CW_angle macro with a rgbt (with fixed .45 transmit, see image) but
>> that results in increased transparency.  the effect I'd like to achieve is more
>> like very, very thin mother-of-pearl.
> 
> Then - presuming your torus thingumajig is using non-solid geometry -
> you want backside diffuse illumination, and maybe one or two more levels
> of radiosity recursion.
> 
> To enable backside diffuse illumination, use the two-parameter version
> of `diffuse`:
> 
>      finish { diffuse FRONT,BACK }
> 
> where FRONT is how much light is reflected to the illuminated side, and
> BACK is how much light is transmittend to the other side. The sum should
> be smaller than than 1.0 for realistic materials.
> 

For mother-of-pearl, you also need a fair amount of iridescence. Maybe 
something in the 0.4 .. 0.6 range.

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