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.

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