466ba37d$1@news.povray.org...
> Well it must be the rigth way but do not understand how to use it.
> I do not find "clear" example. It is a picture to show what I want to do 
> but not example of code.

maybe a  drawing by hand :-)

Marc

If you want an accurate simulation, POV ins not the good way.
But if you accept to fake it, there are solutions
If I understand you put a LED behind a transparent/filtering piece of 
plastic.

Marc

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