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> Am 22.11.2020 um 16:22 schrieb Kenneth:
>> Thomas de Groot <tho### [at] degroot org> wrote:
>>> In Norbert Kern's Bluebell Wood discussion, there was mention of the use
>>> of basckside illumination by Alain and myself. Here is an example of its
>>> use, a 2019 update of a 2012 scene from the Iskander/Gancaloon universe.
>>> Backside illumination was applied to the curtains.
>>>
>>> --
>>> Thomas
>>
>> I have not yet used backside illumination, so I'm curious as to what I
>> should
>> see in your scene. I assume that the curtain objects themselves are
>> semi-transparent(?), and that the effect is seen as the small
>> triangular light
>> patches on the left-side curtain?
>>
>> So many tricks to learn, so little time ;-)
>>
>>
>>
> As all I know, backside illumination and semi transparency is not the
> same. Semi transparency can be achieved by using an alpha-channel within
> a png-based texture. Backside illumination is a special calculation of
> diffuse reflections.
>
> I used
> in this image:
> at all of the balloons.
>
> As I understand it, it means that 55 % of the light from front
> lightsources is diffuse reflected and that 40 % of light from sources at
> the backside of an object can pass through.
>
> Best regards
> Michael
>
You understand correctly, with a little precision : The part that pass
through does it diffusely.
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