Am 18.08.2020 um 19:46 schrieb Alain Martel:

> 
>> Thank you both for your suggestions. May be the addition of an other 
>> media may cure the problem but I had a lot of difficulties to adjust 
>> the media as they are so far and will not risk to disturb them by 
>> another one. The other approach proposed by Thomas is the use of a 
>> texture_map to the lake similiar to the construction of my sky_sphere. 
>> Fortunatelly air has no ripples or waves and is more predictable as 
>> water. May be I must have more patience in modellng a filtering disc 
>> with a proper scaled hole
>>
>> disc {





>> }
>>
>> Best regards
>> Michael
>>
> 
> When working with disc, don't forget that they have an interior that is 
> not limited to the visible part.
> Whenever you have media, you need to add hollow to any disc in the scene.
> 
> This :
> disc{0 y 10}
> have the same interior as this :
> plane{y 0}
Many thanks,
yes I tested the approach with the disk without the media. I added the 
media later.

Best regards
Michael

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