Am 14.04.2018 um 21:37 schrieb clipka:
> Yum.
> Looks crispy.
> 
Many thanks, hope it is a little bit more crispy now...

Here my final image with SSS at the tiles implemented. It was a lot of 
guess work since I did not really understand the central parameter of 
translucency. The docs are a little bit silent about this parameter and 
the sample source gives very high values. So I had to play a little bit. 
But learning is no waiste of time;)

First I observed strange artefacts at the white tiles around the black 
ones: Irregular thin black lines. Since they turned blue as I made a 
test with a blue colored version of the round tiles, I played around 
with the reflection parameters, but without any success. Then I came up 
with the strange idea to use UberPov instead of POV 3.7: the artefacts 
(and some radiosity artefacts under the "`cookie"' as well - can be seen 
at my first post here) disappeared completely.

The remaining issue were the black tiles. I observed strange artefacts 
at the surface and no specular reflection. I played around with the 
parameters but got the best result by using a very dark grey finally 
(White*0.0001). The SSS feature seems to call for some - even very small 
- amount of colour and seems to run into problems by specifying no 
colour (black) as the pigment.

Rendering time extended to 2 h 51 m 39 s at the same machine.

I have no other ideas what can be done with the floor so far.

Best regards
Michael

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