hi Willi ... some tips
... it doesn't work with direct render mode (Q) you must render to file
... use low values to RGB in model's properties
... z-buffer lights
thanks for the hints.
yes that was the failure. always tested with the region render. render to file works fine. but itīs a bit tricky to find out the right rgb values for the sss colours.
but it should also work with the region render tool for tweaking the right sss values.
z-buffer lights with shadows gave me strange shadow artefacts, only raytraced shadows work fine with sss.