Hi DrKnow,
you could e.g. try this melscript from the author behind the G.I.Joe script... -->
https://www.pixho.com
click on the "toolbox"... select "mel scripts" an go down to where it says... "subSurfIllum shader mel script" to download it...
here is also a bit more info about it.... -->
https://www.3dluvr.com/pixho/toolbox/...lum_shader.htm
regards
Strarup
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Alex V. U. Strarup
One mistake can ruin it all...