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Is it ya lamp you create ?
Did you try to put it into another model with other Cinerender parameters ?
Are you able to open this lamp to check its GDL script ?
Christophe - FRANCE Archicad Designer and Teacher Archicad 15 to 27 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2017 - 16Go RAM "Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin
Had some extra time today.
Tried the lamp object with AC22 - it worked ok, a lightened up interior was rendered by cinerender.
Tried it with AC 23 - that resulted a black interior render, just like yours.
I certainly am not sure about the cause, but it seems like a lamp bug or a render engine bug.
AC25, Rhino6/7+Grasshopper, TwinMotion • Mac Pro 6,1 E5-1650v2-3,5GHz/128GB/eGPU:6800XT/11.6.5 • HP Z4/Xeon W-2195/256GB/RX6800XT/W10ProWS
Tried at home, and it works with AC 23 now too. (Yesterday I was at work.)
I don't know what is the difference between my setups causing this. I've got AC 23 Mac, 3003 INT Full in both my macs.
I tried different settings a little bit, and got some peculiarities to show up though.
AC25, Rhino6/7+Grasshopper, TwinMotion • Mac Pro 6,1 E5-1650v2-3,5GHz/128GB/eGPU:6800XT/11.6.5 • HP Z4/Xeon W-2195/256GB/RX6800XT/W10ProWS