This type of rendering is indicative of a lack of brightness or a calculation time that is too low
Try to unlock the Cinerender advanced setting to allow adjustment of physical rendering parameters
You can also check the glazing parameters (transmission, rebound, etc. ...)
Christophe - FRANCEArchicad 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