r.RayTracing.GlobalIllumination.EnableTransmission
VarUnreal Engine Var console variable.
rRayTracingGlobalIlluminationEnableTransmission
Description
Enables transmission when tracing GI rays (default = 1)
Usage
r.RayTracing.GlobalIllumination.EnableTransmission [value]Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.

