Aaand it got personal again.
@rawalanche can you provide a download for the scene you used so we can do our own tests?
I’m all for cached GI - maybe it could be tackeled with the next big “Code Quest” after the trasition to 2.8 and the new Depsgraph have stabilized. Even if it’s just CPU supported at the beginning. Maybe Mitsubas code could serve as a reference.
Also VCM could be very helpfull for complex light situations - caustics, interiors etc. Renderman has a very good implementation of it.
It would probably fit better with the existing Cycles architecture since it’s just another Method of Path Tracing. But I know too little about the underlying Math to judge this.