Yep. A "Ray Server" technique where PRMan farmed out calls trace() calls to BMRT was used in "A Bug's Life" for the glass bottles at the grasshopper's hideout.

Yep. A "Ray Server" technique where PRMan farmed out calls trace() calls to BMRT was used in "A Bug's Life" for the glass bottles at the grasshopper's hideout. All other reflection and refraction were done using 'standard-issue' environment maps. Source: Apodaca,Gritz, Advanced Renderman -- MK 2000.