While there is considerable work yet too be do in optimizing the Rendering times in TG2 and much work has already been done in said area, would rendering times and memory foot print be reduced further by using the KD-Tree Algorithm or some variation there of?
There are precedents in the 3d industry with both Lightwave 3D and Brazil R/S using it for improved render times, I am unsure as of weather other industry leading software makes use of this but TG2 should if applicable! ;D
Regards to you.
Cyber-Angel
I think TG2 uses currently a bounding interval hierarchy which has a smaller memory footprint than kd-trees (and similar performance)