Thank You Serzz (and Ben), I appreciate the answer & info. Nuke and AE are probably the most popular I've heard of for the post production work. I'm guessing you're using Final Gather, GI, and Caustics? Have you ever used Importons & Irradiance Particles? (I get the impression a lot of people may 'skip' over Importons and Irradiance Particles, -to test out Iray ).
Thanks again, and I'm curious to find out what thing it is you want to correct :-) . Awesome work!
@Ben.. definitely I should try with BOF... thx for reminding me
@joshpurple I used FG and tried to use Caustic... Acctually the Caustic is the thing that I would like to repair.
Sometimes I use GI and sometimes FG... it is good to know both way (and baybe even blend them together)...