Photon mapping with physically based quantum BRDFs would be "realistic-looking 100% CGI." Because you'd be doing an exact physics-based simulation of electromag

Photon mapping with physically based quantum BRDFs would be "realistic-looking 100% CGI." Because you'd be doing an exact physics-based simulation of electromagnetic light interacting with physically accurate materials. There's no way in hell you'd be able to do it real-time with models of sufficient detail though. So I presume you mean "... in realtime."