Hi there,
I´m just playing with the RT Demo and I tried to use it as interactive exposure control.
But I noticed a significant difference in brigthness between the RT window and the final Rendering.
http://sorceress.netfrag.org/optix/VRayRT\_Exposure\_difference.jpg
I only used Vray Exposure Controls (Various Color Mapping Methods, Vray Physical Camera)
It happens with with nearly every GI engine (Irr. Map, Lightcache, Prog. Path Tracing)
the only exception ist Brute force, wich comes pretty close probabely because it has
a limited bounce rate. Also no gamma was changed within max or the Vray Frame Buffer
(I tried both Max default and Vray Frame Buffer).
VrayRT is always much darker.
I´m on Max2008/Vray1.5sp3a