to archive a different gamma curve for the visible sky you can simply use colorcorrect with the vraysky map as max environment.
use the original sky in the vray GI environment override slot.
Same problem, a bit more elaborated:
http://www.chaosgroup.com/forums/vbulletin/showthread.php?t=41947
This is what vraysky looks like to people who are not in the LWF sect:
But after they transcend through extensive use of mystical and magical gamma curves, the followers of LWF change their perception, and this becomes the One, the only, the True Vraysky. Blinded by their faith in sRGB space, they now deny the sheer existance of the previous instance, the lesser deity, the gamma uncorrected vray sky, which now has a dark, unholy and oversaturated aura around it.
Color correct does not work, it totally messes it up.
But after they transcend through extensive use of mystical and magical gamma curves, the followers of LWF change their perception, and this becomes the One, the only, the True Vraysky. Blinded by their faith in sRGB space, they now deny the sheer existance of the previous instance, the lesser deity, the gamma uncorrected vray sky, which now has a dark, unholy and oversaturated aura around it. LOL! love these LWF convs
But sRGB and Vraysky with gamma correction makes sense:
Vlado:
The color transformation that V-Ray uses for the physical sun and sky and for the VRayIES lights is closest to CIE RGB color space. When you add gamma correction, this becomes close (although not exactly the same as) sRGB color space.
Pailhead is absolutely correct with his results. The Vraysky becomes extremely dark when using LWF with exteriors if followed properly.
I am still waiting for some confirmation from Vlado regarding the use of LWF on exteriors and how to go about resolving this.
I believe this issue lies more with the actual gradient maps the Vraysky software employs.
Actually in his post he is stating the opposite, that a vray-sky would look too washed out when using LWF.
Some more discussion about this and some test-examples in this thread:
http://www.chaosgroup.com/forums/vbulletin/showthread.php?t=41947
i disagree!
from my experience it tends to look just a notch unsaturated imo…
My mistake. I need to reread his posting.
i think there are some misleading interpretations floating around and setting up ur materials correctly(er) has a major influence in all the workflow since the exposure of the camera itself will influence the sky!
Yea, there are a ton of misinterpretations of LWF.
Man someone should really post a comprehensive FAQ sticky.
Here is an interesting thread about gamma correction going on at cgtalk:
http://forums.cgsociety.org/showthread.php?f=6&t=628997&page=1&pp=50
I solve this problem by overriding environment sky with vray environment.
That way I control illumination with vray’s one (which is linked to sun) and background with the max’s one to my own liking. I’m not an accuracy freak so if it looks good it’s good enough for me.
Zoran