vraySKY and gamma correction

[pailhead]

Is it possible somehow to spare the vray sky map from gamma correction?

I've tried using color correct map on it, and cranking the gamma value to 2.2, but the result is very, very weird. I get an ultra bright sky, that's even brighter than the sun. It's not really something that I expected.

[DaForce]

Well generally the sky is a background so you can tick or untick affect background in your color mapping preferences. That should help.

Also in the newer builds a few problems with the skies brightness have been fixed as well.

[pailhead]

I don't think that color mapping is my problem, i think that the culprit is my gamma correction. The sky map definitely looks different when i change the gamma in max's preferences.

[DaForce]

Ahhh that gamma, thought you were talking about the gamma in color mapping.

Might help to watch lele's tut. alot of that sort of stuff is covered I believe.

But basically the sky is affected because its a map.

Probably for the time being use color correct and set the gamma to whatever suits you... till you get the sky the way you want. And when the new version is released all problems might well be solved.

[pailhead]

It's not working with color correct thingie, for some reason, the sky becomes waaay overbright, burning out the whole scene, becoming stronger than the sun and so on.

Most of all i would like to get more brightness and contrast in the sky map, maybe even stronger reflections. I think lele's script and the .255 or whatever it is, rule may be the thing i'm looking for, but i would still like a skymap that compensates for the gamma correction.

[pailhead]

Has anyone found a solution for this?

[ingo]

Put your sky in an output map and adjust the RGB Level to your liking



Regards
Ingo

[pailhead]

RGB Level and gamma are not the same thing. At least i thought so, i'll give it a shot nonetheless.

*edit*

Tried it, doesn't work.

[ingo]

There is something wrong then.....
you have some pics maybe???

try ISO100, Shutter speed 1000, f-number 4

[ene.xis]

yeah...please ilustrate this....
i change regularly rgb levels to match gamma setings here...

[DaForce]

You wont be able to match gamma 100% with just RGB changes usually. As gamma is a curve RGB levels are usually just a linear increase.. I *think*

But hey if it works...

[ene.xis]

ur probably right...but it gets the job done...not acurate!
nevertheless i d like to see how far from reality it is...

[sv]

pailhead - i know what your talking about.
i've found this as well.

The sky looks great in linear space, a little washed out when gamma corrected, but if you try and gamma correct the sky, the rendered lighting radically changes and just isn't right at all any more.

I haven't found a way around this yet, apart from to just do it in post.....

[pailhead]

But i guess it doesn't bother a lot of people so no one really wants to attend to this. I'll post some images so you can see what you are missing.

[^Lele^]

I guess it's down to workflow and needs, really.
I wouldn't be so clear-cut in saying it doesn't interest anyone, it's just most people found a way around, or thought it to be right, or used a different method, or just got along with the looks of it.