I always get this muddy dirty horizon with vray sun/sky.
Any workaround in order to get a nice clean blue sky?
Thanks!
Have you tried the Turbidity parameter?
As Bobby said, in the VRaySun’s setting, right click on the spinner next to “Turbidity” to set it to it’s lowest level, 2.0
Lower values makes cleaner and “blue-er” while higher values makes more dirty and "red-er or “orangy”
A bit further down, if you also set the sky model to “CIE Clear”, it will be a little better also.
Now, if you want to go all out, then you can set turbidity to lower than 2.0, although I must warn you, too low together with a low sun may give pink/purplish results. That being said, a value of 1.0 sometimes work well. You can make it even 0.1
so open up the maxscript lister window and while you have your sun selected, stick this in the listener:
$.turbidity=0.1
The VRaySun settings in the panel will still display 2.0, but if you render, you will see that 0.1 did actually change it.
Maybe 1 or 1.5 will work well for your needs?
Thanks guys.
Yes, I did try the turbidity thing.
But in my opinion it lacks saturation when I do that.
See the photo below. This is a standard photo with, probably, no photoshop. The sky has that glowing blue that I can’t seem to get with vray sky.
Is it just me?
Do you use an output to control the sky or do you think it’s crazy?
I can clearly see this sky had some photoshopping done.
If you’re using LWF and all your values are realistic, then the sky will be as it should.
If all else fails, just stick a gradient ramp in your environment slot
I typically use CIE Clear and the turn the horiz illumination way down to get the sky deeper and darker. I do find it almost impossible to get the vraysky to be as deep, blue, saturated as I want…
iv never been able to get that sydney / greek islands blue from a vray sky tbh
thats what photoshop is for
This is what using HDRis are good for.
You can always make your own HDR sky map of a deep dark blue sky which I have done in the past for a specific “look”
horiz illum @ 10,000 and white balance at like 4000. Sky will look good, but the scene wont 
Well to be fair, you usually have to use a polarizing filter to get perfect blue skies in photos. Maybe a polarizing filter in the Physical Camera could be an idea? Has a pretty dramatic effect on reflections too.
I never really had any issue having sky really blue with Vray skies.
here is a quick setup done in 2min.
Default settings everywhere beside :
Sun Turbidity : 2
Sun Ozone : 1
Sun/Sky have to be linked though, with the sky in a domelight.
If you’d like to change the sun tint, a quick white balance will do the trick.
If you’d like to have it more saturated though, a quick “color correction” node between the sky and the domelight and it does the trick IMO.
In this example, I boosted the sat +30 :
Hope this help.
Stan
Could you render the same image but without blocking the horizon and using a normal lens like 30 or 40mm? thanks.
One of the interns here is looking into implementing some additional sky models that are supposed to be more accurate. Not sure if they are any bluer though. I will post some comparison images when I have them.
Best regards,
Vlado
The vray users in our office get pretty jealous at how flexible the skytracer system in Lightwave is. And how they can get super dark deep blue skies. Damn them.
Cool beans, cant wait to see them!!
Great!
This is just an idea, but you know how you can create your own IES files? It could be cool to create your own vray sky models. May be with a standalone tool?
Vray sky works much faster than HDRI and they give the overall look to the image, like the latter.
