Exposing VRaySky properly...

[Fear-factoR]

In fact, the physical sky in RC3 is about twice as dark as it should be (the sun is ok though). This is corrected in newer builds, where very special care has been taken to ensure that the sun/sky/camera/lights behave correctly (well, at least as correctly as possible).

Best regards,
Vlado

ah, thanks Vlado,
I can take that in to account, I just have to make my own rule then
Will the orange coloration at the horizon be toned down in future versions? I've got the feeling that it becomes to dominant in the scenes as it gets closer to sundown and daybreak.
Another question, will the vray sun be made in to a sunlight system in a future version of vray? right now I'm linking to a MAX sunlight system, but the result deviates from real world situations.

[vlado]

In newer builds, you can select the VRaySun as a sun type from the Daylight system drop-down menu. This can automatically add a vraysky too.

Best regards,
Vlado

[Fear-factoR]

In newer builds, you can select the VRaySun as a sun type from the Daylight system drop-down menu. This can automatically add a vraysky too.

Best regards,
Vlado

great
But I'll keep my stable RC3 running for now

[studioDIM]

As for the sky, it has been tuned a bit in newer RCs.
I particularly love its (new) colours, but i'm not sure (this is definitely Vlado's call) it'll stay just like it is now.

Lele

[Fear-factoR]

I can imagine that the evening sky (or morning) would look different for the UK or for a country near the equator just because of the way the light travels through the atmosphere, that's why it would be great when the vraysun/sky are a real sunlight system and based on real world conditions.

[studioDIM]

That's the turbidity control you want to touch.
The sunlight system only decides the position of the sun over the horizon, it cannot know how much humidity, ozone or pollution there is in that location.

Lele

[base2studios]

Perhaps this will work for you....I was researching basic photography and came across a "Sunny 16" rule. Simply put, on an outdoor scene with a clear sunny sky, set your f-stop to 16. Then you shutter speed should be the inverse of your film ISO. It's worked well for my tests, but see how that works for you.

ME

sorry for bumping this thread but this is the only discussion talking about the sunny f/16 rule.
http://www.photomigrations.com/articles/0403200.htm
I've been playing around with the physical camera/sun/sky but when I apply the sunny f/16 rule I get very dark results.
At f/16, shut. Sp. 1/800, ISO 200 the result is underexposed, cranking up the gamma to 2.2 in color mapping and setting shut. Sp. to 1/100 gives reasonable results...
How did you get good results?
What am I doing wrong, or is the physical sky as physical correct as it should be?

the problem is that if you input the values as you say you have, you've inversed the shutter speed - because that 1/x has already been done for you. So....essentially, you set the f-stop to 16, then make both the ISO and SS values match.

see what that does for you
ME

[m_hinks]

In fact, the physical sky in RC3 is about twice as dark as it should be (the sun is ok though). This is corrected in newer builds, where very special care has been taken to ensure that the sun/sky/camera/lights behave correctly (well, at least as correctly as possible).

Would I be correct in thinking that for people still using RC3, could you put the Sky mat in to an output and change some figures to mke the sky x2 the power?

Cheers

[alexthg]

Would I be correct in thinking that for people still using RC3, could you put the Sky mat in to an output and change some figures to mke the sky x2 the power?

i usually set the vraysky to manual, and lower the vraysun multiplier to about half (or whatever you like).

[m_hinks]

sounds good, is it the sun multiplier on the sun or in the sky mat you half?

[Pixelab]

In fact, the physical sky in RC3 is about twice as dark as it should be (the sun is ok though). This is corrected in newer builds, where very special care has been taken to ensure that the sun/sky/camera/lights behave correctly (well, at least as correctly as possible).

Does it also mean that the sky used as GI environement override has to be multiplied by 2 ?

Does this issue aplly to RC2 also ? (yup, still using RC2 )

[alexthg]

sounds good, is it the sun multiplier on the sun or in the sky mat you half?

the sun multiplier on the vraysun

or you can keep the vraysun multiplier at 1, and raise the sun intensity multiplier at vraysky, whichever suits you.

[aaron-cds]

Will the orange coloration at the horizon be toned down in future versions? I've got the feeling that it becomes to dominant in the scenes as it gets closer to sundown and daybreak.

I recently discovered how to manipulate the color of the sunlight and sky by playing with the color of the white balance in the physical camera settings. Through a little experimentation, you can get the ambient tint and sky color exactly where you want it.