How to change blue sky

[kozzie]

I've got a question. I wanna change sky colour in my scene from blue to pure white. How can I do this and which settings should I change. I enclose 2 jpeg's links.
1. Blue sky I wanna change
2. My settings

http://www.imagehack.eu/uploads/705767f012.jpg
http://www.imagehack.eu/uploads/73fadc7b8a.jpg

[howardhong_cg]

Re: How to change blue sky

if you use physical camera

1.set shutter speed
2.set ISO value
3.F-number

n environment

4.GI--M---Common--Type--AColor
Multiplier---30000 or more--gotto press Update
(if you dont do this, cant see shadows)

5.Background--M--same as above

Caustics

6.Caustics--on

about physical camera, i like to set 100,300,11 n after render, ajust shutter speed and ISO..

good luck!

[howardhong_cg]

Re: How to change blue sky

one more,


environment

4.GI--box color--blue to white--M--Common--Type--Sky
Multiplier---1
Sun--check off Override Sun's parameter
Press update (if you dont do this, cant see shadows)

5.Background--same as above--except Mltiplier--about 10


very carefully choose Shutter speed,ISO,F-number...if you dont like result, change these values.

[Ibontxu]

Re: How to change blue sky

Hi, howardhong. I've read your post and i have some questions:

- When you reffer to "n environment" what do you mean?

- When you use "GI (Skylight) [Color Box] [Multiplier] M" or "Background [Color Box] [Multiplier] M" does have any effect on the render the color of the color box?

- When you say "after render, ajust shutter speed and ISO" you mean that we can do changes after rendering? can it be done any change after rendering that affects the render image? (something like post production inside Vray)

Thanks for your help!

[howardhong_cg]

Re: How to change blue sky



- When you reffer to "n environment" what do you mean?

"n ..." is mistyping


- When you use "GI (Skylight) [Color Box] [Multiplier] M" or "Background [Color Box] [Multiplier] M" does have any effect on the render the color of the color box?

yes. background's multiplier shows color intensity you need.
its very easy to check. render with very fast rendering settings.


- When you say "after render, ajust shutter speed and ISO" you mean that we can do changes after rendering? can it be done any change after rendering that affects the render image? (something like post production inside Vray)

after render, change settings n render again.
if you dont mind, check the frame buffer options after rendering.

thx.

[howardhong_cg]

Re: How to change blue sky

hi,


i have tested it again

1.use default camera


2.GI--M--Common--Type--AColor
Multiplier---1
(Press update)

3.Background--same as above

this setting shows all you want..

good luck.

[howardhong_cg]

Re: How to change blue sky

theres another setting

environment

4.GI--M--Common--Type--Sky
Multiplier---1
Sun--check off Override Sun's parameter
Press update (if you dont do this, cant see shadows)

5.Background--M--Common--Type--AColor
Multiplier---30000


use physical camera

its very nice.

[jenujacob]

Re: How to change blue sky

a million thanx howard!

[kwistenbiebel1]

Re: How to change blue sky

Thanks HowardHong,

Your exercise shows well which parameters can be tweaked to obtain different sky appearances.

It would be even more great if those settings were accompanied with rendered images to see the differences.


cheers,
Biebel

[dalomar_cg]

Re: How to change blue sky

Basically the whole sun/sky system works of several parameters, two of which are very important for changing the color/appearance. Those are turbidity and ozone.

Turbidity is the control of the amount of dust in the air. Basically more dust equal less of a blue appearance.
Turbidity--- 2=the bluest sky possible >8=more of a hazy/less blue sky

Ozone is the control for the color of the sun itself
Ozone--- 0=yellowish sunlight 1=bluish sunlight

Keep in mind that the appearance of the sky will change based on the position of the sun, so high noon in the middle of the summer will lead to very blue results. So try setting the sky a little lower in the sky itself to decrease the blue effect. You can adjust the resulting appearance of the shadows through shadow bias as that will pull the shadows towards or away from the object.

Lastly, If you have a map in any slot (GI, background, or any material settings) the color value that is next to it is not used at all...so if I have the sky mapped, my color could be purple and it won't matter.

[howardhong_cg]

Re: How to change blue sky

thk, dalomar
you are right.

i made a mistake

"color box" cant affect any effect to background.
i mean multiplier can adjust color intensity of background when used white or grey.

sorry, Ibontxu.
and thanks to all.