Rich Blue Skies

[Dave Buckley]

New to Vray anybody want to help me achieve nice blue skies, using the vray sun and sky or is there a better way to do it???

 

I am ok with using the sun and sky to provide lighting but in terms of colour my knowledge is limited.

 

i don't understand all these terms such as turbidity etc is that even a real word

[Three D]

http://www.spot3d.com/vray/help/150R1/ is my friend. it should be yours too.

[Claudio Branch]

 

is there a better way to do it?

 

 

It is extremely hard to beat a hi-res digital photo that you take yourself. A high-quality background image coupled with an appropriate HDR/V-Ray Dome light is very effective.

[BrianKitts]

even the best results that I get in the frame buffer I end up tweaking in post. Inverting your alpha channel selection is great for adjusting the vray sky...

[Dave Buckley]

how do you get your best results in the frame buffer

 

i will end up tweaking it without a doubt but i would still like to be able to get those nice skies in the frame buffer that i have seen before

 

what is your prefered method of lighting and exterior, at current i know of about 6 different ways

 

i am wanting to do an animation of a beach development so i think i'm going to have to take the approach of using a dome with sky mapped to it or is there a way of replacing skies in animation frames???

 

surely i can't use any other method other than dome if i want the animation to have the same realistic sky throughout.

 

also what program do you guys use for colour grading

 

i'm looking for a complete autodesk solution rather than switching between autodesk/adobe etc

[BrianKitts]

how do you get your best results in the frame buffer

 

for the bluest sky that you will get in the frame buffer put the vray sun high in the sky (noonish), and leave your turbidity and ozone at their lowest levels (2 and 0)

 

and LWF is a must to get a proper exposure with the vray sky. otherwise your results will be oversaturated and dark.

[Dave Buckley]

i use hsv exponential colour mapping with dark and light both set at 1 and the gamma set at 2.2, i also have sub pixel mapping enabled along with clamp output

 

i have the vray sun attached to a max daylight system with vray sun selected and the daylight system sky turned off, so will the daylight system affect the height aspect and therefore be limiting my blue colour???

 

i have vray sky in environment slot should i be using the manual sun node of the vray sky????

[diegofer_9]

with linear workflow I think is preferable to use linear exposure so that you get correct light values, but you have to set the gamma in max to 2.2 or 1.8. Here's a great link for doing that:

http://www.aversis.be/tutorials/vray/essential_gamma_01.htm

 

Other thatn that, getting a blue sky in my experience is about positioning your sun like Brian mentions.

[Derek Forreal]

i have the vray sun attached to a max daylight system with vray sun selected and the daylight system sky turned off, so will the daylight system affect the height aspect and therefore be limiting my blue colour???

 

yes it will. not in front of max now, but you need to go to the setup panel of the daylight system and adjust time of day/year, project north etc. as you make these changes you will see the position of the sun update in your viewports

[Dave Buckley]

sorry i didn't explain correctly, i know how the daylight system works, but does it matter how far i drag the daylight assembly head up into the air because with mental ray it doesn't really matter how high the actual assembly head is

[BrianKitts]

no, if you're referring to the orbital scale (distance between daylight head and target) it doesn't affect the vraysky. Most people refer the the vray sun controlling the sky by how "high" the sun is, but it's actually the angle, not the height.

 

I did a test in my generic exterior setup scene, the left side of the image the orbital scale is 100' the right side is 10,000' notice theres no noticable difference in the sky, but you can see a slight difference in the shadow density beneath the teapot due to the change in distance of the light head.

Edited August 7, 2008 by BrianKitts

[Dave Buckley]

perfect answer mr kitts, thank you

[kjverine]

no, if you're referring to the orbital scale (distance between daylight head and target) it doesn't affect the vraysky. Most people refer the the vray sun controlling the sky by how "high" the sun is, but it's actually the angle, not the height.

 

I did a test in my generic exterior setup scene, the left side of the image the orbital scale is 100' the right side is 10,000' notice theres no noticable difference in the sky, but you can see a slight difference in the shadow density beneath the teapot due to the change in distance of the light head.

 

Hi Brian, I was wonder if you wouldn't mind sharing that exterior setup scene that you have. If so is it configured for LWF? I have never been able to get my white to look so balanced the way you have it on the teapot.

[Dave Buckley]

and how did you get clouds in the sky???