REQ - Sky model without the sun

CoolColJ · Post by **CoolColJ** » Thu Aug 09, 2007 9:58 am

Hey, it would be nice if you can get that nice modelled sky up for renders, but without the Sun shinig to do cloudy days for example

thanks

deltaepsylon · Post by **deltaepsylon** » Thu Aug 09, 2007 9:59 am

hmmmm.. or maybe a sun with (fractal) clouds model. fractals might work for generating them

Kram1032 · Post by **Kram1032** » Thu Aug 09, 2007 10:02 am

clouds are abadonned, for now:
too slow, says the master.

you could try a big SSS cube, aothe your scene - as long, as you don't quite see the sky, that should be a nice way to simulate it

CoolColJ · Post by **CoolColJ** » Thu Aug 09, 2007 10:13 am

yeah, but I want the sky and the blend of the horizon and upper atmosphere colours etc - otherwise I would just use a background colour or image, but that doesn't look the same

or have a brightness parameter for the Sun would do the trick without too much complication I gather. This way we can simulate different enviroments or other planets

A Vue 6 Astmosphere/Sky model would be even better

deltaepsylon · Post by **deltaepsylon** » Thu Aug 09, 2007 10:34 am

clouds shouldnt be THAT hard?

prob. cuz he was trying to do it a diferrent way.
My way ----> generte the shape in 2d, then map it onto EXR/HDRI (i get em confused too much) and then use that as a background. the most time consuming part of that would be the saving as an exr/hdri thingy.
but you would only need to generate fractals, and thats easy/quick in 2d

Post by **OnoSendai** » Thu Aug 09, 2007 10:42 am

I'm gonna do some more on clouds now that I have my Quad

Kram1032 · Post by **Kram1032** » Thu Aug 09, 2007 12:01 pm

great

So that didn't die

Can't wait, 'till I see your further development

CTZn · Post by **CTZn** » Fri Aug 10, 2007 1:22 am

I'm gonna do some more on clouds now that I have my Quad

Oh great !

CoolColJ, you can raise turbidity, up to 8 say some people, but why not try an higher value ? It should create an overcasted sky impression.

Kram1032 · Post by **Kram1032** » Fri Aug 10, 2007 1:29 am

very high values (20) give a greenish sky - at least with the standard skymodel. Looks very strange.

CTZn · Post by **CTZn** » Fri Aug 10, 2007 1:34 am

ah ok, never tryed that, hehe. Mmmh, yellow sun + blue sky... yeah I suppose turbidity must be some gaussian blur...

Kram1032 · Post by **Kram1032** » Fri Aug 10, 2007 1:42 am

nope xD

very low values (1.5 and lower) give a black sky, where the sun is white, very high values give greenish skys, where the sun is white, too

Dunno, the exact "correct" range, but tinman posted, somewhere, that minimum for correct values = 1.8 or something like this, and maximum = 6...

lower and higher values will give incorrect results - not shure, if these are correct, or if they're exactly, what tinman wrote...

CTZn · Post by **CTZn** » Fri Aug 10, 2007 2:09 am

Tinman must be right... and my supposition was stupid

manitwo · Post by **manitwo** » Fri Aug 10, 2007 2:26 am

if sundir is "0 0 0" the sun is gone - only the sky remains.

deltaepsylon · Post by **deltaepsylon** » Fri Aug 10, 2007 3:32 am

i think ono made the sky model based on his true home planet, based on the weird colors

nice to see that i kinda revived the clouds idea

now we can really kick fryrender's ass

Kram1032 · Post by **Kram1032** » Fri Aug 10, 2007 7:42 am

deltaepsylon wrote:i think ono made the sky model based on his true home planet, based on the weird colors

it's based on papers, and it's supposed, to have those bugs.

deltaepsylon wrote: nice to see that i kinda revived the clouds idea

you didn't, he did himself, or better, his 4core did it xD

REQ - Sky model without the sun

REQ - Sky model without the sun

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