Outerra forum

Outerra Engine => Development screen shots and videos => Topic started by: cameni on July 28, 2011, 06:29:07 pm

Title: White balance
Post by: cameni on July 28, 2011, 06:29:07 pm: Blog about white balance (http://outerra.blogspot.com/2011/07/white-balance.html) has been posted.

(http://4.bp.blogspot.com/-UePt9eb9_L4/TjHU9NsWopI/AAAAAAAAAJw/rHyOh4N6Ves/s320/wb9.jpg) (http://outerra.blogspot.com/2011/07/white-balance.html)
Title: White balance
Post by: ZeosPantera on July 29, 2011, 05:29:16 am: Wow. Not sure what to say. White balance had to come in at some point but the before and after both look really good. Maybe a middle ground.

Are sunsets less colorful because of this?
Title: White balance
Post by: cameni on July 29, 2011, 06:13:07 am: Yes, the sunsets changed, they are more yellow with WB, but I'm sure that this part is not entirely right. During the sunsets the contribution of sun to the computation of WB is minimal, because the angle of sun rays is almost parallel with respect to the measuring surface. But as I think about it more, our brains aren't constrained to perceiving white on horizontal surfaces, and something has to be done about it.

It seems to be right up until the sun approaches the horizon, while the sky is still lighted well, but then it needs to be adjusted, maybe slowly suppressing the WB effect.

Also, the sun disc isn't right size, should get bigger and possibly deformed near the horizon as the optical depth rises.
Title: White balance
Post by: PeterBitt on July 29, 2011, 08:41:42 am: i always get so excited when i see new threads in the development sreenshot section!
these pics are awesome, whitebalance increases realism very much i think (especialy pic wb7 looks great with it).

damn i want to roam through that landscape NOW! ;)

but is the last pic "wb5" before or after whitebalance? i think that the sea is a lot to orange compared to the yellow sky and overall it reflects the sky color to much.
see on this pic http://www.vacationreview.com/wp-content/uploads/2008/06/cape-may1.jpg how little the sea is reflecting the orange color, its just that direct sun reflection thats pretty orange.
Title: White balance
Post by: cameni on July 29, 2011, 10:08:20 am: Yes, too orange. Looks as if the reflections used uncorrected light there. Will investigate :)
Title: White balance
Post by: ZeosPantera on July 30, 2011, 12:53:36 am: Quote from: cameni
Yes, the sunsets changed, they are more yellow with WB, but I'm sure that this part is not entirely right.

If you walked around with a white piece of paper all day and looked at it in different locals indoor and out and at different times of day it would change color to the eye in almost every instance. Noon on a sunny day, white. Sunset, orange. Florescent lights, green-ish. etc.

Tweak tweak away!
Title: White balance
Post by: cameni on July 30, 2011, 02:47:05 am: Instant color yes, but if you let it adapt, or if the lighting changes slowly .. the difference can be best seen on a digital camera without automatic WB correction.
Title: White balance
Post by: flightmaster on July 30, 2011, 12:51:23 pm: I have taken a look at the white balanced photos, and I have to say, they look much more photo-realistic... well, except for the sunsets. But, i would like to congratulate you on your already superb engine, and hope that you will release a demo soon (screw AMD's engineers :D :( :mad: ).
Title: White balance
Post by: C. Shawn Smith on July 30, 2011, 02:38:55 pm: Something I just noticed in the screenshot below: I can see ripples in the sand, as if from a high tide :D. I haven't noticed that in other screenshots.

(http://1.bp.blogspot.com/-TNcWjk1jZ9o/TjHPPJ-Hx4I/AAAAAAAAAJg/W03Ze-JAeFA/s1600/wb4.jpg)
Title: White balance
Post by: flightmaster on July 30, 2011, 03:03:03 pm: they've been holding out on us! :| :o
Title: White balance
Post by: cameni on July 30, 2011, 05:15:08 pm: Oh, it's out. Ripples in the sand. Next they'll find the footprints :O

You can see them pretty well also in the older underwater video (http://www.youtube.com/watch?v=6KhFBES0o0g). It's actually an artifact of the pseudo-random number generator that tends to produce it in certain conditions. I actually thought I had it fixed already, but no.

We'll make a feature out of it! :)
Title: White balance
Post by: flightmaster on July 30, 2011, 07:54:33 pm: looking at the underwater video again, i noticed that there were areas with overhangs, specifically at 0:22. I am wondering if you might be able to adapt that to cliffs, canyons and such.
Title: White balance
Post by: C. Shawn Smith on July 30, 2011, 10:23:55 pm: Quote from: cameni
Oh, it's out. Ripples in the sand. Next they'll find the footprints :O

You can see them pretty well also in the older underwater video (http://www.youtube.com/watch?v=6KhFBES0o0g). It's actually an artifact of the pseudo-random number generator that tends to produce it in certain conditions. I actually thought I had it fixed already, but no.

We'll make a feature out of it! :)

Sweet ... I just vaguely recall that now that you pointed it out. It does look very cool though.

And it will likewise be cool if you can actually reproduce high and low tides in the engine ;)
Title: White balance
Post by: cameni on July 31, 2011, 03:18:25 am: Quote from: flightmaster
looking at the underwater video again, i noticed that there were areas with overhangs, specifically at 0:22. I am wondering if you might be able to adapt that to cliffs, canyons and such.
You'll be able to find them anywhere where the terrain was steep enough. They are created by the horizontal displace effect (http://outerra.blogspot.com/search/label/horizontal%20displace).
Title: Re: White balance
Post by: Bartolomeus on September 29, 2011, 07:05:10 am: I like the pictures with the "white balance". This "theme" looks really great.

And of course, i love the underwater video. ;)