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Comments: 9
jesuis

28.03.2024, 14:23








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Canyon with IBL
Canyon with IBL

            

Canyon with IBL
Description: Another of Horo's hdr's - the rather strange "ncc-day-mediancut.hdr" which provides a fairly even dome of light. Here to get the shadows more or less in the same position as in the previous Canyon image I rotated and pitched the scene, something you can perhaps detect from the corruption of the terrain material and the angle of the sky perspective. Personally, I do not like this image as much as the previous one, but the hdr does add something to the bryce render that was lacking and so out of interest alone and for the purpose of showing off Horo's fine hdr generating skills, I submit this image for your contemplation. Render time was 4 hours and thirty minutes at 30 quality. Intensity and Effect were both set to 100 so I guess this hdr is possibly bordering on the dim side?
Added by: davidbrinnen
Keywords: davidbrinnen, bryce6, IBL, horo, hdr, canyon
Date: 11.20.2006 00:28
Hits: 4053
Downloads: 130
Rating: 4.50 (2 Vote(s))
File size: 235.3 KB
Previous image: Yet more light
Next image: On a pedestal



Author: Comment:
rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610
comparison

I agree totally with what you wrote above. Horo provides great .hdri's and it's good to know someone like him who can increase the available number of .hdri's out there.

The original is much better. This scene demonstrates a situation where IBL is not always the best solution or most realistic. Secondary lights have their own way of correcting what you want corrected while leaving the rest alone. It's interesting that this time the .hdri took color satruation away, instead of providing more saturation.

Another reason the default sun needs to be brighter is to enable bryce to make it's own .hdri, as the higher f-stops are not possible now without a softare program to do it. In theory, each scene should have it's own unique .hdri, made for that scene and that scene only. Horo knows this and has developed his own .hdri's. Maybe he could teach the rest of us. It may be too technical to desribe, but a tutorial might be useful.
11.20.2006 00:49 Offline rashadcarter1 rashadcarter1 at aol.com
Horo
Admin

Join Date: 05.26.2004
Comments: 4721
-

Thanks for trying that one. I think I can see the white-yellow and the blue. Of course, the last version of this rocky desert is much better. Perhaps this one is a bit too bright. Considering the clouds, it could be a bit more subdued. It's an experiment and it helps us all when these experiments are shown here.

Rashad - I'm currently experimenting with the light probe creation. Photographic ones ain't as easy as everybody lets you believe. Creating them out of Bryce is a very random endavour. It may also have to do with the current implementation of the IBL feature in B6.0 or my exaggerated expectations. The first preliminary tut I've prepared is probably another week's work down the drain. I have trash cans full of WONA theories (works once, never again). Before I embark on another tut try on that subject, I'll go about yours. It looks as if the theories behind that one are more reliable.
11.20.2006 01:32 Offline Horo h.-r.h.wernli at bluewin.ch https://www.horo.ch/
davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224
-

Aye, no problem... the blue is evident in the shadow region on the right at the base of the large rock - mostly though it is swamped by light from above - which is how I ended up pitching the whole scene to exaggerate the shadows. I think the strong sunlight was integral to the way this scene works, however, without trying things out you never know. This hdr alone could probably do very well for things like overcast summer days, however, I suspect that overcast summer days are not very frequent render subjects. Though with lower intensity settings this could be used in conjunction with an additional sun to provide convincing ambient light. Another more flexible option occurs to me, two scenes, one with strong sun and nothing else and one (of the same scene) with IBL - then mix the two in a paint package to the desired level. Of course the two concepts could be conbined in bryce - as I have been doing with the previous sunlight and IBL images, but getting the levels right is rather a fidly process and once you have set them in a single scene there is little room to manouvre in post if you need to tweek things.
11.20.2006 09:11 Offline davidbrinnen mail at davidbrinnen.co.uk http://www.davidbrinnen.com
rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610
post

You're absolutely right David in your observations about postwork. With lighting schemes as well thought out as these, post work usually takes away from the quality. There's no need to fix what's already what nature would likely have intended. Of course it won't ever be perfect, but it will be closer to real than fake. It will be more believable than fantastic. It just goes to show what processing does to real photos. It ruins them too. I have always been a color counter, in that psp7 has a counter and I'm always curious about how I can extract as many unique colors as possible out of the image. This way I feel I am keeping ever single pixel busy, getting the maximum quality and detail.

Saturation enhancements, contrast enhancements, gamma and all of that lower the number of unique colors in the image, even though it's been "enhanced." After one has slaved to produce those pixel sized details in bryce they will not easily part with them in post production. Nor will they need to. The images look great as are and it is a credit to yout lighting skill that the postwork does obvious detriment instead of concealing errors as most "enhancements" do. We enhance images to make them "more perfect." This does not make them more real. The only enhancement filter that actually increases color count is the sharpness increase filter. That boosts your colors but also makes it harder to compress the image. Many of my images must be uploaded a bit on the small side because the unique color count is so high.
11.20.2006 09:48 Offline rashadcarter1 rashadcarter1 at aol.com
tina gazcon
Member

Join Date: 08.07.2006
Comments: 254
It's Great!

Your use with sandstone is impressive. It looks so much like the Grand Canyon. Have you ever been? I have years ago, and you have really captured it in your work.
11.24.2006 22:33 Offline tina gazcon pecasg62 at hotmail.com
davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224
Thank you.

No I've never been to the Grand Canyon, nor am I even sure where it is... exactly... somewhere in the US. I worked from images, mostly of Bryce Canyon - from which I picked many of the colours and copied some of the structure - somewhat. The interent is a great resource for getting hold of reference images, I use Google images, pick out something I like the look of and work from that.
11.26.2006 21:09 Offline davidbrinnen mail at davidbrinnen.co.uk http://www.davidbrinnen.com


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