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Room as camera obscura using Octane Render by pnn32 Room as camera obscura using Octane Render by pnn32
This is mostly 'proof-of-concept' / 'technology demo' image, rather than completed artwork :) But it can be interesting for someone because of:
 Bullet; Green  Demonstration of possibilities of unbiased render engine - the small hole in wall works exactly as it should IRL, projecting environment light to room's interior, while turning it upside down.
 Bullet; Green  Nice artistic effect of room turned into 'camera obscura', can be featured in various scenes
 Bullet; Green  It's the good challenge for other (unbiased) render engines.. let's hope it's also possible to render in iRay or some other ones

Unfortunately, the render process requires just incredible amount of computing power and the first appropriate image appears only after noticeable amount of time. So... to render full scene (with characters, for example) in appropriate time and low noise, you will need a rig with several GTX Titan at least :faint:

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Bullet; Blue More links on theme:

Artistic works
thecreativediary.blogspot.com/…

Detailed (real-world) tutorial with explanations and tips
content.photojojo.com/diy/diy-…

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Bullet; Purple Tech details:
Octane Render 2.24.2, 28k spp in PMC mode
Room was modeled in Blender (having size of 3x3x4.5 meters with 50mm round hole in one wall), OBJ file in attachment
Other props are from Poser (The photo camera with tripod >> www.renderosity.com/mod/freest… )
Environment HDRI from HDRLabs >> www.hdrlabs.com/
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:iconlaspe:
Laspe Featured By Owner Feb 17, 2016  Hobbyist Digital Artist
Interesting experiment and impressive result!
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:iconpiitas:
Piitas Featured By Owner Feb 17, 2016  Hobbyist Digital Artist
Weird and interesting :) (Smile)  I had no idea that could work.
It worked with LuxRender too: Camera Obscura with LuxRender
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:iconpnn32:
pnn32 Featured By Owner Feb 17, 2016  Hobbyist Digital Artist
Thank you for mentioning my work and congrats with such nice render challenge result :D
Just wondering, how much time it takes with LuxRender... (CPU-only? Or you have access to network rendering cluster? :))
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:iconpiitas:
Piitas Featured By Owner Feb 17, 2016  Hobbyist Digital Artist
Of course. I would never have found out about the camera obscura thing if it wasn't for your render. So thank you! :) (Smile)
The LuxRender one was rendered with cpu in something like 12 hours and 5kspp. LuxRender can use portals to help guide the rendering process in cases like these, and they gave an insane speedup. Without portals it would be really slow.
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:iconpnn32:
pnn32 Featured By Owner Feb 17, 2016  Hobbyist Digital Artist
The Octane is also has special 'portal' material, but I don't see any improvements (in terms of speed or image quality) with it.. but probably it can help in such specific case...
P.S. Here is another render challenge >> fav.me/d9lfaag , the purpose is getting proper reflections from those small mirrors. The disco ball model is free to download and modify, if needed :)
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:iconruhney71:
ruhney71 Featured By Owner Feb 15, 2016
JUST AWESOME!

I worked on a camera obscura ones. We placed a storage container in the town center, drilled a hole in the side, placed photo sensitive paper on the adjacent wall and let it sit there for hours. At the end of the day we took the paper out and developed it in our lab. Cool thing was that insite of hundreds of people crossing the town center, no soul was seen on the image. Just the buildings. Movement is not registered.

Thanks for putting this up! Really cool!!!! 
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:iconpnn32:
pnn32 Featured By Owner Feb 16, 2016  Hobbyist Digital Artist
So you can easy imagine, how long should be exposure for appropriate image quality... especially when you use software emulation, not hardware (Sun-based, really) implementation  :D
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:iconfirestorm31z:
firestorm31z Featured By Owner Feb 9, 2016
upside down images. 

so the images are projected on the walls upside down?

just trying to wrap my head around on why someone would want upside down images on a wall. :D
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:iconpnn32:
pnn32 Featured By Owner Feb 9, 2016  Hobbyist Digital Artist
No one wants that upside down turn.. so some artists use additional prism behind hole for projection correction :)
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:iconfirestorm31z:
firestorm31z Featured By Owner Feb 9, 2016
projection correction?  please explain.  I'm clueless about that.
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:iconpnn32:
pnn32 Featured By Owner Feb 10, 2016  Hobbyist Digital Artist
I mean turning image again upside down.. so it will be finally projected correctly on wall.
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:icontako-yakida:
Tako-Yakida Featured By Owner Feb 8, 2016  Professional Digital Artist
Great result! Unbiased rendering engines are definitely cool for this reason.
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:iconchanteur-de-vent:
Chanteur-de-Vent Featured By Owner Feb 8, 2016  Hobbyist General Artist
И сколько эта прелесть заняла в часах (днях)?
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:iconpnn32:
pnn32 Featured By Owner Feb 8, 2016  Hobbyist Digital Artist
На самом деле немного :)  меньше часа. Проблема в том, что первые минуты виден лишь черный квадрат с отдельными пикселями, и неясно, когда хоть что-нибудь 'проявится'. Да и заметного снижения шумов (ждал до 40k spp) не происходит в процессе рендеринга... возможно, что проявляются ограничения алгоритмов.
Много времени ушло на эксперименты, в частности понимание принципа, что чем меньше размер отверстия, тем лучше резкость изображения, но меньше светосила этого 'объектива'.. так что пришлось выбирать компромисс.
В описаниях реальных комнат говорилось, что глаза начинают видеть картинку через несколько минут... хотя глаз способен реагировать на отдельный фотоны.. вот так-то.
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:iconfirestorm31z:
firestorm31z Featured By Owner Edited Feb 9, 2016
well that certainly explains the "multi" Titan comment. :D

is this as GPU unit or as a CPU unit?
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:iconpnn32:
pnn32 Featured By Owner Feb 9, 2016  Hobbyist Digital Artist
Did you mean what is 'rig'?  Most commonly used as term for workstation/server with several GPUs or external box with these GPUs.
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:iconfirestorm31z:
firestorm31z Featured By Owner Feb 9, 2016
well, I obviously wrote it poorly.

but yeah, the question is for a render farm rig setup.  a workstation with multiple GPUs (GPU unit) or multiple computers (CPU unit) with 1 GPU.
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:iconpnn32:
pnn32 Featured By Owner Feb 10, 2016  Hobbyist Digital Artist
Second option (computers ...with 1 GPU in each ?) is called distributed network rendering. The first can be more effective, but installing a lot of GPUs into one workstation can has technical limits or can be too expensive (special system boards, external GPU boxes and so on are very expensive).
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:iconfirestorm31z:
firestorm31z Featured By Owner Feb 10, 2016
there is the other aspect in having multiple gpus in one machine, multiple monitors! :D
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:iconchanteur-de-vent:
Chanteur-de-Vent Featured By Owner Feb 9, 2016  Hobbyist General Artist
Ну, допустим что человеческий глаз различает только не менее 4-5 фотонов, и то только после нескольких дней в темной комнате вообще без света. Так что несколько минут адоптации - это фигня. 

Если хочешь, могу попробовать потестировать в Iray.
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:iconpnn32:
pnn32 Featured By Owner Feb 9, 2016  Hobbyist Digital Artist
Да, было бы интересно посмотреть, как с таким iRay справится. Модель комнаты во вложении, HDRI по ссылке в описании, из рекомендаций  - поставить значение imager exposure (не знаю, как точно в iRay это называется) и мощности окружающего света как можно больше, чтобы быстрее увидеть результаты.
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:iconchanteur-de-vent:
Chanteur-de-Vent Featured By Owner Feb 10, 2016  Hobbyist General Artist
Первые тесты с треском провалились. Поставила оба сеттинга на максимум, увеличила до максимума время и количество самплов, она закончила за 10 мин и выдала девственно чистый черный экран. 

Сегодня вечером попробую найти способ запустить "бесконечный" рендер, без ограничений.
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:iconpnn32:
pnn32 Featured By Owner Feb 10, 2016  Hobbyist Digital Artist
А размер объекта (комнаты) был правильно выставлен при добавлении в сцену?  Должны быть единицы измерения  - метры. Дальше если только увеличивать размер отверстия, но тогда снизится резкость.
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:iconchanteur-de-vent:
Chanteur-de-Vent Featured By Owner Feb 12, 2016  Hobbyist General Artist
Эммм... Черт, могла и напутать. Надо будет пересмотреть. Скорее всего загрузила в см, а потом увеличила до какого-то произвольного размера.
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:iconjacekpan:
JacekPan Featured By Owner Feb 8, 2016
Really creative way to using of the tool (I mean renderer):D.
 Few weeks ago I made freebee spotlight, available on rendo (btw) and during the modelling I thought about making exact Fresnel lens to this spotlight and of course to try the effects of lightning by this source of light. Probably Octane should simulate quite naturally lookin' light :D.
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:iconpnn32:
pnn32 Featured By Owner Feb 8, 2016  Hobbyist Digital Artist
Well, you suggested next render challenge for me... playing with some glass optics stuff :D
Btw, I've already made Fresnel lens, featuring it here >> fav.me/d90pyed
Now the time for placing some strong light sources behind them :D
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:iconjacekpan:
JacekPan Featured By Owner Feb 8, 2016
Looking seriously and great! Just can't wait for the final experiment. Here You are the spotlight if You need thight box with flaps ;-) www.renderosity.com/mod/freest… What a shame I didn't make movable head :(, but You can try to combine all together :D. Good luck!
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:iconpnn32:
pnn32 Featured By Owner Feb 8, 2016  Hobbyist Digital Artist
They really looks like spy/security drones, catching someone in parklod :D
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:iconjacekpan:
JacekPan Featured By Owner Feb 8, 2016
lol
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:iconpygfaust:
pygfaust Featured By Owner Feb 8, 2016  Hobbyist Digital Artist
Fascinating!
Thanks for taking the time to explore this phenomenon!
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