Intensity of Sun and Sky

Discussion related to the implementation of new features & algorithms to the Core Engine.

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Re: Intensity of Sun and Sky

Postby crosley09 » Sat Apr 01, 2017 8:17 am

sharlybg wrote:Don't worry my friends I'm very very confused now.


That might be a good summary for this thread ATM... I realized I was not communicating terribly clearly, and was planning on starting a fresh post with more clear documentation at some point. I'm in the middle of my thesis project, so time is short.

sharlybg wrote:So is there a possibility to mimic realworld camera/natural light/ artificial light inside luxcore ?


The short answer is yes. At least with daylight (I've not tested with artificial light yet) I am getting incredible results using real world material, camera, and lighting settings comparing against a photograph. The difficulty here is that comparisons against other rendering engines is not terribly useful. And my main focus was in testing the Irradiance AOV, not the default luminance RGB tonemapped output.
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Re: Intensity of Sun and Sky

Postby sharlybg » Thu Apr 06, 2017 6:54 am

new test with emitter light this time.

iso 100

shutter 1/10

f 8

light power = 960 lumens

Luxcore

cam.jpg


Vray

light set to lumens = 960

Image

light set to luminance = 960

Image
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Re: Intensity of Sun and Sky

Postby sharlybg » Thu Apr 06, 2017 7:36 am

Now most interresting luxcore vs DSLR camera simulator: I think there is a bug inside luxcore (camera/sun)

GLOBAL SETTINGS FOR BOTH :

ISO = 100
SHUTTER = 1/320
Fnumber = 8

SIMULATOR :

sim.jpg



LUXCORE :

luxcore.jpg



And strangely when luxcore camera shutter is 10 time lower 1/3200

luxcore X10.jpg



Or when sun is 10 time lowered .

luxcore sX10.jpg


you can test et real camera yourself and see that luxcore camer or sunsky is too bright.

simulator is here:

http://camerasim.com/apps/original-camerasim/web//?utm_source=CameraSim%20updates
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Re: Intensity of Sun and Sky

Postby crosley09 » Thu Apr 06, 2017 8:48 am

I can post more info later, and there may be opportunities to improve the sun/sky models, but I want to suggest that comparing LuxCore to other simulations tools is not terribly useful because you don't know where the error comes from. (luxcore could be wrong, or the other simulator could be wrong...who knows which)

I can attest that with with the correct settings LuxCore is astonishingly accurate...

Photograph:
1200 photo.JPG


Rendering:
1200 render.png


Camera Settings:
These settings match exactly the settings set on the DSLR which took the photograph.
The shutter speed should be set as in ABSOLUTE mode.
Capture.JPG
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Re: Intensity of Sun and Sky

Postby sharlybg » Thu Apr 06, 2017 9:12 am

This is a pretty good results so far. It 's reassuring. Maybe my lux is bugg or i'm simply wrong.

can you test this render.

Camset2.blend
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