Search found 176 matches

by lighting_freak
Thu May 14, 2020 7:12 am
Forum: User Support
Topic: reflectivity on a black material covered with a clear one
Replies: 1
Views: 156

Re: reflectivity on a black material covered with a clear one

Hello,

I could really use some help here.
Thanks in advance.

BR
by lighting_freak
Tue May 12, 2020 4:34 am
Forum: User Support
Topic: The flickerfree animation challenge
Replies: 47
Views: 1451

Re: The flickerfree animation challenge

Hi,
epilectrolytics wrote:
Mon May 11, 2020 8:08 pm
Knowing the average luminance of the image to render is the only Metropolis requirement
Why does the sampler need this? Isn't it a bit strange to have the result as an prerequisite? What about a MonteCarlo sampling strategy? Does it also need the average luminance?

BR
by lighting_freak
Sun May 10, 2020 8:20 pm
Forum: User Support
Topic: reflectivity on a black material covered with a clear one
Replies: 1
Views: 156

reflectivity on a black material covered with a clear one

Hi all, just a quick question. How does luxcorerender handle the refelctivity of a fresnel glossy black material that is covered with a clear one? This *.blend file should show the principle: Intermediate.blend Usually it should be like this for light inicidence normal to the surface: For the clear ...
by lighting_freak
Wed Mar 04, 2020 8:09 am
Forum: User Support
Topic: Light intensities and matching Cycles
Replies: 83
Views: 9177

Re: Light intensities and matching Cycles

Hello, You are correct. This is in cd/m2 so if you set the tonemapper off and disable color management (show Raw values), the value you enter in your area light in Candela per Square meter (or artistic gain in LuxCore) will be the exact output value: 0.125 cd/m2 = RGB 32, 0.5 cd/m2 = RGB 128. Is the...
by lighting_freak
Tue Mar 03, 2020 1:25 pm
Forum: User Support
Topic: Light intensities and matching Cycles
Replies: 83
Views: 9177

Re: Light intensities and matching Cycles

Hi, just a little question: how do you read light values from the rendering results? I mean how do you get the numbers? I needed some professional (means expensive) software for that task and I'm looking for workaround for this issue. From my understanding (at least) the *.exr results should show di...
by lighting_freak
Sun Mar 01, 2020 9:36 pm
Forum: User Support
Topic: Light intensities and matching Cycles
Replies: 83
Views: 9177

Re: Light intensities and matching Cycles

Hi, Sorry I didn't try exact renderings since there is no official release yet. The changes are to quick during the last days to be sure that I'm on the right daily built. Generally I like the new scientific/artist separation. I'm trying to follow this thread but you lost me during the discussion ab...
by lighting_freak
Sun Mar 01, 2020 1:07 am
Forum: User Support
Topic: Light intensities and matching Cycles
Replies: 83
Views: 9177

Re: Light intensities and matching Cycles

Hi all, Please keep in mind that a camera does only see luminance (neither illuminance nor irradiance). Please refer this thread: https://forums.luxcorerender.org/viewtopic.php?f=4&t=1067&p=15301&hilit=CIE#p15301 Previous version did right results if we assume that the value that is saved in (not to...
by lighting_freak
Fri Feb 07, 2020 5:30 pm
Forum: User Support
Topic: Black Reflections in Complex Glass
Replies: 9
Views: 553

Re: Black Reflections in Complex Glass

Hi You are right. i get closer. but really still miss lot of internal reflection compared to real photo. sc.jpg What did you change to reach this improved result. What's the exact set up? Is it a glass cylinder with an air helix inside? What do you use as environment lighting? Where is your referenc...
by lighting_freak
Sat Jan 25, 2020 10:13 am
Forum: User Support
Topic: Spectral rendering
Replies: 31
Views: 2942

Re: Spectral rendering

I don't know them in detail, what did they do?
by lighting_freak
Fri Jan 24, 2020 9:43 pm
Forum: User Support
Topic: Spectral rendering
Replies: 31
Views: 2942

Re: Spectral rendering

Hi, Just like to agree to the facts mentioned before. For light sources most spectral information is available. A database may makes selection easier. A little harder becomes the light source when it comes to display, hdri and skies. I know that light simulation software tend to use individual RGB s...