Re: Mediabook, Welcome to Your Age of Quantum Consciousness
Posted: Fri Sep 27, 2019 12:42 pm
Show your work, get help, participate in development
http://forums.luxcorerender.org/
Awesome!FarbigeWelt wrote: ↑Fri Sep 27, 2019 1:31 pm - - Here it finally is! - -
The first allowed to take picture since photography's invention.
The unbelievable fifteen centimeters radiant,
the biggest, the most brilliant, the one and only pink diamond on earth.
Brilliant Revealed Luxcorey.png
openCL, path hybrid, Sobol
250324 samples, 02h16m
2.42M pixels
keywords: diamond; refraction; inner reflections; dispersion; gold; reflections; blue matte; indirect light; direct light
Thank you for your feedback.arescet wrote: ↑Sat Sep 28, 2019 6:06 pm Awesome!
i hope you don't mind, but can you tell us more about the settings you used for this beauty here?
what i mean is how did you get 250324 samples in only 2 hours? that to me is enviable sorcery!
also, i am very interested in how you set up that pink diamond material
Thank you for well thought out and detailed response, i appreciate it very much!FarbigeWelt wrote: ↑Mon Sep 30, 2019 1:38 am
Thank you for your feedback.
First, I have to graphic cards running, amd rx 5700 xt.
Second, the scene and the materials are simple.
The room cuboid is based on solidified cube and has real room size.
There are four point lights. Below each there is a flat cuboid reflector. This way there is only direct light from a spot light with a narrow angle.
The table is a cuboid. The brilliant is based on standard Blender add-on, one for additional meshes.
The golden shell is made with cloth physics. Its material is a golden yellow mirror.
The brilliant's material is glass with the IOR of diamonds, with a faint pink. All other materials are matte.
There is no cache used but light tracking for the few caustics.
Due to indirect lightening and the caustics the render needs at least 15'000 to look okay and 25'000 samples to look great.
Optimized clamping avoided bright fireflies, soft fireflies left are removed by denoising with OIDN.
Ooops! Yes, I meant light tracing with light tracking. I think tracing and tracking is synonymous. The BlenderLuxCore uses the term light tracing.
oooh cauchy!FarbigeWelt wrote: ↑Tue Oct 01, 2019 9:34 am
Ooops! Yes, I meant light tracing with light tracking. I think tracing and tracking is synonymous. The BlenderLuxCore uses the term light tracing.
The material of the brilliant has an estimated value for dispersion, dispersion equals coefficient B see Cauchy's equation. You should be able to find other sites with coefficient B values for the equation, including one for diamond. But for some unknown reason there are different notations of Cauchy's equation with different units for the coefficients and additional coefficients. I tried to rearrange some formulae in an algebraic matter to proof their equality and to transform the coefficient into one unit. Unfortunately I was not successful in the time I wanted to spend. In addition, I found no regularity in comparison of index of refraction and Cauchy's coefficient B. Finally, if there is no value in Wikipedia, the best way is to guess and trial error until result looks appropriate.
With factor nothing else than zoom factor is meant. I zoomed into parts of the image to show progress / converging depending on Sample count.
Cheers!
You probable already know the refractiveindex.info databaseFarbigeWelt wrote: ↑Tue Oct 01, 2019 9:34 am Unfortunately I was not successful in the time I wanted to spend. In addition, I found no regularity in comparison of index of refraction and Cauchy's coefficient B. Finally, if there is no value in Wikipedia, the best way is to guess and trial error until result looks appropriate.
Thank you for sharing your calculations. Your idea is good to list several wavelengths and refracting indices because one requires at least two wavelengths and two refraction indices for the calculation of two coefficients, A and B, of Cauchy's equation for dispersion.Fox wrote: ↑Thu Oct 03, 2019 12:25 pm You probable already know the refractiveindex.info database
https://refractiveindex.info/?shelf=3d& ... ge=diamond
I get very high B value, maybe my formula is wrong
cauchy A: 2.381942809424
cauchy B: 0.012035304932
cauchy equation diamond.7z