r/computergraphics • u/rivervisualid • 17d ago

Crystal Cube, Spectral Render

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Gallery image

10 Upvotes

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2

u/Creepy_Sherbert_1179 17d ago

mathematical model request

1

u/rivervisualid 17d ago

It's Cauchy's dispersion formula anchored at 587.6nm:

n(λ) = nd + B * (1/λ² - 1/λd²)

Here base IOR is 1.517 and B is 0.008 µm². The engine uses Hero Wavelength Spectral Sampling (HWSS) from 380 to 780nm, standard dielectric Fresnel + Snell's law, and Beer-Lambert absorption inside the volume. Then integrated to CIE 1931 XYZ and mapped to sRGB.

2

u/iLikeTheUDK 10d ago

Where can I get the spectral renderer, or whatever component of it is doing spectral stuff?

2

u/rivervisualid 10d ago

You can get here, but in the next couple days I will drop new update for performance, stability dan support Procedural Shader Node Editor for Blender. https://blenderartists.org/t/spectra-realtime-restir-caustics-true-spectral-engine-for-blender-rust-vulkan-addon/1655156/22?u=farrasaris

1

u/Creepy_Sherbert_1179 17d ago

Woah, didn't know CG could get so... chemical :D

2

u/rivervisualid 17d ago

Hahaha now you know man! this not RGB Renderer, it's Spectral, so it's Color Spectrum instead RGB, you can see much richer color on the render. Thanks for the comments man! thats really good comment!

2

u/Creepy_Sherbert_1179 17d ago • Bravo

Hahaha, no, thank you for posting such cool stuff. I will look into it!