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Despite aesthetic diversity, the math that drives video game and movie lighting is almost always derived from the same exact lighting model. Knowing is half the battle, so today we go over how Disney derived their hallmark principled BRDF and how you could do it yourself!

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Topics Covered: what math is, how light works conceptually, the rendering equation, diffuse light, lambertian reflectance, lambertian diffuse BRDF, specular reflectance, phong lighting, blinn-phong BRDF, microfacet theory, the microfacet BRDF model, the Burley diffuse, microfacet distribution, fresnel reflectance, geometric attenuation, Disney's principled BRDF

References:
https://seblagarde.wordpress.com/2012/01/08/pi-or-not-to-pi-in-game-lighting-equation/
https://media.disneyanimation.com/uploads/production/publication_asset/48/asset/s2012_pbs_disney_brdf_notes_v3.pdf
https://boksajak.github.io/files/CrashCourseBRDF.pdf
https://github.com/wdas/brdf/blob/main/src/brdfs/disney.brdf
https://diglib.eg.org:8443/server/api/core/bitstreams/726dc384-d7dd-4c0e-8806-eadec0ff3886/content

Music:
Afternoon Break - Persona 3 OST
In A Moment's Time - Skullgirls OST
Junes Theme - Persona 4 OST
Midori Eyes - Paradise Killer OST
GO!GO!STYLE - Paradise Killer OST
New Game - World Of Horror OST
During The Test - Persona 3 OST
Layer Cake - Persona 5 OST
A New Frontier - Va11Halla OST
Judgement - Sonny Boy OST
Neon District - Va11Halla OST
Every Day Is Night - Va11Halla OST
Your Love Is A Drug - Va11Halla OST
With Renewed Hope, We Continue Forward - Va11Halla OST
Like A Dream Come True - Persona 4 OST
Afternoon Break - Persona 3 Reload OST

Thanks for watching!

This video is dedicated to my friend, Alotryx.

#acerola #gamedev #unity3d #graphics #shaders

Acerola

A deep dive into the mathematics behind modern computer graphics rendering, starting from the rendering equation introduced in 1986 and building up to Disney's principled BRDF. Covers Lambertian diffuse, Blinn-Phong specular, and why they fail or succeed as physical models. Explains microfacet theory, the GGX distribution, Fresnel approximation, and geometric attenuation. Details all 11 parameters of Disney's principled BRDF including diffuse, subsurface approximation, sheen, specular, anisotropy, metallic, and clear coat lobes, showing how a single unified shading model can represent every surface from sparkly snow to metal foil in films like Wreck-It Ralph.

The Secret Behind Photorealistic And Stylized Graphics