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Physically based rendering from first principles

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imad

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Description

Physically based rendering from first principles is an interactive educational article by imad that builds PBR intuition from the physics of light through material models used in computer graphics.

It covers light as waves versus ray optics, Maxwell context, how light is generated, absorption versus scattering, reflection and Snell's law, Fresnel and Schlick, microfacet roughness, metals versus dielectrics, and spectral power and reflectance curves, with on-page diagrams readers can manipulate.

It is aimed at beginners and early intermediate learners who want the physical story behind BRDF parameters before engine-specific shader code.

The material is a free multi-chapter HTML page with interactive widgets that progressively abstract optics into rendering-friendly models.

It is useful as a self-paced primer connecting everyday light phenomena to modern PBR material language.