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- Physically Based Rendering/Shading
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- https://www.marmoset.co/posts/basic-theory-of-physically-based-rendering/
- - albedo: a color which describes the fractions of various colors of light
- that will scatter back out of a surface.
- “Diffuse color” is a phrase sometimes used synonymously.
- - Reflection
- - Diffusion
- - Energy conservation:
- - Reflection and diffusion are mutually exclusive.
- - Fresnel
- - Differing reflectivity that occurs at diffent angles
- - Microsurface
- - Gloss, smoothness, roughness.
- - BRDF - Bidirectional Reflectance Distribution Function.
- - Function of View and Light direction - f(l, v)
- - For a ray of incoming light from a given direction
- the BRDF function gives the distribution of outgoing light
- in all directions.
- - For a given view direction, the BRDF gives the relative
- contribution of each incoming direction.
- - The BRDF varies by light wavelength
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