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