Value range of normal distribution function

Question

Is the normal distribution term D in the Cook-Torrance BRDF supposed to be between 0 and 1? What does this number actually represent?

ivokabel · Accepted Answer · 2019-12-07T03:29:34.110

2

The term D is a probability density function (PDF) of microfacets' directions. Vaguely speaking, it says what "portion" of all microfacets points in the given direction.

Since it is a PDF, it doesn't have to be less or equal to 1. It can, and often is, higher than 1 for some directions.

edited Dec 07 '19 at 03:29

answered Dec 04 '19 at 17:30

ivokabel

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Value range of normal distribution function

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