Bidirectional reflectance distribution function

Common card · No. 325962

The bidirectional reflectance distribution function (BRDF), symbol f r ( ω i , ω r ) {\displaystyle f_{\text{r}}(\omega _{\text{i}},\,\omega _{\text{r}})} , is a function of four real variables that defines how light from a source is reflected off an opaque surface. It is employed in the optics of real-world light, in computer graphics algorithms, and in computer vision algorithms. The function takes an incoming light direction, ω i {\displaystyle \omega _{\text{i}}} , and outgoing direction, ω r {\displaystyle \omega _{\text{r}}} (taken in a coordinate...

Read on Wikipedia · Image BRDF_Diagram.png: Meekohi derivative work: tiZom(2¢), CC BY-SA 3.0