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.
How BRDF Works
The BRDF takes an incoming light direction, ωi, and outgoing direction, ωr (in a coordinate system where the surface normal n lies along the z-axis), and returns the ratio of reflected radiance exiting along ωr to the irradiance incident on the surface from direction ωi.
Applications
- Computer graphics: Used to create realistic lighting and shading in 3D rendering.
- Computer vision: Helps in understanding the interaction of light with surfaces for object recognition and scene understanding.
- Optics: Provides a mathematical model for how surfaces reflect light in real-world scenarios.
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