Bidirectional Reflectance Distribution Function, BRDF
Bidirectional Reflectance Distribution Function (BRDF) describes directional dependence of the reflected energy. BRDF is a fundamental optical property. It characterizes the energy scattered into the hemisphere above a surface as a result of incident radiation. The geometry of the BRDF definition is shown in figure below.
BRDF Geometry
The BRDF is defined as the ratio of the reflected radiance (w-m-2-sr-1)
in a particular direction (Thetar,Phir)
to the incident irradiance (w-m-2)
from direction (Thetai,Phii).
The units of the BRDF are inverse solid-angle (sr-1).
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