Understanding bidirectional reflectance angles

The following graphic defines the direction of incidence, angle of incidence, and angle of reflection of a ray.

	Incident ray
	Reflected ray
	Material coordinate system X axis
	Material normal
	Direction of incidence of a ray
	Angle of reflection of a ray
	Angle of incidence of a ray

These angles are the independent variables for the following properties in the Thermo-Optical Properties - Advanced dialog box (Thermal/SST/ESC/Multiphysics):

Option	Independent variables
theta (degrees)	phi (degrees)
BRDF	Angle of incidence of a ray	Angle of reflection of a ray
Emissivity	Angle of incidence of a ray	N.A.
Specular Reflectivity	Direction of incidence of a ray	Angle of incidence of a ray
Transmissivity	Direction of incidence of a ray	Angle of incidence of a ray

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Understanding bidirectional reflectance angles, Simcenter 3D 2021.1 Series

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