Related Functions
The Spatially Varying Bidirectional Reflectance Distribution Function (SVBRDF) is a 6-dimensional function, where describes a 2D location over an object's surface.
The Bidirectional Texture Function (BTF) is appropriate for modeling non-flat surfaces, and has the same parameterization as the SVBRDF; however in contrast, the BTF includes non-local scattering effects like shadowing, masking, interreflections or subsurface scattering. The functions defined by the BTF at each point on the surface are thus called Apparent BRDFs.
The Bidirectional Surface Scattering Reflectance Distribution Function (BSSRDF), is a further generalized 8-dimensional function in which light entering the surface may scatter internally and exit at another location.
In all these cases, the dependence on wavelength has been ignored and binned into RGB channels. In reality, the BRDF is wavelength dependent, and to account for effects such as iridescence or luminescence the dependence on wavelength must be made explicit:
Read more about this topic: Bidirectional Reflectance Distribution Function
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