In Shafer's dichromatic reflection model, ^[1] scene radiance has two components:

${\displaystyle L(\lambda )=m_{\mathrm {b} }c_{\mathrm {b} }(\lambda )+m_{\mathrm {s} }c_{\mathrm {s} }(\lambda )}$

λ is the wavelength,

c_b is the body ( diffuse) reflected component,

c_s is the surface (interface) ( specular) reflected component,

m_b and m_s are scale factors depending on illumination, view directions and surface orientation.

Body essence is an entity invariant to interface reflection, and has two degrees of freedom. The Gaussian coefficient generalizes a conventional simple thresholding scheme, and it provides detailed use of body color similarity. ^[2]

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