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Parameters

Er : irradiance on the diffusing surface
i : angle of the specular reflexion direction with the normal to the diffusing surface
div : half divergence of the diffused beam at FWHM
teta : angle of the observation direction referred to the direction of the specular reflexion
Ref : reflectance of the diffusing surface
LrMax : radiance of the diffusing surface in the direction of the specular reflexion
Lr : radiance of the diffusing surface in the direction of observation