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This is only active if there is not an atmosphere; the Delta-Eddington model used to handle atmospheric opacity includes the assumption that the surface is Lambertian. 

In some later version when more input parameters are available, it is intended to be allowed when there is an atmosphere [CHECK IF LATEST VERSION DOES IT].

Photometric function include Lambertian, Lommel-Seeliger, Kheim / Lunar-Like, Minnaert (see V34UG.pdf for formalism).

Users can set the photometric function by setting PhotoFunc:

====Minnaert====

 PhotoFunc = [-1.-0.[
 ALBEDO = [0-1]

with Minnaert coefficient = abs(PhotoFunc)


====Kheim / Lunar-like====

 PhotoFunc = ]0.-1.[
 ALBEDO = [0.-1.]
For Lunar-like (Kheim=0.25, Vasavada=0.375).


====Lambert====

 PhotoFunc = 2
 ALBEDO = [0.-1.]


====Lommel-Seeliger====

 PhotoFunc = 3
 ALBEDO = [0.-1.]


[[Image:PhotoFunc.png|1100px]]

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View source for Photometric Functions

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