On 6-4-2016 15:46, clipka wrote:

> Actually, having read up a bit on the models' origins and technical
> background by now, I'd say the following:
>
[...]

Thanks indeed. That answers my questions and makes comprehensive the use 
of both Lambertian and oren_nayar models. As for my own use, I think I 
shall skip the lommel_seeliger model.

-- 
Thomas

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