On 6-4-2016 12:28, And wrote:
> Or the carton.
>

Powdery/chalk, carton, yes that makes sense indeed for oren_nayar.

Got back to the original clipka message:

[quote] The Lommel-Seeliger model has its roots in astronomy, where it 
is used to model "lunar type" (i.e. rocky or dusty) surfaces, while the
Lambertian model is used for "icy" surfaces, and weighted averages of
the two are used to model anything in between. [/quote]

What would you say for the following:

- Lambertian for icy or shiny surfaces;
- oren_nayar for fine, powdery-like surfaces;
- lommel_seeliger for coarser, dusty-like surfaces.

-- 
Thomas

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