Quote - Regular Poser diffuse as well as specular implement the "Lambert method" for this angle-dependant intensity falloff.

Not specular. Just diffuse.

http://en.wikipedia.org/wiki/Lambertian_reflectance

"Lambertian reflectance is the property that defines an ideal "matte" or diffusely reflecting surface. The apparent brightness of such a surface to an observer is the same regardless of the observer's angle of view."

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)