Thanks, I'll check it out. What I would really like to have though, is the
Fresnel reflecion/refraction model. This allows, for example, very realistic
metallic surfaces (provided you can find the right ior for, say, copper -
0.83 or something)

Margus

Jerry Anning wrote in message <37161d00.5566014@news.povray.org>...
>On Thu, 15 Apr 1999 19:12:16 +0300, "Margus Ramst"
><mar### [at] peakeduee> wrote:
>
>>What's an Oren-Neyler-Blinn surface model, and would I want to have it in
>>POV? I would, wouldn't I :)
>
>This probably refers to the Oren-Nayar reflectance model.  It is a
>diffuse lighting model that handles rough surfaces more accurately
>than the usual Lambertian model.  Larry Gritz has a Renderman shader
>for BMRT that does the Oren-Nayar model if you want to look at that.
>The relevant paper is:
>Oren, Michael and Shree K. Nayar
>Generalization of Lambert's reflectance model
>Computer Graphics Annual Conference Series 1994 (SIGGraph 94)
>pp. 239 to 246
>It doesn't look like it would be too tough to add to POV.  You can get
>the shader at the RenderMan Repository if you want to study the code.
>
>Jerry Anning
>clem "at" dhol "dot" com

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