Am 30.03.2012 00:52, schrieb Crippso:
> Hi, I'm still struggling to correctly draw simple scenes using fresnel
> reflection and photons (code below). Any idea why this code doesnt show the box?
> with ior = 5 I expected to see the box being about 0.44 intensity

It seems to me that you have a severe misconception about what POV-Ray's 
"photons" feature does.

POV-Ray's "photons" feature is a way to model light rays that first 
reflect off a mirror, or get refracted, and then get scattered off a 
diffuse surface into the camere.

It does /not/ model light rays that reflect off a mirror directly into 
the camera. Those are accounted for by the "specular" or "phong" feature 
instead.

(Unfortunately, "specular" and "phong" will not help you either, as they 
currently do not model fresnel falloff. You might be able to pull off 
some stunt with the "aoi" pattern, to blend between textures with 
different "specular" or "phong" parameters, but you'll have to implement 
the fresnel formula yourself in that case.)

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