Ray Bellis wrote:

> Curiously these models all seem to describe ways to approximate the 
> resulting light intensity fall-off for direct ray-tracing to light sources.


Not sure if the wikipedia article was the best to cover path tracing
needs. But at least pbrt/Luxrender has implemented Blinn stuff. And it
seems good (and definitely works for any light arriving to a point, not
just direct)

> I guess that's the advantage of the Monte Carlo method - if you're going to 
> cast millions of rays you can afford to average out the results numerically, 
> rather than use a mathematical approximation.

Yeah, and with modern multi-core CPUs Monte Carlo is actually possible.
You get good image usually in hours and more the cores we get, the
better. This stuff scales perfectly.

> Do you happen to have the geometry of your sample images available?  I'd 
> like to try to create the same scenes to compare results.

Not at present. I still try to figure out a few problems in my code.
When I know the results are truly unbiased and accurate, I can put a few
simple test scene geometries somewhere and the output.

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