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What's the difference between Raytracing and Physically-based-rendering?

I know raytracing is a technique based on the route calculation done by the light, following the rays through the interaction with the surfaces, and that Pbr is a collection of render techniques that ...
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Ray tracing - BRDF using Cornell measured spectral data

I wrote a ray tracer that implements various BRDF models (Oren Nayar, Lamber, Torrance Sparrow and so on). Now I'm trying to implement a BRDF from measured data. I choose the Cornell database data ...