In short (Cycles): rays are traced back from the camera until they reach a source of light or the sky. Understanding its implementation clearly requires some more technicalities, like the BVH, the specificity of volumetric shaders etc, but even without all those details it's pretty clear what's the "idea" behind it. We all know what Cycles is, at least to a first approximation: Cycles isĪ path tracing engine Specifically, cycles is a "backwards" path tracer, which means that it traces light rays by sending them from the camera instead of sending them from light source(s)
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