What is path tracing?


Path tracing is a rendering algorithm that computes the final image by tracing independent light paths from the camera as opposed to methods that trace paths from lights (photon mapping, light tracing), or that precompute and reuse light paths (irradiance caching, UHD cache, light cache), or that do not trace any paths at all (radiosity, most game engines).

Corona Renderer uses path tracing to render images.