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A simple path tracer is used to render an old watch. The old watch scene is (almost) the same scene as rendered using image based lighting in my shader "Old watch (IBL)":

You can find the path tracer in Buffer B. I'm no expert in ray or path tracing so there are probably a lot of errors in this code.

Use your mouse to change the camera viewpoint.

Source code

You can find (the full source of) Old watch (RT) on Shadertoy.