Implemented accumulation, now the path tracer (like most other cool GPU tracers) updates in real-time, so that you can see the noise slowly disappearing.
This clearly still isn't physically accurate...I think the direct illumination model that I'm using as the final step is causing some pretty bad bias.
Still, not bad for a day's work. And, on the bright side, it's really fast! The image above took about 15 seconds to accumulate!
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