Also, to put into perspective how slow the rendering engine is when dealing with actual light sources instead of just the sky, that last image inside the Grande Theatre took ~10.5 hours to render overnight (maxing out my 4 cores at 100% on this ~3 year old 2.8GHz i5) when configured to use only the torches as light sources. And it's still grainy! Another 10 hours maybe could have smoothed it out better. The other images took roughly 10-15 minutes of render time each using just the sun.
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