Portals in cathedral - lots of trials

All images taken at 20 samples. I was curious to see what effect light clashes would have (e.g. when portals point at each other from opposite sides), and what would happen if I included a colored glass surface.
no portals:

with portals on all openings:

portals on only the righthand openings and the large round one:

no portals, but with a colored glass window in the round one:

with portals on all openings (including behind the colored glass):

portals on only the righthand openings and the round colored glass:

The second image (portals everywhere) is definitely the best, but adding in the colored glass window in front of the large round opening definitely increased the noise a lot.

and here it is with portals at all openings at 128 samples


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