I just noticed that the following scenes are "broken" in the sense that
they behave differently depending on whether they are rendered with
POV-Ray 3.6 or 3.7 (beta 33):
wineglass.pov:
The checkerboard has black & white swapped.
var_reflection.pov:
In the bottom-right corner, POV-Ray 3.7 swaps light & dark stripes.
normal.pov:
The top-right block appears less bumpy with POV-Ray 3.7.
newdiffract.pov:
With POV-Ray 3.7, the items exhibit a yellow tint that wasn't there with
3.6.
grenadine.pov:
The drink appears to have a stronger IOR with POV-Ray 3.7.
brick.pov:
The right side of the top-right block looks different.
Various scenes with photons:
The caustics appear less bright with POV-Ray 3.7; some scenes exhibit
additional differences.
Various scenes with crackle:
It appears as if POV-Ray 3.7 uses a different seed or random number
generator.
noise_generator.pov:
The leftmost spheres exhibit a different pattern, which appears to have
a lower "contrast" in POV-Ray 3.7.
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