For those who do not have the time to look more closely, here is a picture
with the scene file that produces it.
The spheres on the left use the 'slope' pattern, while those on the right
use a handcrafted function that should create equivalent result (and does
for the opaque case).

-- MeowCat

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Download 'bugged.jpg' (21 KB) Download 'bugged.pov.txt' (4 KB)

Preview of image 'bugged.jpg'