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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Attachments:
Download 'bugged.jpg' (21 KB)
Download 'bugged.pov.txt' (4 KB)
Preview of image 'bugged.jpg'
![bugged.jpg](/povray.binaries.images/attachment/%3C3e4f70c8%40news.povray.org%3E/bugged.jpg?ttop=443840&toff=8100&preview=1)
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