Percentage Closer Filtering doen’t work well on iOS 15.5. Shadows aren’t smooth. Here’s an example.
Reference:
iOS 15.5:
I reproduced the issue on iOS 15.2, 15.5, 15.7, 16.1 in Safari with babylon.js 5.32.0 as well as with babylon.js 4.2.1.
I can repro and I am having a look to see if you should open a ticket on webkit which I am afraid might be needed. I ll let you know in a bit.
It unfortunately seems to be an issue on ios safari only 
Could you open a ticket on webkit for it ???
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You should let them know it is only an issue with webgl via metal…. So definitely not smthg we can workaround on our side
Disabling it like here makes it ok
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Thank you! I reported to WebKit.
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