Paths not dividing / uniting correctly (jittery paths)
It seems that with more complex paths, using the unite and divide Pathfinder tools create jittery shapes (when you zoom in very very close, you can see that the merging / division isn't perfect and that shapes have been disfigured). Same with paths / shapes where smooth corner have been used: use of Pathfinder tool is going to disfigure them. (posted to the support on Twitter)
If this does happen for you, please open your Pathfinder panel’s options and change the Precision value it has. Lowering the values improves results, especially on very long curved segments, but also increases the overall time a complex pathfinder operation takes.
Please comment below if this advice helps — the team can use this feedback to reconsider the default value.
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Red Bryant commented
I have now altered the precision setting in pathfinder options to 0.001pt and it's working correctly now. The default isn't low enough!
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Red Bryant commented
This is also happening for me, when I use pathfinder to subtract a shape from another, the remaining path is different slightly. I'm using v2023 27.0.0
In the attached screenshot, you can see the original (blue shape) and the new shape (brown) with the bottom removed after using pathfinder