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There is no way to describe the issue, that's why I'm just going to show the rendered image:

enter image description here

Those are 4 planes with no modifiers, the same dimensions, the same particles, and the same material. The only difference is the topology. All planes are hidden - only the hair is visible.

  • Number 1 is a simple plane

  • Number 2 is a plane with loop cuts (Ctrl + R)

  • Number 3 is extruded (I started with a small plane and made it bigger with extrusions)

  • Number 4 is the same as Num.3 but the cuts are made with "Knife projection"

enter image description here

Numbers 1 and 2 are good, the issues are in 3 and 4

All faces have the same normals. I tied recalculating the normals, I also tried flipping them - nothing worked.

Just in case anyone asks - I'm making a big project and the model with the hair is very complex (I used extrusions, knife projections, and more) that's why I need to fix it without retopologizing the whole mesh. Because the project file is big I made this .blend file with the planes where I recreated the same issue.

Here is the .blend file:

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I'm not sure I entirely understand it, but what I think is going on is that the hairs are set to have "children" and blender is applying a slight rotation to the kink direction of the child hairs via the "Amplitude" value of the kink curl. Setting the value to 0 removes the strange patterning, as does changing the kink type to "nothing", "radial" and "spiral". The other options still show artifacts. I still can't fully explain it, but at least this should make it "go away", if that's what you're after.

Kink

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  • $\begingroup$ Thank you very much. But there is no curl now $\endgroup$
    – Aleks Krumov
    Commented Dec 30, 2020 at 12:07

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