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Combing particles pushes them inside of the mesh/skull
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A download link to the Blender file can be found at bottom part of this post.

What Iā€™m trying to achieve: Create a long hair for a character by using particle hair system

Issue: The moment I comb the hair/particles, some particles are pushed inside of the mesh, which creates bald spots:

https://preview.redd.it/2bmsg9fjm4xb1.jpg?width=1920&format=pjpg&auto=webp&s=394f820546e23337dad523d81123f1e67301efd2

https://preview.redd.it/mnw9hxzjm4xb1.jpg?width=1920&format=pjpg&auto=webp&s=69690c2e1c419a6a50ea3b137f6962e837b25a76

The methods I tried, to resolve the issue but was no help:

  • Normals are facing the correct direction.
  • Removed doubles. No improvement was observed.
  • Increased mesh density/subdivided the mesh
  • Increased parent hair particles/emissions count.
  • Increased children count
  • Tweaked roughness and other related settings in the particles panel
  • Changed children method from ā€œInterpolatedā€ which is the desired method for this project, to ā€œSimpleā€
  • Added more parent particles/emission on the bald spots, manually by using the ā€œAddā€ tool in the ā€œParticle Editā€ mode. It didnā€™t really solve the issue since the moment the new particles are combed, the same issue is re-produced.
  • Combing while ā€œDeflect Emitterā€ value is set to different numbers. (I tried from 0.1 to 2, but it was not helpful. The moment you decrease the number to get the hair closer to the character (Otherwise the hair just floats in the air), same issue arises, at the same spots.
  • Cut the skull part where the hair is present, and tried to use it as a secondary hidden mesh by hiding the emitter but the bald parts are still pointedly apparent
  • Changed the start/end values in the timing tab

Upon close inspection, you can see that roots are placed correctly. Itā€™s just for some reason Blender pushes them inside of the mesh:

https://preview.redd.it/m3mylu1mm4xb1.jpg?width=690&format=pjpg&auto=webp&s=05850a82994da406b1b8d723ca2f823b08c59f8a

Blender file: https://drive.google.com/file/d/1qVl55bcovQuxe0BSURE7cHsG33-J63BF/view?usp=sharing

Blender Version: 3.6

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1 year ago