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Maniphest T97647

Hair Children Particles not stitching to the surface
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Description

System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.65

Blender Version
Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: rBc77597cd0e15

Short description of error
Hair Children Particles not stitching to the emitter surface...

  • setup some basic settings for hair particles
  • remove automatic particles added to the surface in edit mode (aka particle edit)
  • add single hair strands with children view turn on for viewport
  • select the roots and subdivide them a little bit more
  • combing the hair

hair-particle-bug.blend297 KBDownload

Event Timeline

Michael Colina (MichaelBenDavid) created this task.Apr 27 2022, 11:15 AM
Michael Colina (MichaelBenDavid) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Needs Information from User.Apr 27 2022, 8:50 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

By default the particles are generated over the original mesh.
If you want the final mesh generated by the modifiers to be used, you need to enable the Use Modifier Stack option.

For help using Blender, you can try one of the community websites: https://www.blender.org/community/

Did I misunderstand the problem?

Michael Colina (MichaelBenDavid) added a comment.EditedApr 27 2022, 10:30 PM

yes you did misunderstand, this option is not helping, still looks the same with or without any modifiers added, with or without the option checked...

Germano Cavalcante (mano-wii) changed the task status from Needs Information from User to Needs Triage.Apr 27 2022, 11:09 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Apr 28 2022, 9:07 AM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Is this the problem? This is after step 3. Not sure how step 4 and 5 would be relevant

Germano Cavalcante (mano-wii) added a comment.Apr 28 2022, 2:59 PM

This seems to be related to the B-Spline option. (See Path > B-Spline)
Although this option makes things smoother, with it we also "loose a bit of control".

Certainly this can be improved, but the current particle system is not something that is intended to be improved. There are plans to replace it.

Is the B-Spline option related to the problem you describe?

Michael Colina (MichaelBenDavid) added a comment.Apr 28 2022, 4:39 PM

ok yes definitively that option is causing this, and also seems that Roundness option in children tab, is causing a secondary offset of the children strands in both the tip and roots (even though is only supposed to affect the tips and not the roots, but here is affecting both weird... heck i wanted this option but seems i will have to disable it...

Germano Cavalcante (mano-wii) closed this task as Archived.Apr 28 2022, 6:24 PM

Although the B-Spline option limits control and perhaps could be improved, working on this system is not in the plans.

Thanks for the report, but the issue reported here is about a behavior que could be modified/improved and not a bug. Closing as this bug tracker is only for bugs and errors.

For user requests and feedback, you can try other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug