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McNistor

Hair inside mesh

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Howdy,

Dealing with a problem I tried to solve for a whole day, procedurally. No luck so far.

There are lots of hairgen strands that go inside the mesh and get some empty patches. The guides are OK, although pretty close to the skin mesh, as that's how I need them to be.

Any idea what's causing this and more importantly how to fix it? I know it's a long shot without files, but unfortunately, I can't share the scene, one of the reasons being it's complex/many external files/ large disk footprint.

 

hair_inside.jpg

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If guides are ok and not getting into the mesh than its probable hairs side. For example, Gude Proces (Frizz) may cause such a thing, so you may decrease the influence of such nodes at the root o the hairs.

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@kiryha Yeah, I noticed Frizz will accentuate the problem (it would be cool if the hair process nodes were more accurate), but the issue here is that I have hairs inside the mesh (attached), even without a guideprocess active. Tried decreasing the voxel size too, but no luck with that either. BTW, the mesh is completely closed, no holes.

hair_inside2.jpg

Edited by McNistor

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Interpolation between guides can be an issue as well. Do those penetrating hairs are far from the guide?

The guide process nodes should take mesh into account as far as I know, at least in some cases, like "Set direction".

Edited by kiryha

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@kiryha No, those are render/gen-hairs. The 1st image below is how it looks from outside. The 2nd is with the guides themselves. This happens only in this region of the entire groom.

hair_inside3.jpg

hair_inside4.jpg

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Ok, for me its looks like an interpolation issue, cos you have guides coming to one direction and guides comming to opposit direction close to them. So in between hairs are a bit confused about where should they grow to.
If its the case there is a solution for such a case, I will try to recall what was it...

  • Thanks 1

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So if its the case of opposit oriented guides. You can draw the curve on the skin which would be a "divider" for hairs, and plug this curve in the last input of Guide Partition (place it after Guide Groom node) node.

Edited by kiryha

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@kiryha It works with lowering the max guide count locally. Hooray!

If the guide-partition was not busted (at least for .391), that would've been the 1st thing I'd try. Anyway, thanks for throwing out the interpolation idea - it pushed me into the right direction.

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