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[Solved] Strandbased Very Short Pixie hair not following the head of some characters

ElorElor Posts: 3,131
edited October 12 in Technical Help (nuts n bolts)

Edit October-12-2025: I just saw that an update was pushed for this product and after testing it with the morph I created removed, the hairs fitted Hanako 9 perfectly without it.

Hello,

I'm speaking about this product:

https://www.daz3d.com/dforce-strand-based-very-short-pixie-style-hair-for-genesis-9-and-8-female

I tried to fit it on Hanako 9 (the problem does happen with other characters), and the hairs ended inside her head…

It seems to be mainly linked to her proportion slider:

What's strange is that the cap itself is following her head perfectly, as shown on the following screenshot in Iray preview: it's the strandbased part of the hair that doesn't follow the shape of the figure. Isn't that part supposed to follow the cap itself?

Does someone know how to solve the problem?

pixie_hair_bug_hanako_9.jpg
800 x 800 - 57K
pixie_hair_bug_hanako_9_proportion_slider.jpg
1295 x 879 - 153K
pixie_hair_bug_hanako_9_bis.jpg
800 x 800 - 116K
Post edited by Elor on

Comments

  • crosswindcrosswind Posts: 9,537
    edited September 29

    Usually the vendor has no way to provide fixed FHMs for all characters... You're right, in this case the culprit seems to be Proportion Neck Length. 

    How to fix:
    1. Select Hair Strands node, Show Hidden Properties in Parameters pane, set head_bs_ProportionNeckLength to 30%. (ss1)
    2. With Geometry Editor, export Hair Strand to OBJ by using the file name : Hanako9_head_bs_Head.  Alt + Click head_bs_ProportionNeckLength to reset it to -30%.
    3. Import OBJ to Hair Strand with Morph Loader Pro to update auto follow FBM : Hanako9_head_bs_Head, as usual by using the options: Reverse Deformations: Yes; Overwrite Existings: Deltas Only. Save Hanako9_head_bs_Head as a Modifier Asset. (ss2)

    Fixed. Alt Shift + U. Now remove the hair and reload it. It'll work. (ss3)

    Edit: It's the standard way to fix FBM. Still, the simplest way is to just parent such a short hair to the head instead of fitting it ~~

    SNAG-2025-9-29-008.png
    2017 x 1291 - 1M
    SNAG-2025-9-29-009.png
    2019 x 1289 - 727K
    SNAG-2025-9-29-010.png
    2018 x 1294 - 2M
    Post edited by crosswind on
  • ElorElor Posts: 3,131

    Thank you :)

    I was able to solve the problem with Hanako 9.

    I tried to save a morph for head_bs_ProportionNeckLength but was not succesful. Is there a trick to be able to do so? At worse, I'll continue to fix character when a problem happens but I thought that fixing the neck morph could maybe solve every other characters?

  • crosswindcrosswind Posts: 9,537
    edited September 29

    Yes, you certainly can fix head_bs_ProportionNeckLength at the first place. Not sure how you did it, but you need to do it on a G9 Base, then dial Proportion Neck Length to 100% before fixing.

    - Dial head_bs_ProportionNeckLength on the root node of the hair to appr. 50%, export Hair Strand to OBJ. Ctrl + Z.
    - Import OBJ to update head_bs_ProportionNeckLength on Hair Strand. Save the Modifier Asset.

    However, only fixing head_bs_ProportionNeckLength is not 100% perfect for Hanako, you still have to further fix her FHM : Hanako9_head_bs_Head ...

    SNAG-2025-9-29-012.png
    2019 x 1293 - 1M
    Post edited by crosswind on
  • ElorElor Posts: 3,131
    edited September 29

    I didn't change the head_bs_ProportionNeckLength on the root node but directly on the strand based and I suppose the influence from the root node was messing with what I was trying to do.

    I'll try your solution later today :) Thank you again!

    Post edited by Elor on
  • crosswindcrosswind Posts: 9,537
    edited September 29

    Elor said:

    I didn't change the head_bs_ProportionNeckLength on the root node but directly on the strand based and I suppose the influence from the root node was messing with what I was trying to do.

    I'll try your solution later today :) Thank you again!

    Ah, that's also doable but don't zero it 'cause it'll bring it no deltas, just give it a very small value like 0.1 ~ 0.5%. It'll work as well. 

    Post edited by crosswind on
  • ElorElor Posts: 3,131

    Thank you :)

    I'll try another day because even on my most powerful computer, creating the morph from a 30 MB .obj file takes between 5 and 10 minutes.

  • crosswindcrosswind Posts: 9,537

    You're welcome !

    Yea, OBJ file size was around 28MB... but it took less than 30 seconds to finish the import on my side. Not sure why it takes so long on your side... IIRC, Mac ? 

  • ElorElor Posts: 3,131

    I'm creating morph on my Mac, which has an M1 Pro CPU, likely more powerful than the Core i7 4790k I have inside my PC.

  • ElorElor Posts: 3,131

    An update was recently made available for these hairs and after installing it then loading the hairs on Genesis 9 with the morph I created for Hanako removed, everything worked perfectly.

    I didn't open a ticket, maybe someone did, maybe Outoftouch saw this discussion, regardless of the cause, thank you very much, Outoftouch, for fixing it smiley

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