SkirtBone RollFix - One-Click Bone Roll Correction Tool [VRChat Blender]

“Why are my skirt bones all oriented weirdly...?”

“Guess I have to redo everything or fix them manually. It’s so over for me.”

If you’re one of the many Blender users suffering from this exact problem, allow us to lend you a helping hand.

※ Now included with PhysBone AutoRig( https://ktjp.booth.pm/items/8741186 )

If you own PhysBone AutoRig, you can download SkirtBone RollFix for free from the product page. We highly recommend using them together!

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◆ Give me the short version!

SkirtBone RollFix is a Blender addon that automatically corrects the orientation of Armature bones—primarily skirt bones—into a radial layout for use with VRChat PhysBones.

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◆ What is SkirtBone RollFix?

A simple, slightly-handy Blender addon for VRChat PhysBones.

It analyzes the selected armature bones and automatically adjusts their roll so that they face outward radially from the center (0, 0).

It is also designed to be used alongside PhysBone AutoRig, particularly for adjusting bones automatically generated by it.

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◆ Features

Adjusting the orientation of skirt Armature bones created in Blender is as simple as:

1. Select all the bones you want to adjust.

2. Right-click or open the Armature menu.

3. Click once.

That's it. The bone orientations are automatically corrected!

Once imported into Unity, the result can be used immediately by simply adding a PhysBone component to the parent bone.

And of course, you can undo the entire operation at any time with Ctrl+Z.

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◆ How to Use

1. Enter Armature Edit Mode.

2. Select all the bones you want to adjust.

3. Make sure the center of your model is located at X=0, Y=0, and that the target bones are not positioned directly on the center axis.

(The addon automatically detects whether a bone overlaps the center axis.)

4. From the Armature tab in the upper-left corner of the screen, or from the right-click menu, select “Radially Correct (Skirt) Bone Roll.”

5. The adjustment is automatically applied to all selected bones!

What used to take tens of minutes—and could become an incredibly frustrating task if something went wrong—can now be finished by anyone in just a few minutes.

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◆ Supported Versions

Confirmed working:

- Blender 4.1

- Blender 4.2 LTS

- Blender 4.5 LTS

Theoretically supported:

- Blender 3.6 LTS

- Blender 4.0

- Blender 4.3

- Blender 4.4

Blender 5.0 and later are not recommended and have not been tested, although the addon may still work.

Operation on versions other than those confirmed above is not guaranteed. However, we will do our best to provide support to purchasers.

※ Works on Windows, macOS, Linux, and any other environment where Blender itself can run.

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◆ Included

- SkirtBone RollFix Blender addon

- README / User Manual

- 2 installation guide images

(for Blender 4.1 and earlier / Blender 4.2 LTS and later)

- LICENSE

- 2 product description images

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■ Terms of Use

This add-on is a paid product sold by -2℃ Shop. The code component is licensed under the GNU GPL v3, in accordance with Blender's specifications; this grants the freedom to use, study, modify, and distribute the software.

Additionally, since the GPL requires the license to be inherited upon modification, the source code must remain fully accessible and usable, ensuring these rights are preserved.

However, the GPL applies only to the code component of this add-on. All other elements—including accompanying materials, download/update services (such as Booth), and support—fall under the jurisdiction of -2℃ Shop, and these benefits are available exclusively to the purchaser. Consequently, redistribution or secondary distribution of these elements—whether modified or unmodified—is strictly prohibited.

Note: "Purchaser" includes those who bought PhysBone AutoRig.

The developer and -2℃ Shop assume no liability for, nor do they interfere with, any avatars or models that have had some or all of their bones adjusted using this add-on.

All rights belong to the avatar/model creators and are subject to their respective terms of use. Therefore, all rights to content created using this add-on—whether for personal or commercial use—belong solely to the content creator.

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■ Support

For bug reports, questions, feature requests, or any other support inquiries, please contact me via BOOTH messages or X: https://x.com/katyushajp

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■ Release Notes

2026/08/22 — Initial Release