OtakuSolutions API Reference

Overview

Used to copy additional bones made on one side to the opposite side.
Explains how to use BipedPlus Edit Utils → Bone Mirror instead of the 3ds Max default Bone Mirror, which tends to produce misaligned results.

Bone Mirror = bone placement/creation stage. Left↔Right pose copying is done in Ani Utils (Ep.9·14).

Max Default Bone Mirror — What's Inconvenient

Mirrors based on the selected bone's pivot (origin), which often results in misalignment rather than a true reflection across the character's center (X=0).
Fixing it requires manually calculating world X coordinates — which is tedious.

BipedPlus Bone Mirror — How to Use

Open Bone Mirror in the Edit Utils area.

Options (simplified)

Option	Meaning
Mirror Plane	Mirror plane — usually the YZ plane (= left↔right flip from the character's front)
X Flip	Flip along the X axis
Headless Axis	Which axis to rotate around during mirror — usually Z for Biped. Keep default recommended

        │ Mirror Plane (YZ)
   Left │ Right
   ────┼────
        │

Steps

Select all bones that will be the mirror source (usually the Left side chain).
Hierarchy → Parent — to preserve the child bone structure (may need to lock Parent manually at first).
Execute Mirror.
Verify that Left / Right names changed per convention.
Move them and test that the Z-axis rotation etc. is symmetrical.

When to Use

When creating custom Hair/prop bones on one side (like Ep.11) and cloning to the opposite side.
For front-based symmetry instead of the Max default Mirror.

Notes

If Hierarchy Parent is not set correctly, the parent may detach or the tree can break.
Do not casually change Headless Axis.
Rigging Info Update after mirroring (Ep.10).