OtakuSolutions API Reference

SkinLayer Studio 1.3.x Standalone UI reference.
Practice: EP00–EP12 · Features: F01–F17 (order 50+).

What is JSON for?
Transfer layer weights only. Backup, Import into another session, Max connector.
Mesh/skeleton package or Pick failure → FBX.

Export SLS layer weights to a .json file, then
apply them to Skin in the 3ds Max connector, or Import them back into SLS.

What this does

	Description
Does	Saves the mesh LayerStack weights (+ meta · bone/vertex info) as `os_skinLayer_studio` JSON
Uses	Backup · offline apply in Max · continue work in another PC/session of SLS
File examples	`Body_Geo_weights.json`, `Dummy_Body_weights.json`

Separate from Apply to Skin (live DCC push) — this is a file-based exchange / restore path.

Menu locations

Tools  →  Export Weights (.json)
Tools  →  Export Weights to Folder...
Tools  →  Import Weights (.json)...

Tools menu — Export / Import JSON

Export Weights (.json)

Item	Description
Target	Current active mesh only
Action	Choose save path → write `{meshName}_weights.json`
Contents	Layer weights · mesh_name meta · bone/vertex info (when available)

Cannot save if the active slot has no weights yet (before Pick).

Export Weights to Folder...

Export Weights to Folder

Use when exporting many meshes as JSON into one folder.

UI	Description
Select All	Select/deselect all in the list
Check list	Meshes loaded in Skin Desk (`Body_Geo`, `Dummy_Body`, …)
Export Selected Mesh Weights (JSON)	Save `{name}_weights.json` for each checked mesh
Cancel	Close

After you pick a folder, one file per mesh is created. (On name clash, suffixes like _weights_2.)

Reload in SLS (Import)

Tools  →  Import Weights (.json)...

Load the receiving mesh into Skin Desk first (Pick)
Import Weights → choose the JSON file
Match Target mesh and apply

Use this path when restoring a backed-up JSON into SLS.

Load in the 3ds Max connector

In Max, open the SkinLayer Studio Connector window, then:

[Import Weights (*.json)]

Add JSON files (multiple OK)
Match to scene meshes by filename / meta.mesh_name
e.g. Arm_Geo_weights.json → scene Arm_Geo
Run Import → apply weights to Max Skin (offline JSON import)

Connector About also describes this as Offline JSON weight import utility for 3ds Max.
A same-name mesh must exist in the scene for matching.

Flow at a glance

[SLS] Paint · layer work
   │
   ├─ Tools → Export Weights (.json)          ← active 1
   └─ Tools → Export Weights to Folder...     ← multiple meshes
              ↓
         *.json files
              ↓
   ┌──────────┴──────────┐
   ▼                     ▼
[SLS] Import Weights    [3ds Max Connector]
  (.json)...             Import Weights (*.json)
  → edit again           → apply to Max Skin

Related docs

Doc	Contents
Transfer Weights · Tools menu	Full Tools menu
UI layout guide	Menu bar · Apply to Skin
Import / Export FBX	FBX · Pick alternative
Practice EP02 Install	Connector install

Images: export_json_tools_menu.png · export_json_to_folder.png
Written: 2026-07-26