# ruyo/VRM4U

Runtime VRM loader for UnrealEngine5

Repository: https://github.com/ruyo/VRM4U
Canonical: https://ross.abutalabs.com/products/vrm4u
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-08-26T17:01:26+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 94, longevity 100
- inputs: {"age_days": 2888, "days_push": 7, "days_rel": 42, "gap_med": 20, "n_releases_24m": 30}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1945, forks 231 (observed 2026-08-28T04:05:57.681343+00:00)

## What it is
VRM4U is an Unreal Engine (UE4/UE5) plugin that imports VRM 3D avatar files at runtime and in-editor. It generates skeletal rigs, morph targets, spring bones, and MToon-style anime materials so VRM characters render correctly within Unreal Engine scenes.

## Use cases
- load VRM avatar models in Unreal Engine 5
- render anime-style characters with MToon shading in UE5
- retarget humanoid animations onto VRM characters
- use VRM models on mobile with skeletal mesh reduction
- import VRM spring bones and blend shapes into Unreal
- display VRM characters in PBR scenes without post-processing

## When to choose
- you need to use VRM avatars inside Unreal Engine 4 or 5
- you want anime/toon-shaded characters with outlines and MatCap in UE
- you need runtime VRM loading in a shipped UE game
- you target Windows, Mac, or mobile platforms in Unreal

## When to avoid
- you use Unity, Godot, or another engine instead of Unreal Engine
- you need PBR-accurate character rendering rather than toon shading
- you require commercial support or guaranteed response times (it is a solo-maintained project)
- you need UE versions older than 4.20 with full material support

## Facets
- artifact type: plugin
- maturity: active
- function: graphics, animation, image-processing, sdk
- domain: graphics, cross-platform
- platform: windows, cpp, game-engine
- tags: unreal-engine, vrm, 3d-model-import, anime-style-rendering, mtoon, spring-bone, vtuber, game-development, macos, android, ios

## Member repositories
- ruyo/VRM4U (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:57.681343+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:07:58.633807+00:00, confidence not recorded.
  - readme: https://github.com/ruyo/VRM4U (fetched 2026-08-28T04:05:57.681343+00:00, sha 51b9b1c9c18a)
- Data as of 2026-08-30T08:39:29.467469+00:00.