VRMKit

VRM loader and VRM renderer

For "VRM", please refer to this page.

Features

• Load VRM file
• Render VRM models on RealityKit (experimental)
• Face morphing (blend shape)
• Bone animation (skin / joint)
• Physics (spring bone)

Requirements

• Swift 5.9+
• iOS 15.0+
• visionOS 2.0+
• watchOS 8.0+ (Experimental)

Installation

Swift Package Manager

You can install this package with Swift Package Manager.

Carthage & CocoaPods (Deprecated)

If you want to use these package managers, please use https://github.com/tattn/VRMKit/releases/tag/0.4.2

Usage

Load VRM

import VRMKit

let vrm = try VRMLoader().load(named: "model.vrm")
// let vrm = try VRMLoader().load(withUrl: URL(string: "/path/to/model.vrm")!)
// let vrm = try VRMLoader().load(withData: data)

// VRM meta data
vrm.meta.title
vrm.meta.author

// model data
vrm.gltf.jsonData.nodes[0].name

Render VRM

import RealityKit
import VRMKit
import VRMRealityKit

let loader = try VRMEntityLoader(named: "model.vrm")
let vrmEntity = try loader.loadEntity()

let arView = ARView(frame: .zero, cameraMode: .nonAR, automaticallyConfigureSession: false)
let anchor = AnchorEntity(world: .zero)
anchor.addChild(vrmEntity.entity)
arView.scene.addAnchor(anchor)

Render VRM (SwiftUI)

import RealityKit
import RealityKitContent
import VRMKit
import VRMRealityKit

import SwiftUI

struct ContentView: View {
    var body: some View {
        RealityView { content in
            let loader = try VRMEntityLoader(named: "model.vrm")
            let vrmEntity = try loader.loadEntity()
            content.add(vrmEntity.entity)
        }
    }
}

Render VRM (SceneKit) — Deprecated

Note: VRMSceneKit is deprecated. Use VRMRealityKit instead.

import VRMKit
import VRMSceneKit

@IBOutlet weak var sceneView: SCNView!

let loader = try VRMSceneLoader(named: "model.vrm")
let scene: VRMScene = try loader.loadScene()
let node: VRMNode = scene.vrmNode

sceneView.scene = scene

Blend shapes

vrmEntity.setBlendShape(value: 1.0, for: .preset(.joy))

vrmEntity.setBlendShape(value: 1.0, for: .preset(.angry))

vrmEntity.setBlendShape(value: 1.0, for: .custom("><"))

Bone animation

vrmEntity.setBlendShape(value: 1.0, for: .preset(.fun))
let neckRotation = simd_quatf(angle: 20 * .pi / 180, axis: SIMD3<Float>(0, 0, 1))
let shoulderRotation = simd_quatf(angle: 40 * .pi / 180, axis: SIMD3<Float>(0, 0, 1))
vrmEntity.humanoid.node(for: .neck)?.transform.rotation *= neckRotation
vrmEntity.humanoid.node(for: .leftShoulder)?.transform.rotation *= shoulderRotation
vrmEntity.humanoid.node(for: .rightShoulder)?.transform.rotation *= shoulderRotation

Read the thumbnail image

let loader = try VRMEntityLoader(named: "model.vrm")
let image = try loader.loadThumbnail()

ToDo

• VRM 1.0 support
  • Decoding VRM 1.0 file
  • Render an avatar by RealityKit
• VRM shaders support
• Improve rendering quality
• Animation support
• VRM editing function
• GLTF renderer support

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

Support this project

Donating to help me continue working on this project.

License

VRMKit is released under the MIT license. See LICENSE for details.

Author

Tatsuya Tanaka