2020-04-21 17:12:49 +0900 +0900
Last modified August 1, 2020: Follow redirects in vrm_applications (f504c33)

Available in https://github.com/vrm-c/UniVRM_1_0/blob/master/Assets/UniVRM-1.0/PlayModeTests/ApiSampleTests.cs

using System;
using System.IO;
using UnityEngine;

VRM to Model

        VrmLib.Model ReadModel(string path)
            var bytes = File.ReadAllBytes(path);

            if (!VrmLib.Glb.TryParse(bytes, out VrmLib.Glb glb, out Exception ex))
                Debug.LogError($"fail to Glb.TryParse: {path} => {ex}");
                return null;

            // both VRM-0.X and VRM-1.0
            var model = UniVRM10.VrmLoader.CreateVrmModel(path); 
            return model;

This is possible on a thread

return Task.Run(()=>{
    return ReadModel(path);

Model to GameObject

This requires a ScriptThread.

        ModelAsset BuildGameObject(VrmLib.Model model, bool showMesh)
            var importer = new UniVRM10.RuntimeUnityBuilder();
            var assets = importer.ToUnityAsset(model, showMesh);
            UniVRM10.ComponentBuilder.Build10(model, importer, assets);
            return assets;

Set renderer after importing the model

Various assets now are stored in ModelAsset.

            var asset = BuildGameObject(srcModel, false);

            // renderer setting
            foreach (var render in asset.Renderers)
                // show when RuntimeUnityBuilder.ToUnity(showMesh = false)
                render.enabled = true;
                // avoid culling
                if (render is SkinnedMeshRenderer skinned)
                    skinned.updateWhenOffscreen = true;

Tackle on frame rate dropping (TODO)

Optimize the processing of each frame to reduce spikes.

GameObject to Model

        VrmLib.Model ToModel(UnityEngine.GameObject target)
            var exporter = new UniVRM10.RuntimeVrmConverter();
            var model = exporter.ToModelFrom10(target);
            return model;

Model to VRM

        byte[] ToVrm10(VrmLib.Model model)
            // transform to right-handed coordinate system
            VrmLib.ModelExtensionsForCoordinates.ConvertCoordinate(model, VrmLib.Coordinates.Gltf);
            var bytes = Vrm10.ModelExtensions.ToGlb(model);
            return bytes;

VRM - humanoid 3d avatar format for VR