private async Task <IList <Asset> > LoadAssetsFromGLTF(AssetSource source, Guid containerId, ColliderType colliderType)
{
WebRequestLoader loader = null;
Stream stream = null;
source.ParsedUri = new Uri(_app.ServerAssetUri, source.ParsedUri);
var rootUri = URIHelper.GetDirectoryName(source.ParsedUri.AbsoluteUri);
var cachedVersion = MREAPI.AppsAPI.AssetCache.SupportsSync ?
MREAPI.AppsAPI.AssetCache.GetVersionSync(source.ParsedUri) :
await MREAPI.AppsAPI.AssetCache.GetVersion(source.ParsedUri);
// Wait asynchronously until the load throttler lets us through.
using (var scope = await AssetLoadThrottling.AcquireLoadScope())
{
// set up loader
loader = new WebRequestLoader(rootUri);
if (!string.IsNullOrEmpty(cachedVersion))
{
loader.BeforeRequestCallback += (msg) =>
{
if (msg.RequestUri == source.ParsedUri)
{
msg.Headers.Add("If-None-Match", cachedVersion);
}
};
}
// download root gltf file, check for cache hit
try
{
stream = await loader.LoadStreamAsync(URIHelper.GetFileFromUri(source.ParsedUri));
source.Version = loader.LastResponse.Headers.ETag?.Tag ?? "";
}
catch (HttpRequestException)
{
if (loader.LastResponse.StatusCode == System.Net.HttpStatusCode.NotModified)
{
source.Version = cachedVersion;
}
else
{
throw;
}
}
}
IList <Asset> assetDefs = new List <Asset>(30);
DeterministicGuids guidGenerator = new DeterministicGuids(UtilMethods.StringToGuid(
$"{containerId}:{source.ParsedUri.AbsoluteUri}"));
IList <UnityEngine.Object> assets;
// fetch assets from glTF stream or cache
if (source.Version != cachedVersion)
{
assets = await LoadGltfFromStream(loader, stream, colliderType);
MREAPI.AppsAPI.AssetCache.StoreAssets(source.ParsedUri, assets, source.Version);
}
else
{
var assetsEnum = MREAPI.AppsAPI.AssetCache.SupportsSync ?
MREAPI.AppsAPI.AssetCache.LeaseAssetsSync(source.ParsedUri) :
await MREAPI.AppsAPI.AssetCache.LeaseAssets(source.ParsedUri);
assets = assetsEnum.ToList();
}
// catalog assets
int textureIndex = 0, meshIndex = 0, materialIndex = 0, prefabIndex = 0;
foreach (var asset in assets)
{
var assetDef = GenerateAssetPatch(asset, guidGenerator.Next());
assetDef.Name = asset.name;
string internalId = null;
if (asset is UnityEngine.Texture)
{
internalId = $"texture:{textureIndex++}";
}
else if (asset is UnityEngine.Mesh)
{
internalId = $"mesh:{meshIndex++}";
}
else if (asset is UnityEngine.Material)
{
internalId = $"material:{materialIndex++}";
}
else if (asset is GameObject)
{
internalId = $"scene:{prefabIndex++}";
}
assetDef.Source = new AssetSource(source.ContainerType, source.ParsedUri.AbsoluteUri, internalId, source.Version);
ColliderGeometry colliderGeo = null;
if (asset is UnityEngine.Mesh mesh)
{
colliderGeo = colliderType == ColliderType.Mesh ?
(ColliderGeometry) new MeshColliderGeometry()
{
MeshId = assetDef.Id
} :
(ColliderGeometry) new BoxColliderGeometry()
{
Size = (mesh.bounds.size * 0.8f).CreateMWVector3(),
Center = mesh.bounds.center.CreateMWVector3()
};
}
_app.AssetManager.Set(assetDef.Id, containerId, asset, colliderGeo, assetDef.Source);
assetDefs.Add(assetDef);
}
return(assetDefs);
}
private async Task <IList <Asset> > LoadAssetsFromGLTF(AssetSource source, Guid containerId, ColliderType colliderType)
{
WebRequestLoader loader = null;
Stream stream = null;
IList <Asset> assets = new List <Asset>();
DeterministicGuids guidGenerator = new DeterministicGuids(UtilMethods.StringToGuid(
$"{containerId}:{source.ParsedUri.AbsoluteUri}"));
// Wait asynchronously until the load throttler lets us through.
using (var scope = await AssetLoadThrottling.AcquireLoadScope())
{
// download file
var rootUrl = URIHelper.GetDirectoryName(source.ParsedUri.AbsoluteUri);
loader = new WebRequestLoader(rootUrl);
stream = await loader.LoadStreamAsync(URIHelper.GetFileFromUri(source.ParsedUri));
}
// pre-parse glTF document so we can get a scene count
// run this on a threadpool thread so that the Unity main thread is not blocked
GLTF.Schema.GLTFRoot gltfRoot = null;
try
{
await Task.Run(() =>
{
GLTF.GLTFParser.ParseJson(stream, out gltfRoot);
});
}
catch (Exception e)
{
Debug.LogError(e);
}
if (gltfRoot == null)
{
throw new GLTFLoadException("Failed to parse glTF");
}
stream.Position = 0;
using (GLTFSceneImporter importer =
MREAPI.AppsAPI.GLTFImporterFactory.CreateImporter(gltfRoot, loader, _asyncHelper, stream))
{
importer.SceneParent = _app.AssetCache.CacheRootGO().transform;
importer.Collider = colliderType.ToGLTFColliderType();
// load textures
if (gltfRoot.Textures != null)
{
for (var i = 0; i < gltfRoot.Textures.Count; i++)
{
await importer.LoadTextureAsync(gltfRoot.Textures[i], i, true);
var texture = importer.GetTexture(i);
texture.name = gltfRoot.Textures[i].Name ?? $"texture:{i}";
var asset = GenerateAssetPatch(texture, guidGenerator.Next());
asset.Name = texture.name;
asset.Source = new AssetSource(source.ContainerType, source.Uri, $"texture:{i}");
_app.AssetCache.CacheAsset(texture, asset.Id, containerId, source);
assets.Add(asset);
}
}
// load meshes
if (gltfRoot.Meshes != null)
{
var cancellationSource = new System.Threading.CancellationTokenSource();
for (var i = 0; i < gltfRoot.Meshes.Count; i++)
{
var mesh = await importer.LoadMeshAsync(i, cancellationSource.Token);
mesh.name = gltfRoot.Meshes[i].Name ?? $"mesh:{i}";
var asset = GenerateAssetPatch(mesh, guidGenerator.Next());
asset.Name = mesh.name;
asset.Source = new AssetSource(source.ContainerType, source.Uri, $"mesh:{i}");
var colliderGeo = colliderType == ColliderType.Mesh ?
(ColliderGeometry) new MeshColliderGeometry()
{
MeshId = asset.Id
} :
(ColliderGeometry) new BoxColliderGeometry()
{
Size = (mesh.bounds.size * 0.8f).CreateMWVector3()
};
_app.AssetCache.CacheAsset(mesh, asset.Id, containerId, source, colliderGeo);
assets.Add(asset);
}
}
// load materials
if (gltfRoot.Materials != null)
{
for (var i = 0; i < gltfRoot.Materials.Count; i++)
{
var matdef = gltfRoot.Materials[i];
var material = await importer.LoadMaterialAsync(i);
material.name = matdef.Name ?? $"material:{i}";
var asset = GenerateAssetPatch(material, guidGenerator.Next());
asset.Name = material.name;
asset.Source = new AssetSource(source.ContainerType, source.Uri, $"material:{i}");
_app.AssetCache.CacheAsset(material, asset.Id, containerId, source);
assets.Add(asset);
}
}
// load prefabs
if (gltfRoot.Scenes != null)
{
for (var i = 0; i < gltfRoot.Scenes.Count; i++)
{
await importer.LoadSceneAsync(i).ConfigureAwait(true);
GameObject rootObject = importer.LastLoadedScene;
rootObject.name = gltfRoot.Scenes[i].Name ?? $"scene:{i}";
var animation = rootObject.GetComponent <UnityEngine.Animation>();
if (animation != null)
{
animation.playAutomatically = false;
// initialize mapping so we know which gameobjects are targeted by which animation clips
var mapping = rootObject.AddComponent <PrefabAnimationTargets>();
mapping.Initialize(gltfRoot, i);
}
MWGOTreeWalker.VisitTree(rootObject, (go) =>
{
go.layer = MREAPI.AppsAPI.LayerApplicator.DefaultLayer;
});
var def = GenerateAssetPatch(rootObject, guidGenerator.Next());
def.Name = rootObject.name;
def.Source = new AssetSource(source.ContainerType, source.Uri, $"scene:{i}");
_app.AssetCache.CacheAsset(rootObject, def.Id, containerId, source);
assets.Add(def);
}
}
}
return(assets);
}
