| 1 |
- {"ast":null,"code":"import { Observable } from \"@babylonjs/core/Misc/observable.js\";\nimport { Deferred } from \"@babylonjs/core/Misc/deferred.js\";\nimport { GLTFLoader, ArrayItem } from \"../glTFLoader.js\";\nconst NAME = \"MSFT_lod\";\n/**\n * [Specification](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MSFT_lod/README.md)\n */\n// eslint-disable-next-line @typescript-eslint/naming-convention\nexport class MSFT_lod {\n /**\n * @internal\n */\n constructor(loader) {\n /**\n * The name of this extension.\n */\n this.name = NAME;\n /**\n * Defines a number that determines the order the extensions are applied.\n */\n this.order = 100;\n /**\n * Maximum number of LODs to load, starting from the lowest LOD.\n */\n this.maxLODsToLoad = 10;\n /**\n * Observable raised when all node LODs of one level are loaded.\n * The event data is the index of the loaded LOD starting from zero.\n * Dispose the loader to cancel the loading of the next level of LODs.\n */\n this.onNodeLODsLoadedObservable = new Observable();\n /**\n * Observable raised when all material LODs of one level are loaded.\n * The event data is the index of the loaded LOD starting from zero.\n * Dispose the loader to cancel the loading of the next level of LODs.\n */\n this.onMaterialLODsLoadedObservable = new Observable();\n this._bufferLODs = new Array();\n this._nodeIndexLOD = null;\n this._nodeSignalLODs = new Array();\n this._nodePromiseLODs = new Array();\n this._nodeBufferLODs = new Array();\n this._materialIndexLOD = null;\n this._materialSignalLODs = new Array();\n this._materialPromiseLODs = new Array();\n this._materialBufferLODs = new Array();\n this._loader = loader;\n this.enabled = this._loader.isExtensionUsed(NAME);\n }\n /** @internal */\n dispose() {\n this._loader = null;\n this._nodeIndexLOD = null;\n this._nodeSignalLODs.length = 0;\n this._nodePromiseLODs.length = 0;\n this._nodeBufferLODs.length = 0;\n this._materialIndexLOD = null;\n this._materialSignalLODs.length = 0;\n this._materialPromiseLODs.length = 0;\n this._materialBufferLODs.length = 0;\n this.onMaterialLODsLoadedObservable.clear();\n this.onNodeLODsLoadedObservable.clear();\n }\n /** @internal */\n onReady() {\n for (let indexLOD = 0; indexLOD < this._nodePromiseLODs.length; indexLOD++) {\n const promise = Promise.all(this._nodePromiseLODs[indexLOD]).then(() => {\n if (indexLOD !== 0) {\n this._loader.endPerformanceCounter(`Node LOD ${indexLOD}`);\n this._loader.log(`Loaded node LOD ${indexLOD}`);\n }\n this.onNodeLODsLoadedObservable.notifyObservers(indexLOD);\n if (indexLOD !== this._nodePromiseLODs.length - 1) {\n this._loader.startPerformanceCounter(`Node LOD ${indexLOD + 1}`);\n this._loadBufferLOD(this._nodeBufferLODs, indexLOD + 1);\n if (this._nodeSignalLODs[indexLOD]) {\n this._nodeSignalLODs[indexLOD].resolve();\n }\n }\n });\n this._loader._completePromises.push(promise);\n }\n for (let indexLOD = 0; indexLOD < this._materialPromiseLODs.length; indexLOD++) {\n const promise = Promise.all(this._materialPromiseLODs[indexLOD]).then(() => {\n if (indexLOD !== 0) {\n this._loader.endPerformanceCounter(`Material LOD ${indexLOD}`);\n this._loader.log(`Loaded material LOD ${indexLOD}`);\n }\n this.onMaterialLODsLoadedObservable.notifyObservers(indexLOD);\n if (indexLOD !== this._materialPromiseLODs.length - 1) {\n this._loader.startPerformanceCounter(`Material LOD ${indexLOD + 1}`);\n this._loadBufferLOD(this._materialBufferLODs, indexLOD + 1);\n if (this._materialSignalLODs[indexLOD]) {\n this._materialSignalLODs[indexLOD].resolve();\n }\n }\n });\n this._loader._completePromises.push(promise);\n }\n }\n /**\n * @internal\n */\n loadSceneAsync(context, scene) {\n const promise = this._loader.loadSceneAsync(context, scene);\n this._loadBufferLOD(this._bufferLODs, 0);\n return promise;\n }\n /**\n * @internal\n */\n loadNodeAsync(context, node, assign) {\n return GLTFLoader.LoadExtensionAsync(context, node, this.name, (extensionContext, extension) => {\n let firstPromise;\n const nodeLODs = this._getLODs(extensionContext, node, this._loader.gltf.nodes, extension.ids);\n this._loader.logOpen(`${extensionContext}`);\n for (let indexLOD = 0; indexLOD < nodeLODs.length; indexLOD++) {\n const nodeLOD = nodeLODs[indexLOD];\n if (indexLOD !== 0) {\n this._nodeIndexLOD = indexLOD;\n this._nodeSignalLODs[indexLOD] = this._nodeSignalLODs[indexLOD] || new Deferred();\n }\n const assignWrap = babylonTransformNode => {\n assign(babylonTransformNode);\n babylonTransformNode.setEnabled(false);\n };\n const promise = this._loader.loadNodeAsync(`/nodes/${nodeLOD.index}`, nodeLOD, assignWrap).then(babylonMesh => {\n if (indexLOD !== 0) {\n // TODO: should not rely on _babylonTransformNode\n const previousNodeLOD = nodeLODs[indexLOD - 1];\n if (previousNodeLOD._babylonTransformNode) {\n this._disposeTransformNode(previousNodeLOD._babylonTransformNode);\n delete previousNodeLOD._babylonTransformNode;\n }\n }\n babylonMesh.setEnabled(true);\n return babylonMesh;\n });\n this._nodePromiseLODs[indexLOD] = this._nodePromiseLODs[indexLOD] || [];\n if (indexLOD === 0) {\n firstPromise = promise;\n } else {\n this._nodeIndexLOD = null;\n this._nodePromiseLODs[indexLOD].push(promise);\n }\n }\n this._loader.logClose();\n return firstPromise;\n });\n }\n /**\n * @internal\n */\n _loadMaterialAsync(context, material, babylonMesh, babylonDrawMode, assign) {\n // Don't load material LODs if already loading a node LOD.\n if (this._nodeIndexLOD) {\n return null;\n }\n return GLTFLoader.LoadExtensionAsync(context, material, this.name, (extensionContext, extension) => {\n let firstPromise;\n const materialLODs = this._getLODs(extensionContext, material, this._loader.gltf.materials, extension.ids);\n this._loader.logOpen(`${extensionContext}`);\n for (let indexLOD = 0; indexLOD < materialLODs.length; indexLOD++) {\n const materialLOD = materialLODs[indexLOD];\n if (indexLOD !== 0) {\n this._materialIndexLOD = indexLOD;\n }\n const promise = this._loader._loadMaterialAsync(`/materials/${materialLOD.index}`, materialLOD, babylonMesh, babylonDrawMode, babylonMaterial => {\n if (indexLOD === 0) {\n assign(babylonMaterial);\n }\n }).then(babylonMaterial => {\n if (indexLOD !== 0) {\n assign(babylonMaterial);\n // TODO: should not rely on _data\n const previousDataLOD = materialLODs[indexLOD - 1]._data;\n if (previousDataLOD[babylonDrawMode]) {\n this._disposeMaterials([previousDataLOD[babylonDrawMode].babylonMaterial]);\n delete previousDataLOD[babylonDrawMode];\n }\n }\n return babylonMaterial;\n });\n this._materialPromiseLODs[indexLOD] = this._materialPromiseLODs[indexLOD] || [];\n if (indexLOD === 0) {\n firstPromise = promise;\n } else {\n this._materialIndexLOD = null;\n this._materialPromiseLODs[indexLOD].push(promise);\n }\n }\n this._loader.logClose();\n return firstPromise;\n });\n }\n /**\n * @internal\n */\n _loadUriAsync(context, property, uri) {\n // Defer the loading of uris if loading a node or material LOD.\n if (this._nodeIndexLOD !== null) {\n this._loader.log(`deferred`);\n const previousIndexLOD = this._nodeIndexLOD - 1;\n this._nodeSignalLODs[previousIndexLOD] = this._nodeSignalLODs[previousIndexLOD] || new Deferred();\n return this._nodeSignalLODs[this._nodeIndexLOD - 1].promise.then(() => {\n return this._loader.loadUriAsync(context, property, uri);\n });\n } else if (this._materialIndexLOD !== null) {\n this._loader.log(`deferred`);\n const previousIndexLOD = this._materialIndexLOD - 1;\n this._materialSignalLODs[previousIndexLOD] = this._materialSignalLODs[previousIndexLOD] || new Deferred();\n return this._materialSignalLODs[previousIndexLOD].promise.then(() => {\n return this._loader.loadUriAsync(context, property, uri);\n });\n }\n return null;\n }\n /**\n * @internal\n */\n loadBufferAsync(context, buffer, byteOffset, byteLength) {\n if (this._loader.parent.useRangeRequests && !buffer.uri) {\n if (!this._loader.bin) {\n throw new Error(`${context}: Uri is missing or the binary glTF is missing its binary chunk`);\n }\n const loadAsync = (bufferLODs, indexLOD) => {\n const start = byteOffset;\n const end = start + byteLength - 1;\n let bufferLOD = bufferLODs[indexLOD];\n if (bufferLOD) {\n bufferLOD.start = Math.min(bufferLOD.start, start);\n bufferLOD.end = Math.max(bufferLOD.end, end);\n } else {\n bufferLOD = {\n start: start,\n end: end,\n loaded: new Deferred()\n };\n bufferLODs[indexLOD] = bufferLOD;\n }\n return bufferLOD.loaded.promise.then(data => {\n return new Uint8Array(data.buffer, data.byteOffset + byteOffset - bufferLOD.start, byteLength);\n });\n };\n this._loader.log(`deferred`);\n if (this._nodeIndexLOD !== null) {\n return loadAsync(this._nodeBufferLODs, this._nodeIndexLOD);\n } else if (this._materialIndexLOD !== null) {\n return loadAsync(this._materialBufferLODs, this._materialIndexLOD);\n } else {\n return loadAsync(this._bufferLODs, 0);\n }\n }\n return null;\n }\n _loadBufferLOD(bufferLODs, indexLOD) {\n const bufferLOD = bufferLODs[indexLOD];\n if (bufferLOD) {\n this._loader.log(`Loading buffer range [${bufferLOD.start}-${bufferLOD.end}]`);\n this._loader.bin.readAsync(bufferLOD.start, bufferLOD.end - bufferLOD.start + 1).then(data => {\n bufferLOD.loaded.resolve(data);\n }, error => {\n bufferLOD.loaded.reject(error);\n });\n }\n }\n /**\n * @returns an array of LOD properties from lowest to highest.\n * @param context\n * @param property\n * @param array\n * @param ids\n */\n _getLODs(context, property, array, ids) {\n if (this.maxLODsToLoad <= 0) {\n throw new Error(\"maxLODsToLoad must be greater than zero\");\n }\n const properties = [];\n for (let i = ids.length - 1; i >= 0; i--) {\n properties.push(ArrayItem.Get(`${context}/ids/${ids[i]}`, array, ids[i]));\n if (properties.length === this.maxLODsToLoad) {\n return properties;\n }\n }\n properties.push(property);\n return properties;\n }\n _disposeTransformNode(babylonTransformNode) {\n const babylonMaterials = [];\n const babylonMaterial = babylonTransformNode.material;\n if (babylonMaterial) {\n babylonMaterials.push(babylonMaterial);\n }\n for (const babylonMesh of babylonTransformNode.getChildMeshes()) {\n if (babylonMesh.material) {\n babylonMaterials.push(babylonMesh.material);\n }\n }\n babylonTransformNode.dispose();\n const babylonMaterialsToDispose = babylonMaterials.filter(babylonMaterial => this._loader.babylonScene.meshes.every(mesh => mesh.material != babylonMaterial));\n this._disposeMaterials(babylonMaterialsToDispose);\n }\n _disposeMaterials(babylonMaterials) {\n const babylonTextures = {};\n for (const babylonMaterial of babylonMaterials) {\n for (const babylonTexture of babylonMaterial.getActiveTextures()) {\n babylonTextures[babylonTexture.uniqueId] = babylonTexture;\n }\n babylonMaterial.dispose();\n }\n for (const uniqueId in babylonTextures) {\n for (const babylonMaterial of this._loader.babylonScene.materials) {\n if (babylonMaterial.hasTexture(babylonTextures[uniqueId])) {\n delete babylonTextures[uniqueId];\n }\n }\n }\n for (const uniqueId in babylonTextures) {\n babylonTextures[uniqueId].dispose();\n }\n }\n}\nGLTFLoader.RegisterExtension(NAME, loader => new MSFT_lod(loader));","map":{"version":3,"names":["Observable","Deferred","GLTFLoader","ArrayItem","NAME","MSFT_lod","constructor","loader","name","order","maxLODsToLoad","onNodeLODsLoadedObservable","onMaterialLODsLoadedObservable","_bufferLODs","Array","_nodeIndexLOD","_nodeSignalLODs","_nodePromiseLODs","_nodeBufferLODs","_materialIndexLOD","_materialSignalLODs","_materialPromiseLODs","_materialBufferLODs","_loader","enabled","isExtensionUsed","dispose","length","clear","onReady","indexLOD","promise","Promise","all","then","endPerformanceCounter","log","notifyObservers","startPerformanceCounter","_loadBufferLOD","resolve","_completePromises","push","loadSceneAsync","context","scene","loadNodeAsync","node","assign","LoadExtensionAsync","extensionContext","extension","firstPromise","nodeLODs","_getLODs","gltf","nodes","ids","logOpen","nodeLOD","assignWrap","babylonTransformNode","setEnabled","index","babylonMesh","previousNodeLOD","_babylonTransformNode","_disposeTransformNode","logClose","_loadMaterialAsync","material","babylonDrawMode","materialLODs","materials","materialLOD","babylonMaterial","previousDataLOD","_data","_disposeMaterials","_loadUriAsync","property","uri","previousIndexLOD","loadUriAsync","loadBufferAsync","buffer","byteOffset","byteLength","parent","useRangeRequests","bin","Error","loadAsync","bufferLODs","start","end","bufferLOD","Math","min","max","loaded","data","Uint8Array","readAsync","error","reject","array","properties","i","Get","babylonMaterials","getChildMeshes","babylonMaterialsToDispose","filter","babylonScene","meshes","every","mesh","babylonTextures","babylonTexture","getActiveTextures","uniqueId","hasTexture","RegisterExtension"],"sources":["F:/workspace/202226701027/huinongbao-app/node_modules/@babylonjs/loaders/glTF/2.0/Extensions/MSFT_lod.js"],"sourcesContent":["import { Observable } from \"@babylonjs/core/Misc/observable.js\";\nimport { Deferred } from \"@babylonjs/core/Misc/deferred.js\";\nimport { GLTFLoader, ArrayItem } from \"../glTFLoader.js\";\nconst NAME = \"MSFT_lod\";\n/**\n * [Specification](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/MSFT_lod/README.md)\n */\n// eslint-disable-next-line @typescript-eslint/naming-convention\nexport class MSFT_lod {\n /**\n * @internal\n */\n constructor(loader) {\n /**\n * The name of this extension.\n */\n this.name = NAME;\n /**\n * Defines a number that determines the order the extensions are applied.\n */\n this.order = 100;\n /**\n * Maximum number of LODs to load, starting from the lowest LOD.\n */\n this.maxLODsToLoad = 10;\n /**\n * Observable raised when all node LODs of one level are loaded.\n * The event data is the index of the loaded LOD starting from zero.\n * Dispose the loader to cancel the loading of the next level of LODs.\n */\n this.onNodeLODsLoadedObservable = new Observable();\n /**\n * Observable raised when all material LODs of one level are loaded.\n * The event data is the index of the loaded LOD starting from zero.\n * Dispose the loader to cancel the loading of the next level of LODs.\n */\n this.onMaterialLODsLoadedObservable = new Observable();\n this._bufferLODs = new Array();\n this._nodeIndexLOD = null;\n this._nodeSignalLODs = new Array();\n this._nodePromiseLODs = new Array();\n this._nodeBufferLODs = new Array();\n this._materialIndexLOD = null;\n this._materialSignalLODs = new Array();\n this._materialPromiseLODs = new Array();\n this._materialBufferLODs = new Array();\n this._loader = loader;\n this.enabled = this._loader.isExtensionUsed(NAME);\n }\n /** @internal */\n dispose() {\n this._loader = null;\n this._nodeIndexLOD = null;\n this._nodeSignalLODs.length = 0;\n this._nodePromiseLODs.length = 0;\n this._nodeBufferLODs.length = 0;\n this._materialIndexLOD = null;\n this._materialSignalLODs.length = 0;\n this._materialPromiseLODs.length = 0;\n this._materialBufferLODs.length = 0;\n this.onMaterialLODsLoadedObservable.clear();\n this.onNodeLODsLoadedObservable.clear();\n }\n /** @internal */\n onReady() {\n for (let indexLOD = 0; indexLOD < this._nodePromiseLODs.length; indexLOD++) {\n const promise = Promise.all(this._nodePromiseLODs[indexLOD]).then(() => {\n if (indexLOD !== 0) {\n this._loader.endPerformanceCounter(`Node LOD ${indexLOD}`);\n this._loader.log(`Loaded node LOD ${indexLOD}`);\n }\n this.onNodeLODsLoadedObservable.notifyObservers(indexLOD);\n if (indexLOD !== this._nodePromiseLODs.length - 1) {\n this._loader.startPerformanceCounter(`Node LOD ${indexLOD + 1}`);\n this._loadBufferLOD(this._nodeBufferLODs, indexLOD + 1);\n if (this._nodeSignalLODs[indexLOD]) {\n this._nodeSignalLODs[indexLOD].resolve();\n }\n }\n });\n this._loader._completePromises.push(promise);\n }\n for (let indexLOD = 0; indexLOD < this._materialPromiseLODs.length; indexLOD++) {\n const promise = Promise.all(this._materialPromiseLODs[indexLOD]).then(() => {\n if (indexLOD !== 0) {\n this._loader.endPerformanceCounter(`Material LOD ${indexLOD}`);\n this._loader.log(`Loaded material LOD ${indexLOD}`);\n }\n this.onMaterialLODsLoadedObservable.notifyObservers(indexLOD);\n if (indexLOD !== this._materialPromiseLODs.length - 1) {\n this._loader.startPerformanceCounter(`Material LOD ${indexLOD + 1}`);\n this._loadBufferLOD(this._materialBufferLODs, indexLOD + 1);\n if (this._materialSignalLODs[indexLOD]) {\n this._materialSignalLODs[indexLOD].resolve();\n }\n }\n });\n this._loader._completePromises.push(promise);\n }\n }\n /**\n * @internal\n */\n loadSceneAsync(context, scene) {\n const promise = this._loader.loadSceneAsync(context, scene);\n this._loadBufferLOD(this._bufferLODs, 0);\n return promise;\n }\n /**\n * @internal\n */\n loadNodeAsync(context, node, assign) {\n return GLTFLoader.LoadExtensionAsync(context, node, this.name, (extensionContext, extension) => {\n let firstPromise;\n const nodeLODs = this._getLODs(extensionContext, node, this._loader.gltf.nodes, extension.ids);\n this._loader.logOpen(`${extensionContext}`);\n for (let indexLOD = 0; indexLOD < nodeLODs.length; indexLOD++) {\n const nodeLOD = nodeLODs[indexLOD];\n if (indexLOD !== 0) {\n this._nodeIndexLOD = indexLOD;\n this._nodeSignalLODs[indexLOD] = this._nodeSignalLODs[indexLOD] || new Deferred();\n }\n const assignWrap = (babylonTransformNode) => {\n assign(babylonTransformNode);\n babylonTransformNode.setEnabled(false);\n };\n const promise = this._loader.loadNodeAsync(`/nodes/${nodeLOD.index}`, nodeLOD, assignWrap).then((babylonMesh) => {\n if (indexLOD !== 0) {\n // TODO: should not rely on _babylonTransformNode\n const previousNodeLOD = nodeLODs[indexLOD - 1];\n if (previousNodeLOD._babylonTransformNode) {\n this._disposeTransformNode(previousNodeLOD._babylonTransformNode);\n delete previousNodeLOD._babylonTransformNode;\n }\n }\n babylonMesh.setEnabled(true);\n return babylonMesh;\n });\n this._nodePromiseLODs[indexLOD] = this._nodePromiseLODs[indexLOD] || [];\n if (indexLOD === 0) {\n firstPromise = promise;\n }\n else {\n this._nodeIndexLOD = null;\n this._nodePromiseLODs[indexLOD].push(promise);\n }\n }\n this._loader.logClose();\n return firstPromise;\n });\n }\n /**\n * @internal\n */\n _loadMaterialAsync(context, material, babylonMesh, babylonDrawMode, assign) {\n // Don't load material LODs if already loading a node LOD.\n if (this._nodeIndexLOD) {\n return null;\n }\n return GLTFLoader.LoadExtensionAsync(context, material, this.name, (extensionContext, extension) => {\n let firstPromise;\n const materialLODs = this._getLODs(extensionContext, material, this._loader.gltf.materials, extension.ids);\n this._loader.logOpen(`${extensionContext}`);\n for (let indexLOD = 0; indexLOD < materialLODs.length; indexLOD++) {\n const materialLOD = materialLODs[indexLOD];\n if (indexLOD !== 0) {\n this._materialIndexLOD = indexLOD;\n }\n const promise = this._loader\n ._loadMaterialAsync(`/materials/${materialLOD.index}`, materialLOD, babylonMesh, babylonDrawMode, (babylonMaterial) => {\n if (indexLOD === 0) {\n assign(babylonMaterial);\n }\n })\n .then((babylonMaterial) => {\n if (indexLOD !== 0) {\n assign(babylonMaterial);\n // TODO: should not rely on _data\n const previousDataLOD = materialLODs[indexLOD - 1]._data;\n if (previousDataLOD[babylonDrawMode]) {\n this._disposeMaterials([previousDataLOD[babylonDrawMode].babylonMaterial]);\n delete previousDataLOD[babylonDrawMode];\n }\n }\n return babylonMaterial;\n });\n this._materialPromiseLODs[indexLOD] = this._materialPromiseLODs[indexLOD] || [];\n if (indexLOD === 0) {\n firstPromise = promise;\n }\n else {\n this._materialIndexLOD = null;\n this._materialPromiseLODs[indexLOD].push(promise);\n }\n }\n this._loader.logClose();\n return firstPromise;\n });\n }\n /**\n * @internal\n */\n _loadUriAsync(context, property, uri) {\n // Defer the loading of uris if loading a node or material LOD.\n if (this._nodeIndexLOD !== null) {\n this._loader.log(`deferred`);\n const previousIndexLOD = this._nodeIndexLOD - 1;\n this._nodeSignalLODs[previousIndexLOD] = this._nodeSignalLODs[previousIndexLOD] || new Deferred();\n return this._nodeSignalLODs[this._nodeIndexLOD - 1].promise.then(() => {\n return this._loader.loadUriAsync(context, property, uri);\n });\n }\n else if (this._materialIndexLOD !== null) {\n this._loader.log(`deferred`);\n const previousIndexLOD = this._materialIndexLOD - 1;\n this._materialSignalLODs[previousIndexLOD] = this._materialSignalLODs[previousIndexLOD] || new Deferred();\n return this._materialSignalLODs[previousIndexLOD].promise.then(() => {\n return this._loader.loadUriAsync(context, property, uri);\n });\n }\n return null;\n }\n /**\n * @internal\n */\n loadBufferAsync(context, buffer, byteOffset, byteLength) {\n if (this._loader.parent.useRangeRequests && !buffer.uri) {\n if (!this._loader.bin) {\n throw new Error(`${context}: Uri is missing or the binary glTF is missing its binary chunk`);\n }\n const loadAsync = (bufferLODs, indexLOD) => {\n const start = byteOffset;\n const end = start + byteLength - 1;\n let bufferLOD = bufferLODs[indexLOD];\n if (bufferLOD) {\n bufferLOD.start = Math.min(bufferLOD.start, start);\n bufferLOD.end = Math.max(bufferLOD.end, end);\n }\n else {\n bufferLOD = { start: start, end: end, loaded: new Deferred() };\n bufferLODs[indexLOD] = bufferLOD;\n }\n return bufferLOD.loaded.promise.then((data) => {\n return new Uint8Array(data.buffer, data.byteOffset + byteOffset - bufferLOD.start, byteLength);\n });\n };\n this._loader.log(`deferred`);\n if (this._nodeIndexLOD !== null) {\n return loadAsync(this._nodeBufferLODs, this._nodeIndexLOD);\n }\n else if (this._materialIndexLOD !== null) {\n return loadAsync(this._materialBufferLODs, this._materialIndexLOD);\n }\n else {\n return loadAsync(this._bufferLODs, 0);\n }\n }\n return null;\n }\n _loadBufferLOD(bufferLODs, indexLOD) {\n const bufferLOD = bufferLODs[indexLOD];\n if (bufferLOD) {\n this._loader.log(`Loading buffer range [${bufferLOD.start}-${bufferLOD.end}]`);\n this._loader.bin.readAsync(bufferLOD.start, bufferLOD.end - bufferLOD.start + 1).then((data) => {\n bufferLOD.loaded.resolve(data);\n }, (error) => {\n bufferLOD.loaded.reject(error);\n });\n }\n }\n /**\n * @returns an array of LOD properties from lowest to highest.\n * @param context\n * @param property\n * @param array\n * @param ids\n */\n _getLODs(context, property, array, ids) {\n if (this.maxLODsToLoad <= 0) {\n throw new Error(\"maxLODsToLoad must be greater than zero\");\n }\n const properties = [];\n for (let i = ids.length - 1; i >= 0; i--) {\n properties.push(ArrayItem.Get(`${context}/ids/${ids[i]}`, array, ids[i]));\n if (properties.length === this.maxLODsToLoad) {\n return properties;\n }\n }\n properties.push(property);\n return properties;\n }\n _disposeTransformNode(babylonTransformNode) {\n const babylonMaterials = [];\n const babylonMaterial = babylonTransformNode.material;\n if (babylonMaterial) {\n babylonMaterials.push(babylonMaterial);\n }\n for (const babylonMesh of babylonTransformNode.getChildMeshes()) {\n if (babylonMesh.material) {\n babylonMaterials.push(babylonMesh.material);\n }\n }\n babylonTransformNode.dispose();\n const babylonMaterialsToDispose = babylonMaterials.filter((babylonMaterial) => this._loader.babylonScene.meshes.every((mesh) => mesh.material != babylonMaterial));\n this._disposeMaterials(babylonMaterialsToDispose);\n }\n _disposeMaterials(babylonMaterials) {\n const babylonTextures = {};\n for (const babylonMaterial of babylonMaterials) {\n for (const babylonTexture of babylonMaterial.getActiveTextures()) {\n babylonTextures[babylonTexture.uniqueId] = babylonTexture;\n }\n babylonMaterial.dispose();\n }\n for (const uniqueId in babylonTextures) {\n for (const babylonMaterial of this._loader.babylonScene.materials) {\n if (babylonMaterial.hasTexture(babylonTextures[uniqueId])) {\n delete babylonTextures[uniqueId];\n }\n }\n }\n for (const uniqueId in babylonTextures) {\n babylonTextures[uniqueId].dispose();\n }\n }\n}\nGLTFLoader.RegisterExtension(NAME, (loader) => new 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