{"record":{"id":"c879d3d20c771741","repo":"BabylonJS/Babylon.js","slug":"context-uri-is-missing-or-the-binary-gltf-is-m-c879d3","errorCode":null,"errorMessage":"${context}: Uri is missing or the binary glTF is missing its binary chunk","messagePattern":"(.+?): Uri is missing or the binary glTF is missing its binary chunk","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/dev/loaders/src/glTF/2.0/glTFLoader.pure.ts","lineNumber":2055,"sourceCode":"     * Loads a glTF buffer.\r\n     * @param context The context when loading the asset\r\n     * @param buffer The glTF buffer property\r\n     * @param byteOffset The byte offset to use\r\n     * @param byteLength The byte length to use\r\n     * @returns A promise that resolves with the loaded data when the load is complete\r\n     */\r\n    public loadBufferAsync(context: string, buffer: IBuffer, byteOffset: number, byteLength: number): Promise<ArrayBufferView> {\r\n        const extensionPromise = this._extensionsLoadBufferAsync(context, buffer, byteOffset, byteLength);\r\n        if (extensionPromise) {\r\n            return extensionPromise;\r\n        }\r\n\r\n        if (!buffer._data) {\r\n            if (buffer.uri) {\r\n                buffer._data = this.loadUriAsync(`${context}/uri`, buffer, buffer.uri);\r\n            } else {\r\n                if (!this._bin) {\r\n                    throw new Error(`${context}: Uri is missing or the binary glTF is missing its binary chunk`);\r\n                }\r\n\r\n                buffer._data = this._bin.readAsync(0, buffer.byteLength);\r\n            }\r\n        }\r\n\r\n        return buffer._data.then((data) => {\r\n            try {\r\n                return new Uint8Array(data.buffer, data.byteOffset + byteOffset, byteLength);\r\n            } catch (e) {\r\n                throw new Error(`${context}: ${e.message}`, { cause: e });\r\n            }\r\n        });\r\n    }\r\n\r\n    /**\r\n     * Loads a glTF buffer view.\r\n     * @param context The context when loading the asset\r","sourceCodeStart":2037,"sourceCodeEnd":2073,"githubUrl":"https://github.com/BabylonJS/Babylon.js/blob/0592b347b8a4ee0236089ea86a749cacfdb266d8/packages/dev/loaders/src/glTF/2.0/glTFLoader.pure.ts#L2037-L2073","documentation":"A glTF buffer must either reference external data via uri, or — for GLB containers — be backed by the binary chunk. This error is thrown when a buffer has no uri AND the loader has no binary chunk (_bin) available, so the buffer data cannot be resolved at all.","triggerScenarios":"Loading a .gltf (JSON) file whose buffer has no uri while expecting GLB-style binary data; loading a GLB whose BIN chunk was stripped; loading only the JSON part of a split .gltf/.bin pair.","commonSituations":"Renaming/moving a .gltf without its .bin sidecar then hand-removing the uri; tools that export JSON-only but omit buffer uris; serving a GLB truncated so the binary chunk is missing.","solutions":["Load the complete GLB including its BIN chunk, not just the JSON.","Add the correct uri to the buffer (e.g. \"data.bin\") and ship the .bin file alongside.","Embed the buffer as a base64 data URI in the JSON if a single file is required.","Re-export the asset ensuring the binary buffer is written."],"exampleFix":"// before\n\"buffers\": [{ \"byteLength\": 1024 }]\n// after\n\"buffers\": [{ \"uri\": \"scene.bin\", \"byteLength\": 1024 }]","handlingStrategy":"validation","validationCode":"for (const buf of gltf.buffers ?? []) {\n  if (!buf.uri && !isGlbWithBinChunk) {\n    throw new Error(`Buffer without uri and no GLB binary chunk available`);\n  }\n}","typeGuard":"function bufferIsResolvable(buf: { uri?: string }, hasBin: boolean): boolean {\n  return typeof buf.uri === \"string\" || hasBin;\n}","tryCatchPattern":"try { await loadAsset(); } catch (e) {\n  if (/Uri is missing or the binary glTF is missing its binary chunk/.test((e as Error).message)) {\n    // locate the .bin sidecar or re-download the full GLB\n  }\n}","preventionTips":["Always move/copy .gltf files together with their .bin sidecars.","Serve complete GLBs (verify the BIN chunk exists and size matches).","Prefer base64-embedded buffers for single-file portability."],"tags":["gltf","buffer","missing-file","asset-loading"],"backgroundTag":"missing-binary-chunk","analyzedSha":"0592b347b8a4ee0236089ea86a749cacfdb266d8","analyzedAt":"2026-08-30T15:11:20.442Z","schemaVersion":2},"datasetVersion":"2026-08-30T18:17:15.746Z"}