Class DracoCompression
Hierarchy
- DracoCompression
Implements
Index
Constructors
Properties
Accessors
Methods
Constructors
constructor
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Constructor
Parameters
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Optional numWorkers: number
The number of workers for async operations. Specify
0to disable web workers and run synchronously in the current context.
Returns DracoCompression
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Properties
Static ConfigurationSearch playground for Configuration
The configuration. Defaults to the following urls:
- wasmUrl: "https://preview.babylonjs.com/draco_wasm_wrapper_gltf.js"
- wasmBinaryUrl: "https://preview.babylonjs.com/draco_decoder_gltf.wasm"
- fallbackUrl: "https://preview.babylonjs.com/draco_decoder_gltf.js"
Static Default
Default number of workers to create when creating the draco compression object.
Accessors
Static Decoder
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Returns true if the decoder configuration is available.
Returns boolean
Static Default
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Default instance for the draco compression object.
Returns DracoCompression
Methods
decode
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Decode Draco compressed mesh data to vertex data.
Parameters
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data: ArrayBuffer | ArrayBufferView
The ArrayBuffer or ArrayBufferView for the Draco compression data
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Optional attributes: {}
A map of attributes from vertex buffer kinds to Draco unique ids
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[kind: string]: number
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Optional dividers: {}
a list of optional dividers for normalization
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[kind: string]: number
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Returns Promise<VertexData>
A promise that resolves with the decoded vertex data
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disposeSearch playground for dispose
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Stop all async operations and release resources.
Returns void
when
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Returns a promise that resolves when ready. Call this manually to ensure draco compression is ready before use.
Returns Promise<void>
a promise that resolves when ready
Draco compression (https://google.github.io/draco/)
This class wraps the Draco module.
Encoder
The encoder is not currently implemented.
Decoder
By default, the configuration points to a copy of the Draco decoder files for glTF from the babylon.js preview cdn https://preview.babylonjs.com/draco_wasm_wrapper_gltf.js.
To update the configuration, use the following code:
DracoCompression.Configuration = { decoder: { wasmUrl: "<url to the WebAssembly library>", wasmBinaryUrl: "<url to the WebAssembly binary>", fallbackUrl: "<url to the fallback JavaScript library>", } };Draco has two versions, one for WebAssembly and one for JavaScript. The decoder configuration can be set to only support WebAssembly or only support the JavaScript version. Decoding will automatically fallback to the JavaScript version if WebAssembly version is not configured or if WebAssembly is not supported by the browser. Use
DracoCompression.DecoderAvailableto determine if the decoder configuration is available for the current context.To decode Draco compressed data, get the default DracoCompression object and call decodeMeshAsync:
var vertexData = await DracoCompression.Default.decodeMeshAsync(data);https://playground.babylonjs.com/#DMZIBD#0