Class DracoCompression

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.DecoderAvailable to 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);