@loaders.gl/3d-tiles/dist/lib/parsers/parse-3d-tile-gltf.js

3D Tiles, an open standard for streaming massive heterogeneous 3D geospatial datasets.

// loaders.gl
// SPDX-License-Identifier: MIT license
// Copyright (c) vis.gl contributors
import { parseFromContext } from '@loaders.gl/loader-utils';
import { _getMemoryUsageGLTF, GLTFLoader, postProcessGLTF } from '@loaders.gl/gltf';
export async function parseGltf3DTile(tile, arrayBuffer, options, context) {
    // Set flags
    // glTF models need to be rotated from Y to Z up
    // https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/specification#y-up-to-z-up
    tile.rotateYtoZ = true;
    // Save gltf up axis
    tile.gltfUpAxis = options?.['3d-tiles']?.assetGltfUpAxis
        ? options['3d-tiles'].assetGltfUpAxis
        : 'Y';
    if (options?.['3d-tiles']?.loadGLTF) {
        if (!context) {
            return arrayBuffer.byteLength;
        }
        const gltfWithBuffers = await parseFromContext(arrayBuffer, GLTFLoader, options, context);
        tile.gltf = postProcessGLTF(gltfWithBuffers);
        tile.gpuMemoryUsageInBytes = _getMemoryUsageGLTF(tile.gltf);
    }
    else {
        tile.gltfArrayBuffer = arrayBuffer;
    }
    return arrayBuffer.byteLength;
}