@loaders.gl/3d-tiles/dist/lib/parsers/helpers/normalize-3d-tile-normals.js

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

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright vis.gl contributors
import { Vector3 } from '@math.gl/core';
import { GL, octDecode } from '@loaders.gl/math';
const scratchNormal = new Vector3();
export function normalize3DTileNormalAttribute(tile, normals) {
    if (!normals) {
        return null;
    }
    if (tile.isOctEncoded16P) {
        const decodedArray = new Float32Array((tile.pointsLength || 0) * 3);
        for (let i = 0; i < (tile.pointsLength || 0); i++) {
            octDecode(normals[i * 2], normals[i * 2 + 1], scratchNormal);
            // @ts-ignore
            scratchNormal.toArray(decodedArray, i * 3);
        }
        return {
            type: GL.FLOAT,
            size: 2,
            value: decodedArray
        };
    }
    return {
        type: GL.FLOAT,
        size: 2,
        value: normals
    };
}
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