forge-convert-utils/lib/svf/fragments.js

Tools for converting Autodesk Forge file formats.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseFragments = void 0;
const packfile_reader_1 = require("../common/packfile-reader");
/**
 * Parses fragments from a binary buffer, typically stored in a file called 'FragmentList.pack',
 * referenced in the SVF manifest as an asset of type 'Autodesk.CloudPlatform.FragmentList'.
 * @generator
 * @param {Buffer} buffer Binary buffer to parse.
 * @returns {Iterable<IFragment>} Instances of parsed fragments.
 */
function* parseFragments(buffer) {
    const pfr = new packfile_reader_1.PackFileReader(buffer);
    for (let i = 0, len = pfr.numEntries(); i < len; i++) {
        const entryType = pfr.seekEntry(i);
        console.assert(entryType);
        console.assert(entryType.version > 4);
        const flags = pfr.getUint8();
        const visible = (flags & 0x01) !== 0;
        const materialID = pfr.getVarint();
        const geometryID = pfr.getVarint();
        const transform = pfr.getTransform();
        let bbox = [0, 0, 0, 0, 0, 0];
        let bboxOffset = [0, 0, 0];
        if (entryType.version > 3) {
            if (transform && 't' in transform) {
                bboxOffset[0] = transform.t.x;
                bboxOffset[1] = transform.t.y;
                bboxOffset[2] = transform.t.z;
            }
        }
        for (let j = 0; j < 6; j++) {
            bbox[j] = pfr.getFloat32() + bboxOffset[j % 3];
        }
        const dbID = pfr.getVarint();
        yield { visible, materialID, geometryID, dbID, transform, bbox };
    }
}
exports.parseFragments = parseFragments;