coalesceRecords(records: WGLDisplayRecord[]): void {
    const nRecords = records.length;

    if (nRecords === 0) {
      return;
    }

    let coalesced = 1;

    for (let i = 1; i < nRecords; ++i) {
      if (
        records[i - coalesced].geometryType === records[i].geometryType &&
        records[i - coalesced]["_materialInfo"] === records[i]["_materialInfo"]
      ) {
        records[i - coalesced].vertexCount += records[i].vertexCount;
        records[i - coalesced].indexCount += records[i].indexCount;
        ++coalesced;
      } else {
        records[i - coalesced + 1] = records[i];
      }
    }

    records.length = records.length - coalesced + 1;
  }