speed up for reading and writing ply files

wu_xinjun

2022-04-02 b7a9cf522716f3236d4077c75d7ed147a67200b4

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{
  "runtimeOptions": {
    "tfm": "netcoreapp3.0",
    "framework": {
      "name": "Microsoft.NETCore.App",
      "version": "3.0.0"
    }
  }
}