how can i export clipped ply pointcloud module?

Description

when i try to export my ThreeJS Scene into plyfile use plyexporter it can not export clipped part of my scene, if i just want to export not clipped part of my scene ,by the way i use clip plane of material to clip my scene

Step

  1. click the export button of html page
  2. save the ply file this program exported
  3. open the ply file in cloudcompare or other software whitch can slove pointcloud material

Example

JSFiddle - Code Playground
i am sorry to say i can not found a way to import plyexporter into this sandbox so i just have an button there

ScreenShot