Get XYZ using 3D, WebGL, Threejs

This is the 2 phase of my task where I have a mesh and I need to get the Vertex location of XYZ coordinates of the a 3D mesh. See image Screen-2 for the example of what I need. The mesh in 3D is built with a 10X10 matrix as the one in the attached image. You will need to know WebGL or Threejs and principles of 3D.