gistfile1.js

  var size = 100,
      uvMat = mesh.geometry.faceVertexUvs[0],
      faceVerts, fi, vi;

  for( fi = 0; faceVerts = uvMat[fi++]; ) {
      for( vi = 0; vi < faceVerts.length; vi++ ) {

          var pos = mesh.localToWorld( mesh.geometry.vertices[ vi ].clone() );

          faceVerts[ vi ] = new THREE.Vector2(
              ((100000 + pos.x) % size) / size,
              ((100000 + pos.y) % size) / size
          );

      }

  }
  mesh.geometry.uvsNeedUpate = true;