Screen to world point

gistfile1.txt

function _onTouchMove(e) {
  _mousePosition
    //マウススクリーン位置
    .set(
      (e.clientX / window.innerWidth) * 2 - 1,
      -(e.clientY / window.innerHeight) * 2 + 1,
      0
    )
    .unproject(camera)
    .sub(camera.position)
    .normalize()
    .multiplyScalar(camera.position.length())
    .add(camera.position);
}