title: create 3d perpendicular walls using Three.js
body: <p>i am wondering if it's possible to create 3d perpendicular walls using Three.js as on this image <img src="https://i.stack.imgur.com/CURvc.jpg" alt="enter image description here"></p>
  
  <p>i tried to use THREE.Shape to draw a rectangle but i don't know how to add more perpendicular or parallel rectangles.</p>