title: Three.JS Object Clipping?
body: <p>I am trying to section my 3D models using three.js in a way similar to how Unity can:
  <a href="https://i.stack.imgur.com/E30Is.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/E30Is.jpg" alt="enter image description here"></a></p>
  
  <p>I have been playing around with the camera controls and of course I can adjust the near / far fields to clip in the direction of the camera, but what if I wanted to just clip in the X or Y plane? I looked at potentially adding a large transparent block that could slide on that axis and then use binary operations to merge / subtract where it intersects the object, but the tools end up creating a new mesh along the new plane rather than actually removing everything along that axis.</p>
  
  <p>Do I need to be working with multiple viewports, or is there a simpler way?</p>