title: Is it possible to cut parts of the shape 'Geometry' away in Three.js?
body: <p>Is it possible to remove or cut away sections of shapes in Three.js?</p>
  <p>For example, if I made a CylinderGeometry and wanted to &quot;shave&quot; the front of it away, so that the front was flat and the back was curved, like a half cylinder. Is this possible?</p>
  <p>I need to be able to do it to the front and back of a cylinder, so just the sides are curved.</p>