title: Need a circle with texture in three.js
body: <p>i'd like to have a circle with a texture on one side in three.js.
  I thought about using THREE.CylinderGeometry, but where do I have to add the "materials" in the new THREE.CylinderGeometry(...)-section?</p>
  
  <p>And I don't want to use sprites.</p>
  
  <p>Thanks! :)</p>