title: Coordinates of intersection between Ray and Plane
body: <p>I have got a ray and a plane. The ray is intersecting the plane and I would like to know where. How do I get the world-coordinates of this intersetion?</p>
  
  <p>(My particular case I unproject screen-coordinates to the camera and create the ray. The plane is the ground of the scene)</p>
  
  <pre><code>var vector = new THREE.Vector3( mousePosition.x, mousePosition.y, 1 );
  projector.unprojectVector( vector, camera );
  var ray = new THREE.Ray(
      camera.position,
      vector.subSelf( camera.position ).normalize()
  );
  </code></pre>