title: ThreeJS: Converting from screen 2D coordinate to world 3D coordinate on the camera near plane? R73
body: <p>I have got a little bit in trouble with coordinate conversion. 
  I have an object on screen with known coordinates (x,y) and I want to convert it to world coordinates (x,y,z) as it would be projected on the camera's near plane. </p>
  
  <p>So far, I can make a projection onto Z plane like this:</p>
  
  <pre><code>var vector = new THREE.Vector3( mouse.x, mouse.y, 1 );
  vector.unproject( camera );
  </code></pre>
  
  <p>But unfortunately I cannot proceed further :(</p>