collision.js

App.Draw.findNode = function(e) {
  var mousePos  = new THREE.Vector3(0, 0, 1),
  r,
  matrix;
  mousePos.x = (e.clientX / window.innerWidth) * 2 - 1;
  mousePos.y = (e.clientY / window.innerHeight) * 2 + 1;
  mousePos.z = 1;

  r = new THREE.Ray();
  r.origin = mousePos.clone();
  matrix = this.camera.matrixWorld.clone();
  matrix.multiplySelf(THREE.Matrix4.makeInvert(this.camera.projectionMatrix));
  matrix.multiplyVector3(r.origin);
  r.direction = r.origin.clone().subSelf(this.camera.position);

  var c = THREE.Collisions.rayCastNearest(r);

  return c;
};