Check for a tic-tac-toe winner with rays. This is referenced on my blog, blog.tempt3d.com

checkTTTwinner.js

// loop through all the rays and look to see if all of their collisions objects show the same values.
//
//    essentially, a ray will intersect all faces in one particular direction.  3 cubes = 6 faces = 6 intersections
//    if all of the intersections show a 'selection' has take place, it'll check the selection types (ttt property)
function checkForTTT(){

  var i,j,
      collisions,
      ticUser1,
      ticUser2;

  for(i = 0; i < rays.length; i++){
    collisions = rays[i].intersectObjects(_demo.collisions);
    ticUser1 = 0;
    ticUser2 = 0;

    for(j = 0; j < collisions.length; j++){
      if(collisions[j].object.ttt === 'user1'){
        ticUser1++;
      } else if (collisions[j].object.ttt === 'user2'){
        ticUser2++;
      }
    }

    if(ticUser1 === collisions.length){
      console.log("Tic Tac Toe - User 1");
      $('#winner').append("User 1 (black) - Winner");
      gameOver = true;
    }

    if (ticUser2 === collisions.length){
      console.log("Tic Tac Toe - User 2");
      $('#winner').append("User 2 (red) - Winner");
      gameOver = true;
    }
  }
}