placePoint: function(event, rect, positions, count, scene) {
      if (input["LMB"] && input["KeyV"]) {
        var plane = new THREE.Plane(new THREE.Vector3(0, 1, 0), 0);
        var mouse = new THREE.Vector2();
        var raycaster = new THREE.Raycaster();
        mouse.x = ((event.clientX - rect.left) / rect.width ) * 2 - 1;
        mouse.y = -((event.clientY - rect.top) / rect.height) * 2 + 1;
        raycaster.setFromCamera(mouse, camera);
        var intersection = raycaster.ray.intersectPlane(plane);
        var dotGeometry = new THREE.Geometry();
        dotGeometry.vertices.push(new THREE.Vector3(intersection.x, 0, intersection.z));
        var dotMaterial = new THREE.PointsMaterial({size: 3, sizeAttenuation: false});
        var dot = new THREE.Points(dotGeometry, dotMaterial);
        scene.add(dot);
        positions[count.c * 3 + 0] = intersection.x;
        positions[count.c * 3 + 1] = intersection.y;
        positions[count.c * 3 + 2] = intersection.z;
        count.c++;
      }