function addNode(node, parent_geomentry) {
    var tmp_geometry = new THREE.BoxGeometry( 20, 20, 20);
    var mesh = new THREE.Mesh(tmp_geometry);
    mesh.position.x = node.coords.x;
    mesh.position.y = node.coords.y;
    mesh.position.z = node.coords.z;

    mesh.updateMatrix();
    parent_geomentry.merge(mesh.geometry, mesh.matrix);
    node_meshes.push(mesh);
}


function onMouseDown( event ) {
    var mouse = new THREE.Vector2();
    mouse.x = ( event.clientX / renderer.domElement.width ) * 2 - 1;
    mouse.y = - ( event.clientY / renderer.domElement.height ) * 2 + 1;

    console.log(mouse, camera);
    raycaster.setFromCamera( mouse, camera );

    var intersects = raycaster.intersectObjects(node_meshes);

    console.log(node_meshes);
    console.log(intersects);
}

window.addEventListener( 'mousedown', onMouseDown, false );