threejs 空间位置转为屏幕像素xy位置

function createVector(x, y, z, camera, width, height) {
var p = new THREE.Vector3(x, y, z);
var vector = p.project(camera);
vector.x = (vector.x + 1) / 2 * width;
vector.y = -(vector.y - 1) / 2 * height;
return vector;
}