This completed Z-buffer is used in conjunction with a fancier version of scanline rendering that not only tests for line intersection, but also does a lookup to see if that pixel will even be visible in the final scene.

这个完整的 Z 缓冲区与更高级版本的扫描线渲染结合使用，它不仅测试线相交，而且还进行查找以查看该像素在最终场景中是否可见。