These contour lines represent how you should actually be placing your brushstrokes.

这些轮廓线代表您实际应该如何放置笔触。

The best way to practice this is to simply do contour lines on everything.

练习这一点的最佳方法是简单地在所有东西上绘制轮廓线。

And I just apply it under and up with my light contour lines that I did before.

我只是将它应用在我之前做过的浅色轮廓线上下。

So the way we did that was we took the contour lines from the existing mountains, and we took those lines and then translated them into a building.

所以我们这样做的方法是从现有的山脉中提取等高线，然后将这些线转化为建筑物。