Minicraft中使用的这种采样算法有名称吗？

Question

对于Ludum Dare 22,Notch在48小时内制作了一款名为Minicraft的游戏.这就像是一个2D的世界.

无论如何,源代码可用(这里:http://www.ludumdare.com/compo/ludum-dare-22/？action = preview&uid = 398),我正在看一看,因为我对随机生成的地形和水平.在代码中是运行核心代的代码块,对我来说算法似乎很熟悉,但我不能给它起个名字.我想确切地知道它是什么,所以我可以阅读更多关于它并了解它是如何工作的.

具体来说,代码来自levelGen.java:

    do {
        int halfStep = stepSize / 2;
        for (int y = 0; y < w; y += stepSize) {
            for (int x = 0; x < w; x += stepSize) {
                double a = sample(x, y);
                double b = sample(x + stepSize, y);
                double c = sample(x, y + stepSize);
                double d = sample(x + stepSize, y + stepSize);

                double e = (a + b + c + d) / 4.0 + (random.nextFloat() * 2 - 1) * stepSize * scale;
                setSample(x + halfStep, y + halfStep, e);
            }
        }
        for (int y = 0; y < w; y += stepSize) {
            for (int x = 0; x < w; x += stepSize) {
                double a = sample(x, y);
                double b = sample(x + stepSize, y);
                double c = sample(x, y + stepSize);
                double d = sample(x + halfStep, y + halfStep);
                double e = sample(x + halfStep, y - halfStep);
                double f = sample(x - halfStep, y + halfStep);

                double H = (a + b + d + e) / 4.0 + (random.nextFloat() * 2 - 1) * stepSize * scale * 0.5;
                double g = (a + c + d + f) / 4.0 + (random.nextFloat() * 2 - 1) * stepSize * scale * 0.5;
                setSample(x + halfStep, y, H);
                setSample(x, y + halfStep, g);
            }
        }
        stepSize /= 2;
        scale *= (scaleMod + 0.8);
        scaleMod *= 0.3;
    } while (stepSize > 1);

那两个for循环正在运行某种采样算法,我只想知道这是否是已知的命名算法,或者槽是否只是自己的.

Answer 1

这看起来像菱形算法.