C# 统一-给出相同数字的PerlinNoise

我正在构建一个基于瓷砖的游戏，我想在其中生成一个供玩家探索的世界。出于某种原因，Mathf.PerlinNoise（）有时会反复给出相同的数字，即使每次给出的XY都不同

void Start () {
    treeOffsetX = Mathf.Round(Random.Range (10f,300000f));
    treeOffsetY = Mathf.Round(Random.Range (10f,300000f));
    waterOffsetX = Mathf.Round(Random.Range (10f,300000f));
    waterOffsetY = Mathf.Round(Random.Range (10f,300000f));
    boulderOffsetX = Mathf.Round(Random.Range (10f,300000f));
    boulderOffsetY = Mathf.Round(Random.Range (10f,300000f));

    for (float x = -gridX; x < gridX; x += 0.1f) 
    {
        for (float y = -gridY; y < gridY; y += 0.1f) {
            Vector3 spawnPos = new Vector3 (x * 10, y * 10, 0);
            float perlinTree = Mathf.PerlinNoise ((x + treeOffsetX) / seedTreeX, (y + treeOffsetY) / seedTreeY);
            float perlinWater = Mathf.PerlinNoise ((x + waterOffsetX) / seedWaterX, (y + waterOffsetY) / seedWaterY);
            float perlinBoulder = Mathf.PerlinNoise ((x + boulderOffsetX) / seedBoulderX, (y + boulderOffsetY) / seedBoulderY);


            if (perlinWater > perlinThresholdWater) {
                GameObject waterTile = Instantiate (water, spawnPos, Quaternion.identity) as GameObject;
            } else if (perlinBoulder > perlinThresholdBoulder) {
                GameObject grassTile = Instantiate (grass, spawnPos, Quaternion.identity) as GameObject;
                GameObject boulderTile = Instantiate (boulder, spawnPos, Quaternion.identity) as GameObject;
            } else if (perlinTree > perlinThresholdTree) {
                GameObject grassTile = Instantiate (grass, spawnPos, Quaternion.identity) as GameObject;
                GameObject treeTile = Instantiate (tree, spawnPos, Quaternion.identity) as GameObject;
            } else {
                GameObject grassTile = Instantiate (grass, spawnPos, Quaternion.identity) as GameObject;
            }
        }
    }
}

void Start（）{
treeOffsetX=数学圆整（随机范围（10f，300000f））；
treeOffsetY=数学圆整（随机范围（10f，300000f））；
waterOffsetX=数学圆（随机范围（10f，300000f））；
waterOffsetY=Mathf.Round（Random.Range（10f，300000f））；
boulderOffsetX=数学圆整（随机范围（10f，300000f））；
boulderOffsetY=Mathf.Round（随机范围（10f，300000f））；
对于（浮点x=-gridX；xperlinThresholdWater）{
GameObject waterTile=实例化（water、spawnPos、Quaternion.identity）为GameObject；
}否则如果（perlinBoulder>Perlinthresholdbulder）{
GameObject grassTile=实例化（grass、spawnPos、Quaternion.identity）为GameObject；
GameObject boulderTile=实例化（boulder、spawpos、Quaternion.identity）为GameObject；
}else if（perlinTree>perlinThresholdTree）{
GameObject grassTile=实例化（grass、spawnPos、Quaternion.identity）为GameObject；
GameObject treeTile=实例化（树、spawnPos、Quaternion.identity）为GameObject；
}否则{
GameObject grassTile=实例化（grass、spawnPos、Quaternion.identity）为GameObject；
}
}
}
}

因此，有时，每当穿过环路时，悬钩树或悬钩石都会给出相同的数字。这样就不会产出树木或巨石。我对水没有问题

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它怎么可能有时起作用，有时不起作用？

你的阈值是多少？树：0.775，巨石：0.9，水：0.7你的阈值是多少？树：0.775，巨石：0.9，水：0.7