Unity3d程序化地形生成平面和高度区域之间的平滑交叉

Question

我想生成一个代码，该代码生成一个地形，该地形的中间是平坦区域，周围是丘陵。问题是我找不到平滑解决这两个区域的解决方案。我可以在这里进行平滑穿越的区域，但是我不知道如何进行。实际上看起来像这样：Terrain中间区域和周围区域之间的间隙应该是平滑的交叉点。

public class TerrainGenerator : MonoBehaviour
{
    public InputField platformWidthInput, platformLengthInput, terrainWidthInput, terrainLengthInput;
    public Terrain terrain;
    public float scale, height;

    private int platformWidth, platformWidthHalf, platformLength, platformLengthHalf;
    private int terrainWidth, terrainWidthHalf, terrainLength, terrainLengthHalf;

    public void Generate()
    {
        platformWidth = int.Parse(platformWidthInput.text);
        platformWidthHalf = platformWidth / 2;
        platformLength = int.Parse(platformLengthInput.text);
        platformLengthHalf = platformLength / 2;

        terrainWidth = int.Parse(terrainWidthInput.text);
        terrainWidthHalf = terrainWidth / 2;
        terrainLength = int.Parse(terrainLengthInput.text);
        terrainLengthHalf = terrainLength / 2;

        var terrainInstance = InstantiateTerrain(terrain, new Vector3(-terrainWidthHalf, 0, -terrainLengthHalf), "Terrain");
        TerrainData(terrainInstance.terrainData);
    }

    private static Terrain InstantiateTerrain(Terrain terrain, Vector3 position, string name)
    {
        var instance = Instantiate(terrain, position, Quaternion.identity);
        instance.name = name;

        return instance;
    }

    private void TerrainData(TerrainData terrainData)
    {
        var platformPercentWidth = (platformWidth / 100) * 10;
        var platformPercentLength = (platformLength / 100) * 10;

        terrainData.size = new Vector3(terrainWidth, height, terrainLength);
        terrainData.heightmapResolution = terrainWidth + terrainLength + 1;

        var resScaleX = (float) terrainWidth / terrainData.heightmapResolution;
        var resScaleY = (float) terrainLength / terrainData.heightmapResolution;

        var xRes = terrainData.heightmapWidth;
        var yRes = terrainData.heightmapHeight;

        var heights = terrainData.GetHeights(0, 0, xRes, yRes);

        for (var x = 0; x < xRes; x++)
        {
            for (var y = 0; y < yRes; y++)
            {
                if (x >= (terrainWidthHalf - platformWidthHalf) / resScaleX && x <= (terrainWidthHalf + platformWidthHalf) / resScaleX && y >= (terrainLengthHalf - platformLengthHalf) / resScaleY && y <= (terrainLengthHalf + platformLengthHalf) / resScaleY)
                {
                    heights[x, y] = 1;
                }
                else if (x >= (terrainWidthHalf - platformWidthHalf - platformPercentWidth) / resScaleX && x <= (terrainWidthHalf + platformWidthHalf + platformPercentWidth) / resScaleX && y >= (terrainLengthHalf - platformLengthHalf - platformPercentLength) / resScaleY && y <= (terrainLengthHalf + platformLengthHalf + platformPercentLength) / resScaleY)
                {
                    heights[x, y] = 0.5f;
                    //Smooth Area
                }
                else
                {
                    heights[x, y] = Mathf.PerlinNoise((float) x / xRes * scale, (float) y / yRes * scale);
                }
            }
        }

        terrainData.SetHeights(0, 0, heights);
    }
}