尝试通过代码根据图像纹理颜色设置高度图

Question

好吧，我正在尝试从图像/纹理颜色（从像素）设置地形的高度图，我做了这个简单的例子：

using UnityEngine;

public class TerrainExample : MonoBehaviour
{
    public Texture2D map, grassTexture;
    public float amp = 8;
    public Color waterColor = new Color(0.427f, 0.588f, 0.737f); //new Color32(127, 168, 200, 255); //0.427, 0.588, 0.737

    private Vector3 mapPlane = new Vector3(4200, 0, 3000);

    public void Start()
    {
        GameObject TerrainObj = new GameObject("TerrainObj");
        TerrainData _TerrainData = new TerrainData();
        Debug.Log(new Vector3(mapPlane.x, 600, mapPlane.z));
        _TerrainData.size = new Vector3(mapPlane.x / (1.6f * amp), 600, mapPlane.z / (1.6f * amp));
        _TerrainData.heightmapResolution = 4096;
        _TerrainData.baseMapResolution = 1024;
        _TerrainData.SetDetailResolution(1024, 16);

        //Set terrain data
        int _heightmapWidth = _TerrainData.heightmapWidth,
            _heightmapHeight = _TerrainData.heightmapHeight;
        float[,] heights = new float[_heightmapWidth, _heightmapHeight];
        float stepX = (float)map.width / _heightmapWidth, stepY = (float)map.height / _heightmapHeight;
        int w = 0;
        for (float i = 0; i < map.width; i += stepX)
            for (float k = 0; k < map.height; k += stepY)
            {
                int ii = (int)i, kk = (int)k, i2 = (int)(i / stepX), k2 = (int)(k / stepY);
                heights[i2, k2] = map.GetPixel(ii, kk) == waterColor ? .25f : .5f;
            }
        _TerrainData.SetHeights(0, 0, heights);

        //Set terrain grass texture
        SplatPrototype terrainTexture = new SplatPrototype();
        terrainTexture.texture = grassTexture;
        SplatPrototype[] splatPrototype = new SplatPrototype[1] { terrainTexture };
        _TerrainData.splatPrototypes = splatPrototype;
        TerrainCollider _TerrainCollider = TerrainObj.AddComponent<TerrainCollider>();
        Terrain _Terrain2 = TerrainObj.AddComponent<Terrain>();
        _TerrainCollider.terrainData = _TerrainData;
        _Terrain2.terrainData = _TerrainData;
        TerrainObj.transform.position = -mapPlane * 10 / 2 + Vector3.up * 100;
    }
}

我的地图纹理如下：

原图有7000x5000像素，我的高度图有4096个单位。因此，我必须通过计算每次迭代的步长来做一点翻译（如您在 第 25 行 中所见）

我做的很简单，我只在有水的时候放了0.25f的高度(600/4 = 150)，在有水的时候放了0.5f的高度(600 / 2 = 300)水。 （第 31 行）

但出于某种原因，我只在地形上看到了这条奇怪的线：

我错过了什么？？？

这里是Unitypackage.

Answer 1

我真的懒得分配纹理，我会让你这样做。

创建新场景
添加地形
添加以下组件

代码：

using UnityEngine;

namespace Assets
{
    public class Test : MonoBehaviour
    {
        public Texture2D Texture2D;

        private void OnEnable()
        {
            var terrain = GetComponent<Terrain>();
            var data = terrain.terrainData;
            var hw = data.heightmapWidth;
            var hh = data.heightmapHeight;
            var heights = data.GetHeights(0, 0, hw, hh);

            for (var y = 0; y < hh; y++)
            {
                for (var x = 0; x < hw; x++)
                {
                    // normalize coordinates
                    var x1 = 1.0f / hw * x * Texture2D.width;
                    var y1 = 1.0f / hh * y * Texture2D.height;

                    // get color height
                    var pixel = Texture2D.GetPixel((int) x1, (int) y1);
                    var f = pixel.grayscale; // defines height
                    var g = f * f * f; // some smoothing
                    var s = 0.025f; // some scaling

                    heights[x, y] = g * s;
                }
            }

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

其中最有趣的是平滑，它显着改善了输出。

此外，您可以从 pre-defined 列表（例如水、草）和 interpolate/smooth.

中找到 which color the pixel is close to

此外，您可能需要调整代码，因为我对 TerrainData 不是很熟悉。

尝试通过代码根据图像纹理颜色设置高度图

Trying to set heightmaps depending on image texture colors through code

c#

terrain

texture2d

unity3d

heightmap