为什么分配高度贴图分辨率会增加我的地形大小

Question

所以我一直在尝试使用代码生成地形，但我遇到了一个问题。当我分配高度贴图分辨率时，我的地形大小会增加 2 的幂。

例如，如果我的高度图分辨率为 513，则我的地形大小将增加 16 倍。如果我的高度贴图分辨率为 257，则我的地形大小会增加 8 倍。

据我了解（我也读过这篇文章），高度图分辨率不应该影响地形的大小。

我必须强调，尺寸增加只发生在 X 轴和 Z 轴上。高度保持不变。

        /// <summary>
        /// Gets the terrain data either from memory if its loaded, from disk if it isnt, or generates a new one of neither of those are available.
        /// </summary>
        /// <value>The terrain data.</value>
        public static TerrainData terrainData {
            get {
                TerrainData terrainData = new TerrainData();
                if(isTerrainLoaded){
                    //Debug.Log("terrainData is already loaded, returning it!");
                    return(loadedTerrainData);
                }
                else if(Resources.Load("terrainData") != null && !generateNewTerrain){
                    terrainData = Resources.Load("terrainData") as TerrainData;
                    Debug.Log("Read terrainData from disk!");
                }
                else{
                    Debug.Log("No terrainData found on disk, generating a new random one...");
                    terrainData.size = new Vector3(width, height - sandBaseHeight, length);
                    Debug.Log ("Original terrain size: " + terrainData.size);
                    terrainData.heightmapResolution = heightmapResolution;
                    Debug.Log ("Bigger terrain size: " + terrainData.size);
                    terrainData.baseMapResolution = baseMapResolution;
                    terrainData.SetDetailResolution((int)detailResolution.x, (int)detailResolution.y); //(int) because data is stored in a Vector2 which is float
                    terrainData.alphamapResolution = aplhaMapResolution;
                    float[,] heights = new float[terrainData.heightmapWidth,terrainData.heightmapHeight];
                    Vector2 randomLocation; //for perlin noise
                    randomLocation.x = Random.Range(-10000,10000);  //that is hopefully enough
                    randomLocation.y = Random.Range(-10000,10000);
                    for (int x = 0; x < terrainData.heightmapWidth; x++) {
                        for (int z = 0; z < terrainData.heightmapWidth; z++) {
                            heights[x,z] = Mathf.PerlinNoise(randomLocation.x + (float)x/scale, randomLocation.y + (float)z/scale);
                        }
                    }
                    terrainData.SetHeights (0, 0, heights);
                    terrainData.splatPrototypes = splatTextures;
                    AssetDatabase.CreateAsset(terrainData,"Assets/Resources/terrainData.asset");
                }
                loadedTerrainData = terrainData;
                return(terrainData);
            }
        }

这就是生成我的地形数据的集团。地形大小的变化已经在 Debug.Log 中可见（"更大的地形大小："+ terrainData.size）;在我分配高度图分辨率后立即。

关于为什么会发生这种情况的任何想法？

Answer 1

我想通了。

在设置地形大小之前，我必须设置高度图分辨率。这是按预期工作的最终代码。

terrainData.heightmapResolution = heightmapResolution;
terrainData.size = new Vector3(width, height - sandBaseHeight, length);
terrainData.baseMapResolution = baseMapResolution;
terrainData.SetDetailResolution((int)detailResolution.x, (int)detailResolution.y);
terrainData.alphamapResolution = aplhaMapResolution;
Debug.Log ("Terrain size: " + terrainData.size); //Correct terrain size

希望这也对其他人有所帮助！