生成地形贴图

private Texture2D GenerateMapTexture(int[,] cellTextureIndexMap,Texture2D groundTexture, Texture2D[] marshTextures)
{
     int mapWidth = cellTextureIndexMap.GetLength(0);
     int mapHeight = cellTextureIndexMap.GetLength(1);
     int textureCellSize = groundTexture.width;//假设地面贴图是正方形的
     Texture2D mapTexture = new Texture2D(mapWidth*textureCellSize, mapHeight*textureCellSize);
     //遍历每个格子，给每个格子赋予对应的贴图
     for (int y = 0; y < mapHeight; y++)
     {
         int offsetY = y * textureCellSize;
         for (int x = 0; x < mapWidth; x++)
         {
             int offsetX = x * textureCellSize;
             int textureIndex = cellTextureIndexMap[x, y]-1;
             // 绘制每一个格子内的像素
             for (int y1=0;y1<textureCellSize;y1++)
             {
                 for(int x1=0; x1 < textureCellSize; x1++)
                 {
                     //设置某个像素点的颜色
                     //确定是森林贴图还是沼泽贴图
                     //这个地方是森林||沼泽但是透明，需要绘制底面贴图
                     if (textureIndex <= 0)
                     {
                         Color color = groundTexture.GetPixel(x1, y1);
                         mapTexture.SetPixel(x1 + offsetX, y1 + offsetY, color);
                     }
                     else
                     {
                         Color color = marshTextures[textureIndex].GetPixel(x1, y1);
                         if (color.a==0)
                         {
                             mapTexture.SetPixel(x1 + offsetX, y1 + offsetY, groundTexture.GetPixel(x1,y1));
                         }
                         else
                         {
                             mapTexture.SetPixel(x1 + offsetX, y1 + offsetY, color);
                         }
                     }
                 }
             }
         }
     }
     mapTexture.filterMode = FilterMode.Point;
     mapTexture.wrapMode = TextureWrapMode.Clamp;
     mapTexture.Apply();
     return mapTexture;
}