计算贴图索引数字

在生成网格获取噪声图之后，就需要在网格之中计算每一个格子对应的贴图索引数字

private void SetVertexType(Vector2Int vertexIndex,MapVertexType mapVertexType)
{
	MapVertex vertex = GetVertex(vertexIndex);
	if ((vertex.VertexType!=mapVertexType))
	{
		vertex.VertexType = mapVertexType;
		//计算附近的贴图权重
		if(vertex.VertexType == MapVertexType.Swamp)
		{
			MapCell tempCell = GetLeftBottomMapCell(vertexIndex);
			if (tempCell != null)
			{
				tempCell.TextureIndex += 1;
			}
			tempCell = GetRightBottomMapCell(vertexIndex);
			if (tempCell != null)
			{
				tempCell.TextureIndex += 2;
			}
			tempCell = GetLeftTopMapCell(vertexIndex);
			if (tempCell != null)
			{
				tempCell.TextureIndex += 4;
			}
			tempCell = GetRightTopMapCell(vertexIndex);
			if (tempCell != null)
			{
				tempCell.TextureIndex += 8;
			}
		}
	}
}

1. 根据噪声图获取并设置到对应顶点的贴图类型 2. 给每个顶点周围贴图赋值增加1，2，4，8

public int[,] CalculateCellTextureIndex(float[,] noiseMap,float limit)
{
	int width = noiseMap.GetLength(0);
	int height = noiseMap.GetLength(1);
	for(int x=1; x<=width;x++)
	{
		for (int z = 1; z <= height; z++)
		{
			if (noiseMap[x-1,z-1] >= limit)//大于边界设置为沼泽
			{
				SetVertexType(x, z, MapVertexType.Swamp);
			}
			else
			{
				SetVertexType(x, z, MapVertexType.Forest);
			}
		}
	}
	//到这里可以确定所有格子的贴图索引了
	int[,] textureIndexMap = new int[width, height];
	for(int x=0; x<width; x++)
	{
		for (int z = 0; z < height; z++)
		{
			MapCell cell = GetCell(x + 1, z + 1);
			if (cell != null)
			{
				textureIndexMap[x, z] = cell.TextureIndex;
			}
		}
	}
	return textureIndexMap;
}