/// <summary>
/// 利用笔刷设置贴图
/// </summary>
public static async void SetTextureWithBrush(Vector3 point, int index, float radius, int brushIndex)
{
Vector3 down = new Vector3(point.x - radius, 0, point.z - radius);
Terrain terrain = GetTerrain(point);
if (terrain != null)
{
Vector2Int mapIndex = GetAlphaMapIndex(terrain, down);
int mapRadius = (int)(radius / terrain.terrainData.size.x * terrain.terrainData.alphamapResolution);
float[,,] map = terrain.terrainData.GetAlphamaps(mapIndex.x, mapIndex.y, 2 * mapRadius, 2 * mapRadius);
float[,] brush = await Math2d.ZoomBilinearInterpAsync(brushDic[brushIndex], 2 *mapRadius, 2 *mapRadius);
// 这么计算所附加的贴图实际上是有问题的，但是我懒得继续算了
for (int i = 0; i < map.GetLength(0); i++)
{
for (int j = 0; j < map.GetLength(1); j++)
{
float temp = (1 - brush[i, j]) / (terrain.terrainData.alphamapLayers - 1);
for (int k = 0; k < terrain.terrainData.alphamapLayers; k++)
{
map[i, j, k] = temp;
}
map[i, j, index] = 1 - temp;
}
}
terrain.terrainData.SetAlphamaps(mapIndex.x, mapIndex.y, map);
}
}
/// <summary>
/// 通过自定义笔刷编辑地形
/// </summary>
/// <param name="center">中心点</param>
/// <param name="radius">半径</param>
/// <param name="opacity">力度</param>
/// <param name="brushIndex">笔刷索引</param>
/// <param name="isRise">抬高还是降低</param>
public static async void ChangeHeightWithBrush(Vector3 center, float radius, float opacity, int brushIndex = 0, bool isRise = true)
{
HMArg arg;
Terrain terrain = InitHMArg(center, radius, out arg);
if (terrain == null)
{
return;
}
// 是否反转透明度
if (!isRise)
{
opacity = -opacity;
}
//修改高度图
//float[,] deltaMap = await Utility.BilinearInterp(brushDic[brushIndex], 2 * mapRadius, 2 * mapRadius);
float[,] deltaMap = await Math2d.ZoomBilinearInterpAsync(brushDic[brushIndex], 2 *arg.mapRadiusX, 2 *arg.mapRadiusX);
for (int i = 0; i < 2 * arg.mapRadiusX; i++)
{
for (int j = 0; j < 2 * arg.mapRadiusX; j++)
{
arg.heightMap[i, j] += deltaMap[i, j] * deltaHeight * opacity;
}
}
// 重新设置高度图
SetHeightMap(terrain, arg.heightMap, arg.startMapIndex.x, arg.startMapIndex.y);
}
/// <summary>
/// 通过自定义笔刷编辑地形
/// </summary>
/// <param name="center">中心点</param>
/// <param name="radius">半径</param>
/// <param name="opacity">力度</param>
/// <param name="brushIndex">笔刷索引</param>
/// <param name="isRise">抬高还是降低</param>
private async void InternalChangeHeightWithBrush(Vector3 center, float radius, float opacity, int brushIndex, bool isRise, bool regesterUndo, bool immediate)
{
if (!TryGetHeightMapCmd(center, radius, out HeightCmdData arg))
{
return;
}
if (regesterUndo)
{
RegisterUndo(new HeightCmd(new HeightCmdData(arg)));
}
// 是否反转透明度
if (!isRise)
{
opacity = -opacity;
}
//修改高度图
//float[,] deltaMap = await Utility.BilinearInterp(brushDic[brushIndex], 2 * mapRadius, 2 * mapRadius);
float[,] deltaMap = await Math2d.ZoomBilinearInterpAsync(brushDic[brushIndex], 2 *arg.mapRadiusX, 2 *arg.mapRadiusX);
for (int i = 0; i < 2 * arg.mapRadiusX; i++)
{
for (int j = 0; j < 2 * arg.mapRadiusX; j++)
{
arg.heightMap[i, j] += deltaMap[i, j] * deltaHeight * opacity;
}
}
// 重新设置高度图
SetHeightMap(arg.terrain, arg.heightMap, arg.startMapIndex.x, arg.startMapIndex.y, immediate);
}