/// <summary>
/// 利用笔刷设置贴图
/// </summary>
public async void SetTextureWithBrush(Terrain terrain, Vector3 point, int index, float radius, float[,] brush)
{
Vector3 down = new Vector3(point.x - radius, 0, point.z - radius);
if (terrain != null)
{
Vector2Int mapIndex = TerrainUtility.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[,] realBrush = await Math2d.ZoomBilinearInterpAsync(brush, 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 - realBrush[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>
/// 设置贴图
/// </summary>
/// <param name="center">中心点</param>
/// <param name="radius">半径</param>
/// <param name="index">layer索引</param>
/// <param name="strength">力度</param>
/// <param name="isMix">是否混合， 如果为false 则strength无效</param>
private void InternalSetTexture(Vector3 center, float radius, int index, float strength, bool isMix, bool regesterUndo)
{
Vector3 leftDown = new Vector3(center.x - radius, 0, center.z - radius);
Terrain terrain = Utility.SendRayDown(leftDown, LayerMask.GetMask("Terrain")).collider?.GetComponent <Terrain>();
if (terrain != null)
{
// 获取数据
TerrainData terrainData = terrain.terrainData;
int mapRadius = (int)(radius / terrainData.size.x * terrainData.alphamapResolution);
Vector2Int mapIndex = TerrainUtility.GetAlphaMapIndex(terrain, leftDown);
float[,,] alphaMap = TerrainUtility.GetAlphaMap(terrain, mapIndex.x, mapIndex.y, 2 * mapRadius, 2 * mapRadius);
if (regesterUndo)
{
TextureCmdData textureCmdData = new TextureCmdData(terrain, mapIndex, alphaMap);
RegisterUndo(new TextureCmd(textureCmdData));
}
// 修改数据
if (isMix)
{
ChangeAlphaMap(alphaMap, index, strength);
}
else
{
ChangeAlphaMapNoMix(alphaMap, index);
}
// 设置数据
TerrainUtility.SetAlphaMap(terrain, alphaMap, mapIndex.x, mapIndex.y);
}
}
/// <summary>
/// 设置贴图
/// </summary>
/// <param name="point"></param>
/// <param name="index"></param>
public void InternalSetTexture(Vector3 center, float radius, int index, float strength)
{
Vector3 leftDown = new Vector3(center.x - radius, 0, center.z - radius);
Terrain terrain = Utility.SendRayDown(leftDown, LayerMask.GetMask("Terrain")).collider?.GetComponent <Terrain>();
if (terrain != null)
{
// 获取数据
TerrainData terrainData = terrain.terrainData;
int mapRadius = (int)(radius / terrainData.size.x * terrainData.alphamapResolution);
Vector2Int mapIndex = TerrainUtility.GetAlphaMapIndex(terrain, leftDown);
float[,,] alphaMap = TerrainUtility.GetAlphaMap(terrain, mapIndex.x, mapIndex.y, 2 * mapRadius, 2 * mapRadius);
// 修改数据
ChangeAlphaMap(alphaMap, index, strength);
// 设置数据
TerrainUtility.SetAlphaMap(terrain, alphaMap, mapIndex.x, mapIndex.y);
}
}