UnityEngine.Terrain.Flush C# (CSharp) Method

        public extern void Flush();
        public void GetClosestReflectionProbes(List<ReflectionProbeBlendInfo> result)

    protected void paintTerrain(MapCell[,] map, Door d)
    {
        terrain = this.gameObject.GetComponent<Terrain>();
        float[,,] splatmapData = new float[terrain.terrainData.alphamapWidth, terrain.terrainData.alphamapHeight, terrain.terrainData.alphamapLayers];

        float[] splatWallWeights = new float[terrain.terrainData.alphamapLayers];
        splatWallWeights[0] = 0f;
        splatWallWeights[1] = 1f;

        float[] splatFloorWeights = new float[terrain.terrainData.alphamapLayers];
        splatFloorWeights[0] = 1f;
        splatFloorWeights[1] = 0f;

        int indexXmap, indexYmap;
        for (int i = 0; i < splatmapData.GetLength(0); i++)
        {
            for (int j = 0; j < splatmapData.GetLength(1); j++)
            {
                indexXmap = Mathf.Clamp(i/factor, 0, map.GetLength(0) - 1);
                indexYmap = Mathf.Clamp(j/factor, 0, map.GetLength(0) - 1);
                if (map[indexXmap, indexYmap].cellKind == MapCell.CellKind.WALL || map[indexXmap, indexYmap].cellKind == MapCell.CellKind.UNUSED)
                {
                    splatmapData = setSplatWeights(i, j, splatWallWeights, splatmapData);
                }
                else
                {
                    splatmapData = setSplatWeights(i, j, splatFloorWeights, splatmapData);
                }
            }
        }
        terrain.terrainData.SetAlphamaps(0, 0, splatmapData);
        terrain.Flush();
    }