// assume Navmesh data lock is aquired
private int GenerateExploreCells(AABB cell_aabb)
{
// should not happen
//if (m_ExploreCells.Exists(x => x.AABB.Equals(cell_aabb)))
// return;
MovementFlag movement_flags = m_Navigator.MovementFlags;
//using (new Profiler("[Nav] Nav data generated [%t]"))
//using (m_Navmesh.AquireReadDataLock())
{
List <Cell> cells = new List <Cell>();
// i'm interested in unique list
HashSet <int> tmp_overlapping_grid_cells = new HashSet <int>();
// find all cells inside cell_aabb
using (m_Navmesh.AcquireReadDataLock())
{
foreach (GridCell grid_cell in m_Navmesh.m_GridCells.Where(x => x.AABB.Overlaps2D(cell_aabb)))
{
tmp_overlapping_grid_cells.Add(grid_cell.Id);
cells.AddRange(grid_cell.GetCells(x => x.HasFlags(movement_flags) && cell_aabb.Overlaps2D(x.AABB), false));
}
}
// for traversing purposes list will be faster
List <int> overlapping_grid_cells = tmp_overlapping_grid_cells.ToList();
//create ExploreCell for each interconnected group of cells
HashSet <Cell> cells_copy = new HashSet <Cell>(cells);
int last_explore_cells_count = m_ExploreCells.Count;
while (cells_copy.Count > 0)
{
HashSet <Cell> visited = new HashSet <Cell>();
using (m_Navmesh.AcquireReadDataLock())
Algorihms.Visit(cells_copy.First(), ref visited, movement_flags, true, 1, -1, cells_copy);
List <AABB> intersections = new List <AABB>();
AABB intersections_aabb = new AABB();
AABB intersection = default(AABB);
foreach (Cell c in visited)
{
if (cell_aabb.Intersect(c.AABB, ref intersection))
{
intersections.Add(intersection);
intersections_aabb.Extend(intersection);
}
}
Vec3 nearest_intersection_center = Vec3.ZERO;
float nearest_intersection_dist = float.MaxValue;
foreach (AABB inter_aabb in intersections)
{
float dist = inter_aabb.Center.Distance2D(intersections_aabb.Center);
if (dist < nearest_intersection_dist)
{
nearest_intersection_center = inter_aabb.Center;
nearest_intersection_dist = dist;
}
}
ExploreCell ex_cell = new ExploreCell(cell_aabb, visited.ToList(), overlapping_grid_cells, nearest_intersection_center, m_LastExploreCellId++);
Add(ex_cell);
ex_cell.Small = (ex_cell.CellsArea() < MaxAreaToMarkAsSmall);
cells_copy.RemoveWhere(x => visited.Contains(x));
}
return(m_ExploreCells.Count - last_explore_cells_count);
}
}
public virtual void OnNavDataChanged(AABB affected_area)
{
RequestReevaluation();
}