// This function will return list of cells pairs that should be connected
public List <(Cell, Cell, Vec3)> CheckNeighbour(GridCell grid_cell, out MovementFlag connection_flags)
{
var result = new List <(Cell, Cell, Vec3)>();
connection_flags = MovementFlag.None;
if (GlobalId == grid_cell.GlobalId || !AABB.Overlaps2D(grid_cell.AABB, true))
{
return(result);
}
foreach (Cell our_cell in Cells)
{
foreach (Cell other_cell in grid_cell.Cells)
{
Vec3 border_point = default(Vec3);
bool should_be_connected = our_cell.ShouldBecomeNeighbours(other_cell, ref border_point);
if (should_be_connected)
{
result.Add((our_cell, other_cell, border_point));
MovementFlag flags = our_cell.Flags & other_cell.Flags;
if (flags > connection_flags)
{
connection_flags = flags;
}
}
}
}
return(result);
}
// Try to connect grid_cell with this cell. Connection can be established only when any two cells of both grid cells are connected. This function should behave
// properly when called multiple times for the same pair of grid cells!
public void AddNeighbour(GridCell grid_cell)
{
if (GlobalId == grid_cell.GlobalId || !AABB.Overlaps2D(grid_cell.AABB, true))
{
return;
}
// this is removed to properly handle merging
//if (Neighbours.Exists(x => x.cell.Equals(grid_cell)))
// return;
bool any_cells_connected = false;
MovementFlag connection_flags = MovementFlag.None;
foreach (Cell our_cell in Cells)
{
foreach (Cell other_cell in grid_cell.Cells)
{
Vec3 border_point = default(Vec3);
bool cells_connected = our_cell.AddNeighbour(other_cell, ref border_point);
if (cells_connected)
{
any_cells_connected = true;
MovementFlag flags = our_cell.Flags & other_cell.Flags;
if (flags > connection_flags)
{
connection_flags = flags;
}
}
}
}
if (any_cells_connected)
{
Neighbour n1 = Neighbours.FirstOrDefault(x => x.cell.GlobalId == grid_cell.GlobalId);
// if they were not connected before, simply connect them
if (n1 == null)
{
Neighbours.Add(new Neighbour(grid_cell, Vec3.ZERO, connection_flags));
grid_cell.Neighbours.Add(new Neighbour(this, Vec3.ZERO, connection_flags));
}
// otherwise verify connection flags
else if (n1.connection_flags < connection_flags)
{
Neighbour n2 = grid_cell.Neighbours.FirstOrDefault(x => x.cell.GlobalId == GlobalId);
n1.connection_flags = connection_flags;
n2.connection_flags = connection_flags;
}
}
}
public bool Overlaps2D(Cell cell, bool tangential_ok = false)
{
return(AABB.Overlaps2D(cell.AABB, tangential_ok));
}
public bool Overlaps2D(Vec3 circle_center, float radius, bool tangential_ok = false)
{
return(AABB.Overlaps2D(circle_center, radius, tangential_ok));
}
// 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 = intersections_aabb.Extend(intersection);
}
}
ExploreCell ex_cell = new ExploreCell(cell_aabb, visited.ToList(), overlapping_grid_cells, m_LastExploreCellId++);
Add(ex_cell);
ex_cell.Small = (ex_cell.CellsArea < MaxAreaToMarkAsSmall) || (ex_cell.CellsAABB.Dimensions.Max() < MaxDimensionToMarkAsSmall);
cells_copy.RemoveWhere(x => visited.Contains(x));
}
return(m_ExploreCells.Count - last_explore_cells_count);
}
}
private int GenerateExploreCells(AABB cell_aabb)
{
// should not happen
//if (m_ExploreCells.Exists(x => x.AABB.Equals(cell_aabb)))
// return;
MovementFlag movement_flags = Navmesh.Navigator.MovementFlags;
//using (new Profiler("[Nav] Nav data generated [{t}]"))
using (Navmesh.AquireReadDataLock())
{
List <Cell> cells = new List <Cell>();
// find all cells inside cell_aabb
foreach (GridCell grid_cell in Navmesh.m_GridCells)
{
if (!cell_aabb.Overlaps2D(grid_cell.AABB))
{
continue;
}
cells.AddRange(grid_cell.Cells.FindAll(x => !x.Replacement && x.HasFlags(movement_flags) && cell_aabb.Overlaps2D(x.AABB)));
}
// add all replaced cells overlapped by explore cell
//cells.AddRange(Navmesh.GetReplacedCells().FindAll(x => x.HasFlags(movement_flags) && cell_aabb.Overlaps2D(x.AABB)));
//create ExploreCell for each interconnected group of cells
List <Cell> cells_copy = new List <Cell>(cells);
int last_explore_cells_count = m_ExploreCells.Count;
while (cells_copy.Count > 0)
{
List <Cell> visited = new List <Cell>();
Algorihms.Visit(cells_copy[0], ref visited, movement_flags, true, 1, -1, cells_copy);
List <AABB> intersections = new List <AABB>();
AABB intersections_aabb = new AABB();
foreach (Cell c in visited)
{
AABB intersection = cell_aabb.Intersect(c.AABB);
intersections.Add(intersection);
intersections_aabb.Extend(intersection);
}
Vec3 nearest_intersection_center = Vec3.Empty;
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, nearest_intersection_center, m_LastExploreCellId++);
Add(ex_cell);
ex_cell.Small = (ex_cell.CellsArea() < MAX_AREA_TO_MARK_AS_SMALL);
cells_copy.RemoveAll(x => visited.Contains(x));
}
return(m_ExploreCells.Count - last_explore_cells_count);
}
}