// Aquires DataLock (read)
private bool RayCast(Vec3 from, Cell from_cell, Vec3 to, MovementFlag flags, bool test_2d, bool ignore_movement_cost, ref HashSet <Cell> ignored_cells)
{
using (new ReadLock(DataLock))
{
if (to.IsEmpty)
{
return(false);
}
if (from_cell == null && !GetCellContaining(from, out from_cell, ignored_cells, false, flags, test_2d, 2))
{
return(false);
}
if (test_2d ? from_cell.Contains2D(to) : from_cell.Contains(to, 2))
{
return(true);
}
ignored_cells.Add(from_cell);
Vec3 ray_dir = to - from;
if (test_2d)
{
ray_dir.Normalize2D();
}
else
{
ray_dir.Normalize();
}
Vec3 ray_origin = new Vec3(from);
// raycast through neighbours
foreach (Cell.Neighbour neighbour in from_cell.Neighbours)
{
if (neighbour.cell.Disabled || (neighbour.connection_flags & flags) != flags || (!ignore_movement_cost && neighbour.cell.MovementCostMult > from_cell.MovementCostMult))
{
continue;
}
Cell neighbour_cell = neighbour.cell;
if (ignored_cells.Contains(neighbour_cell))
{
continue;
}
Vec3 intersection = null;
bool ray_test_result = test_2d ? neighbour_cell.AABB.RayTest2D(ray_origin, ray_dir, out intersection) :
neighbour_cell.AABB.RayTest(ray_origin, ray_dir, out intersection);
// ray intersects on connection plane
if (ray_test_result)
{
AABB shared_aabb = test_2d ? from_cell.AABB.Intersect2D(neighbour_cell.AABB, true) :
from_cell.AABB.Intersect(neighbour_cell.AABB, true);
if (shared_aabb != null)
{
bool accepted = test_2d ? shared_aabb.Contains2D(intersection) :
shared_aabb.Contains(intersection);
if (accepted && RayCast(intersection, neighbour_cell, to, flags, test_2d, ignore_movement_cost, ref ignored_cells))
{
return(true);
}
}
}
}
return(false);
}
}