✨ Placement check with collision

Scripts/System/PlacementManager.cs

@@ -24,13 +24,29 @@ public partial class PlacementManager : Node2D
             AddChild(_ghostBuilding);
         }
 
-        _ghostBuilding.Position = GridUtils.GridToWorld(_hoveredCell);
-        _ghostBuilding.SetGhostMode(true);
+        var placementPos = GridUtils.GridToWorld(_hoveredCell);
+        var spaceState = GetWorld2D().DirectSpaceState;
+        var centerPos = placementPos + new Vector2(GridUtils.TileSize / 2f, GridUtils.TileSize / 2f);
+
+        var query = new PhysicsPointQueryParameters2D
+        {
+            Position = centerPos,
+            CollideWithBodies = true,
+            CollideWithAreas = true,
+            CollisionMask = uint.MaxValue // check against all layers/masks
+            // Exclude = new Godot.Collections.Array<Rid>() // optional, see below
+        };
+
+        var collision = spaceState.IntersectPoint(query, 8);
+        var canPlace = Grid.IsCellFree(_hoveredCell) && collision.Count == 0;
+
+        _ghostBuilding.Position = placementPos;
+        _ghostBuilding.SetGhostMode(canPlace);
 
         // Left click to place
-        if (!Input.IsActionPressed("build_tile") || !Grid.IsCellFree(_hoveredCell)) return;
+        if (!Input.IsActionPressed("build_tile") || !canPlace) return;
 
-        _ghostBuilding.SetGhostMode(false);
+        _ghostBuilding.FinalizePlacement();
         Grid.OccupyCell(_hoveredCell, _ghostBuilding);
 
         _ghostBuilding = (BaseTile)BuildingScene.Instantiate();