Simple grid generation and loading

- Grid generation
- Grid loading
- GridIds
- Still having issues with serialization of the grid data structure

Runtime/SceneGrid.cs

@@ -1,10 +1,9 @@
-using System;
 using System.Collections.Generic;
 using UnityEngine;
 
 namespace VertexColor.ScenePartition.Editor
 {
-    [Serializable]
+    [System.Serializable]
     public class SceneGrid
     {
         [SerializeField]
@@ -13,25 +12,42 @@ namespace VertexColor.ScenePartition.Editor
         [SerializeField]
         private SceneGridDictionary grid = new SceneGridDictionary();
 
-        public void Insert(uint id, Vector2 point)
+        public SceneGridDictionary Grid => grid;
+
+        public void Insert(uint id, Vector3 point)
         {
-            Vector2 gridPos = CalculateGridPosition(point);
-            if (grid.TryGetValue(gridPos, out List<uint> ids))
+            int gridId = CalculateGridPosition(point);
+            if (grid.TryGetValue(gridId, out List<uint> ids))
             {
                 ids.Add(id);
             }
             else
             {
-                grid.Add(gridPos, new List<uint> { id });
+                grid.Add(gridId, new List<uint> { id });
             }
         }
 
-        public Vector2 CalculateGridPosition(Vector2 point)
+        public int CalculateGridPosition(Vector3 point)
         {
             int x = Mathf.FloorToInt(point.x / cellSize);
-            int y = Mathf.FloorToInt(point.y / cellSize);
+            int z = Mathf.FloorToInt(point.z / cellSize);
 
-            return new Vector2(x, y);
+            return IntPairToInt(x, z);
+        }
+
+        public static int IntPairToInt(int x, int y)
+        {
+            // Combine x and y components into a single int
+            return (x << 16) | (ushort)y;
+        }
+
+        public static (int, int) IntToIntPair(int value)
+        {
+            // Extract x and y components from the combined int
+            int x = value >> 16;
+            int y = (short)value;
+
+            return (x, y);
         }
     }
 }

Runtime/SerializedStructures.cs

@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using UnityEngine;
 
 namespace VertexColor.ScenePartition
 {
@@ -10,5 +9,5 @@ namespace VertexColor.ScenePartition
     public class UintSortedSet : SerializableSortedSet<uint> { }
 
     [System.Serializable]
-    public class SceneGridDictionary : SerializableDictionary<Vector2, List<uint>> { }
+    public class SceneGridDictionary : SerializableDictionary<int, List<uint>> { }
 }