add basic heat transfer #4

half-earth/scripts/WorldGrid.cs

@@ -151,5 +151,13 @@ public class WorldGrid : Node2D
                 _nextValues[x, y] = TransferHeat(t, D, nx, ny, px, py);
             }
         }
+
+        for (int x = 0; x < Size; x++)
+        {
+            for (int y = 0; y < Size; y++)
+            {
+                _tiles[x, y].value = _nextValues[x, y];
+            }
+        }
     }
 }