Switched chunks to factory method, allowing them to be created with or without automatic validation (some ops, like copy, no longer perform unnecessary validation). Skylight recalculation optimization, cuts runtime of flatmap example by two thirds.

Substrate/SubstrateCS/Source/BlockManager.cs

@@ -40,7 +40,7 @@ namespace Substrate
         {
             _chunkMan = cm;
 
-            Chunk c = new Chunk(0, 0);
+            Chunk c = Chunk.Create(0, 0);
 
             _chunkXDim = c.XDim;
             _chunkYDim = c.YDim;

Substrate/SubstrateCS/Source/Chunk.cs

@@ -64,21 +64,35 @@ namespace Substrate
             set { _tree.Root["Level"].ToTagCompound()["TerrainPopulated"].ToTagByte().Data = (byte)(value ? 1 : 0); }
         }
 
-        public Chunk (int x, int z)
+        private Chunk ()
         {
-            _cx = x;
-            _cz = z;
-
-            BuildNBTTree();
-
-            BuildTileEntityCache();
         }
 
-        public Chunk (NBT_Tree tree)
+        public static Chunk Create (int x, int z)
         {
-            if (LoadTreeSafe(tree.Root) == null) {
-                throw new InvalidNBTObjectException();
-            }
+            Chunk c = new Chunk();
+
+            c._cx = x;
+            c._cz = z;
+
+            c.BuildNBTTree();
+            c.BuildTileEntityCache();
+
+            return c;
+        }
+
+        public static Chunk Create (NBT_Tree tree)
+        {
+            Chunk c = new Chunk();
+
+            return c.LoadTree(tree.Root);
+        }
+
+        public static Chunk CreateVerified (NBT_Tree tree)
+        {
+            Chunk c = new Chunk();
+
+            return c.LoadTreeSafe(tree.Root);
         }
 
         private void BuildNBTTree ()
@@ -570,7 +584,7 @@ namespace Substrate
 
         public Chunk Copy ()
         {
-            return new Chunk(_tree.Copy());
+            return Chunk.Create(_tree.Copy());
         }
 
         #endregion

Substrate/SubstrateCS/Source/ChunkFileManager.cs

@@ -92,7 +92,7 @@ namespace Substrate
                 return null;
             }
 
-            return new Chunk(GetChunkTree(cx, cz));
+            return Chunk.CreateVerified(GetChunkTree(cx, cz));
         }
 
         public ChunkRef GetChunkRef (int cx, int cz)
@@ -124,7 +124,7 @@ namespace Substrate
         public ChunkRef CreateChunk (int cx, int cz)
         {
             DeleteChunk(cx, cz);
-            Chunk c = new Chunk(cx, cz);
+            Chunk c = Chunk.Create(cx, cz);
             c.Save(GetChunkOutStream(cx, cz));
 
             ChunkRef cr = ChunkRef.Create(this, this, cx, cz);

Substrate/SubstrateCS/Source/ChunkRef.cs

@@ -52,12 +52,8 @@ namespace Substrate
             get { return _dirty; }
         }
 
-        private ChunkRef (IChunkContainer container, IChunkCache cache, int cx, int cz)
+        private ChunkRef ()
         {
-            _container = container;
-            _cache = cache;
-            _cx = cx;
-            _cz = cz;
         }
 
         public static ChunkRef Create (IChunkContainer container, IChunkCache cache, int cx, int cz)
@@ -66,7 +62,14 @@ namespace Substrate
                 return null;
             }
 
-            return new ChunkRef(container, cache, cx, cz);
+            ChunkRef c = new ChunkRef();
+
+            c._container = container;
+            c._cache = cache;
+            c._cx = cx;
+            c._cz = cz;
+
+            return c;
         }
 
         public int BlockGlobalX (int x)
@@ -480,9 +483,33 @@ namespace Substrate
         {
             GetChunk();
 
+            // Optimization - only need to queue at level of highest neighbor's height
             for (int x = 0; x < XDim; x++) {
                 for (int z = 0; z < ZDim; z++) {
-                    QueueRelight(new BlockKey(x, YDim - 1, z));
+                    ChunkRef ce = LocalChunk(x, 0, z - 1);
+                    ChunkRef cn = LocalChunk(x - 1, 0, z);
+                    ChunkRef cs = LocalChunk(x + 1, 0, z);
+                    ChunkRef cw = LocalChunk(x, 0, z + 1);
+
+                    int h = GetHeight(x, z);
+                    if (ce != null) {
+                        h = Math.Max(h, ce.GetHeight(x, ZDim - 1));
+                    }
+                    if (cn != null) {
+                        h = Math.Max(h, cn.GetHeight(XDim - 1, z));
+                    }
+                    if (cs != null) {
+                        h = Math.Max(h, cs.GetHeight(0, z));
+                    }
+                    if (cw != null) {
+                        h = Math.Max(h, cw.GetHeight(x, 0));
+                    }
+
+                    for (int y = h; y < YDim; y++) {
+                        SetBlockSkyLight(x, y, z, BlockInfo.MAX_LUMINANCE);
+                    }
+
+                    QueueRelight(new BlockKey(x, h, z));
                 }
             }
 

Substrate/SubstrateCS/Source/Region.cs

@@ -257,7 +257,7 @@ namespace Substrate
             int cx = lcx + _rx * ChunkManager.REGION_XLEN;
             int cz = lcz + _rz * ChunkManager.REGION_ZLEN;
 
-            Chunk c = new Chunk(cx, cz);
+            Chunk c = Chunk.Create(cx, cz);
             c.Save(GetChunkOutStream(lcx, lcz));
 
             ChunkRef cr = ChunkRef.Create(this, _cache, lcx, lcz);
@@ -300,7 +300,7 @@ namespace Substrate
                 return null;
             }
 
-            return new Chunk(GetChunkTree(lcx, lcz));
+            return Chunk.CreateVerified(GetChunkTree(lcx, lcz));
         }
 
         public bool ChunkExists (int lcx, int lcz)