Bugfixes for creating new worlds/regions/chunks

Substrate/SubstrateCS/Source/ChunkManager.cs

@@ -246,9 +246,6 @@ namespace Substrate
                         }
                         if (MoveNextInRegion()) {
                             _chunk = _region.GetChunkRef(_x, _z, _cm);
-                            if (_chunk == null) {
-                                throw new Exception();
-                            }
                             return true;
                         }
                     }

Substrate/SubstrateCS/Source/ChunkRef.cs

@@ -576,6 +576,10 @@ namespace Substrate
 
         private ChunkRef LocalChunk (int lx, int ly, int lz)
         {
+            if (ly < 0 || ly >= YDim) {
+                return null;
+            }
+
             if (lx < 0) {
                 if (lz < 0) {
                     return _container.GetChunkRef(_cx - 1, _cz - 1);

Substrate/SubstrateCS/Source/RegionFile.cs

@@ -102,6 +102,8 @@ namespace Substrate
                             file.Write(int0, 0, 4);
                         }
 
+                        file.Flush();
+
                         sizeDelta += SECTOR_BYTES * 2;
                     }
 
@@ -110,6 +112,8 @@ namespace Substrate
                         for (int i = 0; i < (file.Length & 0xfff); ++i) {
                             file.WriteByte(0);
                         }
+
+                        file.Flush();
                     }
 
                     /* set up the available sector map */

Substrate/SubstrateCS/Source/RegionManager.cs

@@ -60,9 +60,14 @@ namespace Substrate
             Region r = GetRegion(rx, rz);
             if (r == null) {
                 string fp = "r." + rx + "." + rz + ".mcr";
-                new RegionFile(Path.Combine(_regionPath, fp));
+                using (RegionFile rf = new RegionFile(Path.Combine(_regionPath, fp))) {
+                    
+                }
 
                 r = new Region(this, rx, rz);
+
+                RegionKey k = new RegionKey(rx, rz);
+                _cache[k] = r;
             }
 
             return r;

Substrate/SubstrateCS/Source/World.cs

@@ -335,6 +335,11 @@ namespace Substrate
                 throw new DirectoryNotFoundException("Directory '" + path + "' not found");
             }
 
+            string regpath = Path.Combine(path, _REGION_DIR);
+            if (!Directory.Exists(regpath)) {
+                Directory.CreateDirectory(regpath);
+            }
+
             _path = path;
             _level = new Level(this);