Small bit of Anvil support.

SubstrateCS/Source/Core/NibbleArray.cs

@@ -151,4 +151,73 @@ namespace Substrate.Core
 
         #endregion
     }
+
+    public sealed class YZXNibbleArray : NibbleArray
+    {
+        private readonly int _xdim;
+        private readonly int _ydim;
+        private readonly int _zdim;
+
+        public YZXNibbleArray (int xdim, int ydim, int zdim)
+            : base(xdim * ydim * zdim)
+        {
+            _xdim = xdim;
+            _ydim = ydim;
+            _zdim = zdim;
+        }
+
+        public YZXNibbleArray (int xdim, int ydim, int zdim, byte[] data)
+            : base(data)
+        {
+            _xdim = xdim;
+            _ydim = ydim;
+            _zdim = zdim;
+
+            if (xdim * ydim * zdim != data.Length * 2) {
+                throw new ArgumentException("Product of dimensions must equal half length of raw data");
+            }
+        }
+
+        public byte this[int x, int y, int z]
+        {
+            get
+            {
+                int index = _xdim * (y * _zdim + z) + x;
+                return this[index];
+            }
+
+            set
+            {
+                int index = _xdim * (y * _zdim + z) + x;
+                this[index] = value;
+            }
+        }
+
+        public int XDim
+        {
+            get { return _xdim; }
+        }
+
+        public int YDim
+        {
+            get { return _ydim; }
+        }
+
+        public int ZDim
+        {
+            get { return _zdim; }
+        }
+
+        #region ICopyable<NibbleArray> Members
+
+        public override NibbleArray Copy ()
+        {
+            byte[] data = new byte[Data.Length];
+            Data.CopyTo(data, 0);
+
+            return new YZXNibbleArray(_xdim, _ydim, _zdim, data);
+        }
+
+        #endregion
+    }
 }