change internal representation of terrain from int to ushort. This will

suporte height from 0 to 655.53m that includes SL limits ( still need to
 add code to trap eventual negative values from dbs or user input)

OpenSim/Framework/TerrainData.cs

@@ -72,8 +72,8 @@ namespace OpenSim.Framework
             return new HeightmapTerrainData(pSizeX, pSizeY, pSizeZ, pFormatCode, pBlob);
         }
 
-        // return a special compressed representation of the heightmap in ints
+        // return a special compressed representation of the heightmap in ushort
-        public abstract int[] GetCompressedMap();
+        public abstract ushort[] GetCompressedMap();
         public abstract float CompressionFactor { get; }
 
         public abstract float[] GetFloatsSerialized();
@@ -99,7 +99,7 @@ namespace OpenSim.Framework
         Variable2D = 22,
         // Terrain is 'int32, int32, int32, int16[]' where the ints are X and Y dimensions
         //   and third int is the 'compression factor'. The heights are compressed as
-        //   "int compressedHeight = (int)(height * compressionFactor);"
+        //   "ushort compressedHeight = (ushort)(height * compressionFactor);"
         // The dimensions are presumed to be multiples of 16 and, more likely, multiples of 256.
         Compressed2D = 27,
         // A revision that is not listed above or any revision greater than this value is 'Legacy256'.
@@ -109,7 +109,7 @@ namespace OpenSim.Framework
     // Version of terrain that is a heightmap.
     // This should really be 'LLOptimizedHeightmapTerrainData' as it includes knowledge
     //    of 'patches' which are 16x16 terrain areas which can be sent separately to the viewer.
-    // The heighmap is kept as an array of integers. The integer values are converted to
+    // The heighmap is kept as an array of ushorts. The ushort values are converted to
     //    and from floats by TerrainCompressionFactor.
     public class HeightmapTerrainData : TerrainData
     {
@@ -121,7 +121,7 @@ namespace OpenSim.Framework
         {
             get { return FromCompressedHeight(m_heightmap[x, y]); }
             set {
-                int newVal = ToCompressedHeight(value);
+                ushort newVal = ToCompressedHeight(value);
                 if (m_heightmap[x, y] != newVal)
                 {
                     m_heightmap[x, y] = newVal;
@@ -164,7 +164,7 @@ namespace OpenSim.Framework
         // TerrainData.ClearLand(float)
         public override void ClearLand(float pHeight)
         {
-            int flatHeight = ToCompressedHeight(pHeight);
+            ushort flatHeight = ToCompressedHeight(pHeight);
             for (int xx = 0; xx < SizeX; xx++)
                 for (int yy = 0; yy < SizeY; yy++)
                     m_heightmap[xx, yy] = flatHeight;
@@ -214,9 +214,9 @@ namespace OpenSim.Framework
         public override float CompressionFactor { get { return m_compressionFactor; } }
 
         // TerrainData.GetCompressedMap
-        public override int[] GetCompressedMap()
+        public override ushort[] GetCompressedMap()
         {
-            int[] newMap = new int[SizeX * SizeY];
+            ushort[] newMap = new ushort[SizeX * SizeY];
 
             int ind = 0;
             for (int xx = 0; xx < SizeX; xx++)
@@ -230,7 +230,7 @@ namespace OpenSim.Framework
         public override TerrainData Clone()
         {
             HeightmapTerrainData ret = new HeightmapTerrainData(SizeX, SizeY, SizeZ);
-            ret.m_heightmap = (int[,])this.m_heightmap.Clone();
+            ret.m_heightmap = (ushort[,])this.m_heightmap.Clone();
             return ret;
         }
 
@@ -267,19 +267,19 @@ namespace OpenSim.Framework
 
         // =============================================================
 
-        private int[,] m_heightmap;
+        private ushort[,] m_heightmap;
         // Remember subregions of the heightmap that has changed.
         private bool[,] m_taint;
 
         // To save space (especially for large regions), keep the height as a short integer
         //    that is coded as the float height times the compression factor (usually '100'
         //    to make for two decimal points).
-        public int ToCompressedHeight(double pHeight)
+        public ushort ToCompressedHeight(double pHeight)
         {
-            return (int)(pHeight * CompressionFactor);
+            return (ushort)(pHeight * CompressionFactor);
         }
 
-        public float FromCompressedHeight(int pHeight)
+        public float FromCompressedHeight(ushort pHeight)
         {
             return ((float)pHeight) / CompressionFactor;
         }
@@ -293,7 +293,7 @@ namespace OpenSim.Framework
             SizeZ = (int)Constants.RegionHeight;
             m_compressionFactor = 100.0f;
 
-            m_heightmap = new int[SizeX, SizeY];
+            m_heightmap = new ushort[SizeX, SizeY];
             for (int ii = 0; ii < SizeX; ii++)
             {
                 for (int jj = 0; jj < SizeY; jj++)
@@ -315,14 +315,14 @@ namespace OpenSim.Framework
             SizeY = pY;
             SizeZ = pZ;
             m_compressionFactor = 100.0f;
-            m_heightmap = new int[SizeX, SizeY];
+            m_heightmap = new ushort[SizeX, SizeY];
             m_taint = new bool[SizeX / Constants.TerrainPatchSize, SizeY / Constants.TerrainPatchSize];
             // m_log.DebugFormat("{0} new by dimensions. sizeX={1}, sizeY={2}, sizeZ={3}", LogHeader, SizeX, SizeY, SizeZ);
             ClearTaint();
             ClearLand(0f);
         }
 
-        public HeightmapTerrainData(int[] cmap, float pCompressionFactor, int pX, int pY, int pZ) : this(pX, pY, pZ)
+        public HeightmapTerrainData(ushort[] cmap, float pCompressionFactor, int pX, int pY, int pZ) : this(pX, pY, pZ)
         {
             m_compressionFactor = pCompressionFactor;
             int ind = 0;
@@ -401,7 +401,7 @@ namespace OpenSim.Framework
         public Array ToCompressedTerrainSerialization()
         {
             Array ret = null;
-            using (MemoryStream str = new MemoryStream((3 * sizeof(Int32)) + (SizeX * SizeY * sizeof(Int16))))
+            using (MemoryStream str = new MemoryStream((3 * sizeof(Int32)) + (SizeX * SizeY * sizeof(ushort))))
             {
                 using (BinaryWriter bw = new BinaryWriter(str))
                 {
@@ -412,7 +412,7 @@ namespace OpenSim.Framework
                     for (int yy = 0; yy < SizeY; yy++)
                         for (int xx = 0; xx < SizeX; xx++)
                         {
-                            bw.Write((Int16)m_heightmap[xx, yy]);
+                            bw.Write((ushort)m_heightmap[xx, yy]);
                         }
                 }
                 ret = str.ToArray();
@@ -448,7 +448,7 @@ namespace OpenSim.Framework
                     {
                         for (int xx = 0; xx < hmSizeX; xx++)
                         {
-                            Int16 val = br.ReadInt16();
+                            ushort val = br.ReadUInt16();
                             if (xx < SizeX && yy < SizeY)
                                 m_heightmap[xx, yy] = val;
                         }

OpenSim/Region/Framework/Scenes/TerrainChannel.cs

@@ -363,8 +363,8 @@ namespace OpenSim.Region.Framework.Scenes
             public int SizeY;
             public int SizeZ;
             public float CompressionFactor;
-            public int[] Map;
+            public ushort[] Map;
-            public TerrainChannelXMLPackage(int pX, int pY, int pZ, float pCompressionFactor, int[] pMap)
+            public TerrainChannelXMLPackage(int pX, int pY, int pZ, float pCompressionFactor, ushort[] pMap)
             {
                 Version = 1;
                 SizeX = pX;