* Assorted terrain fixes

5 files changed, 168 insertions, 12 deletions

diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Common.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Common.cs
index e6e5a9a..1750418 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Common.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Common.cs
@@ -257,5 +257,21 @@ namespace libTerrain
         {

             return Sum() / (w * h);

         }

+

+        public bool ContainsNaN()

+        {

+            int x, y;

+            for (x = 0; x < w; x++)

+            {

+                for (y = 0; y < h; y++)

+                {

+                    double elm = map[x, y];

+

+                    if (Double.IsNaN(elm))

+                        return true;

+                }

+            }

+            return false;

+        }

     }

 }

diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/File.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/File.cs
index b147004..c0173c0 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/File.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/File.cs
@@ -57,13 +57,16 @@ namespace libTerrain
 

         public void SaveImage(string filename)

         {

+            Channel outmap = this.Copy();

+            outmap.Normalise();

+

             Bitmap bit = new Bitmap(w, h, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

             int x, y;

             for (x = 0; x < w; x++)

             {

                 for (y = 0; y < h; y++)

                 {

-                    int val = Math.Min(255, (int)(map[x,y] * 255));

+                    int val = Math.Min(255, (int)(outmap.map[x,y] * 255));

                     Color col = Color.FromArgb(val,val,val);

                     bit.SetPixel(x, y, col);

                 }

diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Grid.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Grid.cs
index a39db50..e6b18f4 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Grid.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Grid.cs
@@ -43,13 +43,20 @@ namespace libTerrain
 

             int x, y;

 

-            for (x = 0; x < w; x++)

+            if (max != min)

             {

-                for (y = 0; y < h; y++)

+                for (x = 0; x < w; x++)

                 {

-                    map[x, y] = (map[x, y] - min) * (1.0 / (max - min));

+                    for (y = 0; y < h; y++)

+                    {

+                        map[x, y] = (map[x, y] - min) * (1.0 / (max - min));

+                    }

                 }

             }

+            else

+            {

+                this.Fill(0.5);

+            }

 

             return this;

         }

@@ -244,6 +251,76 @@ namespace libTerrain
             map = manipulated;

         }

 

+        public void Distort(Channel mask, double str)

+        {

+            // Simple pertubation filter

+            double[,] manipulated = new double[w, h];

+

+            double amount;

+

+            int x, y;

+            for (x = 0; x < w; x++)

+            {

+                for (y = 0; y < h; y++)

+                {

+                    amount = mask.map[x, y];

+                    double offset_x = (double)x + (amount * str) - (0.5 * str);

+                    double offset_y = (double)y + (amount * str) - (0.5 * str);

+

+                    if (offset_x > w)

+                        offset_x = w - 1;

+                    if (offset_y > h)

+                        offset_y = h - 1;

+                    if (offset_y < 0)

+                        offset_y = 0;

+                    if (offset_x < 0)

+                        offset_x = 0;

+

+                    double p = GetBilinearInterpolate(offset_x, offset_y);

+                    manipulated[x, y] = p;

+                    SetDiff(x, y);

+                }

+            }

+            map = manipulated;

+

+        }

+

+        public void Distort(Channel mask, Channel mask2, double str)

+        {

+            // Simple pertubation filter

+            double[,] manipulated = new double[w, h];

+

+            double amountX;

+            double amountY;

+

+            int x, y;

+            for (x = 0; x < w; x++)

+            {

+                for (y = 0; y < h; y++)

+                {

+                    amountX = mask.map[x, y];

+                    amountY = mask2.map[x, y];

+                    double offset_x = (double)x + (amountX * str) - (0.5 * str);

+                    double offset_y = (double)y + (amountY * str) - (0.5 * str);

+

+                    if (offset_x > w)

+                        offset_x = w - 1;

+                    if (offset_y > h)

+                        offset_y = h - 1;

+                    if (offset_y < 0)

+                        offset_y = 0;

+                    if (offset_x < 0)

+                        offset_x = 0;

+

+                    double p = GetBilinearInterpolate(offset_x, offset_y);

+                    manipulated[x, y] = p;

+                    SetDiff(x, y);

+                }

+            }

+            map = manipulated;

+

+        }

+

         public Channel Blend(Channel other, double amount)

         {

             int x, y;

diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs
index f4dfe1d..fecb748 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs
@@ -76,13 +76,19 @@ namespace libTerrain
         /// <param name="lowest">Drop sediment at the lowest point?</param>

         public void AerobicErosion(double windspeed, double pickupTalusMinimum, double dropTalusMinimum, double carry, int rounds, bool lowest, bool usingFluidDynamics)

         {

+            bool debugImages = true;

+

             Channel wind = new Channel(w, h) ;

             Channel sediment = new Channel(w, h);

             int x, y, i, j;

 

+            this.Normalise();

+

             wind = this.Copy();

-            wind.Normalise();   // Cheap wind calculations

-            wind *= windspeed;

+            wind.Noise();

+

+            if (debugImages)

+                wind.SaveImage("testimg/wind_start.png");

 

             if (usingFluidDynamics)

             {

@@ -90,9 +96,12 @@ namespace libTerrain
             }

             else

             {

-                wind.Pertubation(30);   // Can do better later

+                wind.Pertubation(30);

             }

 

+            if (debugImages)

+                wind.SaveImage("testimg/wind_begin.png");

+

             for (i = 0; i < rounds; i++)

             {

                 // Convert some rocks to sand

@@ -127,7 +136,14 @@ namespace libTerrain
                 if (usingFluidDynamics)

                 {

                     sediment.navierStokes(7, 0.1, 0.0, 0.1);

-                    wind.navierStokes(10, 0.1, 0.0, 0.0);

+

+                    Channel noiseChan = new Channel(w, h);

+                    noiseChan.Noise();

+                    wind.Blend(noiseChan, 0.01);

+

+                    wind.navierStokes(10, 0.1, 0.01, 0.01);

+

+                    sediment.Distort(wind, windspeed);

                 }

                 else

                 {

@@ -137,6 +153,9 @@ namespace libTerrain
                     sediment.seed++;

                 }

 

+                if (debugImages)

+                    wind.SaveImage("testimg/wind_" + i.ToString() + ".png");

+

                 // Convert some sand to rock

                 for (x = 1; x < w - 1; x++)

                 {

@@ -174,11 +193,21 @@ namespace libTerrain
                     }

                 }

 

+                if (debugImages)

+                    sediment.SaveImage("testimg/sediment_" + i.ToString() + ".png");

+

+                wind.Normalise();

+                wind *= windspeed;

+

+                this.Normalise();

             }

 

             Channel myself = this;

             myself += sediment;

             myself.Normalise();

+

+            if (debugImages)

+                this.SaveImage("testimg/output.png");

         }

     }

 }
\ No newline at end of file
diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs
index a035098..8a111ed 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs
@@ -211,11 +211,11 @@ namespace libTerrain
             int i;

             int j;

 

-            for (i = 0; i <= N; i++)

+            for (i = 1; i <= N; i++)

             {

-                for (j = 0; j <= N; j++)

+                for (j = 1; j <= N; j++)

                 {

-                    doubles[i, j] = dens[nsIX(i, j, N)];

+                    doubles[i - 1, j - 1] = dens[nsIX(i, j, N)];

                 }

             }

         }

@@ -229,7 +229,7 @@ namespace libTerrain
             {

                 for (j = 1; j <= N; j++)

                 {

-                    dens[nsIX(i, j, N)] = doubles[i, j];

+                    dens[nsIX(i, j, N)] = doubles[i - 1, j - 1];

                 }

             }

         }

@@ -272,5 +272,36 @@ namespace libTerrain
         {

             nsSimulate(this.h, rounds, dt, diff, visc);

         }

+

+        public void navierStokes(int rounds, double dt, double diff, double visc, ref double[,] uret, ref double[,] vret)

+        {

+            int N = this.h;

+

+            int size = (N * 2) * (N * 2);

+

+            double[] u = new double[size]; // Force, X axis

+            double[] v = new double[size]; // Force, Y axis

+            double[] u_prev = new double[size];

+            double[] v_prev = new double[size];

+            double[] dens = new double[size];

+            double[] dens_prev = new double[size];

+

+            nsDoublesToBuffer(this.map, N, ref dens);

+            nsDoublesToBuffer(this.map, N, ref dens_prev);

+

+            for (int i = 0; i < rounds; i++)

+            {

+                u_prev = u;

+                v_prev = v;

+                dens_prev = dens;

+

+                nsVelStep(N, ref u, ref v, ref u_prev, ref v_prev, visc, dt);

+                nsDensStep(N, ref dens, ref dens_prev, ref u, ref v, diff, dt);

+            }

+

+            nsBufferToDoubles(ref u, N, ref uret);

+            nsBufferToDoubles(ref v, N, ref vret);

+            nsBufferToDoubles(ref dens, N, ref this.map);

+        }

     }

 }
\ No newline at end of file