* Aerobic erosion now uses Navier Stokes algorithms for wind calculations.

3 files changed, 27 insertions, 10 deletions

diff --git a/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs b/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
index 5ef2963..2e40531 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/TerrainEngine.cs
@@ -409,7 +409,7 @@ namespace OpenSim.Region.Terrain
             {
                 case "aerobic":
                     // WindSpeed, PickupMinimum,DropMinimum,Carry,Rounds,Lowest
-                    heightmap.AerobicErosion(Convert.ToDouble(args[2]), Convert.ToDouble(args[3]), Convert.ToDouble(args[4]), Convert.ToDouble(args[5]), Convert.ToInt32(args[6]), Convert.ToBoolean(args[7]));
+                    heightmap.AerobicErosion(Convert.ToDouble(args[2]), Convert.ToDouble(args[3]), Convert.ToDouble(args[4]), Convert.ToDouble(args[5]), Convert.ToInt32(args[6]), Convert.ToBoolean(args[7]), true);
                     break;
                 case "thermal":
                     heightmap.thermalWeathering(Convert.ToDouble(args[2]), Convert.ToInt32(args[3]), Convert.ToDouble(args[4]));
diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs
index 870b9b2..97c2762 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/AerobicErosion.cs
@@ -74,7 +74,7 @@ namespace libTerrain
         /// <param name="carry">The percentage of rock which can be picked up to pickup 0..1</param>

         /// <param name="rounds">The number of erosion rounds (recommended: 25+)</param>

         /// <param name="lowest">Drop sediment at the lowest point?</param>

-        public void AerobicErosion(double windspeed, double pickup_talus_minimum, double drop_talus_minimum, double carry, int rounds, bool lowest)

+        public void AerobicErosion(double windspeed, double pickup_talus_minimum, double drop_talus_minimum, double carry, int rounds, bool lowest, bool usingFluidDynamics)

         {

             Channel wind = new Channel(w, h) ;

             Channel sediment = new Channel(w, h);

@@ -83,7 +83,15 @@ namespace libTerrain
             wind = this.copy();

             wind.normalise();   // Cheap wind calculations

             wind *= windspeed;

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

+

+            if (usingFluidDynamics)

+            {

+                wind.navierStokes(20, 0.1, 0.0, 0.0);

+            }

+            else

+            {

+                wind.pertubation(30);   // Can do better later

+            }

 

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

             {

@@ -115,10 +123,19 @@ namespace libTerrain
                         }

                     }

                 }

-                sediment.pertubation(10); // Sediment is blown around a bit

-                sediment.seed++;

-                wind.pertubation(15);   // So is the wind

-                wind.seed++;

+

+                if (usingFluidDynamics)

+                {

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

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

+                }

+                else

+                {

+                    wind.pertubation(15);   // Can do better later

+                    wind.seed++;

+                    sediment.pertubation(10); // Sediment is blown around a bit

+                    sediment.seed++;

+                }

 

                 // Convert some sand to rock

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

diff --git a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs
index f01b2860..43987d4 100644
--- a/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs
+++ b/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Manipulators/NavierStokes.cs
@@ -248,9 +248,9 @@ namespace libTerrain
         /// Performs computational fluid dynamics on a channel

         /// </summary>

         /// <param name="rounds">The number of steps to perform (Recommended: 20)</param>

-        /// <param name="dt">Delta Time - The time between steps</param>

-        /// <param name="diff">Fluid diffusion rate</param>

-        /// <param name="visc">Fluid viscosity</param>

+        /// <param name="dt">Delta Time - The time between steps (Recommended: 0.1)</param>

+        /// <param name="diff">Fluid diffusion rate (Recommended: 0.0)</param>

+        /// <param name="visc">Fluid viscosity (Recommended: 0.0)</param>

         public void navierStokes(int rounds, double dt, double diff, double visc)

         {

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