1 files changed, 115 insertions, 4 deletions

diff --git a/src/physics/PhysicsManager.cs b/src/physics/PhysicsManager.cs
index e5d5bd6..1fee628 100644
--- a/src/physics/PhysicsManager.cs
+++ b/src/physics/PhysicsManager.cs
@@ -46,15 +46,21 @@ namespace PhysicsSystem
                 

                 public PhysicsScene GetPhysicsScene(string engineName)

                 {

-                        if(_plugins.ContainsKey(engineName))

+                    if( String.IsNullOrEmpty( engineName ) )

+                    {

+                return new NullPhysicsScene();

+                    }

+

+                    if(_plugins.ContainsKey(engineName))

                         {

                                 ServerConsole.MainConsole.Instance.WriteLine("creating "+engineName);

                                 return _plugins[engineName].GetScene();

                         }

                         else

                         {

-                                ServerConsole.MainConsole.Instance.WriteLine("couldn't find physicsEngine: "+ engineName);

-                                return null;

+                string error = String.Format("couldn't find physicsEngine: {0}", engineName);

+                                ServerConsole.MainConsole.Instance.WriteLine( error );

+                throw new ArgumentException( error );

                         }

                 }

                 

@@ -108,6 +114,14 @@ namespace PhysicsSystem
         

         public abstract class PhysicsScene

         {

+        public static PhysicsScene Null

+        {

+            get

+            {                

+                return new NullPhysicsScene();

+            }

+        }

+        

                 public abstract PhysicsActor AddAvatar(PhysicsVector position);

                 

                 public abstract PhysicsActor AddPrim(PhysicsVector position, PhysicsVector size);

@@ -124,8 +138,49 @@ namespace PhysicsSystem
                 }

         }

         

+    public class NullPhysicsScene : PhysicsScene

+    {

+        private static int m_workIndicator;

+        

+        public override PhysicsActor AddAvatar(PhysicsVector position)

+        {

+            ServerConsole.MainConsole.Instance.WriteLine("NullPhysicsScene : AddAvatar({0})", position );

+            return PhysicsActor.Null;

+        }

+

+        public override PhysicsActor AddPrim(PhysicsVector position, PhysicsVector size)

+        {

+            ServerConsole.MainConsole.Instance.WriteLine("NullPhysicsScene : AddPrim({0},{1})", position, size );

+            return PhysicsActor.Null;            

+        }

+

+        public override void Simulate(float timeStep)

+        {

+            m_workIndicator = ( m_workIndicator + 1 ) % 10;

+

+            ServerConsole.MainConsole.Instance.SetStatus( m_workIndicator.ToString() );

+        }

+

+        public override void GetResults()

+        {

+            ServerConsole.MainConsole.Instance.WriteLine("NullPhysicsScene : GetResults()" );

+        }

+

+        public override void SetTerrain(float[] heightMap)

+        {

+            ServerConsole.MainConsole.Instance.WriteLine("NullPhysicsScene : SetTerrain({0} items)", heightMap.Length );

+        }

+

+        public override bool IsThreaded

+        {

+            get { return false; }

+        }

+    }

+    

         public abstract class PhysicsActor

         {

+        public static readonly PhysicsActor Null = new NullPhysicsActor();

+            

                 public abstract PhysicsVector Position

                 {

                         get;

@@ -153,7 +208,61 @@ namespace PhysicsSystem
                 public abstract void SetMomentum(PhysicsVector momentum);

         }

 

-        public class PhysicsVector

+    public class NullPhysicsActor : PhysicsActor

+    {

+        public override PhysicsVector Position

+        {

+            get

+            {

+                return PhysicsVector.Zero;

+            }

+            set

+            {

+                return;

+            }

+        }

+

+        public override PhysicsVector Velocity

+        {

+            get

+            {

+                return PhysicsVector.Zero;

+            }

+            set

+            {

+                return;

+            }

+        }

+

+        public override PhysicsVector Acceleration

+        {

+            get { return PhysicsVector.Zero; }

+        }

+

+        public override bool Flying

+        {

+            get

+            {

+                return false;

+            }

+            set

+            {

+                return;

+            }

+        }

+

+        public override void AddForce(PhysicsVector force)

+        {

+            return;

+        }

+

+        public override void SetMomentum(PhysicsVector momentum)

+        {

+            return;

+        }

+    }

+

+    public class PhysicsVector

         {

                 public float X;

                 public float Y;

@@ -170,5 +279,7 @@ namespace PhysicsSystem
                         Y = y;

                         Z = z;

                 }

+

+        public static readonly PhysicsVector Zero = new PhysicsVector(0f, 0f, 0f);

         }

 }