Add a new priority scheme that works like FrontBack, but completely deprioritizes

static prims, creating a hierarchy as follows:
0 == own avatar < other avatars < pysical prims < static prims
For a child agent, simply acts like FrontBack

OpenSim/Region/Framework/Scenes/Prioritizer.cs

@@ -4,6 +4,7 @@ using log4net;
 using Nini.Config;
 using OpenSim.Framework;
 using OpenMetaverse;
+using OpenSim.Region.Physics.Manager;
 
 /*
  * Steps to add a new prioritization policy:
@@ -25,6 +26,7 @@ namespace OpenSim.Region.Framework.Scenes
         Distance = 1,
         SimpleAngularDistance = 2,
         FrontBack = 3,
+        BestAvatarResponsiveness = 4,
     }
 
     public class Prioritizer
@@ -50,6 +52,8 @@ namespace OpenSim.Region.Framework.Scenes
                     return GetPriorityByDistance(client, entity); // TODO: Reimplement SimpleAngularDistance
                 case UpdatePrioritizationSchemes.FrontBack:
                     return GetPriorityByFrontBack(client, entity);
+                case UpdatePrioritizationSchemes.BestAvatarResponsiveness:
+                    return GetPriorityByBestAvatarResponsiveness(client, entity);
                 default:
                     throw new InvalidOperationException("UpdatePrioritizationScheme not defined.");
             }
@@ -130,5 +134,58 @@ namespace OpenSim.Region.Framework.Scenes
 
             return double.NaN;
         }
+
+        private double GetPriorityByBestAvatarResponsiveness(IClientAPI client, ISceneEntity entity)
+        {
+            ScenePresence presence = m_scene.GetScenePresence(client.AgentId);
+            if (presence != null)
+            {
+                // If this is an update for our own avatar give it the highest priority
+                if (presence == entity)
+                    return 0.0;
+
+                // Use group position for child prims
+                Vector3 entityPos = entity.AbsolutePosition;
+                if (entity is SceneObjectPart)
+                    entityPos = m_scene.GetGroupByPrim(entity.LocalId).AbsolutePosition;
+                else
+                    entityPos = entity.AbsolutePosition;
+
+                if (!presence.IsChildAgent)
+                {
+                    if (entity is ScenePresence)
+                        return 1.0;
+
+                    // Root agent. Use distance from camera and a priority decrease for objects behind us
+                    Vector3 camPosition = presence.CameraPosition;
+                    Vector3 camAtAxis = presence.CameraAtAxis;
+
+                    // Distance
+                    double priority = Vector3.DistanceSquared(camPosition, entityPos);
+
+                    // Plane equation
+                    float d = -Vector3.Dot(camPosition, camAtAxis);
+                    float p = Vector3.Dot(camAtAxis, entityPos) + d;
+                    if (p < 0.0f) priority *= 2.0;
+
+                    if (entity is SceneObjectPart)
+                    {
+                        PhysicsActor physActor = ((SceneObjectPart)entity).ParentGroup.RootPart.PhysActor;
+                        if (physActor == null || !physActor.IsPhysical)
+                            priority+=100;
+                    }
+                    return priority;
+                }
+                else
+                {
+                    // Child agent. Use the normal distance method
+                    Vector3 presencePos = presence.AbsolutePosition;
+
+                    return Vector3.DistanceSquared(presencePos, entityPos);
+                }
+            }
+
+            return double.NaN;
+        }
     }
 }