1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
using System;
using System.Collections.Generic;
using log4net;
using Nini.Config;
using OpenSim.Framework;
using OpenMetaverse;
namespace OpenSim.Region.Framework.Scenes
{
public enum UpdatePrioritizationSchemes
{
Time = 0,
Distance = 1,
SimpleAngularDistance = 2,
FrontBack = 3,
}
public class Prioritizer
{
private static readonly ILog m_log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
private Scene m_scene;
public Prioritizer(Scene scene)
{
m_scene = scene;
}
public double GetUpdatePriority(IClientAPI client, ISceneEntity entity)
{
switch (m_scene.UpdatePrioritizationScheme)
{
case UpdatePrioritizationSchemes.Time:
return GetPriorityByTime();
case UpdatePrioritizationSchemes.Distance:
return GetPriorityByDistance(client, entity);
case UpdatePrioritizationSchemes.SimpleAngularDistance:
return GetPriorityByDistance(client, entity);
case UpdatePrioritizationSchemes.FrontBack:
return GetPriorityByFrontBack(client, entity);
default:
throw new InvalidOperationException("UpdatePrioritizationScheme not defined.");
}
}
private double GetPriorityByTime()
{
return DateTime.UtcNow.ToOADate();
}
private double GetPriorityByDistance(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 the camera position for local agents and avatar position for remote agents
Vector3 presencePos = (presence.IsChildAgent) ?
presence.AbsolutePosition :
presence.CameraPosition;
// Use group position for child prims
Vector3 entityPos;
if (entity is SceneObjectPart)
entityPos = m_scene.GetGroupByPrim(entity.LocalId).AbsolutePosition;
else
entityPos = entity.AbsolutePosition;
return Vector3.DistanceSquared(presencePos, entityPos);
}
return double.NaN;
}
private double GetPriorityByFrontBack(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)
{
// 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;
return priority;
}
else
{
// Child agent. Use the normal distance method
Vector3 presencePos = presence.AbsolutePosition;
return Vector3.DistanceSquared(presencePos, entityPos);
}
}
return double.NaN;
}
}
}
|
