如何采用导航推测法实现网络同步？

sharewind

我想实现对客户端预测以实现游戏画面的流畅性，不会产生人物位置跳来跳去的结果！
我分别参考了
//英文参考:"Defeating Lag With Cubic Splines" by Nick Caldwell        http://www.gamedev.net/reference/articles/article914.asp
//中文参考：《小谈网络游戏同步》http://dev.gameres.com/Program/Abstract/DeadReckoning.htm

可是感觉实现上还是很有难度。

sharewind

               Coord3 = xpacket + vpacket*t + .5*apacket*t2
                Coord4 = Coord3 -  (Vpacket + apacket*t)

          x= At3 + Bt2 + Ct + D
          y = Et3 + Ft3 + Gt + H


我不知道这两个t 是否相同，并且这个t又是从何处获取的呢？
并且感觉，这个坐标的算法和上面的
Coordinate 1 = Starting position
Coordinate 2 = Position after 1 second using starting velocity
= Coordinate1 + StartVelocity
Coordinate 3 = Position after 1 second using reversed ending velocity
= Coordinate4 － EndVelocity
Coordinate 4 = Ending position


这个第3个和第4个坐标是不是写错了

sharewind

希望有谁做过这方面的来指点一下

sharewind

贴上自己的代码

1. 
   
2. //Update every frame  
   
3. void MoveEventProcess::ExecuteEvent(float fElapsedTime;Mx_ICharacter* pCharacter)
   
4. {
   
5. //The Prediction position
   
6. MxPoint3 ptPredictionPos(0,0,0);
   
7. 
   
8. m_bMovingPrediction = false;
   
9. 
   
10. //Receive new package
    
11. if(!m_queMovePath.empty() && !m_bStartSmooth)
    
12. {
    
13. 
    
14.   m_bStartSmooth = true;
    
15. 
    
16.   //pop the package from the queue
    
17.   MovePath* path = m_queMovePath.front();
    
18.   m_queMovePath.pop_front();
    
19. 
    
20.   //get the velocity and position from package
    
21.   ptVelocityNew = path->m_ptVelocity;
    
22.   ptPosNew = path->oCurve.m_ptDest;
    
23. 
    
24.   //get current position and  velocity
    
25.   ptPosOld = pCharacter->GetTranslate();
    
26.   ptVelocityOld = m_ptLastVelocity;
    
27. 
    
28.   //get  the orientation
    
29.   fDestAngle = path->oCurve.m_fDestAngle;
    
30. 
    
31.   //Safe Realse the path
    
32.   Mx_Safe_Delete(path);
    
33. }
    
34. 
    
35. else if (m_bStartSmooth)
    
36. {
    
37.   //predict for 1 second
    
38.   if (m_fPredictionTime < 1)
    
39.   {
    
40. 
    
41. 
    
42.    ptPredictionPos = CubicSplines(ptPosOld,ptVelocityOld,ptPosNew,ptVelocityNew,m_fPredictionTime);
    
43. 
    
44. 
    
45.    //Change the Character
    
46.    pCharacter->SetTranslate(ptPredictionPos);
    
47.    pCharacter->SetAnimationEvent(m_eLastTrigger);
    
48.    pCharacter->SetOrient(fDestAngle);
    
49. 
    
50.    //add the fElapsedTime
    
51.    m_fPredictionTime  = m_fPredictionTime + fElapsedTime;
    
52. 
    
53.   }
    
54.   else
    
55.   {
    
56.    m_bStartSmooth = false;
    
57.    m_fPredictionTime = 0.0f;
    
58. 
    
59.    //save the new velocity to be a last veloctity
    
60.    m_ptLastVelocity = ptVelocityNew;
    
61.   }
    
62. }
    
63. 
    
64. 
    
65. //Make the character physical movement
    
66. else if (m_queMovePath.empty() && !m_bStartSmooth)
    
67. {
    
68. 
    
69.   //If current state isn't stop
    
70.   if (!m_ptLastVelocity.AlmostEqual(MxPoint3::ZERO))
    
71.   {
    
72.    m_bMovingPrediction = true;
    
73. 
    
74.    //Calculated the position by velocity
    
75.    MxPoint3 ptDisplace = m_ptLastVelocity * fElapsedTime;
    
76.    MxPoint3 ptDest = pCharacter->GetTranslate() + ptDisplace;
    
77. 
    
78.    //Update the Character
    
79.    pCharacter->SetTranslate(ptDest);
    
80.    pCharacter->SetAnimationEvent(m_eLastTrigger);
    
81.   }
    
82. 
    
83. }
    
84. }
    
85. 
    
86. 
    
87. //Cubic Splines Processing
    
88. //
    
89. MxPoint3 MoveEventProcess::CubicSplines(MxPoint3 ptPosOld,MxPoint3 ptVelocityOld,MxPoint3 ptPosNew,MxPoint3 ptVelocityNew,float fTime)
    
90. {
    
91. float t = fTime;
    
92. 
    
93. //新的加速度
    
94. //float fAccelerationNew = 0.f;
    
95. 
    
96. MxPoint3 pos0 = ptPosOld;
    
97. MxPoint3 pos1 = ptPosOld + ptVelocityOld;
    
98. MxPoint3 pos2 = ptPosNew - ptVelocityNew ;
    
99. MxPoint3 pos3 = ptPosNew;
    
100. 
     
101. 
     
102. float A = pos3.x - 3 * pos2.x + 3 * pos1.x - pos0.x;
     
103. float B = 3 * pos2.x - 6 * pos1.x + 3 * pos0.x;
     
104. float C = 3 * pos1.x - 3 * pos0.x;
     
105. float D = pos0.x;
     
106. 
     
107. float E = pos3.y - 3 * pos2.y + 3 * pos1.y - pos0.y;
     
108. float F = 3 * pos2.y - 6 * pos1.y + 3 * pos0.y;
     
109. float G = 3 * pos1.y - 3 * pos0.y;
     
110. float H = pos0.y;
     
111. 
     
112. float I = pos3.z - 3 * pos2.z + 3 * pos1.z - pos0.z;
     
113. float J = 3 * pos2.z - 6 * pos1.z + 3 * pos0.z;
     
114. float K = 3 * pos1.z - 3 * pos0.z;
     
115. float L = pos0.z;
     
116. 
     
117. float t1 = t;
     
118. float t2 = t * t;
     
119. float t3 = t * t * t;
     
120. 
     
121. float x = A * t3  + B * t2 + C * t1 + D;
     
122. float y = E * t3  + F * t2 + G * t1 + H;
     
123. float z = I * t3  + J * t2 + K * t1 + L;
     
124. 
     
125. MxPoint3 pt(x,y,z);
     
126. return pt;
     
127. }
     

复制代码

feilinhe

偶是新手,进来学习学习

sharewind

神啊，来个能回答我问题的人吧…………

huidian200803

我现在也遇到了，看这个那个文档都不知道怎么实现，最后写出来的一顿一顿的

疯子阿虹

有什么可神秘的啊？就是按照你最后收到的速度和方向移动。。。。