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Are sin/cos boken/non-standard in pspdev?

 
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Kojima



Joined: 26 Jun 2006
Posts: 275
PostPosted: Sat Jul 22, 2006 9:42 pm    Post subject: Are sin/cos boken/non-standard in pspdev? Reply with quote
Are sin/cos different than usual implentations? I ask cos I've experienced a number of problems when porting the rotation/matrix code of my engine.

I convert the angle (In range of 0-360) to a radian and log the output in a txt file. the output is below.
Note the dramatic change in output from angle 1 to angle 2.

Here's my degree to radian function,

Code:

const float PI = 3.14159265;

inline float DegToRad(float ang)
{

   return ang*180.0f/PI;
}



Code:

Angle:1
 Cos Output:0.733657
 
Angle:2
 Cos Output:0.076504
 
Angle:3
 Cos Output:-0.621401
 
Angle:4
 Cos Output:-0.988294
 
Angle:5
 Cos Output:-0.828736
 
Angle:6
 Cos Output:-0.227722
 
Angle:7
 Cos Output:0.494597
 
Angle:8
 Cos Output:0.953451
 
Angle:9
 Cos Output:0.904414
 
Angle:10
 Cos Output:0.373608
 
Angle:11
 Cos Output:-0.356214
 
Angle:12
 Cos Output:-0.896286
 
Angle:13
 Cos Output:-0.958918
 
Angle:14
 Cos Output:-0.510747
 
Angle:15
 Cos Output:0.209491
 
Angle:16
 Cos Output:0.818137
 
Angle:17
 Cos Output:0.990972
 
Angle:18
 Cos Output:0.635929
 
Angle:19
 Cos Output:-0.057864
 
Angle:20
 Cos Output:-0.720834
 
Angle:21
 Cos Output:-0.999825
 
Angle:22
 Cos Output:-0.746223
 
Angle:23
 Cos Output:-0.095118
 
Angle:24
 Cos Output:0.606656
 
Angle:25
 Cos Output:0.985272
 
Angle:26
 Cos Output:0.839047
 
Angle:27
 Cos Output:0.245873
 
Angle:28
 Cos Output:-0.478274
 
Angle:29
 Cos Output:-0.947651
 
Angle:30
 Cos Output:-0.912227
 
Angle:31
 Cos Output:-0.390871
 
Angle:32
 Cos Output:0.338696
 
Angle:33
 Cos Output:0.887844
 
Angle:34
 Cos Output:0.964050
 
Angle:35
 Cos Output:0.526719
 
Angle:36
 Cos Output:-0.191188
 
Angle:37
 Cos Output:-0.807324
 
Angle:38
 Cos Output:-0.993303
 
Angle:39
 Cos Output:-0.650143
 
Angle:40
 Cos Output:0.039204
 
Angle:41
 Cos Output:0.707846
 
Angle:42
 Cos Output:0.999302
 
Angle:43
 Cos Output:0.758450
 
Angle:44
 Cos Output:0.113698
 
Angle:45
 Cos Output:-0.591797
 
Angle:46
 Cos Output:-0.981905
 
Angle:47
 Cos Output:-0.849000
 
Angle:48
 Cos Output:-0.263938
 
Angle:49
 Cos Output:0.461893
 
Angle:50
 Cos Output:0.941520
 
Angle:51
 Cos Output:0.919673
 
Angle:52
 Cos Output:0.407999
 
Angle:53
 Cos Output:-0.321175
 
Angle:54
 Cos Output:-0.879093
 
Angle:55
 Cos Output:-0.968816
 
Angle:56
 Cos Output:-0.542507
 
Angle:57
 Cos Output:0.172938
 
Angle:58
 Cos Output:0.796085
 
Angle:59
 Cos Output:0.995277
 
Angle:60
 Cos Output:0.664315
 
Angle:61
 Cos Output:-0.020652
 
Angle:62
 Cos Output:-0.694439
 
Angle:63
 Cos Output:-0.998437
 
Angle:64
 Cos Output:-0.770570
 
Angle:65
 Cos Output:-0.132117
 
Angle:66
 Cos Output:0.576535
 
Angle:67
 Cos Output:0.978221
 
Angle:68
 Cos Output:0.858785
 
Angle:69
 Cos Output:0.281794
 
Angle:70
 Cos Output:-0.445134
 
Angle:71
 Cos Output:-0.935105
 
Angle:72
 Cos Output:-0.926894
 
Angle:73
 Cos Output:-0.424873
 
Angle:74
 Cos Output:0.303543
 
Angle:75
 Cos Output:0.869975
 
Angle:76
 Cos Output:0.973304
 
Angle:77
 Cos Output:0.558005
 
Angle:78
 Cos Output:-0.154628
 
Angle:79
 Cos Output:-0.784867
 
Angle:80
 Cos Output:-0.996926
 
Angle:81
 Cos Output:-0.678073
 
Angle:82
 Cos Output:0.002093
 
Angle:83
 Cos Output:0.681144
 
Angle:84
 Cos Output:0.997209
 
Angle:85
 Cos Output:0.782267
 
Angle:86
 Cos Output:0.150492
 
Angle:87
 Cos Output:-0.561473
 
Angle:88
 Cos Output:-0.974146
 
Angle:89
 Cos Output:-0.868146
 
Angle:90
 Cos Output:-0.299553
 
Angle:91
 Cos Output:0.428658
 
Angle:92
 Cos Output:0.928276
 
Angle:93
 Cos Output:0.933701
 
Angle:94
 Cos Output:0.441601
 
Angle:95
 Cos Output:-0.285807
 
Angle:96
 Cos Output:-0.860674
 
Angle:97
 Cos Output:-0.977396
 
Angle:98
 Cos Output:-0.573310
 
Angle:99
 Cos Output:0.136265
 
Angle:100
 Cos Output:0.772922
 
Angle:101
 Cos Output:0.998208
 
Angle:102
 Cos Output:0.691597
 
Angle:103
 Cos Output:0.016467
 
Angle:104
 Cos Output:-0.667074
 
Angle:105
 Cos Output:-0.995652
 
Angle:106
 Cos Output:-0.793693
 
Angle:107
 Cos Output:-0.168814
 
Angle:108
 Cos Output:0.545610
 
Angle:109
 Cos Output:0.969785
 
Angle:110
 Cos Output:0.877208
 
Angle:111
 Cos Output:0.317208
 
Angle:112
 Cos Output:-0.411371
 
Angle:113
 Cos Output:-0.921214
 
Angle:114
 Cos Output:-0.940185
 
Angle:115
 Cos Output:-0.458176
 
Angle:116
 Cos Output:0.267502
 
Angle:117
 Cos Output:0.851076
 
Angle:118
 Cos Output:0.981151
 
Angle:119
 Cos Output:0.588418
 
Angle:120
 Cos Output:-0.117371
 
Angle:121
 Cos Output:-0.761012
 
Angle:122
 Cos Output:-0.999147
 
Angle:123
 Cos Output:-0.704884
 
Angle:124
 Cos Output:-0.035509
 
Angle:125
 Cos Output:0.653133
 
Angle:126
 Cos Output:0.993751
 
Angle:127
 Cos Output:0.804847
 
Angle:128
 Cos Output:0.187557
 
Angle:129
 Cos Output:-0.529962
 
Angle:130
 Cos Output:-0.965090
 
Angle:131
 Cos Output:-0.885967
 
Angle:132
 Cos Output:-0.335215
 
Angle:133
 Cos Output:0.394384
 
Angle:134
 Cos Output:0.913834
 
Angle:135
 Cos Output:0.946346
 
Angle:136
 Cos Output:0.475024
 
Angle:137
 Cos Output:-0.249573
 
Angle:138
 Cos Output:-0.841185
 
Angle:139
 Cos Output:-0.984569
 
Angle:140
 Cos Output:-0.603712
 
Angle:141
 Cos Output:0.098919
 
Angle:142
 Cos Output:0.748841
 
Angle:143
 Cos Output:0.999752
 
Angle:144
 Cos Output:0.718267
 
Angle:145
 Cos Output:0.054051
 
Angle:146
 Cos Output:-0.638966
 
Angle:147
 Cos Output:-0.991508
 
Angle:148
 Cos Output:-0.815723
 
Angle:149
 Cos Output:-0.205277
 
Angle:150
 Cos Output:0.513713
 
Angle:151
 Cos Output:0.959926
 
Angle:152
 Cos Output:0.894640
 
Angle:153
 Cos Output:0.352643
 
Angle:154
 Cos Output:-0.377261
 
Angle:155
 Cos Output:-0.906140
 
Angle:156
 Cos Output:-0.952180
 
Angle:157
 Cos Output:-0.490849
 
Angle:158
 Cos Output:0.232033
 
Angle:159
 Cos Output:0.830732
 
Angle:160
 Cos Output:0.987723
 
Angle:161
 Cos Output:0.618404
 
Angle:162
 Cos Output:-0.080434
 
Angle:163
 Cos Output:-0.736412
 
Angle:164
 Cos Output:-0.999991
 
Angle:165
 Cos Output:-0.730723
 
Angle:166
 Cos Output:-0.072087
 
Angle:167
 Cos Output:0.624198
 
Angle:168
 Cos Output:0.988851
 
Angle:169
 Cos Output:0.826593
 
Angle:170
 Cos Output:0.223882
 
Angle:171
 Cos Output:-0.498125
 
Angle:172
 Cos Output:-0.954705
 
Angle:173
 Cos Output:-0.902568
 
Angle:174
 Cos Output:-0.369495
 
Angle:175
 Cos Output:0.359552
 
Angle:176
 Cos Output:0.897919
 
Angle:177
 Cos Output:0.957827
 
Angle:178
 Cos Output:0.507355
 
Angle:179
 Cos Output:-0.213463
 
Angle:180
 Cos Output:-0.820536


Here's the actual code I used to generate the output. It relies havily on my engine so you won't be able to run it without some modifcation. sorry.

Code:

   while(1)
  {
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);      // Clear The Screen And The Depth Buffer
      //vcam->Move(0,0,0);
   //   vcam->Other(joy->_x,0,joy->_y);
      glLoadIdentity();
      
     joy->Update();
       
       cy++;
       if(cy>360) cy=0;
       //vcam->Rotate(cp,cy,0);
            
     
     //FontRenderer->RenderText(0,0,"Gui Test Alpha 1");
 
   
       Renderer->RenderScene();     
       
       sys->Draw2D();
       
       if( !(yawtxt == NULL ) )
       {
          free( (void *)yawtxt );
       }
       
       angtxt = StringUtil->Num( (int)cy );
       yawtxt = StringUtil->Num( (float)cos(DegToRad(cy)) );
       FontRenderer->RenderText( 0,0,angtxt );
       FontRenderer->RenderText( 0,20,yawtxt );
     
      Logger->Log("Angle:%s Cos Output:%s \n",angtxt,yawtxt );
     
    //   sys->Draw2D();
      if(joy->_select==1)
      {
         sceKernelExitGame();
      }
     if( joy->_rtrigger )
     {
        screenshot("mplay");
     }
     glutSwapBuffers();
  }



So are sin/cos different than say visual C++ or Blitzmax? If not degrees or radians as input, what else could it be? Any help would be much appreciated, this has completely stalled our game.
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jockyw2001



Joined: 29 Sep 2005
Posts: 339
PostPosted: Sat Jul 22, 2006 9:48 pm    Post subject: Reply with quote
if you convert from degree to radian the formula is:
return ang*PI/180.0f;
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Kojima



Joined: 26 Jun 2006
Posts: 275
PostPosted: Sat Jul 22, 2006 9:49 pm    Post subject: Reply with quote
You're right Jock, I just checked and I mistakenly used the same code as I did for RadToDeg. Thanks for the spot.
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