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gluLookAtでMultiplyされる行列を自前で作る場合、以下のようにすればokです。

If you want to get the matrix that is generated by gluLookAt, here is the way to do it.

   1    //gluLookAt(
   2    //  eye[0], eye[1], eye[2],
   3    //  at[0], at[1], at[2],
   4    //  0.0, 1.0, 0.0);
   5    // equivalent pseudo code
   6    float lookat[16];
   7    midentity(lookat);
   8    vec3 *s = (vec3*)&lookat[0];
   9    vec3 *u = (vec3*)&lookat[4];
  10    vec3 *f = (vec3*)&lookat[8];
  11    vec3 *t = (vec3*)&lookat[12];
  12    vcpy(t, &eye);
  13    vneg(t);
  14    vsub(f, &at, &eye);
  15    vnormalize(f);    
  16    vec3 up = {0, 1, 0};
  17    vcross(s, f, &up);
  18    vcross(u, s, f);  
  19    vneg(f);      
  20    glMultMatrixf(lookat);

posted by Png takiuchi on Sun 16 Aug 2009 at 14:44
Contents
gluLookAtの等価表現
Comments
Spencer: You don't have to re-compile it, this version w... '14-4
staiano: Any chance we can get a recompile for 10.9? '14-1
falsefalse: @tiancongxin try using this one https://github.... '12-2
tiancongxin: TerminalCopyOnSelect not work on OS X 'Lion' , ... '11-7
staiano: Roderick you rock for recompiling it. Thanks. '11-3
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