Adjusting aiming height for players with anti-aim

When playing HvH(Hacks vs. Hacks) in CSS, a feature, known as anti-aim, is often used.
I attached a screenshot of a bot, using anti-aim via the bot_mimic 1 convar:

 

As you can see on the screenshot, aiming at the center of the head hitbox, is not very effective for getting headshots.

I have attached my solution below with comments explaining the code:

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struct Hitbox {  Hitbox( void )  {   hitbox = -1;  }      Hitbox( int newHitBox )  {   hitbox = newHitBox;  }      int  hitbox;  Vector points[9]; };     enum {  FL_HIGH =  (1<<0),  FL_LOW =  (1<<1),  FL_SPECIAL = (1<<2) };     struct BestPoint {  BestPoint( void )  {   hitbox = -1;   point = 0;   index = -1;   dmg = -1;   flags = 0;  }      BestPoint( int newHitBox )  {   hitbox = newHitBox;   point = 0;   index = -1;   dmg = -1;   flags = 0;  }      Vector point;  int  index;  int  dmg;  int  flags;  int  hitbox; };

  

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bool Aimbot::GetHitbox( CSPlayer *targetPlayer, Hitbox *box ) {  matrix3x4_t matrix[MAXSTUDIOBONES];  if ( !targetPlayer->SetupBones( matrix, MAXSTUDIOBONES, BONE_USED_BY_HITBOX, 0 ) )  {   return false;  }      studiohdr_t *studioHeader = g_InterfaceManager->ModelInfo()->GetVTable<IVModelInfo>()->GetStudiomodel( targetPlayer->GetModel() );  if ( !studioHeader )  {   return false;  }      mstudiohitboxset_t *hitboxSet = studioHeader->pHitboxSet( targetPlayer->GetHitboxSet() );  mstudiobbox_t *untransformedBox = hitboxSet->pHitbox( box->hitbox );       // center and all the corners of the hitbox hehe  Vector points[] = { ( ( untransformedBox->bbmin + untransformedBox->bbmax ) * .5f ),   Vector( untransformedBox->bbmin.x, untransformedBox->bbmin.y, untransformedBox->bbmin.z ),   Vector( untransformedBox->bbmin.x, untransformedBox->bbmax.y, untransformedBox->bbmin.z ),   Vector( untransformedBox->bbmax.x, untransformedBox->bbmax.y, untransformedBox->bbmin.z ),   Vector( untransformedBox->bbmax.x, untransformedBox->bbmin.y, untransformedBox->bbmin.z ),   Vector( untransformedBox->bbmax.x, untransformedBox->bbmax.y, untransformedBox->bbmax.z ),   Vector( untransformedBox->bbmin.x, untransformedBox->bbmax.y, untransformedBox->bbmax.z ),   Vector( untransformedBox->bbmin.x, untransformedBox->bbmin.y, untransformedBox->bbmax.z ),   Vector( untransformedBox->bbmax.x, untransformedBox->bbmin.y, untransformedBox->bbmax.z ) };      for ( int index = 0; index <= 8; ++index )  {   if ( index != 0 )   {    // scale down the hitbox size    points[index] =  ( ( ( ( points[index] + points[0] ) * .5f ) + points[index] ) * .5f );   }       // transform the vector   VectorTransform( points[index], matrix[untransformedBox->bone], box->points[index] );     //box.points[index] = this->GetExtrapolatedPosition( box.points[index], targetPlayer );  }    return true; }     bool Aimbot::GetBestPoint( CSPlayer *targetPlayer, Hitbox *box, BestPoint *best ) {  Vector center = box->points[0];    // if we're checking the head hitbox  if ( box->hitbox == 12 )  {   // aimpoints is already 3/4 of hitbox size   Vector high = ( ( box->points[3] + box->points[5] ) * .5f );     // is target looking down?   float pitch = targetPlayer->GetEyeAngles().x;   if ( ( pitch > 0.f )    && ( pitch <= 89.f ) )   {    Vector height = ( ( ( high - box->points[0] ) / 3 ) * 4 );    Vector newhigh = ( box->points[0] + ( height * ( pitch / 89.f ) ) );      box->points[0] = newhigh;    best->flags |= FL_HIGH;   }   // is target looking up?   else if ( ( pitch < 292.5f )    && ( pitch >= 271.f ) )   {    // lower the aimpoint    box->points[0] -= Vector( 0.f, 0.f, 1.f );    best->flags |= FL_LOW;   }  }      for ( int index = 0; index <= 8; ++index )  {   int tmpdmg = GetDamage( box->points[index], targetPlayer );     if ( ( tmpdmg != -1 )    && ( best->dmg < tmpdmg )    && ( ( tmpdmg - best->dmg ) > 1 ) )   {    best->dmg = tmpdmg;    best->point = box->points[index];    best->index = index;   }  }    return ( best->dmg > 0 ); }

Usage should be quite obvious;
Result:

Happy hacking!