angle between vectors in radians

[Bj]

is this a correct statement?

float get_angle_between_in_radians(long double ax, long double ay, long double az, long double bx, long double by, long double bz)
{
    float pi = 3.14159265358979323846;
       float dotproduct, lengtha, lengthb, result;

   dotproduct = (ax * bx) + (ay * by) + (az * bz);
   lengtha = sqrt(ax * ax + ay * ay + az * az);
   lengthb = sqrt(bx * bx + by * by + bz * bz);

   result = acos( dotproduct / (lengtha * lengthb) );

   if(dotproduct < 0)
   {
      if(result > 0)
         result += pi;
      else
         result -= pi;
   }
   return result;
}

also does this actually turn rad to degrees

       y =  y * (57.29577951);

 

[Urwumpe]

Looks correct, but when you use orbiters API, you can do that simpler by using VECTOR3...

I don't know why you have such a complex if statement for correcting the range of the angle...

Also the other statement is 180.0/PI. So it is correct.

 

[simonpro]

Yes, dotproduct is = |a||b|Cos(theta)