Hitting a target

[tod]

I fixed my code and now it seems to work, at the first glance. Here it is:

//prepare values for angle computation
// the distance between the vectors
Real staightDistance = start.distance(stop);
// height on y
Real height = stop.y - start.y;
// distance on local x
Real distance = Math::Sqrt(staightDistance*staightDistance - height*height);
Real speed = getMaxThrowSpeed();
Real gravity = Math::Abs(SettingsManager::getSingleton().getGravity());
// compute angles from horizontal
Radian angle = Math::ATan((Math::Sqr(speed)-Math::Sqrt(Math::Pow(speed,4) - gravity*(gravity*Math::Sqr(distance)+2*height*Math::Sqr(speed))))/(gravity*distance));
//Radian angle = Math::ATan((Math::Sqr(speed)+Math::Sqrt(Math::Pow(speed,4) - gravity*(gravity*Math::Sqr(distance)+2*height*Math::Sqr(speed))))/(gravity*distance));
// compute velocity vector
Vector3 velocity = stop - start;
velocity.y = distance * Math::Tan(angle);
velocity.normalise();
velocity = velocity * speed;

return velocity;

I still have a question, there are two results to the equation, what is the difference between them?

[Julio Jerez]

if you look at the image on wikipedia, you can see that for each target ther are tow diffrent angle tha can hit the same targe. those arehe tow angle you are getting.