[Classic] 1.13.2.32089 - Angle from player to point

[NoxiaZ]

Hi,

I struggle with the function to determine the angle from the player to a point/mob, to know if the point/mob is behind.

I have these functions:

public float DotProduct(Vector3 unitPosition)
{
    unitPosition.Z = PlayerPosition.Z;
    var rotation = Quaternion.CreateFromAxisAngle(Vector3.UnitZ, PlayerRotation);
    var forward = Vector3.Normalize(Vector3.Transform(new Vector3(0, 1, 0), rotation));
    var targetDirection = Vector3.Normalize(unitPosition - PlayerPosition);
    var dot = Vector3.Dot(targetDirection, forward);
    return dot;
}

public bool IsBehind(Vector3 unitPosition)
{
    var angle = Angle(unitPosition);
    if (angle <= 180)
    {
        return false;
    }
    else
    {
        return true;
    }
}

public float Angle(Vector3 unitPosition)
{
    unitPosition.Z = PlayerPosition.Z;
    var rotation = Quaternion.CreateFromAxisAngle(Vector3.UnitZ, PlayerRotation);
    var forward = Vector3.Normalize(Vector3.Transform(PlayerPosition, rotation));
    var targetDirection = Vector3.Normalize(PlayerPosition - unitPosition);
    return forward.Angle(targetDirection);
}

The DotProduct, seems to be working well, but the Angle method return different values depending where i stand and look at the mob, any one have solved this, and can tell me what i'm doing wrong?

[ChrisIsMe]

isFacing(Self,Unit)

return ((selfPosX-targetPosX)*math.cos(-Rotation))-((selfPosY-targetPosY)*math.sin(-Rotation)) < 0 or distance(self,target) < 1.5;

[NoxiaZ]

isFacing(Self,Unit)

return ((selfPosX-targetPosX)*math.cos(-Rotation))-((selfPosY-targetPosY)*math.sin(-Rotation)) < 0 or distance(self,target) < 1.5;

Thank you so much, this is working perfectly.
May i ask which language you use?

[ChrisIsMe]

Thank you so much, this is working perfectly.
May i ask which language you use?

C++, this is lua though.