Look at

ExtensionLookAt.cs

public static class EntityExtensions
    {
        public static void LookAt(this Entity e, Vector3 target)
        {
            float azimuth = GetLookAtAngles(e.Transform.Position, target, out float altitude);
            var result = Quaternion.RotationYawPitchRoll(azimuth, -altitude, 0);
            e.Transform.Rotation = result;
        }
        public static Vector3 Position(this Entity e) => e.Transform.Position;
        private static float GetLookAtAngles(Vector3 source, Vector3 destination, out float altitude)
        {
            var x = source.X - destination.X;
            var y = source.Y - destination.Y;
            var z = source.Z - destination.Z;

            altitude = (float)Math.Atan2(y, Math.Sqrt(x * x + z * z));
            var azimuth = (float)Math.Atan2(x, z);
            return azimuth;
        }

    }