Issue with blend and animation orientation on top view 3D shooter

Hello guys,

Got an issue ! I use a blend tree, with 5 blend (iddle, run top, back, left and right).
My charactere can move on X and Z axis and the modele is oriented by the mouse (like every classical 2D top view 3D shooter).

The issue is easy, i use two paramaters for my blend tree, SpeedX and SpeedY (who is in reality "SpeedZ").
But, i want SpeedX and SpeedY as a vector oriented by model of the charactere, so annimation depend of where the body face, and not the world coordinate.

Actually i've got this :

Code (CSharp):

1.         Vector3 movementSpeedForAnimation = new Vector3(InputCatcher.AxisX, 0.0f, InputCatcher.AxisY);
2.         //movementSpeedForAnimation = transform.TransformDirection(movementSpeedForAnimation);
3.  
4.         animator.SetFloat("SpeedX", movementSpeedForAnimation.x);
5.         animator.SetFloat("SpeedY", movementSpeedForAnimation.z);

as you can see, i try to use the transform direction, but not working and got weird result.
can you provide me some help on this point ? Thanks !