Change quaternion FCurve interpolation?

["Agedito" <mislistas(at)agedito.com>]

Hello


I have a rotation animation and I convert it to quaternions with the command: ConvertEulerToQuat();

 

Ok, the quaternions FCurve are spline interpolated and I need to change the interpolation to lineal. I dont found how do it, I'd tryed all the methods but If the FCurve is euler runs but if it's quaternion don't run.

Is posibble to do it by hand in the Animation Editor.  Is there any scripting way?

Thanks in advanced