Question by discodan · Mar 20, 2017 at 07:16 AM · c#rotation animationclip curves easing

How can I apply easing to a rotation when programmatically creating an AnimationClip?

I'm trying to apply easing to the rotation of an object using the following code. The actual rotation is being applied, but only as a Linear curve (the EaseInOut function call results in a Linear curve). How can I successfully apply easing to the following rotation (z axis rotation only)?

 float startTime = 0.0f;
 float endTime = 0.12f;

 AnimationClip clip = new AnimationClip();
 
 Quaternion quatStart = Quaternion.Euler (new Vector3 (0.0f, 0.0f, 0.0f));
 Quaternion quatEnd = Quaternion.Euler (new Vector3 (0.0f, 0.0f, 30.0f));
 
 AnimationCurve curve_rotate_x = new AnimationCurve ();
 curve_rotate_x.AddKey (startTime, quatStart.x);
 curve_rotate_x.AddKey (endTime, quatEnd.x);
 
 AnimationCurve curve_rotate_y = new AnimationCurve ();
 curve_rotate_y.AddKey (startTime, quatStart.y);
 curve_rotate_y.AddKey (endTime, quatEnd.y);

 // I am only rotating on the z axis.
 // This call to EaseInOut results in a Linear curve!
 AnimationCurve curve_rotate_z = AnimationCurve.EaseInOut (startTime, quatStart.z, endTime, quatEnd.z);
 
 AnimationCurve curve_rotate_w = new AnimationCurve ();
 curve_rotate_w.AddKey (startTime, quatStart.w);
 curve_rotate_w.AddKey (endTime, quatEnd.w);
 
 clip.SetCurve ("InnerObj", typeof(Transform), "localRotation.x", curve_rotate_x);
 clip.SetCurve ("InnerObj", typeof(Transform), "localRotation.y", curve_rotate_y);
 clip.SetCurve ("InnerObj", typeof (Transform), "localRotation.z", curve_rotate_z);
 clip.SetCurve ("InnerObj", typeof (Transform), "localRotation.w", curve_rotate_w);
 
 clip.legacy = false;
 clip.name = "RotationClip";
 clip.wrapMode = WrapMode.Once;
 clip.EnsureQuaternionContinuity ();

When I inspect the generated animation curve resulting from my code it looks like this:

alt text