1

How can I add a new created AnimationCurve to an AnimationClip by Script?

This is about the float curves that update Animator Parameters with identical names.
I can do this by Hand using the Animations tab of the Animation Import Settings.

Unity Documentation: Animation Curves on Imported Clips

But for an InspectorTool on a StateMachineBehaviour I would need to add and edit new curves by script (and edit existing ones).

I have been able to get all existing curves of the used animation clip.
Unfortunately I didn’t find a possibility to distinguish between the normal bone animation curves and the parameter curves. Luckily I could work around this by checking their names.

When I add a Curve to the animationClip it is in the complete list - so obviously that works. But I want to add a Parameter Curve…

Anyone an Idea?

2

After some time with IL-Spy I finally got it working like this:

The Parameter AnimationCurves are stored into the metafiles of the imported FBX files - so to get the changes permanently it is necessary to work with the SerializedProperty m_ClipAnimations of the Modelimporter.

I needed this in a CustomInspector of a StateMachineBehaviour - If you don’t skip Step 1.

  1. Get the used AnimationClip of the
    inspected StateMachineBehaviour with
    Unitys
    [StateMachineBehaviourContext][1]

  2. Get the instance of the used
    ModelImporter for that AnimationClip
    and create the SerializedObject of
    it.

  3. Now this is the SerializedProperty of the AnimationClip used by this StateMachineBehaviour - to get the Parameter driving AnimationCurves search for the property “curves”.

    protected StateMachineBehaviour m_behaviour;
protected StateMachineBehaviourContext[] m_context;
protected AnimatorController m_animController;
protected string m_assetPath;
protected AnimationClip m_clip;
protected ModelImporter m_importer;
protected SerializedObject m_importerSObj;

    public virtual void OnEnable()
    {
    // STEP 1
    m_behaviour = target as StateMachineBehaviour;
    m_context = AnimatorController.FindStateMachineBehaviourContext(m_behaviour);
    m_context = AnimatorController.FindStateMachineBehaviourContext(m_behaviour);
    if (m_context != null)
    {
    // animatorObject can be an AnimatorState or AnimatorStateMachine
    m_animController = m_context[0].animatorController;
    AnimatorState state = m_context[0].animatorObject as AnimatorState;
    if (state != null)
    {
    m_clip = state.motion as AnimationClip;
    if (m_clip != null)
    {
    // STEP 2
    m_assetPath = AssetDatabase.GetAssetPath(m_clip);
    m_importer = (ModelImporter)AssetImporter.GetAtPath(m_assetPath);
    m_importerSObj = new SerializedObject(m_importer);
    SerializedProperty clipProp = m_importerSObj.FindProperty(“m_ClipAnimations”);
    for (int i = 0; i < m_importer.clipAnimations.Length; i++)
    {
    if (m_clip.name == m_importer.clipAnimations*.name)*
    {
    //STEP 3
    clipProp.GetArrayElementAtIndex(i); // the AnimationClip Property
    }
    }
    }
    }
    }
    }
    [1]: Unity - Scripting API: StateMachineBehaviourContext