Unity 5: Unable to set directBlendParameter values in DirectBlendTree created by editor script

I am working on an editor extension to speed up my workflow which involves creating AnimatorController assets with direct Blendtrees. The following happens in the code:

- AnimatorController created [SUCCESSFUL]
- Appropriate Parameters are added to AnimatorController [SUCCESSFUL]
- Appropriate layers are added to controller [SUCCESSFUL]
- AnimatorStates created using BlendTrees of BlendTreeType.Direct [SUCCESSFUL]
- AnimationClips added to BlendTrees [SUCCESSFUL]
- DirectBlendParameter set for each motion in BlendTree.children [FAILED]

To set the directBlendParameter I am iterating through all children of the blendTree and assigning a string value from the based on the parameters I added to the AnimatorController. That portion of the code looks a bit like this:

Code (csharp):

1.  
2. // NOTE: List<string> parameterList is used in another area of
3. // the code to provide the names of all the AnimatorController.parameters
4. // of type AnimatorControllerParameterType.Float which is successful
5.  
6. for(int i=0; i<targetBlendTree.children.Length; i++)
7. {
8.     targetBlendTree.children[i].directBlendParameter = parameterList[i];
9. }
10.  
11.  

All the ChildMotion properties are successfully set before the loop, but the directBlendParameter value remains set to the default value of "Blend". As ChildMotion.directBlendParameter is a public string, I don't see why this isn't working. Is there an undocumented method to do this or should I report this as a bug in the UnityEditor.Animations API?

 

Thank you so much for this. I completely overlooked the fact that ChildMotion is a struct. I'll be trying out this solution as soon as I'm back at my development machine.

 

Thought I would update this since I have had a chance to test it out now. This worked brilliantly!! I can't thank you enough @Mecanim.Dev