Blend Tree code example

Unity Engine
1

Hello everyone,
I’ve trying to find some examples of working with Blend Trees by code, without luck.
Specifically, I’m trying to add some animation clips dynamically to a blend tree and then use some parameter in order to tweak the blend tree. Could you guys provide with an example and/or post some code?

Thanks in advance,

1 Like
2

Taken directly from our Runtime test,
It does create a controller,
add a parameter called BlendEvent
Create a blend tree and setup two clip

By default blend tree a created as Simple1D

var runClip = (AnimationClip)AssetDatabase.LoadAssetAtPath("Assets/Mecanim/run.fbx", typeof(AnimationClip));
var strafeClip = (AnimationClip)AssetDatabase.LoadAssetAtPath("Assets/Mecanim/strafe.fbx", typeof(AnimationClip));
var controller = UnityEditor.Animations.AnimatorController.CreateAnimatorControllerAtPath("Assets/Mecanim/CanBlendToState.controller");
 controller.AddParameter("BlendEvent", AnimatorControllerParameterType.Float);

UnityEditor.Animations.BlendTree blendTree;
controller.CreateBlendTreeInController("BlendState", out blendTree, 0);
blendTree.name = "Blend Tree";
blendTree.blendParameter = "BlendEvent";
blendTree.AddChild(runClip);
blendTree.AddChild(strafeClip);
3 Likes
3

Thanks so much for your response.
And how can I add an exit transition to the blendTree from there?

4 
Animations.AnimatorState state = controller.CreateBlendTreeInController("BlendState", out blendTree, 0);
state.AddExitTransition();
1 Like
5

I know is an old topic but does this works in the build too? or just in the Editor mode

6

it does only work in the editor, you cannot modify a controller at runtime

7

My Animancer plugin would let you do this dynamically at runtime as shown in this image: .

8

U did use unityEditor, it is not possble to use this code on runtime such as webgl or mobile publish etc.

9

It’s very helpful. but how to add a blend tree in a sub-state machine in code?