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[Unity] Best Way To Override Only Certain Bones

ryanplymire

Anyone have any insight into this? For example, I have a swing sword animation, and a run, jump, etc. animation. I want the swing sword to only rotate the arm. However, if I specify zero mix in unity, the rest of the body doesn't move. If I add some mix, like 0.2, you don't see the full sword swing and the sword only swings partially. How can I override just some parts of the animation?

I also noticed an issue if I do too much mixing it won't hide some attachments at the end of the animation like it is supposed to. So if I mix a sword swing into a run, and the mix is above 0.3 or so, the sword won't get put away (hidden) afterwards.

Pharan

This is done both on the code side and in Spine editor.

In the editor, make animations that key body bones for running and jumping and whatever.
Also make an animation for swinging the sword, and the relevant bones that need to be moved. Key only the bones you need in those animations.

Then in code, you need to play the animations separately on top of each other.
The first parameter of the SetAnimation method determines a Track number.

If you play the running and jumping on track 0;
then the sword swinging on track 1.

You'll get the effect you need.

Any bones keyed by the animations with a higher track number will override bones keyed by animations playing in a lower track number.

// For Running
skeletonAnimation.state.SetAnimation(0, runAnimation, true);

// For Sword swinging
skeletonAnimation.state.SetAnimation(1, swordSwingAnimation, false);

Mix doesn't need to be touched at all for this.

ryanplymire

Oh awesome, thanks! I was thinking that tracks were queued one after another for some reason. I see this is what add and set are for.

Pharan

AddAnimation is for queueing.🙂

The tracks are for playing different animations on top of each other.

Mitch

viewtopic.php?f=7&t=2916

There's also the methods to I used in the above thread, which bypasses the SkeletonAnimation class altogether.

Find the correctbones

      gunShoulderBone = skeleton.FindBone("rear_upper_arm");
      torsoBone = skeleton.FindBone("torso");

do some math and then apply it to the skeleton.

gunShoulderBone.Rotation += neutralTorsoRotation - torsoBone.Rotation;

  skeleton.UpdateWorldTransform();
  skeleton.Update(Time.deltaTime);

To integrate correctly with the SkeletonAnimation class however...

You should subscribe to it's UpdateBones event and do all of your bone override in there.

public delegate void UpdateBonesDelegate(SkeletonAnimation skeleton);
public UpdateBonesDelegate UpdateBones;

Which is called immediately after applying all of the State's information (all of the tracks currently active) to the skeleton.

   public virtual void Update (float deltaTime) {
      if (!valid) return;

  deltaTime *= timeScale;
  skeleton.Update(deltaTime);
  state.Update(deltaTime);
  state.Apply(skeleton);
  if (UpdateBones != null) UpdateBones(this);
  skeleton.UpdateWorldTransform();
   }

Pharan

That's for pointing bones in specific directions, or doing highly logical stuff to them.

OP just wanted to play two animations simultaneously. (despite the title)

Good info though.