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How to instantly change the skeleton?

jbstrip

Hello,

Here is my case: I need to change skeleton attachments and makes preview pictures of it. For example, I need to make a picture for all the possible haircuts in a customization menu. To do that, I use a camera which render to a texture and call manually Render() for each haircuts. My problem is that the camera doesn't render the skeleton if it was created during the same Update as the Render call. And if it was created during a previous frame, when I change an attachment during the same Update as Render, the camera stills render the old one. I tried to call UpdateCache and UpdateWorldTransform but it doesn't help. How can I apply instantly a modification to a Skeleton?

Thank you.

Pharan

SkeletonRenderer/SkeletonAnimation's Render method is actually the LateUpdate method (wasn't my decision :x ).
You can call that.

Changes to skeleton are abstract and are done in in animations by Spine.AnimationState in SkeletonAnimation.Update, or by you, whenever.
Then the skeleton (and those changes) are translated into a UnityEngine.Mesh in LateUpdate.

UpdateCache repopulates the list of Updatables (bones, constraints, etc...) in case you changed something.
UpdateWorldTransform calculates world values of bones from their local values.

So it would be.

var skeletonAnimation = GetComponent<SkeletonAnimation>();
var skeleton = skeletonAnimation.skeleton;
//... do whatever
skeletonAnimation.LateUpdate();

jbstrip

Ah ! I forgot to watch in inherited class ! In fact, I have to call Update too before LateUpdate and it works. Thank you Pharan.

Pharan

Ah. But Update reapplies the AnimationState too.
You probably don't need to do that in your case. It may be enough to just say:

// change slots. pose bones. do whatever. then...
skeletonAnimation.skeleton.UpdateWorldTransform();
skeletonAnimation.LateUpdate();

It's not actually necessary to call UpdateWorldTransform unless to changed something about the bones. But it needs to be called at least once before the first render.

jbstrip

Yes, UpdateWorldTransform seems to be enough, thank again for those informations 🙂