Timeline API: world position for bone at specific keyframe

schnauzerfan

Background: I'm doing some run-time post-processing of animations to align bone position and rotation at certain keyframes to non-spine game objects - e.g. setting the transform of a hand bone at the last keyframe of an animation to convincingly align to a prop > attach bone follower to the prop (character has picked up the prop) > run another animation with the prop in the character's hand.....

However, I can't seem to find an answer anywhere for this in docs or forum:

Is there a method in the Timeline API to get a child bone's world transform/rotation (or any other timeline in the animation) at a specific keyframe?

I started writing my own simple parser for SkeletonData JSON to iterate through the bone hierarchy, adding up rotations for child bones at specific keyframes, but I just wanted to make sure that this is not a solved problem before continuing.

Nate

The easy way is to apply the animation at the time you want (with either Animation or AnimationState), call Skeleton updateWorldTransform, and then take the bone transform and any other values you want. This isn't slow.

You don't want to try to calculate the values yourself. You would end up duplicating almost everything in the runtime (Skeleton, Animation, constraints, etc) to do it properly.

schnauzerfan

Thanks - I knew there had to be a simple solution 🙂