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SkeletonRootMotion with Mecanim

mathius777

I was following the thread here: viewtopic.php?t=1364

and was trying to get the SkeletonRootMotion to work with Mecanim(using the SkeletonAnimator instead of SkeletonAnimation class). However, SkeletonAnimator doesn't track state, so I am unsure how to proceed. Has anyone done this before? Or perhaps Mitch could give some advice on how to move forward. Thanks.

//this is found in SkeletonRootMotion.cs
void ApplyRootMotion(SkeletonAnimator skelAnim)//changed to take animator
{
    if (rootMotionCurve == null || rootMotionCurveY == null)
        return;

TrackEntry t = skelAnim.state.GetCurrent(0); //ISSUE HERE. the animator doesn't have a state.

Really I just need the rootPosition of the mecanim animator to update based on what animations are playing using the SkeletonAnimator controller. Thanks.

Mitch

In Unity 5 there is a "Generate Root Motion Curve" function built into mecanim clips. I haven't explored it yet, but I feel like the right thing to do would be to extract the root motion by including in the placeholder AnimationClips and using that to feed mecanim directly. No easy task - but probably the right route. I won't be getting around to this anytime soon however 🙁 But theres my thought.

If you want to adapt the rootmotion script from that thread, the best way to do it would be to hook the Update functions and use animator.GetCurrentStateInfo(0) for the same purpose. Mecanim simply works differently than SkeletonAnimation's TrackEntry and AnimationState system.

mathius777

Thanks for the info. I looked through the Animator and AnimationClip classes and don't see any expose to that functionality("Generate Root Motion Curve") so I am having trouble finding how to access this functionality programatically.

But if I understood you correctly, I basically have to create the animation clips proceduraly using the data in the spine animations so I can then generate the root motion controller, since there is no "Generate Root Motion Curve" shown on a clip UNLESS the animation modifies the root bone in some way. So therefor, I was contemplating of generating the animation on import.

Mitch

Yep. Gotta generate the motion. You can take a look at SkeletonBaker, there are even helper functions in there for extracting Spine timelines and turning them into Unity keyframes.

mathius777

Thanks. One final question. If I bake the animation I get all the clips. However if I click an animation clip, there is no option to Generate Root Motion Curve. If I modify the position of the root of the clip(the hip for the spineboy animation for example) for a key frame, then the option appears. This is of course because I am actually modifying the position of the game object.

How would I go about telling your baker to actually modify the position of the game object it belongs to so that when it generates the clip it is actually modifying the world position of the character.