Get slots used in particular animation

raeiraei

Hey,

I've got an animated tree with a few animations showing leaves falling when the tree is hit. I'd like to randomize the look of the animations by randomly hiding a few of the leaves.

Trouble is that I can't seem to find any way to identify which slots are used in these animations, in order to only iterate on the slots used for these particular animations and not the rest.

I've tried looping through Skeleton.Slots (yields all slots, including those that should not have random null attachments).

Can you guys help?

Nate

Do you need to inspect the animations to find the slots? It seems easy to have your runtime code know what the slots are.

A between solution might be a naming convention leaf1, leaf2, etc.

If you really want, you can look at the animation's timelines. If you are animating the leaves by transforming bones, then you'll find RotateTimeline/etc. You can get the bone from that, then look through the skeleton's slots to find the slots on that bone (there may be more than 1).

raeiraei

Hey Nate,

Indeed the trouble is naming conventions in supplier files; 3 trees with ₅₅ leaf slots incrementally named 1-55 with no real way to inspect which leaves go in which animations without a lot of time and headache.

Thanks for the tip, will try caching the slots based on the translate!

Hey Nate,

When looping through animation timelines I can only see .Apply method, besides get variables stats on duration/frames.

Can you throw me a tip on how to access modified transform slots from the timeline?

Thanks for your time.

Nate

Sure, if you want to find a RotateTimeline, for example:
https://github.com/EsotericSoftware/spine-runtimes/blob/4.1/spine-csharp/src/Animation.cs#L465

You would loop through Animation timelines, check if timeline instanceof RotateTimeline. If it is, then cast it and get the bone index, eg ((RotateTimeline)timeline).boneIndex. That is the index into SkeletonData bones for the bone being rotated. Now look through SkeletonData slots, get SlotData boneData, and check if BoneData index equals the index from the rotate timeline. If it does, that slot is on the bone being rotated by the timeline.

Pseudo code:

for (Timeline timeline in animation.timelines) {
   if (timeline instanceof RotateTimeline) {
      var rotateTimeline = (RotateTimeline)timeline;
      for (SlotData slotData in skeletonData.slots) {
         if (slotData.boneData.index == rotateTimeline.boneIndex) {
            // slotData is rotated by the timline!
            // Can get the slot for a skeleton like:
            Slot slot = skeleton.slots[slotData.index];
            // And clear its attachment like:
            slot.attachment = null;
         }
      }
   }
}

raeiraei

Hey Nate,

Casting the timeline as type works like a charm. Thanks for the help! 🙂