Your approach of switching SkeletonDataAsset at runtime is viable and acceptable, but there are some important considerations to ensure it works correctly and efficiently.
Key Points to Consider:
Performance Impact
- The first time you switch to a previously unused SkeletonDataAsset, all necessary data needs to be loaded, which will cause a performance drop during that frame.
- Recommendation: Pre-load the required SkeletonDataAssets during scene loading if possible, rather than loading them on-demand during gameplay. This way, the loading cost happens at a non-critical time.
Initialization Sequence
Your code looks good overall, but make sure you're setting the initialSkinName before calling Initialize(true), especially if different SkeletonDataAssets use different skin names:
// Assign new SkeletonDataAsset
skeletonGraphic.skeletonDataAsset = tempSpineHandle.Result.skeletonDataAsset;
// Set initial skin if needed (important if skins differ between assets)
skeletonGraphic.initialSkinName = "yourSkinName"; // or use the default if appropriate
// Clear animation name to avoid issues with non-existent animations
skeletonGraphic.AnimationName = "";
// Reinitialize
skeletonGraphic.Initialize(true);
Memory Management
- When you replace a SkeletonDataAsset, make sure you properly release the previous one via Addressables to free up memory.
- Your
ReleaseHandle(spineDataHandle) call is good practice for this.
- Note that SkeletonDataAsset itself is not cached by the runtime. If you hold no references to it, the memory should be freed as normal.
Alternative Approaches to Consider:
Object Pooling: Instead of switching SkeletonDataAssets on a single GameObject, consider using a pool of different SkeletonGraphic objects, each with its own SkeletonDataAsset. Enable/disable them as needed. This avoids reinitialization overhead.
Binary Export: If you haven't already, export your skeleton data as .skel.bytes (binary) instead of .json. This significantly reduces loading time and memory allocation.
Runtime Repacking: If memory is the primary concern and you're combining assets that share some textures, consider using runtime skin repacking to consolidate attachments to a single atlas texture.
Your Current Implementation:
Your code structure is solid. The sequence of clearing tracks, clearing the SkeletonGraphic, and then reinitializing is correct. Just ensure you handle skin names appropriately if they differ between your assets.
Conclusion:
Yes, this method is acceptable and supported by Spine-Unity. Just be mindful of the loading performance impact and consider pre-loading assets when possible. Your implementation looks good with the minor addition of handling initialSkinName before Initialize(true).
