playcanvas / playcanvas/engine
Anim Blend Tree 1D weights issue
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- Dominant language
- JavaScript
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Description
Followup on #6211
Given the path
Level1.Level2.Dance
During the weights calculation loop in Anim Blend Tree 1D, the leaf node (Dance) would take the full weight (1), which would make its parent (Level2) have a zero weight.
On screenshot:
c1 = Dance
c2 = Level2
This sets the parent weight to zero, which breaks the animation.
If the weight is hardcoded to always return 1, then the animation is played correctly:
Repro:
https://playcanvas.com/project/1205544/overview/blend-tree-forked
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked reproduction project and inspect the Anim Blend Tree 1D weights calculation loop described in the issue. Trace the Level1.Level2.Dance path and verify that the parent retains the correct weight so the animation plays correctly without hardcoding the weight.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- game-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100