fix: Live2D motion eye blink composition - #124
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. Walkthrough新增 Live2D 眼睛动作合成模块。模块在动作和表情同时更新时合成左右眼开合值。场景运动流程接入该模块，并新增集成测试和 npm 执行脚本。 ChangesLive2D 眼睛动作合成
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The PR changes how facial and motion eye states are composed to restore motion-driven blinking, with the supplied validation indicating the intended behavior. It is otherwise mergeable, but the new TypeScript file should be renamed or explicitly exempted to satisfy repository conventions. Sequence Diagram(s)sequenceDiagram
participant Scene
participant MotionManager
participant EyeMotionCompositor
participant FacialManager
participant Live2DCoreModel
Scene->>EyeMotionCompositor: 创建合成会话
MotionManager->>EyeMotionCompositor: 更新动作
EyeMotionCompositor->>FacialManager: 恢复表情眼睛值
EyeMotionCompositor->>MotionManager: 以中性眼睛值执行动作
MotionManager->>Live2DCoreModel: 写入动作眼睛值
FacialManager->>Live2DCoreModel: 写入表情眼睛值
EyeMotionCompositor->>Live2DCoreModel: 写入乘积合成值
Scene->>EyeMotionCompositor: 清理合成会话
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@scripts/test-live2d-eye-motion.mjs`:
- Around line 95-98: 在脚本顶部从 node:url 导入 URL，使 test-live2d-eye-motion.mjs 中创建
fixtureUrl 的代码通过 ESLint 的 no-undef 检查。
In `@src/story/composeLive2DEyeMotion.ts`:
- Around line 33-37: Rename the composeLive2DEyeMotion module file to PascalCase
as ComposeLive2DEyeMotion.ts, and update the corresponding import in scene.ts to
use the new filename while preserving the existing composeLive2DEyeMotion export
and behavior.
- Line 1: 添加显式类型标注：在 src/story/composeLive2DEyeMotion.ts 的 1-1 为
EYE_OPEN_PARAMETER_IDS 指定只读元组类型，在 67-67 为 nextToken 指定 number 类型；在
src/story/scene.ts 的 82-117 为新增的三个参数列表分别指定合适的只读数组或元组类型。
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📒 Files selected for processing (4)
package.jsonscripts/test-live2d-eye-motion.mjssrc/story/composeLive2DEyeMotion.tssrc/story/scene.ts
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RoiexLee
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Summary
Live2D body motions can contain eye-open curves used for blinking. These curves are currently ignored when a facial motion is active because allowing both motion managers to write
ParamEyeLOpenandParamEyeROpendirectly can interfere with the facial motion.This PR restores motion-driven blinking while preserving the facial eye state.
Problem
The body motion and facial motion are evaluated by separate motion managers.
Simply allowing both managers to update the eye-open parameters causes them to overwrite or blend from each other's values. For example, with:
w-adult-think01face_closeeye_01The facial motion may fail to close the eyes completely because the body motion continues writing its own eye-open values.
Disabling the body motion's eye parameters avoids that conflict, but also disables the blink authored into the motion.
Solution
This PR evaluates the two eye layers independently and composes them as:
The motion eye curve is treated as a blink factor evaluated from a neutral value of
1, while the facial eye state is preserved independently.This means:
Other facial parameters continue to be controlled by the facial motion as before.
Video comparison
Both videos use the same combination:
w-adult-think01face_closeeye_01The “before” build enables the motion eye parameters without applying the composition introduced by this PR. It demonstrates the conflict that originally led to the eye parameters being disabled.
Before — eye motion enabled without composition
face_closeeye_01does not fully close the eyes because the body motion and facial motion interfere with each other.2026-08-22.190636.mp4
After — with this PR
face_closeeye_01closes the eyes completely while the body motion continues playing.2026-08-22.190825.mp4
Validation
pnpm test:live2d-eye-motionpnpm typecheckw-adult-think01 + face_closeeye_01before and after the fix.w-adult-think01 + face_smile_01retains the facial expression while allowing the motion blink to play.The added regression test verifies that:
w-adult-think01fixture contains the expected eye-open blink curves.Summary by CodeRabbit