修复导出问题

src/export/spineJsonExporter.ts

@@ -6,6 +6,7 @@ import { downgradeSpineJsonTo38 } from './spine38JsonExporter'
 import { reduceBezierSamples, reduceNumericSamples, roundSpine, unwrapDegrees, type NumericSample } from './spineKeyframeReducer'
 import { buildWeightedTrailMesh } from './spineMeshBuilder'
 import { loopPlaybackRange, loopSegmentTiming } from '../core/loopSegmentTiming'
+import { collectSubEmitterIds } from '../core/subEmitterIds'
 
 type Track = { key: string; name: string; states: Array<ParticleState | null> }
 type ExportInput = { systems: ParticleSystem[]; timeline: TimelineState; settings: SpineExportSettings }
@@ -327,6 +328,7 @@ export function buildSpineJson(input: ExportInput): SpineExportResult {
   const fps = settings.integerFrameAlignment ? targetFps : sourceFps
   const warnings: SpineExportWarning[] = []
   const visibleSystems = input.systems.filter((system) => system.visible !== false)
+  const subEmitterIds = collectSubEmitterIds(input.systems)
   const document: SpineJsonDocument = {
     // 先生成当前运行时使用的公共结构；3.8 会在最终序列化前降级字段与时间轴格式。
     skeleton: { hash: '', spine: settings.spineVersion, x: 0, y: 0, width: 0, height: 0, images: settings.imagesPath || './images/' },
@@ -339,7 +341,10 @@ export function buildSpineJson(input: ExportInput): SpineExportResult {
   const animationSystems = new Map<string, Array<{ system: ParticleSystem; tracks: Track[]; targetFrames: number; boundaryFrames: Set<number>; attachmentPrefix: string }>>()
 
   for (const system of visibleSystems) {
-    const sourceCount = Math.min(system.frames?.length || 0, particleDurationFrames(system, sourceFps))
+    const frameLength = system.frames?.length || 0
+    const sourceCount = subEmitterIds.has(system.id)
+      ? frameLength
+      : Math.min(frameLength, particleDurationFrames(system, sourceFps))
     const frames = (system.frames || []).slice(0, sourceCount)
     if (!frames.length) warnings.push({ code: 'empty-cache', message: `“${system.config.name}”没有可用帧缓存。` })
     const prefix = uniqueName(safeName(system.config.name, `system_${system.id}`), usedNames)