导出修正

src/export/spineJsonExporter.ts

@@ -71,6 +71,15 @@ function collectTracks(frames: ParticleState[][], bonePool: boolean, usedNames:
   }))
 }
 
+/**
+ * 轨道在时间轴上真正使用到的图片资源(骨骼池模式下同一轨道先后出生多颗粒子，可能用到多张)。
+ * 只有用到的图片才会挂到该轨道的插槽下，避免没用到的附件也占位。
+ */
+function trackImageResources(system: ParticleSystem, track: Track) {
+  const usedIds = new Set(track.states.map((state) => state?.resourceId).filter((id): id is number => typeof id === 'number'))
+  return system.config.imageResources.filter((resource) => usedIds.has(resource.id))
+}
+
 function sourceStateAt(track: Track, targetFrame: number, sourceFps: number, targetFps: number) {
   const source = targetFrame * sourceFps / targetFps
   const aIndex = Math.min(track.states.length - 1, Math.max(0, Math.floor(source)))
@@ -273,12 +282,14 @@ export function buildSpineJson(input: ExportInput): SpineExportResult {
 
     for (const track of tracks) {
       document.bones.push({ name: track.name, parent: prefix })
-      const usedImageBlends = new Set(system.config.imageResources.map((item) => item.blend))
+      const imageResources = trackImageResources(system, track)
+      const usedImageBlends = new Set(imageResources.map((item) => item.blend))
       for (const blend of usedImageBlends) {
         const slotName = `${track.name}_image_${blend}`
         document.slots.push({ name: slotName, bone: track.name, color: 'ffffff00', blend: BLENDS[blend] })
         const slotSkin = skin[slotName] ||= {}
-        for (const resource of system.config.imageResources.filter((item) => item.blend === blend)) {
+        // 只挂该轨道真正用到的图片；序列帧资源包含全部帧(每帧都会被播放到)。
+        for (const resource of imageResources.filter((item) => item.blend === blend)) {
           const count = resource.imageMode === 'sequence' ? Math.max(1, resource.sequenceFrames.length) : 1
           for (let frame = 0; frame < count; frame++) slotSkin[`image_${resource.id}_${frame}`] = resourceAttachment(resource, frame, warnings)
         }
@@ -342,7 +353,8 @@ export function buildSpineJson(input: ExportInput): SpineExportResult {
         if (scale.length) boneTimeline.scale = scale
         if (Object.keys(boneTimeline).length) { animation.bones[track.name] = boneTimeline; hasContent = true }
 
-        const usedBlends = new Set(system.config.imageResources.map((item) => item.blend))
+        const imageResources = trackImageResources(system, track)
+        const usedBlends = new Set(imageResources.map((item) => item.blend))
         for (const blend of usedBlends) {
           const attachments: Array<string | null> = [], colors: number[][] = []
           let lastColor = 0xffffff
@@ -354,7 +366,7 @@ export function buildSpineJson(input: ExportInput): SpineExportResult {
             attachments.push(visible ? `image_${resource!.id}_${state!.imageFrameIndex ?? 0}` : null)
             colors.push(rgbaValues(lastColor, visible ? state!.alpha : 0))
           }
-          const blendResources = system.config.imageResources.filter((item) => item.blend === blend)
+          const blendResources = imageResources.filter((item) => item.blend === blend)
           const requestedModes = blendResources
             .filter((item) => item.independentAlpha === 'curve')
             .map((item) => resolvedTimelineCurve(item.alphaCurveMode, settings))