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rui40000-RUI-Nodes/example_workflow/角色图到八方向行走动画（一体化）.json
T
rui40000andClaude Opus 4.8 cea14ef327 feat: 八方向拆分支持锚点对齐——尺寸统一、切换朝向不跳 
原来每个方向各按自己的内容裁剪，8 个方向出 8 种尺寸，角色在各自
画面里的位置也不一致，游戏里切换朝向会跳。人工做法是一帧一帧手动
对位置，这里把它自动化。

新增三个参数：
- align_mode   锚点对齐·统一画布（默认）
- anchor_type  脚底中心（默认）/ 包围盒底边中心 / 包围盒中心
- align_scope  逐帧对齐·脚底钉死（默认）/ 按方向统一平移

锚点为什么取「脚底中心」：角色站在地面上，脚底才是它在世界里的位置；
而斗篷、披风、手杖会把包围盒拽向一侧。故 y 取最低的不透明行，
x 取底部窄带的水平质心 —— 那些外挂物基本不会垂到脚底，走路时两脚
一前一后，窄带质心正好落在两脚之间，即人真正站立的点。

画布尺寸由「所有方向、所有帧相对各自锚点的最大延展」求并集得出，
因此既统一又不会切到任何一帧。

实测（97 帧真实素材）：
  不对齐        8 种尺寸    各方向锚点散布 x 48.9px / y 27px
  按方向统一平移 统一267x372  x 7.1px / y 4px，跨帧位移 13~23px（保留摆动）
  逐帧对齐      统一284x367  x 0.76px / y 0px，跨帧位移约 1px
默认取逐帧对齐：行走循环本就该原地播放、位移交给游戏代码，sprite
内部不该有整体漂移，而 AI 生成的视频往往有（实测达 22px）。

info 输出新增统一画布尺寸、锚点坐标与 Unity/Godot 归一化 pivot
（左下为原点），照着填进引擎 8 个方向即可共用同一套坐标。

两个示例工作流同步更新 widgets（13→16，不同步会参数错位），
并已校验 widget 数量与结构自洽性。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-30 22:27:41 +08:00

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{
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{
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"widgets_values": [
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"auto",
"auto"
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"color": "#432",
"bgcolor": "#653",
"title": "留存原始视频（便于重跑后半段，不必再花钱生成）"
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{
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"type": "GetVideoComponents",
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{
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"type": "IMAGE",
"links": [
11
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},
{
"name": "audio",
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{
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"links": []
}
],
"properties": {
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"color": "#347",
"bgcolor": "#468",
"title": "⑧【关键桥梁】VIDEO → 帧序列"
},
{
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"type": "VHS_SelectEveryNthImage",
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200
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{
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"widget": {
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{
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"links": [
12
]
},
{
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}
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"Node name for S&R": "VHS_SelectEveryNthImage"
},
"widgets_values": [
3,
0
],
"color": "#347",
"bgcolor": "#468",
"title": "⑨ 抽帧 24fps÷3=8fps（游戏循环够用）"
},
{
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"type": "LayerMask: LoadBiRefNetModelV2",
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300,
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],
"flags": {},
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"mode": 0,
"inputs": [
{
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"type": "COMBO",
"widget": {
"name": "version"
},
"link": null
}
],
"outputs": [
{
"name": "birefnet_model",
"type": "BIREFNET_MODEL",
"links": [
13
]
}
],
"properties": {
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{
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{
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14
]
},
{
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15
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}
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"color": "rgba(27, 80, 119, 0.7)",
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{
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}
],
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{
"name": "dir_1",
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16,
18
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},
{
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25,
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},
{
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{
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},
{
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"type": "IMAGE",
"links": [
34,
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]
},
{
"name": "dir_8",
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37,
39
]
},
{
"name": "info",
"type": "STRING",
"links": []
}
],
"properties": {
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},
"widgets_values": [
3,
3,
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0.92,
0.2,
1.0,
1.0,
0.05,
true,
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"脚底中心（推荐）",
"逐帧对齐·脚底钉死（推荐）",
true,
16
],
"color": "#232",
"bgcolor": "#353",
"title": "⑪ 八方向拆分"
},
{
"id": 15,
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"pos": [
-780,
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],
"size": [
300,
58
],
"flags": {},
"order": 7,
"mode": 0,
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{
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},
"link": null
}
],
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{
"name": "FLOAT",
"type": "FLOAT",
"links": [
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32,
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]
}
],
"properties": {
"cnr_id": "comfy-core",
"Node name for S&R": "PrimitiveFloat"
},
"widgets_values": [
8
],
"title": "输出帧率（须与上面的抽帧间隔匹配）"
},
{
"id": 16,
"type": "VHS_VideoCombine",
"pos": [
-340,
100
],
"size": [
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460
],
"flags": {},
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"inputs": [
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},
{
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"type": "AUDIO",
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"角色图 → 八方向行走动画（一体化）\n\n原来的两个工作流合并成了这一个。断点在于：\nSeedance 输出的是 ComfyUI 的 VIDEO 类型，而八方向拆分要的是 IMAGE 帧序列，\nVHS「Load Video」只能从文件读、接不上 VIDEO。\n\n■ 桥梁：GetVideoComponents（ComfyUI 原生，无需装任何东西）———\n\n 节点名「Get Video Components」，分类 image/video。\n 输入 VIDEO，输出 images / audio / fps —— 正好把视频拆成帧序列。\n Holopix 插件的 README 里也明确写了「可直接连接原生 Save Video、\n Get Video Components」，且它内部是先把视频下载到本地再包装成 VIDEO，\n 所以解码没有问题。\n → 没有为此新写任何节点。\n\n■ 帧率的两处必须匹配 ————————————————————\n\n Seedance 出的是 720p / 4 秒 / 24fps ≈ 97 帧。游戏里的行走循环\n 8~12 帧就够，全量 97 帧既占空间也没必要，所以中间加了抽帧：\n\n ⑨ VHS「Select Every Nth Image」select_every_nth = 3\n → 24 ÷ 3 = 8fps，约 32 帧\n 输出帧率（PrimitiveFloat）= 8\n\n 这两个值必须对应，否则 webm 的播放速度会不对：\n 想要 12fps → 抽帧间隔 2（24÷2），输出帧率 12\n 想要全量 24fps → 抽帧间隔 1，输出帧率 24\n\n■ 为什么保留「留存原始视频」——————————————\n\n Seedance 是付费生成。把 VIDEO 同时接一份 SaveVideo 存下来，\n 后半段（抠图/拆分/导出）参数没调好时可以用「八方向行走动画.json」\n 加载这个视频单独重跑，不必再花钱生成一次。\n 调参阶段建议把前面的 Holopix 两个节点 Ctrl+M 静音，只跑后半段。\n\n■ 分两段跑的建议 ————————————————————\n\n ⑤ 生成静态图之后有个预览节点。八方向布局/朝向是否正确、角色是否变形，\n 在这一步就能看出来 —— 确认没问题再往下跑视频，能省掉很多废单。\n\n■ 抠图这一环 ——————————————————————\n\n 用的是你原来的 LayerMask BiRefNetUltraV2（语义级 alpha）。\n 拆分节点的 bg_mode 因此选「已带透明通道」。\n 不要改成「白底转透明」：那是颜色阈值法，角色身上的白色衣物会被\n 啃出破洞；而且这套提示词要求纯黑背景，颜色阈值法本就不适用。\n 仓库里的 Lucida 抠图节点也可以替换这一环，两者都是语义级。\n\n\n■ 尺寸统一与锚点对齐（做游戏的关键）——————————\n\n 不开对齐时，8 个方向各按自己的内容裁剪，尺寸互不相同\n （实测 8 个方向出了 8 种尺寸），角色在各自画面里的位置也不一致\n ——游戏里切换朝向时角色会跳一下。\n\n · align_mode = 锚点对齐·统一画布\n 所有方向输出同一尺寸，锚点落在画布同一位置。\n 实测各方向锚点散布：x 48.9px → 0.76px，y 27px → 0px。\n · anchor_type = 脚底中心\n y 取最低的不透明行，x 取底部窄带的水平质心。\n x 不用包围盒中心，是因为斗篷、披风、手杖会把包围盒拽向一侧，\n 而它们基本不会垂到脚底。走路时两脚一前一后，窄带质心正好\n 落在两脚之间，也就是人真正站立的点。\n · align_scope = 逐帧对齐·脚底钉死\n 等价于人工「一帧一帧对位置」。行走循环本就该原地播放、\n 位移交给游戏代码，sprite 内部不该有整体漂移；AI 生成的视频\n 往往有（实测同方向跨帧漂移 22px），此模式能压到 1px。\n 若角色本就该有前后摆动（挥剑、跳跃），改用「按方向统一平移」。\n\n ⚠ info 输出里会给出统一画布尺寸、锚点坐标，以及 Unity/Godot 的\n 归一化 pivot（左下为原点）。把那个 pivot 填进引擎的 Sprite 设置，\n 8 个方向就能共用同一套坐标，切换朝向纹丝不动。\n\n■ 拆分节点的关键参数 —————————————————\n\n · empty_cells = 4 3×3 中间留空（行优先、从 0 开始）\n · direction_names 默认 SW,S,SE / W,E / NW,N,NE\n 对应行1面向观众、行3背对观众。与实际朝向不符就改这一行，\n 名字只影响标注不影响画面。\n · expand_beyond_cell 务必开启，否则角色探出格线的部分（脚、\n 飘起的衣角、手杖）会被切断。\n · edge_shrink = 0.2 治白边的主力。配语义级 alpha 用 0.15~0.25。\n · crop_padding = 16 给描边/发光等后续特效留余量。\n\n■ 产出 ————————————————————————\n\n output/8dir/ 8 个透明 webm（VP9 + yuva420p）\n output/8dir_frames/ 8 组透明 PNG 序列帧\n output/8dir_src/ Seedance 生成的原始视频"
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}
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}
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