auto-save 2026-05-14 13:43 (~4)

web/app/page.tsx

@@ -51,6 +51,29 @@ const FRAME_QUALITY_LABELS: Record<FrameExtractQuality, string> = {
   ultra: "极准",
 }
 
+const PRODUCT_FUSION_WEARING_PROMPT = [
+  "Product placement must be physically correct:",
+  "The SKG device is a rigid opaque white U-shaped neck massager, not a soft scarf, necklace, cable, collar, sticker, implant, or transparent body part.",
+  "It must stay OUTSIDE the transparent skin shell. It should rest on the external surface around the back of the neck and upper shoulders, like a wearable collar-shaped device.",
+  "The curved bridge sits behind the neck. The two open arms come forward along the left and right sides of the neck, above the collarbones and near the upper trapezius.",
+  "The inner metal massage pads face the back/side of the neck. The outer glossy plastic shell remains visible and opaque.",
+  "Hands may hold the two ends while putting it on, then release or lightly press the side control button. Hands must not hide the device silhouette.",
+  "The product should occlude the transparent skin where it is in front, cast a small contact shadow, and keep realistic perspective and scale.",
+  "Keep a tiny readable separation between product edge and skeleton/skin whenever needed so it never looks embedded.",
+].join("\n")
+
+const PRODUCT_FUSION_PRODUCT_IDENTITY_PROMPT = [
+  "Product identity is strict:",
+  "The four SKG product reference images are the single source of truth for the object. Preserve the same white U-shaped body, rounded arms, inner massage pads/nodes, side buttons, seams, glossy plastic material, thickness, proportions, and viewing angles.",
+  "Do not redesign, stylize, simplify, melt, inflate, shrink, recolor, add logos/text/screens/wires/extra parts, or turn it into a generic neckband/headphone/medical brace.",
+  "If the product and character conflict, prioritize preserving the product shape and place it externally on the neck rather than merging it into the character.",
+].join("\n")
+
+const PRODUCT_FUSION_NEGATIVE_PROMPT = [
+  "Hard negatives for product fusion:",
+  "no product passing through the neck, no product inside the transparent body, no x-ray blending, no transparent product, no product becoming bones or skin, no product fused with spine/ribs/throat, no clipping through shoulders, no floating device, no melted device, no deformed U-shape, no wrong body part, no necklace/scarf/headphones/brace, no random replacement product.",
+].join("\n")
+
 // 合并 input + download + split 为一个节点
 // 分叉：上路 input → visual lab ↘
 //       下路 input → audio ──────────────────────────→ compose
@@ -540,16 +563,16 @@ export default function Home() {
         `产品角度图 2：${labelOf(productRefs[1], "SKG 产品侧面/斜侧视角")}。`,
         `产品角度图 3：${labelOf(productRefs[2], "SKG 产品背面/细节视角")}。`,
         `产品角度图 4：${labelOf(productRefs[3], "SKG 产品补充/底部或佩戴视角")}。`,
-        "产品使用部位：这是颈部/肩颈按摩仪，只能自然佩戴或贴合在脖子、后颈、颈肩交界处；不要放到手臂、腰、腿、胸口、眼部或背景里。",
-        "比例尺寸：产品应符合真实颈部按摩仪大小，U 形结构环绕后颈但不能巨大化、缩小成饰品、嵌入身体、悬浮或穿透透明人体。",
-        "镜头语言：严格按描述里的出场方式、场景、景别、运镜、产品进入方式、佩戴贴合动作、使用过程和收尾方式执行。",
+        PRODUCT_FUSION_PRODUCT_IDENTITY_PROMPT,
+        PRODUCT_FUSION_WEARING_PROMPT,
+        "Camera direction: follow the scene description, but always stage the product as a separate external wearable object. Show the hands placing or adjusting the device on the outside of the neck; do not imply the product is merged with the transparent body.",
         `场景/使用/享受描述：${shot.action_text.trim()}`,
         TRANSPARENT_HUMAN_VIDEO_PROMPT,
-        "融合要求：产品必须自然出现在透明骨架人动作中，尺寸可信，透视一致，只贴合手部拿取和后颈/颈肩使用区域，不能悬浮、漂移、融化、扭曲或变成其他物体。",
+        "Fusion rule: this is product placement, not body fusion. The product is an opaque physical device worn outside the body with believable contact shadow, occlusion, scale, and perspective.",
         "连续性：镜头必须完整连贯，中间不要跳切，不换角色，不换产品，不突然改变场景。",
-        "产品一致性：严格保持 SKG 产品外观、颜色、材质、U 形结构、按摩触点、按键和比例；四张产品角度图是产品身份真源。",
         "场景要求：背景、空间、光线和阴影要自然统一，不要出现水印、平台 UI、字幕或竞品包装。",
         "商业质感：真实拍摄感、干净高级、产品清楚可辨、人物动作自然、镜头稳定。",
+        PRODUCT_FUSION_NEGATIVE_PROMPT,
         "禁止：文字、水印、随机品牌、非 SKG 产品、医学治疗承诺、夸张病症、恐怖元素、产品位置漂移、透明衣服但非透明身体。",
         TRANSPARENT_HUMAN_NEGATIVE_PROMPT,
       ].join("\n")
@@ -559,7 +582,7 @@ export default function Home() {
         first_image: null,
         last_image: null,
         product_images: productRefs,
-        subject_image: primarySubject,
+        subject_image: null,
         subject_images: subjectRefs,
         scene_image: null,
         product_image: productRefs[0] ?? null,