tailor(voyager): strapless bandeau lane -- elastic-free zero-g recipe + 23-variant work log

Female voyager bandeau top from the fc-voyager-kilt-gpt refs. Winning construction (md_final_v16/v23): seamless-loop doctrine -- NO edge elastic (gathering is what notched the armpit junctions), body-snug cut, zero-g wrap (SetSimulationGravity(0) BEFORE ResetClothArrangement -- one full-gravity materialization tick drops the bistable tube into the low basin), stiff 40f positioning then soft 110f conform, self-measuring retry loop. Hard-won facts logged in the scripts: strapless garments never survive full gravity (frictionless skin + stretchy elastic); arrangement x IS azimuth (Body_Back_Center_1 native x=0, forcing 50/50 sews both panels into a front pouch); SetArrangementOrientation flips panel facing but mirrors it L/R; frozen cloth renders cyan; back panel textured face points at the skin -- fix is manual Flip Normal (no API). Texture: positioned plait/rope/fringe tile spanning the 170mm panel once (hem anchors at v=0.5 and wraps). manual_fit_backup.zprj preserves Can's hand-fitted drape. Exports still pending final drape approval. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-18 22:46:31 +03:00
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+{
+  "name": "voyager_bandeau_v1",
+  "_worksheet": {
+    "block": "custom strapless band (fitted_top numbers, no straps)",
+    "reference": "docs/conceptart/generated-images/female-clothing/fc-voyager-kilt-gpt-piece-top*.png",
+    "placement": {"band_top_z": 1.31, "hem_z": 1.14, "tol_m": 0.03},
+    "body_circ_mm": {"bust_max": 1083.4, "at_top_1.31": 917.4, "at_hem_1.14": 794.4},
+    "ease_mm": 17,
+    "panel": "hexagon: bust-width waist at y=123.6, tapered to snug top and hem",
+    "hold_mechanism": "top edge cut 467 vs 550 needed to clear the bust; elastic cinch mid-settle (strength 60 -- default never reaches target)",
+    "lines": {"top": 0, "side_r_up": 1, "side_r_low": 2, "hem": 3, "side_l_low": 4, "side_l_up": 5},
+    "strapless_rationale": "reference has no straps; skill says straps-beat-tubes, but a tube can only slide down by stretching its 467mm top edge over the 550mm bust -- geometry blocks it. If QC shows it slid to the underbust anyway, v2 adds straps."
+  },
+  "md": {
+    "reset": "new_project",
+    "avatar_fbx": "C:/Users/CAN/tinqs-ltd/animation/tools/tailor/avatar/Lena_QuatSkin_Avatar.fbx",
+    "avatar_scale": 10.0,
+    "add_arrangement_points": true,
+    "auto_translate": true,
+    "zfab": "C:/Users/Public/Documents/MarvelousDesigner/New Assets/Fabric/(Default for Simulation).zfab",
+    "texture": "C:/Users/CAN/tinqs-ltd/animation/tools/tailor/textures/voyager_bandeau.png",
+    "panels": [
+      {"name": "front", "dx": 0.0,
+       "note": "strapless band: W 550.2 at bust (circ 1083.4 + ease 17), top 467.2, hem 405.7, H 170",
+       "points": [[41.5, 170.0], [508.7, 170.0], [550.2, 123.6], [478.0, 0.0], [72.2, 0.0], [0.0, 123.6]]},
+      {"name": "back", "dx": 800.2,
+       "note": "identical panel; lines 0 top | 1 sideR-up | 2 sideR-low | 3 hem | 4 sideL-low | 5 sideL-up",
+       "points": [[41.5, 170.0], [508.7, 170.0], [550.2, 123.6], [478.0, 0.0], [72.2, 0.0], [0.0, 123.6]]}
+    ],
+    "seams": [
+      {"a": "front", "a_line": 1, "b": "back", "b_line": 1, "reverse_a": true, "reverse_b": true},
+      {"a": "front", "a_line": 2, "b": "back", "b_line": 2, "reverse_a": true, "reverse_b": true},
+      {"a": "front", "a_line": 4, "b": "back", "b_line": 4, "reverse_a": true, "reverse_b": true},
+      {"a": "front", "a_line": 5, "b": "back", "b_line": 5, "reverse_a": true, "reverse_b": true}
+    ],
+    "arrangements": [
+      {"panel": "front", "point": "Body_Front_Center_1", "offset": [50, 55, 50]},
+      {"panel": "back", "point": "Body_Back_Center_1", "offset": [50, 55, 50]}
+    ],
+    "sim": {
+      "strengthen": true,
+      "settle_frames": 250,
+      "elastic": [
+        {"panel": "front", "line": 0, "total_length": 450.0, "strength": 60},
+        {"panel": "back", "line": 0, "total_length": 450.0, "strength": 60},
+        {"panel": "front", "line": 3, "total_length": 390.0, "strength": 60},
+        {"panel": "back", "line": 3, "total_length": 390.0, "strength": 60}
+      ],
+      "elastic_frames": 80,
+      "relax_frames": 50
+    },
+    "cam_viewpoint": 2,
+    "presim_snapshot": "C:/Users/CAN/AppData/Local/Temp/claude/C--Users-CAN-tinqs-ltd-docs/3744fd8e-1342-446c-9677-7aafbafc8d18/scratchpad/voyager_bandeau_presim.png",
+    "snapshot": "C:/Users/CAN/AppData/Local/Temp/claude/C--Users-CAN-tinqs-ltd-docs/3744fd8e-1342-446c-9677-7aafbafc8d18/scratchpad/voyager_bandeau_front.png",
+    "back_snapshot": "C:/Users/CAN/AppData/Local/Temp/claude/C--Users-CAN-tinqs-ltd-docs/3744fd8e-1342-446c-9677-7aafbafc8d18/scratchpad/voyager_bandeau_back.png",
+    "export_dir": "C:/Users/CAN/tinqs-ltd/animation/tools/tailor",
+    "export_basename": "lena_voyager_bandeau_v1",
+    "exports": []
+  },
+  "expect": {
+    "bands": {
+      "voyager_bandeau_v1": {"top_m": 1.31, "bottom_m": 1.14, "tol_m": 0.03, "from": "cover"}
+    }
+  }
+}