From c81104129a9ba6e26aa33a00770f76a6aa97b2a9 Mon Sep 17 00:00:00 2001
From: Yasutake Yohei <61961825+yasutakeyohei@users.noreply.github.com>
Date: Sun, 4 Oct 2026 00:06:06 +0900
Subject: bluebey-studio: 髪の板(hair-plate)で頭の模様を後ろまで回す
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モデルに追加された hair-plate（頭をぐるりと覆う円筒UVの板）を読み込み、頭の模様をその板にも描くようにした。これで横や後ろから見ても髪が見える。髪の板が無いモデルは従来どおり前面の板に描く。
---
 public/bluebey-studio/src/model.js | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'public/bluebey-studio/src/model.js')

diff --git a/public/bluebey-studio/src/model.js b/public/bluebey-studio/src/model.js
index 083c745..68f1255 100644
--- a/public/bluebey-studio/src/model.js
+++ b/public/bluebey-studio/src/model.js
@@ -11,6 +11,7 @@ import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
  *   body parts   Body, Foots, Leaf, Vein, LeftHand, RightHand, Nose
  *   overlays     eyes-* (eight hand-drawn variants, one texture each) and Mouth
  *   face plates  eyes-plate / mouth-plate, the big shells the studio draws on
+ *   hair plate   hair-plate, a shell that wraps right round the head (optional)
  *
  * The two face plates are what the artwork is painted onto. They are the front
  * half of the body, so wherever the drawing lands there is a surface to carry
@@ -60,7 +61,7 @@ const normalizeBoneName = (name) => (name ?? '').replace(/[.\s]/g, '').toLowerCa
  * the ring of leaves around the base, otherwise a low or frowning mouth gets
  * swallowed by them.
  */
-const OVERLAY_INFLATE = { eyes: 0.004, mouth: 0.004 };
+const OVERLAY_INFLATE = { eyes: 0.004, mouth: 0.004, hair: 0.008 };
 
 export async function loadModel(source, { onProgress } = {}) {
   const loader = new GLTFLoader();
@@ -90,6 +91,8 @@ export async function loadModel(source, { onProgress } = {}) {
   /** The big shells the artwork is drawn onto, if the file has them. */
   let eyePlate = null;
   let mouthPlate = null;
+  /** The shell that wraps round the head, so hair shows from behind (optional). */
+  let hairPlate = null;
 
   root.traverse((object) => {
     if (!object.isMesh) return;
@@ -105,6 +108,10 @@ export async function loadModel(source, { onProgress } = {}) {
       mouthPlate = object;
       return;
     }
+    if (materialName === 'hair-plate') {
+      hairPlate = object;
+      return;
+    }
     if (materialName.startsWith('eyes-')) {
       eyes.set(materialName.slice('eyes-'.length), object);
       return;
@@ -125,6 +132,8 @@ export async function loadModel(source, { onProgress } = {}) {
   // The drawing surface: the big plate when present, otherwise the 2022 plane.
   const eyeMesh = eyePlate ?? eyes.get('opened') ?? eyes.values().next().value;
   const mouth = mouthPlate ?? mouthOriginal;
+  // The wrapping hair shell, if the model carries one (`hair-plate`).
+  const hairMesh = hairPlate;
   if (!eyeMesh) throw new Error('eye mesh not found in the GLB');
   if (!mouth) throw new Error('mouth mesh not found in the GLB');
 
@@ -154,6 +163,7 @@ export async function loadModel(source, { onProgress } = {}) {
     .getCenter(new THREE.Vector3());
   inflateOverlay(eyeMesh, headCentre, OVERLAY_INFLATE.eyes);
   inflateOverlay(mouth, headCentre, OVERLAY_INFLATE.mouth);
+  if (hairMesh) inflateOverlay(hairMesh, headCentre, OVERLAY_INFLATE.hair);
 
   // Recentre: put the character on the origin with its feet on the ground so the
   // camera maths stays trivial.
@@ -196,9 +206,10 @@ export async function loadModel(source, { onProgress } = {}) {
       body,
       kinds,
       leaves,
-      overlays: [eyeMesh, mouth],
+      overlays: [eyeMesh, mouth, ...(hairMesh ? [hairMesh] : [])],
       eyeMesh,
       mouthMesh: mouth,
+      hairMesh,
       noseMesh,
       hasFacePlates: Boolean(eyePlate && mouthPlate),
     },
-- 
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