bluebey-studio: ドラッグの役割を入れ替え、回転中心をぶるべーに固定

1 files changed, 20 insertions, 3 deletions

diff --git a/public/bluebey-studio/src/panel.js b/public/bluebey-studio/src/panel.js
index 69c8454..ae45e48 100644
--- a/public/bluebey-studio/src/panel.js
+++ b/public/bluebey-studio/src/panel.js
@@ -298,7 +298,7 @@ export function buildPanel(app, root) {
   }
 
   poseSection.add(hint('ボーンは上の一覧から選びます。スライダーは「休めの姿勢からの差」です。'
-    + 'ビューポートのぶるべーは、ドラッグで移動、Shift＋ドラッグで向きを変えられます。'));
+    + 'ビューポートのぶるべーは、ドラッグでカメラ移動、Shift＋ドラッグでぶるべーを移動できます。どちらも回転の中心はぶるべーです。'));
 
   // こまかい設定: the whole-body nudge and the rotation gizmo are tweaks, not the
   // main way in, so they stay folded away inside the bone section.
@@ -351,8 +351,25 @@ export function buildPanel(app, root) {
       app.animator.reset();
       app.needsRender = true;
     }
-    state.pose = { bones: {}, root: [0, 0, 0] };
-    applyPatch(state.pose, preset.pose ?? {});
+    // Keep where the user put ぶるべー: a pose changes the limbs and may lift the
+    // body off the ground, but it must not move the character back to the origin.
+    // `app.lastPoseRootOffset` remembers how much the previous pose added, so
+    // switching poses does not stack those lifts.
+    const previous = app.lastPoseRootOffset ?? [0, 0, 0];
+    const current = state.pose.root ?? [0, 0, 0];
+    const offset = preset.pose?.root ?? [0, 0, 0];
+    const base = [
+      (current[0] ?? 0) - (previous[0] ?? 0),
+      (current[1] ?? 0) - (previous[1] ?? 0),
+      (current[2] ?? 0) - (previous[2] ?? 0),
+    ];
+    const { root: _ignore, ...poseWithoutRoot } = preset.pose ?? {};
+    state.pose = {
+      bones: {},
+      root: [base[0] + offset[0], base[1] + offset[1], base[2] + offset[2]],
+    };
+    applyPatch(state.pose, poseWithoutRoot);
+    app.lastPoseRootOffset = [...offset];
     if (!state.pose.root) state.pose.root = [0, 0, 0];
     replace({}, 'pose');
     sync();