feat(v0.4b): node-align snap (bbox features -> other nodes)#34
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拖拽 + Ctrl/Cmd 时被拖节点 bbox 特征(中心+8角)吸附到其它节点对应特征(屏幕像素 阈值 12px 内最近对对齐),命中优先否则回退 A 的 grid。snapToNodes 纯函数(收已投影 屏幕点,可单测)+ ThreeViewport mouseDown 缓存目标 + objectChange 节点吸附 + 投影。 Smart Guides/面边特征/旋转缩放吸附延后。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
…ested) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
…lback mouseDown 缓存其它节点 bbox 特征(中心+8角,投影屏幕);objectChange 时被拖节点特征 与缓存目标比,屏幕 12px 内最近对 → obj.position.add(offset),否则回退 grid(A)。 bboxFeatures/toScreen/featureSnapPoints 模块 helper。mouseUp 提交不变(可撤销)。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
… align) 反馈:box 对 box 角能贴,但球放 box 顶面/侧面对齐难(拖很久)——根因 bbox 特征只有 中心+8角,缺面中心。bboxFeatures 加 6 个面中心(±X/±Y/±Z 面),让球底面中心↔box
Two visual-feedback issues from sub-stage B node-align snapping: 1. Depth-blind screen snapping — snapToNodes picked the screen-nearest pair, so from a parallel/side view a far box whose features project close on screen could win over a genuinely nearer box. Screen pixels now only gate "is it close enough to consider"; among in-threshold pairs we pick the one closest in 3D world space. 2. Rotated boxes were hard to snap to their top/face — bboxFeatures used Box3.setFromObject (axis-aligned world AABB), whose face centers don't sit on a rotated box's real faces. Now an oriented box (OBB): compute the bbox in the object's local space, then transform the 15 feature points by matrixWorld so corners/face-centers follow rotation. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
OBB features + world-distance tiebreak; v0.4 stays partial (sub-stage C Socket system pending). Next: 资源拖拽入视口. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jun 8, 2026
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What
v0.4 第二个 sub-stage：gizmo 平移拖拽 + 按住 Ctrl/Cmd 时，被拖节点 bbox 特征（中心+8角）吸附到其它节点的对应特征（屏幕 12px 内最近对对齐），命中优先、否则回退 sub-stage A 的网格吸附。
snapToNodes纯函数（src/core/snap/nodes.ts，收已投影屏幕点，可单测）。ThreeViewport：mouseDown 缓存其它节点 bbox 特征（投影屏幕）；objectChange 节点吸附优先、grid 回退。mouseUp提交不变（可撤销）。Why
How to test
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