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<h1 id="cutout">Cutout</h1>
<p>Cutout 在静态 Image Empty 上圈定 Selection,按轮廓创建 Flat、Solid、Depth Symmetry 或 Depth Solid。入口位于 <code>operators/cutout_tool/operators.py</code>,Shape 菜单位于 <code>interaction.py</code>,预设标识与节点组对应关系位于 <code>shape.py</code>。</p>
<pre class="mermaid"><code>flowchart TD
A[Lasso 或 Polyline 提交 SelectionPath] --&gt; B[选择 Shape]
B --&gt; C[栅格化 SelectionMask 并读取源 RGBA]
C --&gt; D{需要 Depth 或 Normal?}
D -- 是 --&gt; E[准备 bounds 矩形 RGBA]
E --&gt; F[generate-cutout-artifacts]
F --&gt; G[加载 Depth、Metadata 与 Normal]
D -- 否 --&gt; H[源 Alpha 与 SelectionMask 组合]
G --&gt; H
H --&gt; I[边界映射、轮廓提取与质量三角化]
I --&gt; J[BaseShape 与 o_balloon]
J --&gt; K[创建材质、对象与对应节点修改器]</code></pre>
<table>
<thead>
<tr>
<th>预设</th>
<th>节点组</th>
<th>AI 产物</th>
</tr>
</thead>
<tbody>
<tr>
<td>Flat</td>
<td><code>O Image Cutout</code>,Thickness 0</td>
<td>可选切线空间法线</td>
</tr>
<tr>
<td>Solid</td>
<td><code>O Image Cutout</code>,Thickness 1</td>
<td>可选切线空间法线</td>
</tr>
<tr>
<td>Depth Symmetry</td>
<td><code>O Image Depth Cutout</code> 与 <code>O Image Cutout Symmetry</code></td>
<td>深度与对象空间法线</td>
</tr>
<tr>
<td>Depth Solid</td>
<td><code>O Image Depth Cutout</code></td>
<td>深度与对象空间法线</td>
</tr>
</tbody>
</table>
<p>Flat 与 Solid 可以不带 AI 产物生成;Depth 预设和 Normal Map 需要就绪的几何模型,Shape 菜单按该状态提供选项。</p>
<h2 id="_1">轮廓与网格</h2>
<p><code>geometry.py</code> 从内容 Alpha 提取连通轮廓与孔洞,按 Edge Length 生成 <code>BaseShape</code>。Edge Length 是世界空间的网格目标边长,Minimum Relative Edge Length 会按内容范围提高其下界。</p>
<p><code>mesh.py</code> 负责轮廓分离、孔洞处理、质量三角化和边界支撑,<code>polygon.py</code> 提供轮廓简化,<code>tangle.py</code> 是随包分发的 Delaunay 三角化核心。Fine Outline 展开时保留小孔与细节轮廓,关闭时填洞并简化。</p>
<p><code>balloon.py</code> 负责 Balloon Profile,按 Preferences 选择 Poisson 或 Teddy,生成所有预设共用的 POINT 属性 <code>o_balloon</code>。<code>boundary_padding.py</code> 按 Boundary Padding 沿结构内法线重采样轮廓附近的颜色与深度。</p>
<h2 id="ai">AI 与对象创建</h2>
<p>Server 接收 Selection bounds 内保留源 Alpha 的 RGBA,一次 MoGe 推理按 <code>generate_depth</code> 与 <code>normal_mode</code> 返回产物。深度参考区域使用所选 Alpha Threshold,Normal 使用原预测;Maximum AI Input Size 只影响分析分辨率。</p>
<p><code>object.py</code> 的 <code>create_shape_object()</code> 消费 BaseShape、Color、Depth 和 Normal,加载对应节点组。基础网格位于局部 XZ 平面,厚度沿 Y 展开;对象矩阵把网格放入 Image Empty 的图片平面,Depth Symmetry 额外叠加对称节点组与方向参数。Object Normal 随方向同步转换。</p>
<p>材质使用 IOR 1.2,颜色与法线接入 Image Layer,法线按切线或对象空间解释。节点计算见<a href="../../node-assets/">节点资产</a>。</p>
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