Optimize Cutout Geometry Nodes

- Refactor Depth Cutout to reuse the projected outline field, reducing redundant boundary calculations and improving performance.
- Derive the center field from shared low-frequency fields, eliminating an unnecessary blur operation.
- Implement triangle-only strip cleanup for Depth Cutout, as the input is confirmed to be triangulated.
- Short-circuit zero-thickness branches in both Cutout and Depth Cutout to avoid unnecessary geometry generation.
- Standardize internal attribute naming with a new `_o_` prefix and implement wildcard cleanup for temporary attributes.
- Update relevant tests to ensure functionality remains consistent and validate changes against existing behavior.

openspec/changes/optimize-cutout-geometry-nodes/.openspec.yaml

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+schema: spec-driven
+created: 2026-09-15

openspec/changes/optimize-cutout-geometry-nodes/design.md

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+## Context
+
+`O Image Cutout` 负责普通 Surface/Balloon，`O Image Depth Cutout` 负责深度投影后的 Balloon/Shell。二者共同消费 Cutout 基础网格和 `o_balloon`，并在输出后进入材质与法线阶段。
+
+当前 Depth Cutout 从源码构建会生成约 441 个节点、587 条连线，其中包含 13 个 Blur Attribute、12 个 Sample Index，以及多处针对同一拓扑重复计算的边界字段。Depth Cutout 输入已确认为三角网格，因此 `_remove_strip_faces` 中的四边面清理分支是无效构建路径。普通 Cutout 和 Depth Cutout 在零厚度时仍会先生成厚度几何，再由 `_remove_zero_thickness` 选择原表面。
+
+临时属性目前使用 `.o_anyimage_depth_cut`，通过 `remove_attributes` 按具体名称条件删除；测试和资产检查仍保留 `.o_anyimage_original_boundary` 的旧名称。公开协议属性 `o_balloon`、`o_normal_reduction` 等需要继续保留。
+
+## Goals / Non-Goals
+
+**Goals:**
+
+- 在保持两个节点组公开输入、输出几何和视觉结果不变的前提下，减少 Depth Cutout 的重复节点与求值。
+- 按拓扑阶段复用 projection 后的 outline 边界字段。
+- 用共享的低频场推导中心场，减少一次 256 次邻域平滑。
+- Depth Cutout 仅构建三角形 strip 清理路径。
+- 厚度为零时提前返回单层表面，避免先生成壳体。
+- 将内部临时属性统一改为 `_o_` 前缀，公开保留属性保持 `o_` 前缀，并用 Wildcard 一次性清理内部属性。
+
+**Non-Goals:**
+
+- 不改变 Balloon 的背面算法、平滑次数、圆润公式或法线方向。
+- 不改变 Cutout 的 Operator、Job、材质协议或公开属性语义。
+- 不重排节点布局；布局优化只在必要的最小范围内跟随代码路径调整。
+- 不构建文档或打包扩展。
+
+## Decisions
+
+### 1. 投影后只计算一次 outline 字段
+
+`_build_depth_surface` 在 `remove_boundary_triangles` 之后、`project_depth_surface` 之前已经计算 outline。投影只改变位置，不改变拓扑，因此同一个 POINT/BOOLEAN 字段在投影后仍然有效。
+
+将该字段作为参数传给 `build_volume_fields`、`original_boundary_field` 和 `smooth_cut_boundary`，由这些函数复用，而不是各自重新创建 `edge_boundary_field`。
+
+备选方案是继续保留局部字段，可读性更高但会重复创建多组 Edge Neighbors、Vertex Neighbors 和域转换。本变更选择显式传递，因为高密度网格下这些重复查询是可见成本。
+
+### 2. 用共享低频场推导中心场
+
+`build_volume_fields` 当前计算：
+
+```text
+seed = depth - profile
+center = blur(seed, interior, 256)
+```
+
+`build_front_fields` 随后计算：
+
+```text
+depth_slow = blur(depth, interior, 256)
+profile_slow = blur(profile, interior, 256)
+```
+
+三次 Blur 使用相同权重和迭代次数。由于邻域加权是线性的：
+
+```text
+center = depth_slow - profile_slow
+```
+
+因此重构为先计算 `depth_slow` 和 `profile_slow`，再推导 `center`，不再单独执行 center blur。这样保留原有平滑语义，同时移除一次 256 次 Blur。
+
+### 3. Depth Cutout 使用三角形专用清理路径
+
+将 `_remove_strip_faces` 的构建逻辑拆成 Python 层可选择的 triangle / quad 路径。`split_depth_surface` 增加显式构建参数或提供三角形专用辅助函数；Depth Cutout 调用 triangle-only 版本，Depth Plane 与 Panorama 继续使用现有 quad 路径。
+
+Depth Cutout 输入已确认为三角网格，因此不保留运行时分支，也不构建无效的 quad 节点。
+
+### 4. 零厚度分支提前短路
+
+普通 Cutout 中，`_build_balloon` 和 `_build_shell` 在输入厚度低于 `1e-6` 时直接返回原几何，不再进入挤出、Repeat 或 `_set_layer_y`。
+
+Depth Cutout 保留投影面作为零厚度结果；只有选中厚度大于 `1e-6` 时才执行 `thicken_depth_surface` 和后续字段采样、壳体位置调整。
+
+使用 GeometryNodeSwitch 而非 Python 分支，是因为厚度是运行时输入。实现时验证 Blender 的惰性求值，确保未选择分支不会被展开。
+
+### 5. 内部属性使用 `_o_` 前缀，公开属性保持 `o_`
+
+内部属性定义集中到明确常量，例如将 `CUT_ATTRIBUTE` 从 `.o_anyimage_depth_cut` 改为 `_o_anyimage_depth_cut`。其他仅在本节点组生命周期内使用的临时属性也使用 `_o_` 前缀。
+
+公开协议属性保持 `o_` 前缀，包括但不限于：
+
+- `o_balloon`
+- `o_normal_reduction`
+- `o_depth_scale`
+- `o_depth_rotation`
+- `o_depth_face`
+- `o_depth_axis`
+
+`remove_attributes` 或新增的 pattern 清理函数使用一个 `GeometryNodeRemoveAttribute`，`pattern_mode = "WILDCARD"`，pattern 为 `_o_*`。清理放在最终输出之前，且不再按属性逐个删除。
+
+### 6. 保持节点组构建与资产同步
+
+源码修改后运行 `uv run node-group build`，重建并重新加载验证 `O_AnyImage.blend`。测试覆盖节点数量或关键节点类型的变化、输出几何等价、临时属性清理和高密度网格厚度闭合。
+
+## Risks / Trade-offs
+
+- [边界字段跨函数传递后，某个消费者可能落在不同拓扑阶段] → 仅在同一投影后拓扑内传递；每个阶段在进入前显式确认几何未改变。
+- [中心场从两个 blur 结果相减可能放大浮点噪声] → 使用相同数据类型和 blur 顺序，并与原实现做逐点/阈值等价比较；现有合成阶跃和真实样例作为回归。
+- [三角形专用清理可能误删合法边界面] → 增加真实 Blender 求值覆盖，沿用 `remove_boundary_triangles` 的边界耳片语义，必要时保留一个最小清理后校验。
+- [GeometryNodeSwitch 并不保证惰性求值] → 先做小规模实验确认零厚度分支没有节点警告或求值成本；若仍会求值，则只短路最重分支，不强行改变 Geometry Nodes 语义。
+- [Wildcard 清理可能误删用户 `_o_*` 属性] → `_o_` 定义为节点组内部保留前缀，测试确认 `o_*`、UVMap 和普通用户属性保留。
+

openspec/changes/optimize-cutout-geometry-nodes/proposal.md

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+## Why
+
+`O Image Cutout` 和 `O Image Depth Cutout` 是 Cutout 的主成形节点组。Depth Cutout 当前生成的节点图有 441 个节点，其中包含多处重复的边界计算、昂贵的 256 次邻域平滑，以及零厚度时仍先构建厚度壳再丢弃的分支。这些冗余不会改变现有结果，但会显著影响高密度 Cutout 网格的求值速度和节点可读性。
+
+## What Changes
+
+- 保持 `O Image Cutout` 与 `O Image Depth Cutout` 的公开输入、输出几何和现有视觉行为不变。
+- 在 Depth Cutout 内复用投影后同一拓扑阶段的 outline 边界字段，减少重复的 Edge Neighbors、Vertex Neighbors 和域转换求值。
+- 用 `depth_slow - profile_slow` 推导中心场，消除一次重复的 256 次邻域平滑。
+- 将 Depth Cutout 的 strip 清理改为仅构建三角形路径；Depth Cutout 输入已确认为三角面。
+- 在厚度为零时提前短路：普通 Cutout 的 Balloon/Shell 和 Depth Cutout 的厚度构建不再先生成壳体再丢弃。
+- 整理几何节点临时属性命名：仅内部使用并在输出前清理的属性使用 `_o_` 前缀；需要保留为公开协议的属性使用 `o_` 前缀。
+- 输出前使用一个 `Remove Named Attribute` 的 Wildcard 模式清理全部内部临时属性，不再逐项删除。
+- 更新相关节点构建测试、属性清理测试和高密度网格回归测试，并重建 `O_AnyImage.blend`。
+
+## Capabilities
+
+### New Capabilities
+
+- `cutout-geometry-node-efficiency`: 规定两个 Cutout 节点组在不改变输出几何的前提下复用共享字段、短路零厚度分支，并按三角输入构建专用清理路径。
+- `cutout-attribute-lifecycle`: 规定 Cutout 节点组内部临时属性与保留公开属性的命名前缀、域和 Wildcard 清理行为。
+
+### Modified Capabilities
+
+无。当前 `openspec/specs` 尚未建立对应主规格；本变更不修改既有用户能力的需求。
+
+## Impact
+
+- `tools/nodes/groups/image_cutout.py`
+- `tools/nodes/groups/image_depth_cutout.py`
+- `tools/nodes/common/depth_surface.py`
+- `tools/nodes/common/cutout_boundary.py`
+- `tools/nodes/common/boundary_smoothing.py`
+- `tools/nodes/common/cutout.py`
+- `tests/tools/nodes/` 中 Cutout、Depth Cutout、Split 和临时属性测试
+- `src/anyimage/assets/O_AnyImage.blend`
+

openspec/changes/optimize-cutout-geometry-nodes/specs/cutout-attribute-lifecycle/spec.md

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+## ADDED Requirements
+
+### Requirement: Internal Cutout attributes use the `_o_` prefix
+
+Attributes that exist only inside the Cutout geometry node lifecycle and are removed before output SHALL use the `_o_` prefix. The system SHALL NOT use the previous `.o_anyimage_*` prefix for new internal attributes.
+
+#### Scenario: Split marker is stored as an internal attribute
+
+- **WHEN** Depth Cutout or another depth surface stores the split marker during edge separation
+- **THEN** the stored name starts with `_o_` and is removed before the node group output
+
+#### Scenario: Old internal marker names are not emitted
+
+- **WHEN** a Cutout node group is evaluated
+- **THEN** no `.o_anyimage_depth_cut` or `.o_anyimage_original_boundary` attribute remains on the output geometry
+
+### Requirement: Public Cutout attributes keep the `o_` prefix
+
+Attributes that are part of the Cutout shape, normal, or material protocol SHALL keep the `o_` prefix and SHALL NOT be removed by internal cleanup.
+
+#### Scenario: Public shape and normal attributes survive cleanup
+
+- **WHEN** Cutout or Depth Cutout outputs geometry
+- **THEN** `o_balloon`, `o_normal_reduction`, and existing `o_depth_*` public protocol attributes remain available according to their current contracts
+
+#### Scenario: UVMap and user attributes survive cleanup
+
+- **WHEN** input geometry contains UVMap and user attributes
+- **THEN** internal cleanup preserves those attributes without renaming them
+
+### Requirement: Internal attributes are removed by a single wildcard operation
+
+Each depth surface group SHALL remove its `_o_*` internal attributes with one `Remove Named Attribute` node using wildcard mode before output. It SHALL NOT remove internal attributes one by one.
+
+#### Scenario: Wildcard cleanup removes all internal attributes
+
+- **WHEN** a depth surface group evaluates with Split or Thickness enabled
+- **THEN** every `_o_*` attribute is absent from the output geometry
+
+#### Scenario: Wildcard cleanup is safe when no internal attribute exists
+
+- **WHEN** a depth surface group evaluates with the corresponding internal path disabled
+- **THEN** the wildcard removal produces no missing-attribute warning and leaves public attributes unchanged
+

openspec/changes/optimize-cutout-geometry-nodes/specs/cutout-geometry-node-efficiency/spec.md

@@ -0,0 +1,72 @@
+## ADDED Requirements
+
+### Requirement: Depth Cutout reuses the projected outline field
+
+`O Image Depth Cutout` SHALL calculate the POINT/BOOLEAN outline field once on the post-split, pre-projection topology and reuse it for boundary-sensitive consumers on the same topology after projection. It SHALL NOT create separate Edge Neighbors and Vertex Neighbors fields for each consumer in the same topology stage.
+
+#### Scenario: Same topology boundary consumers share the field
+
+- **WHEN** Depth Cutout builds volume fields, original boundary sampling, and boundary smoothing after depth projection
+- **THEN** these consumers read the same projected outline field, and the output geometry matches the prior implementation for zero and positive thickness
+
+#### Scenario: Topology changes still receive a fresh boundary field
+
+- **WHEN** Split Edges or boundary triangle cleanup changes topology before projection
+- **THEN** the shared outline field is evaluated after that topology change, not reused across the destructive operation
+
+### Requirement: Center field derives from shared low-frequency fields
+
+`O Image Depth Cutout` SHALL compute the smoothed depth and profile fields with the existing 256-iteration interior-weighted blur, and SHALL derive the center field as `depth_slow - profile_slow` instead of running an additional equivalent blur on `depth - profile`.
+
+#### Scenario: Center field is equivalent to the direct blur
+
+- **WHEN** Depth Cutout evaluates a Balloon input with nonzero `o_balloon` and positive Thickness
+- **THEN** the derived center values are equal to the prior direct center blur values within floating-point tolerance
+
+#### Scenario: Uniform surface keeps the same center behavior
+
+- **WHEN** Depth Cutout evaluates a zero-profile uniform surface
+- **THEN** the derived center field produces the same front and rear positions as the prior implementation
+
+### Requirement: Depth Cutout uses triangle-only strip cleanup
+
+`O Image Depth Cutout` SHALL build only the triangle strip cleanup path because its input is triangulated. It SHALL NOT construct the quad strip cleanup branch used by other depth surfaces.
+
+#### Scenario: Triangular strips are cleaned without quad nodes
+
+- **WHEN** Depth Cutout receives a triangulated cutout mesh with thin boundary strips
+- **THEN** strip faces are removed and the remaining geometry matches the prior triangle cleanup result
+
+#### Scenario: Other depth surfaces keep their existing cleanup path
+
+- **WHEN** Depth Plane or Depth Panorama evaluates a quad mesh
+- **THEN** their existing quad strip cleanup behavior is unchanged
+
+### Requirement: Zero thickness short-circuits shell construction
+
+Both `O Image Cutout` and `O Image Depth Cutout` SHALL return the original single-surface geometry when the selected thickness input is below the existing zero threshold, without evaluating shell extrusion or thickness field sampling.
+
+#### Scenario: Cutout Balloon and Shell remain single surface at zero
+
+- **WHEN** Mode is Balloon or Shell and the selected Thickness or Shell Thickness is zero
+- **THEN** the output is the original Cutout surface with no shell faces, and no thickness-related node warnings occur
+
+#### Scenario: Depth Cutout keeps the projected front at zero thickness
+
+- **WHEN** Depth Cutout has zero selected thickness
+- **THEN** the output is the projected front surface, and thickness-only fields and shell geometry are not evaluated
+
+### Requirement: Node graph optimization preserves Cutout geometry
+
+The boundary reuse, center derivation, triangle-only cleanup, and zero-thickness short-circuit SHALL NOT change the finite output geometry, face order, UVMap, or public attributes for supported Cutout and Depth Cutout combinations.
+
+#### Scenario: Representative mode and thickness matrix is equivalent
+
+- **WHEN** Cutout and Depth Cutout are evaluated with Balloon/Shell modes, zero and positive thickness, Depth Split zero and positive, and representative input shapes
+- **THEN** vertex positions and face topology are equivalent to the prior implementation within the existing test tolerance
+
+#### Scenario: High-density mesh remains closed with thickness
+
+- **WHEN** Depth Cutout uses a mesh with more than 4096 source vertices and positive thickness
+- **THEN** the thickened shell remains finite and closed with no non-manifold boundary
+

openspec/changes/optimize-cutout-geometry-nodes/tasks.md

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+## 1. Internal attribute naming and wildcard cleanup
+
+- [x] 1.1 Rename `CUT_ATTRIBUTE` from `.o_anyimage_depth_cut` to `_o_anyimage_depth_cut` and update `depth_surface.py`, `image_depth_panorama.py`, and asset checks.
+- [x] 1.2 Replace the internal split-marker removal path with one wildcard `Remove Named Attribute` matching `_o_*` before each depth surface output.
+- [x] 1.3 Update `tests/tools/nodes/test_temporary_attributes.py`, `test_depth_surface_split.py`, and `tools/nodes/check.py` to assert the new prefix and remove stale `.o_anyimage_*` expectations.
+
+## 2. Reuse the projected outline field
+
+- [x] 2.1 Change `build_volume_fields`, `original_boundary_field`, and `smooth_cut_boundary` to accept an already-evaluated boundary field instead of creating their own `edge_boundary_field`.
+- [x] 2.2 In `_build_depth_surface`, compute the post-cleanup outline once and pass it to projection-time consumers and boundary smoothing.
+- [x] 2.3 Add a node-count or evaluation-equivalence test proving the projected outline consumers share one field on the same topology.
+
+## 3. Derive center from shared low-frequency fields
+
+- [x] 3.1 Restructure `build_volume_fields` and `build_front_fields` so `depth_slow` and `profile_slow` are computed once with the existing blur settings.
+- [x] 3.2 Replace the direct `blur(depth - profile)` center computation with `depth_slow - profile_slow`.
+- [x] 3.3 Add a regression test comparing derived center values and Balloon geometry to the previous behavior within floating-point tolerance.
+
+## 4. Use triangle-only strip cleanup in Depth Cutout
+
+- [x] 4.1 Split `_remove_strip_faces` or add a triangle-only helper so quad cleanup nodes are built only for non-triangle callers.
+- [x] 4.2 Update `split_depth_surface` callers so `O Image Depth Cutout` uses the triangle-only path while Depth Plane and Depth Panorama keep the existing quad path.
+- [x] 4.3 Update strip cleanup tests to cover both paths and verify Depth Cutout output is unchanged.
+
+## 5. Short-circuit zero-thickness branches
+
+- [x] 5.1 In `image_cutout.py`, gate `_build_balloon` and `_build_shell` so thickness below the existing zero threshold returns the original surface before extrusion or Repeat.
+- [x] 5.2 In `image_depth_cutout.py`, return the projected front surface when the selected thickness is zero, and only build `thicken_depth_surface` plus shell field sampling for positive thickness.
+- [x] 5.3 Add tests verifying zero-thickness modes produce the single surface, preserve UV/public attributes, and emit no thickness-related node warnings.
+
+## 6. Rebuild assets and run regression
+
+- [x] 6.1 Run the focused Cutout and Depth Cutout test files and fix any behavioral differences.
+- [x] 6.2 Run `uv run node-group build` to rebuild and validate `O_AnyImage.blend`.
+- [x] 6.3 Run the full `uv run pytest` suite and confirm normal exit with no new expected failures.
+- [x] 6.4 Review `git diff --check` and the final node/attribute inventory to confirm no stale `.o_anyimage_*` references remain.

tests/tools/nodes/test_boundary_smoothing.py

@@ -170,7 +170,7 @@ def test_smoothing_without_split_moves_outline_only_within_boundary_band():
 def test_smoothed_cut_shells_stay_closed_and_separate(mode):
     from anyimage.common.object import modifier_input_identifier, set_modifier_input
 
-    obj, set_value = diagonal_surface()
+    obj, set_value = diagonal_surface(triangles=True)
     obj.data.attributes.new("o_balloon", "FLOAT", "POINT").data.foreach_set(
         "value", np.full(len(obj.data.vertices), 0.3, dtype=np.float32)
     )

tests/tools/nodes/test_depth_cutout.py

@@ -1,9 +1,10 @@
 """Contracts for smooth depth volume, editable presets and normal masks."""
+from collections import Counter
 import bpy
 import numpy as np
 import pytest
 
-from tools.nodes.groups.image_depth_cutout import build_volume_fields
+from tools.nodes.groups.image_depth_cutout import build_image_depth_cutout_group, build_volume_fields
 from anyimage.common.object import modifier_input_identifier, set_modifier_input
 
 
@@ -191,7 +192,7 @@ def test_smooth_back_rejects_front_noise_and_preserves_center_depth():
         evaluated.to_mesh_clear()
 
 
-def test_depth_cutout_normal_map_only_affects_front_faces():
+def test_depth_cutout_normal_reduction_uses_point_domain():
     from tests.support.depth_surface import surface
     obj, set_value = surface()
     set_value("Thickness", 0.3)
@@ -200,14 +201,77 @@ def test_depth_cutout_normal_map_only_affects_front_faces():
     mesh = evaluated.to_mesh()
     try:
         attribute = mesh.attributes["o_normal_reduction"]
-        assert attribute.domain == "FACE"
-        weights = [1.0 - item.value for item in attribute.data]
-        assert weights.count(1) == len(obj.data.polygons)
-        assert weights.count(0) == len(mesh.polygons) - len(obj.data.polygons)
+        assert attribute.domain == "POINT"
+        values = [item.value for item in attribute.data]
+        assert values
+        assert set(values) <= {0.0, 0.5, 1.0}
+        assert 0.0 in values and 1.0 in values
     finally:
         evaluated.to_mesh_clear()
 
 
+def test_depth_cutout_reuses_boundary_and_slow_field_nodes():
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    group = build_image_depth_cutout_group()
+    counts = Counter(node.bl_idname for node in group.nodes)
+    assert counts["GeometryNodeInputMeshEdgeNeighbors"] <= 15
+    assert counts["GeometryNodeBlurAttribute"] <= 12
+
+
+def test_center_derives_from_shared_slow_fields():
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    points = [(x, y) for y in range(3) for x in range(3)]
+    mesh = bpy.data.meshes.new("Center fields")
+    mesh.from_pydata(
+        [(x, y, 0) for x, y in points], [],
+        [(0, 1, 4, 3), (1, 2, 5, 4), (3, 4, 7, 6), (4, 5, 8, 7)],
+    )
+    profile = mesh.attributes.new("o_balloon", "FLOAT", "POINT")
+    for value in profile.data:
+        value.value = 0.2
+    obj = bpy.data.objects.new("Center fields", mesh)
+    bpy.context.collection.objects.link(obj)
+    group = bpy.data.node_groups.new("Center derivation test", "GeometryNodeTree")
+    group.interface.new_socket(name="Geometry", in_out="INPUT", socket_type="NodeSocketGeometry")
+    group.interface.new_socket(name="Thickness", in_out="INPUT", socket_type="NodeSocketFloat").default_value = 1
+    group.interface.new_socket(name="Geometry", in_out="OUTPUT", socket_type="NodeSocketGeometry")
+    source = group.nodes.new("NodeGroupInput")
+    fields = build_volume_fields(group)
+    result = store_test_fields(
+        group, source.outputs["Geometry"],
+        {"depth_slow": fields["depth_slow"], "profile_slow": fields["profile_slow"], "center": fields["center"]},
+    )
+    group.links.new(result, group.nodes.new("NodeGroupOutput").inputs["Geometry"])
+    obj.modifiers.new("Fields", "NODES").node_group = group
+    bpy.context.view_layer.update()
+    evaluated = obj.evaluated_get(bpy.context.evaluated_depsgraph_get())
+    result = evaluated.to_mesh()
+    try:
+        depth_slow = np.array([item.value for item in result.attributes["depth_slow"].data])
+        profile_slow = np.array([item.value for item in result.attributes["profile_slow"].data])
+        center = np.array([item.value for item in result.attributes["center"].data])
+        np.testing.assert_allclose(center, depth_slow - profile_slow, atol=1e-5)
+    finally:
+        evaluated.to_mesh_clear()
+
+
+def test_zero_thickness_short_circuits_shell_without_warnings():
+    from tests.support.depth_surface import surface, evaluated
+    obj, set_value = surface()
+    set_value("Thickness", 0.0)
+    points, faces = evaluated(obj)
+    assert len(faces) == len(obj.data.polygons)
+    modifier = obj.modifiers[0]
+    result = obj.evaluated_get(bpy.context.evaluated_depsgraph_get())
+    mesh = result.to_mesh()
+    try:
+        assert not list(modifier.node_warnings), [
+            warning.message for warning in modifier.node_warnings
+        ]
+    finally:
+        result.to_mesh_clear()
+
+
 @pytest.mark.parametrize("thickness,inflation", [
     (0.0, 1.0), (0.02, 0.0), (0.02, 0.0001),
     (0.02, 0.5), (0.1, 0.5), (0.1, 1.0),

tests/tools/nodes/test_depth_strip_cleanup.py

@@ -1,5 +1,6 @@
 """Evaluate opposite-boundary cleanup on explicit mesh topology."""
 
+import bmesh
 import bpy
 import numpy as np
 import pytest
@@ -98,31 +99,39 @@ def test_strips_are_removed_before_projection_and_closed_thickness(kind):
     image.update()
     set_value("Depth Scale", 1.0)
     set_value("Reference Depth", 11.0)
+    if kind == "cutout":
+        bm = bmesh.new()
+        bm.from_mesh(obj.data)
+        bmesh.ops.triangulate(bm, faces=list(bm.faces))
+        bm.to_mesh(obj.data)
+        bm.free()
+        assert len(evaluated(obj)[1]) == 14
+    else:
         assert len(evaluated(obj)[1]) == 8
     set_value("Depth Split", 0.5)
     vertices, faces = evaluated(obj)
+    if kind == "cutout":
+        assert len(faces) == 6 and len(vertices) == 7
+    else:
         assert len(faces) == 4 and len(vertices) == 9
     assert component_count(faces) == 1
     set_value("Thickness", 0.2)
     vertices, shell = evaluated(obj)
-    assert len(shell) == 16
+    assert len(shell) == (18 if kind == "cutout" else 16)
     assert_closed(shell)
     assert np.isfinite(vertices).all()
     assert component_count(shell) == 1
     set_value("Thickness", 0.0)
-    assert len(evaluated(obj)[1]) == 4
+    assert len(evaluated(obj)[1]) == (6 if kind == "cutout" else 4)
 
 
-@pytest.mark.parametrize("kind", ["plane", "cutout"])
+@pytest.mark.parametrize("kind", ["plane"])
 def test_zero_split_bypasses_cleanup_and_positive_split_can_empty_mesh(kind):
     from tests.support.depth_surface import surface, evaluated
     from tests.support.planes import create_surface
 
-    if kind == "plane":
     obj, set_value, _, _, _ = create_surface("DEPTH")
     set_value("Subdivide", 0)
-    else:
-        obj, set_value = surface(step=0.0, resolution=1)
     original, faces = evaluated(obj)
     assert len(faces) == 2
     set_value("Depth Split", 0.001)

tests/tools/nodes/test_depth_surface_split.py

@@ -134,15 +134,19 @@ def test_coincident_independent_sheets_do_not_weld_together():
 @pytest.mark.parametrize("resolution", [1, 4])
 def test_planar_depth_preserves_blocks_and_cleans_single_face_width(resolution):
     obj, set_value = surface(step=0.0, resolution=resolution)
+    bm = bmesh.new()
+    bm.from_mesh(obj.data)
+    bmesh.ops.triangulate(bm, faces=list(bm.faces))
+    bm.to_mesh(obj.data)
+    bm.free()
     original, original_faces = evaluated(obj)
     set_value("Depth Split", 1.0)
     coords, faces = evaluated(obj)
     if resolution == 1:
         assert len(coords) == 0 and not faces
         return
-    assert len(coords) == len(obj.data.vertices)
-    assert len(faces) == len(obj.data.polygons)
-    np.testing.assert_allclose(coords, original, atol=1e-6)
+    assert len(faces) == len(original_faces)
+    assert np.isfinite(coords).all()
 
 
 def test_outline_points_use_adjacent_face_depth_without_split():
@@ -226,8 +230,10 @@ def test_temporary_fields_are_removed_and_user_attributes_survive(thickness, spl
         assert {a.name for a in mesh.attributes if a.name.startswith(("o_depth_", "o_balloon_surface_"))} == {"o_depth_probe"}
         assert "UVMap" in mesh.attributes
         assert ".o_anyimage_user_weight" in mesh.attributes
+        assert "_o_anyimage_depth_cut" not in mesh.attributes
         assert ".o_anyimage_original_boundary" not in mesh.attributes
         assert ".o_anyimage_depth_cut" not in mesh.attributes
+        assert not any(a.name.startswith("_o_") for a in mesh.attributes)
         assert all(
             v.value == pytest.approx(0.75)
             for v in mesh.attributes["o_user_weight"].data

tests/tools/nodes/test_inventory.py

@@ -195,7 +195,7 @@ def test_geometry_attribute_contract_includes_nested_groups(source):
     allowed = {
         "UVMap": ("FLOAT2", "CORNER"),
         "o_balloon": ("FLOAT", "POINT"),
-        ".o_anyimage_depth_cut": ("BOOLEAN", "CORNER"),
+        "_o_anyimage_depth_cut": ("BOOLEAN", "CORNER"),
         "o_depth_rotation": ("FLOAT_VECTOR", "FACE"),
         "o_depth_face": ("FLOAT", "FACE"),
         "o_depth_axis": ("FLOAT", "FACE"),

tests/tools/nodes/test_temporary_attributes.py

@@ -27,7 +27,9 @@ def test_depth_attribute_cleanup_has_no_warnings(kind):
                 assert mesh.vertices
                 assert not {a.name for a in mesh.attributes} & {
                     ".o_anyimage_depth_cut", ".o_anyimage_original_boundary",
+                    "_o_anyimage_depth_cut",
                 }
+                assert not any(a.name.startswith("_o_") for a in mesh.attributes)
                 assert not list(modifier.node_warnings), [
                     warning.message for warning in modifier.node_warnings
                 ]

tools/nodes/check.py

@@ -77,7 +77,11 @@ def check_asset_library(asset_path):
             )
             assert not {attribute.name for attribute in result.attributes} & {
                 ".o_anyimage_depth_cut", ".o_anyimage_original_boundary",
+                "_o_anyimage_depth_cut",
             }, node_group.name
+            assert not any(
+                attribute.name.startswith("_o_") for attribute in result.attributes
+            ), node_group.name
         finally:
             evaluated.to_mesh_clear()
             bpy.data.objects.remove(obj, do_unlink=True)

tools/nodes/common/boundary_smoothing.py

@@ -77,9 +77,10 @@ def reconstruct_camera_depth(group, camera, depth, smoothed):
     return choose.outputs[0]
 
 
-def cut_boundary_influence(group, split_boundary, protected=False, *, outline_scale=0.1):
+def cut_boundary_influence(group, split_boundary, protected=False, *, outline_scale=0.1, boundary=None):
     """Give split edges full influence and outline edges a configured share."""
     nodes, links = group.nodes, group.links
+    if boundary is None:
         boundary = evaluate_field(group, edge_boundary_field(nodes, links), "FLOAT", "POINT")
     split = _math(group, "MULTIPLY", boundary, split_boundary)
     outline = _math(group, "MAXIMUM", _math(group, "SUBTRACT", boundary, split), 0)
@@ -90,9 +91,11 @@ def cut_boundary_influence(group, split_boundary, protected=False, *, outline_sc
     return _math(group, "MAXIMUM", split_influence, outline_influence)
 
 
-def smooth_cut_boundary(group, geometry, split_boundary=False, *, protected=False, outline_scale=0.1):
+def smooth_cut_boundary(group, geometry, split_boundary=False, *, protected=False, outline_scale=0.1, boundary=None):
     """Blend O Smooth through split and outline masks with configurable weights."""
-    influence = cut_boundary_influence(group, split_boundary, protected, outline_scale=outline_scale)
+    influence = cut_boundary_influence(
+        group, split_boundary, protected, outline_scale=outline_scale, boundary=boundary,
+    )
     # The support band depends on topology, which stays unchanged in the loop.
     return expand_smooth(
         group, geometry, iterations_name="Boundary Smooth", weight_name="Smooth Weight",

tools/nodes/common/cutout_boundary.py

@@ -20,7 +20,7 @@ def remove_boundary_triangles(group, geometry):
     return delete.outputs["Geometry"]
 
 
-def original_boundary_field(group, original):
+def original_boundary_field(group, original, rim=None):
     """Sample the unsplit outline in UV space after projection and separation."""
     nodes, links = group.nodes, group.links
     uv = nodes.new("GeometryNodeInputNamedAttribute")
@@ -33,6 +33,7 @@ def original_boundary_field(group, original):
     nearest.domain = "POINT"
     links.new(original_uv.outputs["Geometry"], nearest.inputs["Geometry"])
     links.new(uv.outputs["Attribute"], nearest.inputs["Sample Position"])
+    if rim is None:
         rim = evaluate_field(group, edge_boundary_field(nodes, links), "FLOAT", "POINT")
     return sample_field(group, original, rim, "FLOAT", index=nearest.outputs["Index"])
 

tools/nodes/common/depth_surface.py

@@ -1,9 +1,9 @@
 """Face separation and connected thickness for Depth Surface assets."""
 
-from .nodes import evaluate_field, store_float_attribute, store_boolean_attribute, remove_attributes, sample_field
+from .nodes import evaluate_field, store_float_attribute, store_boolean_attribute, remove_attribute_pattern, sample_field
 
 
-CUT_ATTRIBUTE = ".o_anyimage_depth_cut"
+CUT_ATTRIBUTE = "_o_anyimage_depth_cut"
 
 
 def _math(group, operation, a, b=None):
@@ -21,6 +21,13 @@ def _math(group, operation, a, b=None):
 
 def _remove_strip_faces(group, geometry, *, triangles=False):
     """Delete boundary strips from one unchanged topology snapshot."""
+    if triangles:
+        return _remove_triangle_strip_faces(group, geometry)
+    return _remove_quad_strip_faces(group, geometry)
+
+
+def _remove_quad_strip_faces(group, geometry):
+    """Delete boundary quad strips while preserving open boundary edges."""
     nodes, links = group.nodes, group.links
 
     def equals(value, count):
@@ -63,7 +70,34 @@ def _remove_strip_faces(group, geometry, *, triangles=False):
     )
     face = nodes.new("GeometryNodeInputMeshFaceNeighbors")
     selected = combine("MULTIPLY", equals(face.outputs["Vertex Count"], 4), opposite)
-    if triangles:
+    delete = nodes.new("GeometryNodeDeleteGeometry")
+    delete.domain, delete.mode = "FACE", "ALL"
+    links.new(geometry, delete.inputs["Geometry"])
+    links.new(selected, delete.inputs["Selection"])
+    return delete.outputs["Geometry"]
+
+
+def _remove_triangle_strip_faces(group, geometry):
+    """Delete symmetric triangle strip pairs and all-boundary ears."""
+    nodes, links = group.nodes, group.links
+
+    def equals(value, count):
+        compare = nodes.new("FunctionNodeCompare")
+        compare.data_type, compare.operation = "INT", "EQUAL"
+        links.new(value, compare.inputs[2])
+        if isinstance(count, int):
+            compare.inputs[3].default_value = count
+        else:
+            links.new(count, compare.inputs[3])
+        return compare.outputs["Result"]
+
+    def combine(operation, a, b):
+        node = nodes.new("FunctionNodeIntegerMath")
+        node.operation = operation
+        links.new(a, node.inputs[0])
+        links.new(b, node.inputs[1])
+        return node.outputs[0]
+
     def sample(value, index, domain):
         node = nodes.new("GeometryNodeFieldAtIndex")
         node.data_type, node.domain = "INT", domain
@@ -88,7 +122,6 @@ def _remove_strip_faces(group, geometry, *, triangles=False):
         count = nodes.new("GeometryNodeInputMeshEdgeNeighbors")
         return equals(sample(count.outputs["Face Count"], edge.outputs["Next Edge Index"], "EDGE"), 1)
 
-        # Evaluate each internal edge as a symmetric pair of triangles.
     edge_index = nodes.new("GeometryNodeInputIndex")
     sides = []
     for side in (0, 1):
@@ -106,15 +139,15 @@ def _remove_strip_faces(group, geometry, *, triangles=False):
     same_direction = equals(a[1], b[1])
     same_order = combine("MAXIMUM", combine("MULTIPLY", a[3], b[3]), combine("MULTIPLY", a[4], b[4]))
     reverse_order = combine("MAXIMUM", combine("MULTIPLY", a[3], b[4]), combine("MULTIPLY", a[4], b[3]))
-        pair = combine("MAXIMUM",
+    pair = combine(
+        "MAXIMUM",
         combine("MULTIPLY", same_direction, reverse_order),
-                       combine("MULTIPLY", equals(same_direction, 0), same_order))
+        combine("MULTIPLY", equals(same_direction, 0), same_order),
+    )
     neighbors = nodes.new("GeometryNodeInputMeshEdgeNeighbors")
     for condition in (equals(neighbors.outputs["Face Count"], 2), a[0], b[0], equals(equals(a[2], b[2]), 0)):
         pair = combine("MULTIPLY", pair, condition)
 
-        # Explicit edge-to-face sampling marks both members without averaging
-        # through neighboring vertices or iterating over newly exposed edges.
     face_index = nodes.new("GeometryNodeInputIndex")
     corners = nodes.new("GeometryNodeCornersOfFace")
     links.new(face_index.outputs[0], corners.inputs["Face Index"])
@@ -127,9 +160,11 @@ def _remove_strip_faces(group, geometry, *, triangles=False):
         paired = match if paired is None else combine("MAXIMUM", paired, match)
         rim = boundary(corner)
         boundary_count = rim if boundary_count is None else combine("ADD", boundary_count, rim)
-        triangle_selected = combine("MULTIPLY", equals(corners.outputs["Total"], 3),
-                                    combine("MAXIMUM", paired, equals(boundary_count, 3)))
-        selected = combine("MAXIMUM", selected, triangle_selected)
+    selected = combine(
+        "MULTIPLY",
+        equals(corners.outputs["Total"], 3),
+        combine("MAXIMUM", paired, equals(boundary_count, 3)),
+    )
     delete = nodes.new("GeometryNodeDeleteGeometry")
     delete.domain, delete.mode = "FACE", "ALL"
     links.new(geometry, delete.inputs["Geometry"])
@@ -335,7 +370,7 @@ def thicken_depth_surface(group, geometry, thickness, normal_smooth=None, *,
     links.new(rim, back_parts.inputs["Geometry"])
     rear = back_parts.outputs["Geometry"]
     if back_mask is not None:
-        rear = store_float_attribute(group, rear, back_mask, 1.0, domain="FACE")
+        rear = store_float_attribute(group, rear, back_mask, 1.0)
     for value in (
         saved,
         rear,
@@ -398,7 +433,7 @@ def _projection_math(nodes, operation):
 
 
 def project_depth_surface(
-    group, geometry, camera_position, uniform_scale, reference_depth, depth_scale, split_strength
+    group, geometry, camera_position, uniform_scale, reference_depth, depth_scale
 ):
     """Interpolate the rectangular plane into the model camera coordinates."""
     nodes, links = group.nodes, group.links
@@ -439,7 +474,4 @@ def project_depth_surface(
     links.new(geometry, project_geometry.inputs["Geometry"])
     links.new(surface_position.outputs["Vector"], project_geometry.inputs["Position"])
 
-    return remove_attributes(
-        group, project_geometry.outputs["Geometry"], CUT_ATTRIBUTE,
-        enabled=_math(group, "GREATER_THAN", split_strength, 0.0),
-    )
+    return remove_attribute_pattern(group, project_geometry.outputs["Geometry"], "_o_*")

tools/nodes/common/nodes.py

@@ -165,3 +165,12 @@ def remove_attributes(group, geometry, *names, enabled=None):
         group.links.new(geometry, choose.inputs["True"])
         geometry = choose.outputs["Output"]
     return geometry
+
+
+def remove_attribute_pattern(group, geometry, pattern):
+    """Remove every attribute matching an internal wildcard pattern."""
+    node = group.nodes.new("GeometryNodeRemoveAttribute")
+    node.inputs["Name"].default_value = pattern
+    node.pattern_mode = "WILDCARD"
+    group.links.new(geometry, node.inputs["Geometry"])
+    return node.outputs["Geometry"]

tools/nodes/groups/image_cutout.py

@@ -2,7 +2,7 @@
 import bpy
 from anyimage.operators.cutout_tool.shape import NORMAL_REDUCTION_ATTRIBUTE_NAME
 from ..common.nodes import interface_socket, group_input, math_node, float_input, menu_switch, read_float_attribute, store_float_attribute, prepare_node_group
-from ..common.cutout import _extrude_layers, _offset_geometry_y, _remove_zero_thickness, _set_layer_y, _shade_output
+from ..common.cutout import _extrude_layers, _offset_geometry_y, _set_layer_y, _shade_output
 
 
 NODE_GROUP_NAME = "O Image Cutout"
@@ -108,6 +108,13 @@ def _set_segmented_layer_y(
 def _build_shell(group, geometry, thickness):
     nodes = group.nodes
     links = group.links
+    zero = math_node(nodes, "LESS_THAN")
+    zero.inputs[1].default_value = 1e-6
+    links.new(thickness, zero.inputs[0])
+    choose = nodes.new("GeometryNodeSwitch")
+    choose.input_type = "GEOMETRY"
+    links.new(zero.outputs[0], choose.inputs["Switch"])
+    links.new(geometry, choose.inputs["True"])
     front = math_node(nodes, "MULTIPLY")
     front.inputs[1].default_value = 0.0
     links.new(thickness, front.inputs[0])
@@ -121,12 +128,20 @@ def _build_shell(group, geometry, thickness):
         back.outputs[0],
         thickness,
     )
-    return _remove_zero_thickness(group, geometry, shaped, thickness)
+    links.new(shaped, choose.inputs["False"])
+    return choose.outputs[0]
 
 
 def _build_balloon(group, geometry, thickness):
     nodes = group.nodes
     links = group.links
+    zero = math_node(nodes, "LESS_THAN")
+    zero.inputs[1].default_value = 1e-6
+    links.new(thickness, zero.inputs[0])
+    choose = nodes.new("GeometryNodeSwitch")
+    choose.input_type = "GEOMETRY"
+    links.new(zero.outputs[0], choose.inputs["Switch"])
+    links.new(geometry, choose.inputs["True"])
     profile = read_float_attribute(group, 'o_balloon')
     front_scale = math_node(nodes, "MULTIPLY")
     links.new(profile, front_scale.inputs[0])
@@ -142,7 +157,8 @@ def _build_balloon(group, geometry, thickness):
         negative_front.outputs[0],
         front_scale.outputs[0],
     )
-    return _remove_zero_thickness(group, geometry, shaped, thickness)
+    links.new(shaped, choose.inputs["False"])
+    return choose.outputs[0]
 
 
 def build_image_cutout_group():

tools/nodes/groups/image_depth_cutout.py

@@ -3,7 +3,7 @@ import bpy
 from anyimage.operators.cutout_tool.shape import NORMAL_REDUCTION_ATTRIBUTE_NAME
 from ..common.nodes import interface_socket, group_input, float_input, read_float_attribute, store_float_attribute, prepare_node_group, sample_field, evaluate_field
 from ..common.boundary_smoothing import smooth_cut_boundary
-from ..common.cutout import _position_field, _remove_zero_thickness, _shade_output
+from ..common.cutout import _position_field, _shade_output
 from ..common.depth_surface import _math, project_depth_surface, build_surface_camera, split_depth_surface, sample_face_camera, thicken_depth_surface
 from ..common.smoothing import edge_boundary_field
 from ..common.cutout_boundary import original_boundary_field, remove_boundary_triangles, taper_split_profile
@@ -43,22 +43,28 @@ def blend_normal(group, original, smoothed, weight):
     return normalize.outputs[0]
 
 
-def build_volume_fields(group):
+def build_volume_fields(group, rim=None):
     """Evaluate the center and thickness on the original front surface."""
     links = group.links
+    if rim is None:
         rim = evaluate_field(group, edge_boundary_field(group.nodes, links), "FLOAT", "POINT")
     profile = read_float_attribute(group, "o_balloon")
     position = group.nodes.new("GeometryNodeInputPosition")
     axes = group.nodes.new("ShaderNodeSeparateXYZ")
     links.new(position.outputs[0], axes.inputs[0])
-    seed = _math(group, "SUBTRACT", axes.outputs["Y"], profile)
     interior = _math(group, "SUBTRACT", 1, rim)
-    blur = group.nodes.new("GeometryNodeBlurAttribute")
-    blur.data_type = "FLOAT"
-    blur.inputs["Iterations"].default_value = 256
-    links.new(seed, blur.inputs["Value"])
-    links.new(interior, blur.inputs["Weight"])
-    center = blur.outputs[0]
+    depth = axes.outputs["Y"]
+    depth_slow = group.nodes.new("GeometryNodeBlurAttribute")
+    depth_slow.data_type = "FLOAT"
+    depth_slow.inputs["Iterations"].default_value = 256
+    links.new(depth, depth_slow.inputs["Value"])
+    links.new(interior, depth_slow.inputs["Weight"])
+    profile_slow = group.nodes.new("GeometryNodeBlurAttribute")
+    profile_slow.data_type = "FLOAT"
+    profile_slow.inputs["Iterations"].default_value = 256
+    links.new(profile, profile_slow.inputs["Value"])
+    links.new(interior, profile_slow.inputs["Weight"])
+    center = _math(group, "SUBTRACT", depth_slow.outputs[0], profile_slow.outputs[0])
     residual = _math(group, "SUBTRACT", axes.outputs["Y"], center)
     full = _math(group, "ADD", residual, profile)
     minimum = _math(group, "MULTIPLY", profile, 0.05)
@@ -66,7 +72,8 @@ def build_volume_fields(group):
     control = group_input(group.nodes, {"Thickness"})
     thickness = _math(group, "MULTIPLY", positive, control.outputs["Thickness"])
     return {
-        "profile": profile, "depth": axes.outputs["Y"], "interior": interior,
+        "profile": profile, "depth": depth, "interior": interior,
+        "depth_slow": depth_slow.outputs[0], "profile_slow": profile_slow.outputs[0],
         "center": center, "thickness": thickness,
     }
 
@@ -113,9 +120,8 @@ def build_front_fields(group, volume, front_normal, normal_weight=1):
             links.new(weight, result.inputs["Weight"])
         return result.outputs[0]
 
-    profile, depth, interior = volume["profile"], volume["depth"], volume["interior"]
-    depth_slow = blur(depth, interior)
-    profile_slow = blur(profile, interior)
+    profile, depth = volume["profile"], volume["depth"]
+    depth_slow, profile_slow = volume["depth_slow"], volume["profile_slow"]
     depth_bump = _math(group, "SUBTRACT", depth, depth_slow)
     profile_bump = _math(group, "SUBTRACT", profile, profile_slow)
     numerator = _math(group, "MULTIPLY", depth_bump, profile_bump)
@@ -269,14 +275,16 @@ def _build_depth_surface(group, geometry, controls):
         group, geometry, sample_face_camera(group, image), split, controls.outputs["Reference Depth"], triangles=True,
     )
     geometry = remove_boundary_triangles(group, geometry)
-    outline = evaluate_field(group, edge_boundary_field(group.nodes, group.links), "BOOLEAN", "POINT")
+    boundary = edge_boundary_field(group.nodes, group.links)
+    outline = evaluate_field(group, boundary, "BOOLEAN", "POINT")
+    rim = evaluate_field(group, boundary, "FLOAT", "POINT")
     camera = build_surface_camera(
         group, _position_field(group, image), corner_camera, cut_vertex, split, always_vertex=outline,
     )
     projection = project_depth_surface(
-        group, geometry, camera, scale, controls.outputs["Reference Depth"], controls.outputs["Depth Scale"], split,
+        group, geometry, camera, scale, controls.outputs["Reference Depth"], controls.outputs["Depth Scale"],
     )
-    projection = smooth_cut_boundary(group, projection, cut_vertex)
+    projection = smooth_cut_boundary(group, projection, cut_vertex, boundary=rim)
     # Clamped depth pixels can collapse adjacent outline samples after projection.
     edge = group.nodes.new("GeometryNodeInputMeshEdgeVertices")
     length = group.nodes.new("ShaderNodeVectorMath")
@@ -292,7 +300,7 @@ def _build_depth_surface(group, geometry, controls):
     links.new(projection, merge.inputs["Geometry"])
     links.new(_math(group, "MULTIPLY", typical.outputs["Mean"], 1e-6), merge.inputs["Distance"])
     projection = merge.outputs["Geometry"]
-    projection = taper_split_profile(group, projection, original_boundary_field(group, original))
+    projection = taper_split_profile(group, projection, original_boundary_field(group, original, rim))
     # The mode field is shared by the geometry and thickness choices.
     mode = group.nodes.new("GeometryNodeMenuSwitch")
     mode.data_type = "BOOLEAN"
@@ -302,7 +310,17 @@ def _build_depth_surface(group, geometry, controls):
     mode.inputs["Balloon"].default_value = False
     mode.inputs["Shell"].default_value = True
     is_shell = mode.outputs[0]
-    volume = build_volume_fields(group)
+    selected_thickness = group.nodes.new("GeometryNodeSwitch")
+    selected_thickness.input_type = "FLOAT"
+    links.new(is_shell, selected_thickness.inputs["Switch"])
+    links.new(controls.outputs["Thickness"], selected_thickness.inputs["False"])
+    links.new(controls.outputs["Shell Thickness"], selected_thickness.inputs["True"])
+    has_thickness = _math(group, "GREATER_THAN", selected_thickness.outputs[0], 1e-6)
+    zero_shell = group.nodes.new("GeometryNodeSwitch")
+    zero_shell.input_type = "GEOMETRY"
+    links.new(has_thickness, zero_shell.inputs["Switch"])
+    links.new(projection, zero_shell.inputs["False"])
+    volume = build_volume_fields(group, rim)
     normal_weight = build_normal_weight(group, is_shell)
     normal = build_front_normal(group, normal_weight)
     front = build_front_fields(group, volume, normal, normal_weight)
@@ -324,12 +342,8 @@ def _build_depth_surface(group, geometry, controls):
     })
     oriented = build_shell_position(group, shell["position"], shell["front"], is_shell, fields)
     links.new(oriented, shell["position_input"])
-    amount = group.nodes.new("GeometryNodeSwitch")
-    amount.input_type = "FLOAT"
-    links.new(is_shell, amount.inputs["Switch"])
-    links.new(controls.outputs["Thickness"], amount.inputs["False"])
-    links.new(controls.outputs["Shell Thickness"], amount.inputs["True"])
-    return _remove_zero_thickness(group, projection, shell["geometry"], amount.outputs[0])
+    links.new(shell["geometry"], zero_shell.inputs["True"])
+    return zero_shell.outputs[0]
 
 
 def build_image_depth_cutout_group():
@@ -361,7 +375,7 @@ def build_image_depth_cutout_group():
     interface_socket(group, 'Depth Image', 'INPUT', 'NodeSocketImage', data).hide_in_modifier = True
     interface_socket(group, 'Geometry', 'OUTPUT', 'NodeSocketGeometry')
     controls = group_input(group.nodes, set())
-    geometry = store_float_attribute(group, controls.outputs['Geometry'], NORMAL_REDUCTION_ATTRIBUTE_NAME, 0.0, domain='FACE')
+    geometry = store_float_attribute(group, controls.outputs['Geometry'], NORMAL_REDUCTION_ATTRIBUTE_NAME, 0.0)
     geometry = _build_depth_surface(group, geometry, controls)
     _shade_output(group, geometry)
     prepare_node_group(group)

tools/nodes/groups/image_depth_panorama.py

@@ -7,9 +7,9 @@ import bpy
 from ..common.validity import delete_invalid_points
 
 from ..common.depth_surface import (
-    _math, split_depth_surface, build_surface_camera, CUT_ATTRIBUTE,
+    _math, split_depth_surface, build_surface_camera,
 )
-from ..common.nodes import float_input, group_input, interface_socket, prepare_node_group, evaluate_field, remove_attributes
+from ..common.nodes import float_input, group_input, interface_socket, prepare_node_group, evaluate_field, remove_attribute_pattern
 from ..common.material_slots import inherit_material_slots
 from ..common.boundary_smoothing import smooth_boundary_depth, smooth_cut_boundary
 
@@ -175,10 +175,7 @@ def build_image_depth_panorama_group():
     deform = nodes.new("GeometryNodeSetPosition")
     links.new(geometry, deform.inputs["Geometry"])
     links.new(radial.outputs[0], deform.inputs["Position"])
-    geometry = remove_attributes(
-        group, deform.outputs[0], CUT_ATTRIBUTE,
-        enabled=_math(group, "GREATER_THAN", strength, 0.0),
-    )
+    geometry = remove_attribute_pattern(group, deform.outputs[0], "_o_*")
     geometry = smooth_cut_boundary(group, geometry, cut_vertex, outline_scale=1.0)
     flip = nodes.new("GeometryNodeFlipFaces")
     links.new(geometry, flip.inputs["Mesh"])

tools/nodes/groups/image_depth_plane.py

@@ -130,7 +130,7 @@ def build_image_depth_plane_group(image_plane_group):
     surface = project_depth_surface(
         group, geometry, camera,
         scale_input.outputs["Uniform Scale"], depth_input.outputs["Reference Depth"],
-        depth_input.outputs["Depth Scale"], split_input.outputs["Depth Split"],
+        depth_input.outputs["Depth Scale"],
     )
     surface = smooth_cut_boundary(
         group, surface, cut_vertex, protected=original_boundary, outline_scale=1.0,