DCC production guide
Open Edge and Non-manifold Repair Checklist
Direct answer: Repair boundary and manifold issues by first deciding whether the opening is intentional. A bag strap, leaf card, or single-sided cloth panel may have open edges by design; a print mesh, collision volume, Boolean operand, or baked asset usually cannot. The fix is to classify the boundary, remove stray elements, close or rebuild the surface, then verify normals and maps after export.
Open EdgeNon-manifoldIsolated VertexOverlapping FacesFace Orientation开放边非流形面朝向
Find the real defect
Run an open-edge and non-manifold selection in the DCC tool, then isolate by object. Open edges are boundary edges with only one connected face. Non-manifold areas include edges shared by too many faces, internal faces, bow-tie vertices, duplicate shells, or self-intersections. Isolated vertices often come from deleted faces or messy scan cleanup and should be removed unless they are intentional control points.
When to close versus keep open
Close boundaries for watertight print meshes, collision proxies, signed-distance fields, voxelization, and surfaces that leak light or bake rays. Keep openings when the asset is a thin card, shell, cloth edge, stylized leaf, or a deliberately open prop, but document it so automated validation does not treat it as accidental damage.
Repair sequence
Delete duplicate faces and isolated vertices first. Merge coincident vertices only after checking UV seams and material boundaries. Bridge clean boundary loops, fill flat hidden holes cautiously, and rebuild curved visible areas with topology that follows the surrounding form. Recalculate face orientation after structural repair; flipping normals before cleanup can hide the source problem.
Bake and engine checks
After repair, inspect shaded mode, wireframe, UV layout, normal map bake, and engine import warnings. Overlapping faces may flicker from z-fighting even when the model appears closed. Wrong face orientation can make surfaces disappear under backface culling or bake black in the target renderer.
Worked example
A scanned stone arch has a visible crack and several floating triangles inside the scan volume. The crack can remain if it is a visible sculpted detail, but floating internal triangles and non-manifold intersections should be removed before decimation. After cleanup, compare the arch silhouette, run non-manifold selection again, and import it into the target scene to check shadows and collision.
Multilingual production terms
Use this open edge non manifold repair checklist terminology table when writing review comments, export notes, or handoff instructions across Chinese, English, and Japanese teams.
| 中文 | English | 日本語 | Workflow usage note |
|---|---|---|---|
| 开放边 | Open Edge | 開いたエッジ | Use these terms when describing boundary defects, manifold checks, face direction, and cleanup evidence. |
| 非流形 | Non-manifold | 非多様体 | Use these terms when describing boundary defects, manifold checks, face direction, and cleanup evidence. |
| 孤立顶点 | Isolated Vertex | 孤立頂点 | Use these terms when describing boundary defects, manifold checks, face direction, and cleanup evidence. |
| 重叠面 | Overlapping Faces | 重複面 | Use these terms when describing boundary defects, manifold checks, face direction, and cleanup evidence. |
| 面朝向 | Face Orientation | 面の向き | Use these terms when describing boundary defects, manifold checks, face direction, and cleanup evidence. |
Term notes
Related multilingual terms on this page are technical anchors, not one-to-one translations: Open Edge / Non-manifold / Isolated Vertex / Overlapping Faces / Face Orientation / 开放边 / 非流形 / 面朝向. Keep local-language notes beside the English production term when writing DCC tasks.
Related pages and next step
Open SEELE AI workspaceFAQ
Are all open edges bad?
No. Open edges are acceptable for intentional thin surfaces, but they are risky for printing, collision, Boolean operations, and some bake workflows.
What causes non-manifold geometry?
Common causes are internal faces, duplicated shells, edges shared by more than two faces, self-intersections, and careless scan cleanup.
Should I simply recalculate normals?
Only after geometry is repaired. Recalculating normals can improve display but will not remove overlapping faces or broken boundaries.
What evidence proves the repair?
Show before/after open-edge or non-manifold counts, shaded preview, wireframe, and target import or bake result.