closed-surface-uv-coverage

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Ensure textures and decals cover all visible surfaces of a closed or extruded Blender asset, especially front/back caps and sidewalls, instead of relying on partial projected planes, curves, or linework overlays. Use when back textures do not fill the model, side textures are missing, spin/turntable views expose plain sidewalls, or a model needs separate UV treatment for caps and side surfaces.

2installs

Sourceroble3/cc-blender-skill

Added on2026-08-30

NPX Install

npx skill4agent add roble3/cc-blender-skill closed-surface-uv-coverage

SKILL.md Content

View Translation Comparison →

Closed Surface UV Coverage

This skill prevents a common false pass: a model looks textured from the front because it has a projected front image or curve overlays, but the closed surface has untextured back caps or plain sidewalls when viewed in a spin/turntable.

Failure modes to catch

Back detail is only a floating plane or curve overlay, not a material/UV on the back surface.
Sidewalls have procedural color only; no side UV island, generated/object coordinate material, or baked strip.
A back projection covers only a center shape and leaves the actual silhouette/back mesh plain.
Side/back QA uses front-biased frames and misses edge-on/back-on samples.
Decorative HUD/aura is mistaken for surface texture coverage.

Required surface taxonomy

For extruded/logo-like assets, classify visible surfaces before look-dev:

```
front_cap
```
— canonical front texture/decal.
```
back_cap
```
— back texture, back linework, or baked/procedural fill mapped to the real back cap.
```
sidewall
```
— depth surface connecting front/back, with its own UV parameterization or procedural material.
```
overlay_context
```
— HUD/aura/circles; never counted as model surface coverage.

Workflow

Audit current coverage: list mesh material slots, UV layers, image texture nodes, and face counts for front/back/side material indices.
Reject overlay-only fixes: curves/planes may add rim accents, but they do not satisfy back/side fill unless the mesh surface beneath is also textured/materialized.
Create per-surface UVs:
- front/back caps: project local X/Z to UV 0–1 or map into a back/front atlas rectangle;
- sidewall: map perimeter arc length to U and depth/front-back coordinate to V;
- if a clean side texture is unavailable, use a generated procedural side material plus baked glow/edge strip and document it.
Assign true surface materials: back cap and sidewall mesh faces must have material nodes, active UVs, and/or generated coordinates. Optional curves are accents only.
Validate turntable frames: sample front, 45°, side/edge-on, back-on, opposite 45°, and rest. Back and side frames must show surface fill, not just outlines.

Acceptance gates

Back cap mesh faces have either an image/procedural material with a declared UV/generated coordinate policy, not only separate curves.
Sidewall mesh faces have a sidewall material with UV/generated coordinates and visible depth treatment.
Overlay/context collections are excluded from coverage counts.
QA contact sheet includes back and edge-on frames.
A
```
surface_coverage_report.json
```
states which surfaces are image-textured, procedural, baked, or intentionally plain.

Handoff

Use after geometry is locked and before final material/look/animation acceptance. It complements

blender-uv-texturing

and

atlas-uv-fitting

: those skills explain UV/material setup; this skill enforces complete visible-surface coverage.

Script

```
scripts/surface_texture_coverage_audit.py
```
audits selected mesh objects for UV layers, material image nodes, face material counts, and overlay-only warning patterns.