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nan 076a8c90f1 Add specifications for two-times upscale and unified depth plane features

- Introduced the two-times upscale specification detailing requirements for unified output, fixed model presets, arbitrary dimensions, and consistent job behavior.
- Added scenarios for existing models, repeated upscale, and handling of alpha preservation.
- Created the unified depth plane specification outlining geometry modes, stable interface, and asset evaluation.
- Defined scenarios for mode switching, relief and camera preservation, and validation of delivered assets.

2026-09-17 17:19:05 +08:00

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clipboard-image-cache Specification

Purpose

TBD - created by archiving change unify-material-color-images. Update Purpose after archive.

Requirements

Requirement: Clipboard reuse requires an unchanged image

相同剪贴板输入 SHALL 仅复用当前像素、尺寸、颜色空间和 Alpha 模式均匹配缓存基线的有效 Image。缓存验证 SHALL 包括透明区域 RGB，并保持候选图像原有内容与状态。

Scenario: Repeated content remains unchanged

WHEN 相同剪贴板内容再次粘贴，缓存图像内容和设置未改变
THEN 系统 SHALL 复用该 Image

Scenario: Mask overwrites the cached image

WHEN Mask 修改了独占的剪贴板 Image，修改结果已打包，再次粘贴原始剪贴板内容
THEN 系统 SHALL 加载原始剪贴板内容到另一 Image，保留已编辑图像

Scenario: Shared edit leaves an intact candidate

WHEN 编辑产生独立结果，另一个用户仍引用未修改的剪贴板原图
THEN 再次粘贴 SHALL 复用该未修改原图

Scenario: Other editing or interpretation changes invalidate a candidate

WHEN 候选图像经过尺寸修改、原生绘制、透明 RGB 修改、颜色空间或 Alpha 模式变更
THEN 再次粘贴 SHALL 跳过已变更候选，使用原始剪贴板内容及其初始解释设置

Scenario: Legacy or unreadable cache entry is found

WHEN 候选缺少内容校验基线或无法读取
THEN 系统 SHALL 按未命中处理，并保留已有图像

Requirement: Clipboard material results stay outside the source cache

剪贴板 Plane SHALL 从有效剪贴板原图按整图范围生成独立材质颜色图。参考图、节点和笔刷的后续粘贴 SHALL 按原图缓存有效性选择 Image。

Scenario: Painted material is followed by another paste

WHEN 用户粘贴为 Plane 并绘制其材质，随后把相同内容粘贴为参考图、节点或笔刷
THEN 系统 SHALL 使用原始剪贴板内容，且不复用材质颜色图

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