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AnyImage/openspec/changes/archive/2026-09-17-weight-cutout-boundary-smoothing/design.md
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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## Context
Depth Cutout 当前在 Split 后对全部实际边界使用同一两圈 influence 和同一 `Smooth Weight`。原始 Outline 需要保形,Split 形成的切边则需要更强平滑;两者可通过分裂前原始几何的轮廓字段区分。
## Goals / Non-Goals
**Goals:**
- 只保留一个 `Boundary Smooth` 次数输入。
- Split 边使用完整强度,Outline 使用固定 `0.1` 倍强度。
- 两类影响带相交时保留更强的 Split 平滑。
**Non-Goals:**
- 不增加独立的 Outline 或 Split 平滑参数。
- 不改变影响带宽度、整体 `Smooth Weight` 或普通 `Smooth` 的语义。
## Decisions
在 Split 前保留原始几何引用,并在当前投影几何上通过 `original_boundary_field()` 识别原始 Outline。分别构造 Outline 与 Split 边界字段及其两圈 influence:当前实际边界扣除 Outline 后作为 Split 边,Outline influence 乘 `0.1`,最终使用两者最大值。
两类边界继续进入同一个 Repeat Zone,共用 `Boundary Smooth` 次数和 `Smooth Weight`。相比串联两套平滑循环,这样不会增加公开参数,并保持节点数量与求值成本较低。交汇区域取最大值,使 Split 的完整强度优先。
`Boundary Smooth` 默认值改为 `4`,范围及零值旁路保持不变。
## Risks / Trade-offs
- Outline 每轮权重为 `0.1`,多次迭代后的累计位移不等于最终位移的 10% → 以行为测试验证它始终弱于相同设置下的 Split,并由默认 4 次控制累计程度。
- Split influence 向 Outline 邻域扩散时会在交点附近覆盖弱 Outline influence → 这是 Split 优先规则的预期结果,测试交汇区域输出有限且拓扑不变。