Files
envi-code/SourceCode/Code2026/inc
company-desktop 9088c47bee feat: 通用 3D 缓存块存取(AecDbEntityCommon)+ 先挂在管件上
按"缓存挂在母体实体的 3dbuffer 上"的思路,把上一轮在 AecDbX3dPartEntity 里写的存取逻辑
提成通用能力:

- AecDbEntityCommon::Write3DBufferBlock() / Read3DBufferBlock():
  只能在最派生类的 dwgOut/dwgInFields 末尾调用;缓存里**全是 brep 才写**,
  有一个非 brep(中心线/箭头等)就整条不写(用户定的语义);
  读不到 magic / 校验失败 → 保持空缓存,照旧重建;不动版本号;内存 filer 不参与。
- AecDbEwFitting 上先挂了两个 hook(管件是全库 Add3DBuffer 用得最多的类,96 处)。
- 开关 AEC_3D_DWG_CACHE,默认关(=1 才写/读),Release 与正常存盘零影响。
- AEC_HAS_MODELER_FILER 对中望也打开(沿用上一轮的 cmake 改动)。

实测结论(big1.dwg,MOVE 弄脏 + REGENALL + QSAVE):
- 存盘后的 DWG 里 magic A3DB 出现 0 次 —— 一个块都没写出去;
- 同一次存盘里 EwPipe::RegionAcisout 3011 次,说明"弄脏+重序列化"这条路本身是通的。

原因(两堵墙互相顶):改过的实体在 AssertWriteEnabled 里就被清空了 3D 缓存
(而且 REGENALL 只重建视口可见的对象);没改过的实体增量存盘按字节拷贝、根本不调
dwgOutFields。所以"缓存有效"和"实体是脏的"在存盘那一刻基本不同时成立 ——
"塞进实体自己的流"这条路机制上不成立,不是值不值的问题。

分析写进 3d-cache-dwg-verdict.md §9,并给出唯一自洽的方向:缓存与实体序列化解耦
(隐藏块/字典里的 Xrecord 旁挂 + 命令结束/空闲时写入 + 按 handle 失效)。
这一版的两个函数就是那个方向的 modeler 存取基础,留着复用。
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