From 463cb06be4c5e4cfb27ecbd2d8fa1d8f2a1a2f9c Mon Sep 17 00:00:00 2001
From: que01 <que01@foxmail.com>
Date: Tue, 4 Aug 2026 12:28:43 +0800
Subject: [PATCH] Add configurable area asset budgets

---
 .trellis/spec/config/index.md                 | 22 ++++++-
 .trellis/spec/pipeline/cli-and-stages.md      |  5 +-
 .../08-04-add-area-asset-budgets/check.jsonl  |  1 +
 .../08-04-add-area-asset-budgets/design.md    | 39 +++++++++++
 .../implement.jsonl                           |  1 +
 .../08-04-add-area-asset-budgets/implement.md | 24 +++++++
 .../tasks/08-04-add-area-asset-budgets/prd.md | 59 +++++++++++++++++
 .../08-04-add-area-asset-budgets/task.json    | 26 ++++++++
 README.md                                     | 14 +++-
 config/examples/template.json                 |  8 +++
 docs/changelog.md                             |  4 ++
 package.json                                  |  3 +-
 scripts/build-area.js                         |  7 +-
 scripts/glb-digest.js                         | 66 +++++++++++++++++--
 scripts/lib/area-config.js                    | 42 ++++++++++++
 scripts/lib/area-diagnostics.js               | 61 +++++++++++------
 scripts/lib/stage-manifest.js                 | 45 +++++++++----
 scripts/test-asset-budgets.js                 | 58 ++++++++++++++++
 18 files changed, 443 insertions(+), 42 deletions(-)
 create mode 100644 .trellis/tasks/08-04-add-area-asset-budgets/check.jsonl
 create mode 100644 .trellis/tasks/08-04-add-area-asset-budgets/design.md
 create mode 100644 .trellis/tasks/08-04-add-area-asset-budgets/implement.jsonl
 create mode 100644 .trellis/tasks/08-04-add-area-asset-budgets/implement.md
 create mode 100644 .trellis/tasks/08-04-add-area-asset-budgets/prd.md
 create mode 100644 .trellis/tasks/08-04-add-area-asset-budgets/task.json
 create mode 100644 scripts/test-asset-budgets.js

diff --git a/.trellis/spec/config/index.md b/.trellis/spec/config/index.md
index 445799c..7b77957 100644
--- a/.trellis/spec/config/index.md
+++ b/.trellis/spec/config/index.md
@@ -54,6 +54,7 @@ cp config/examples/template.json config/areas/my-area.json
 | `osm2streets` | | 见下 | 透传给 osm2streets 的选项 |
 | `blender` | | 见下 | Blender 侧选项 |
 | `compress` | | 见下 | 显式 `compress` 阶段的 GLB 压缩选项 |
+| `budget` | | 见下 | 区域 GLB 性能与体量预算 |
 | `outputs` | | 从 `id` 推导 | 输出路径覆盖，逃生舱 |
 
 **路径一律绝对**。`normalizeAreaConfig` 对每一项都做 `path.resolve`，相对路径会
@@ -132,6 +133,23 @@ cp config/examples/template.json config/areas/my-area.json
 | `effort` | `80` | WebP 编码 effort，范围 `0..100` |
 | `meshopt` | `false` | 是否追加 `EXT_meshopt_compression`。开启前要单独验证 Cesium 兼容性 |
 
+### `budget`
+
+`budget` 是 `diagnose:area`、`check:area` 和 Cesium / compress manifest 共用的 GLB
+限制。未配置时采用全局默认；用户字段统一用 MB 或整数，归一化后内部使用 bytes / counts：
+
+| 字段 | 默认 | 说明 |
+|---|---:|---|
+| `glbSizeMb` | `25` | GLB 文件总大小（MB） |
+| `nodes` | `1000` | GLB node 数量 |
+| `images` | `24` | GLB image 数量 |
+| `triangles` | `250000` | node 实例化后的 render triangles，不是唯一 mesh 的静态 triangles |
+| `embeddedImageBytesMb` | `20` | GLB 内嵌图片字节（MB） |
+| `reason` | `""` | 任一值高于默认时必填，记录区域例外原因 |
+
+所有数值必须为正数，`nodes` / `images` / `triangles` 必须为正整数。收紧任何默认值不需要
+`reason`；放宽任一默认值而没有非空 `reason` 会在配置归一化时失败。
+
 ### `outputs`（逃生舱）
 
 默认全部从 `id` 推导为 `<outputRoot>/<id>/<fileStem>.<ext>`。需要定制时逐项覆盖：
@@ -165,7 +183,9 @@ cp config/examples/template.json config/areas/my-area.json
 3. 若要传给低层脚本，加进 `writeDerivedConfig` 的 `derivedConfig` 对象
 4. 若是数值，在消费侧加 `Number.isFinite` + 范围校验，**在任何副作用之前**
 5. 更新 `config/examples/template.json`
-6. 更新本文档的字段表
+6. 若字段影响区域质量门，确认 `diagnose:area`、`check:area` 和 stage manifest 共用同一
+   个评估 helper，不能在入口脚本各自比较阈值
+7. 更新本文档的字段表
 
 若新字段产出新文件，同时在 `outputs` 里加一行路径推导。
 
diff --git a/.trellis/spec/pipeline/cli-and-stages.md b/.trellis/spec/pipeline/cli-and-stages.md
index 5a7ba25..3c0d8fe 100644
--- a/.trellis/spec/pipeline/cli-and-stages.md
+++ b/.trellis/spec/pipeline/cli-and-stages.md
@@ -323,6 +323,7 @@ node scripts/check-area.js [--config config/areas/<area>.json]
 | Cesium GLB / metadata / preview 缺失或类型错误 | failure |
 | metadata JSON 损坏 | failure |
 | GLB size / nodes / images 超保守预算 | failure |
+| GLB render triangles / embedded image bytes 超保守预算 | failure |
 | expected stage manifest 缺失、损坏或 stale | failure |
 | stage manifest warning 内容包含 budget exceeded | failure |
 | QGIS preview 缺失 | warning，不阻断 |
@@ -481,6 +482,7 @@ File records use this shape:
 - `summary.glb.fileBytes`
 - `summary.glb.counts`
 - `summary.glb.extensionsUsed`
+- `summary.budget`：effective limits、usage 和 violations；warnings 来自同一个预算评估
 
 `cesium` 会调用 preview 生成函数，但 preview HTML / route / vehicle model 的 freshness
 所有权属于独立 `preview` manifest。否则单跑 `--stages preview` 会把 Cesium manifest
@@ -512,6 +514,7 @@ File records use this shape:
 - `summary.options`
 - `summary.compressionRatio`
 - `summary.savedBytes`
+- `summary.budget`：压缩 GLB 的 effective limits、usage 和 violations
 
 Manifest files are written atomically via `*.tmp` then `renameSync`.
 
@@ -524,7 +527,7 @@ Manifest files are written atomically via `*.tmp` then `renameSync`.
 | Manifest output 文件缺失 | 写入时抛错；诊断时报告 stale/missing |
 | Manifest JSON 无法解析 | 诊断报告 invalid warning |
 | Manifest 记录的 input / output sha/bytes 与当前文件不同 | 诊断报告 stale warning |
-| GLB size / nodes / images 超保守预算 | manifest `warnings[]` 记录，诊断继续独立报警 |
+| GLB size / nodes / images / render triangles / embedded image bytes 超保守预算 | manifest `warnings[]` 记录，诊断继续独立报警 |
 | `intermediates` 后留有旧 reimport manifest | 成功后删除旧 reimport manifest |
 | `reimport` 后留有旧 intermediates manifest | 成功后删除旧 intermediates manifest |
 
diff --git a/.trellis/tasks/08-04-add-area-asset-budgets/check.jsonl b/.trellis/tasks/08-04-add-area-asset-budgets/check.jsonl
new file mode 100644
index 0000000..9dd3234
--- /dev/null
+++ b/.trellis/tasks/08-04-add-area-asset-budgets/check.jsonl
@@ -0,0 +1 @@
+{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}
diff --git a/.trellis/tasks/08-04-add-area-asset-budgets/design.md b/.trellis/tasks/08-04-add-area-asset-budgets/design.md
new file mode 100644
index 0000000..a1f825e
--- /dev/null
+++ b/.trellis/tasks/08-04-add-area-asset-budgets/design.md
@@ -0,0 +1,39 @@
+# Area asset budgets design
+
+## Boundaries
+
+`scripts/lib/area-config.js` 归一化配置的 `budget`。`scripts/glb-digest.js` 承担 GLB
+结构统计和 source/image 摘要；`scripts/lib/stage-manifest.js` 承担默认预算、覆盖合并、
+判定和 warning 文本。`scripts/lib/area-diagnostics.js` 只消费这两个共享事实源，并向
+diagnose/check 报告结果。
+
+## Data Flow
+
+```text
+config budget + global defaults
+        -> normalizeAreaConfig()
+GLB JSON -> digest() -> usage + source/image summaries
+        -> evaluateGlbBudget(digest, area.budget)
+        -> stage manifest summary/warnings
+        -> diagnose report / check failures
+```
+
+预算字段面向用户使用 `glbSizeMb`，内部归一化为 bytes；其余计数为整数。有效预算对象应始终
+完整，避免 consumers 自己回退默认值。
+
+## Attribution
+
+`digest()` 将每个 node 的 mesh primitives 转为 triangles，并按有限、稳定的名称规则分组
+（building、foliage、roads、water、fountain、other）。同一 mesh 被多个 node 引用时，source
+summary 统计实例化后的渲染 triangles；它用于帧渲染复杂度而非 GLB 静态字节。图片条目从
+`bufferViews[image.bufferView].byteLength` 读取 embedded bytes，并按 bytes 排序。
+
+## Compatibility
+
+没有 `budget` 的区域仍使用当前全局 25 MB / 1000 nodes / 24 images，并增加 triangles 和
+embedded image bytes 的默认阈值。旧 stage manifest 可被读取；新字段只在后续 Cesium / compress
+阶段写入。现有 `check:area` 保持超预算失败。
+
+## Rollback
+
+移除配置归一化、预算评估和扩展摘要即可回退到固定三项预算；旧 manifest 中的附加字段可忽略。
diff --git a/.trellis/tasks/08-04-add-area-asset-budgets/implement.jsonl b/.trellis/tasks/08-04-add-area-asset-budgets/implement.jsonl
new file mode 100644
index 0000000..9dd3234
--- /dev/null
+++ b/.trellis/tasks/08-04-add-area-asset-budgets/implement.jsonl
@@ -0,0 +1 @@
+{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}
diff --git a/.trellis/tasks/08-04-add-area-asset-budgets/implement.md b/.trellis/tasks/08-04-add-area-asset-budgets/implement.md
new file mode 100644
index 0000000..56ab1bd
--- /dev/null
+++ b/.trellis/tasks/08-04-add-area-asset-budgets/implement.md
@@ -0,0 +1,24 @@
+# Area asset budgets implementation plan
+
+1. 扩展 GLB digest 的 triangles、embedded image bytes、image/source summaries，并添加纯 Node
+   fixture 测试。
+2. 在 area config 归一化 `budget`，实现全局默认、数值范围与放宽例外原因校验；更新模板。
+3. 在 stage-manifest 提供单一预算评估函数，并接入 Cesium/compress manifest 写入。
+4. 让 area diagnostics 与质量门复用预算评估，改进 text report。
+5. 添加临时配置或 mock digest 测试，证明超标阻断、放宽无理由拒绝和收紧允许。
+6. 更新文档/spec/changelog，运行只针对南台子的验证。
+
+## Validation
+
+```bash
+node --check scripts/glb-digest.js
+node --check scripts/lib/area-config.js
+node --check scripts/lib/stage-manifest.js
+node --check scripts/lib/area-diagnostics.js
+npm run test:preflight
+npm run diagnose:area -- --config config/areas/nantaizi-lake-innovation-valley.json
+npm run check:area -- --config config/areas/nantaizi-lake-innovation-valley.json
+git diff --check
+```
+
+不跑 Blender/QGIS/Cesium，除非现有 manifest 的 schema 验证无法在纯 Node 层覆盖。
diff --git a/.trellis/tasks/08-04-add-area-asset-budgets/prd.md b/.trellis/tasks/08-04-add-area-asset-budgets/prd.md
new file mode 100644
index 0000000..ebcbc99
--- /dev/null
+++ b/.trellis/tasks/08-04-add-area-asset-budgets/prd.md
@@ -0,0 +1,59 @@
+# Add area asset budgets
+
+## Goal
+
+让区域 GLB 的性能和体量约束成为可配置、可追踪、可定位的契约。手工改 OSM、资产或场景
+生成逻辑后，使用者应能知道是否超出预算，以及节点、三角面和贴图主要来自哪一类资产。
+
+## Confirmed Facts
+
+- 原有全局保守阈值为 25 MB、1000 nodes、24 images；本任务将它扩展为统一预算评估，并
+  新增 250k render triangles 与 20 MB embedded image bytes。
+- `scripts/glb-digest.js` 已可无依赖读取 GLB JSON chunk，且提供 node、mesh、material、
+  image、accessor 和 primitive vertex/index 计数。图片可通过 image 的 `bufferView` 计算嵌入
+  字节；三角面可由 primitive index count 计算。
+- 现有南台子基线为 21.37 MB、933 nodes、117 meshes、18 images，当前未超固定预算。
+- GLB node/mesh 命名已经包含可用来源线索，如 `Building_*`、`Shapespark_*` 与道路/植被
+  资产名；可用于诊断“渲染实例和三角面”来源，但不能把交织二进制 buffer 的静态文件字节精确
+  分配给单一节点。
+- `check:area` 已将超预算作为 failure；新增策略必须保持这个默认阻断方向。
+
+## Requirements
+
+1. 区域配置新增可选 `budget` 对象，可覆盖全局默认的 GLB size、nodes、images、triangles
+   和 embedded image bytes 限额；未配置时保持现有默认约束，并为新增指标提供保守默认值。
+2. 任何比全局默认更宽松的区域覆盖必须提供非空 `budget.reason`，使例外可审计；更严格覆盖
+   不需要理由。
+3. 扩展共享 GLB digest，提供总 triangles、embedded image bytes，以及按稳定 node-name 分类的
+   source summary（节点数、mesh instances、triangles）。不虚构无法可靠归因的“每类文件字节”。
+4. `diagnose:area` 显示实际值、有效预算、超标项，以及 top source / top embedded images。
+5. `check:area` 复用相同预算计算，将任何超标项作为 failure；不在入口脚本复制阈值或 GLB
+   解析逻辑。
+6. Cesium/compress stage manifest 写入其对应 GLB 的 budget、usage 和 budget warnings，供
+   之后检查 stale 或回溯。
+7. 更新区域配置模板、README、pipeline/config specs 和 changelog；只验证南台子。
+
+## Acceptance Criteria
+
+- [x] `normalizeAreaConfig()` 对合法 budget 覆盖归一化，对负数、非数值或放宽默认值但缺
+      `reason` 的配置明确报错。
+- [x] 南台子 diagnostics 显示有效预算、总 triangles、embedded image bytes、source summary
+      与 top images，且当前默认 GLB 仍通过质量门。
+- [x] 临时配置/fixture 将任一预算压低后，`check:area` 以非零退出并指出实际值和阈值。
+- [x] stage manifest 包含和当前 GLB digest 对应的 budget/usage/warnings；不重跑 Blender 或
+      Cesium 也可通过独立逻辑测试验证 payload。
+- [x] 对 GLB digest 的新统计和预算分类有纯 Node 回归测试。
+- [x] Node 语法检查、相关测试和 `git diff --check` 通过。
+
+## Out Of Scope
+
+- 不自动压缩、删减或替换资产；预算只报告和阻断。
+- 不改变默认 GLB、Cesium preview 或 Blender 的视觉结果。
+- 不尝试对共享/交织 GLB buffer 做不可靠的按节点文件字节归因。
+- 不验证 `hanyang-block`。
+
+## Key Decisions
+
+- 默认预算仍是阻断性质量门；区域只可通过显式配置覆盖。
+- 放宽全局默认的例外必须在配置中写明原因；收紧预算不需理由。
+- 归因以准确的节点实例/三角面和嵌入图片字节为准，不把静态 GLB 总字节伪分配给资产类别。
diff --git a/.trellis/tasks/08-04-add-area-asset-budgets/task.json b/.trellis/tasks/08-04-add-area-asset-budgets/task.json
new file mode 100644
index 0000000..64b3d6e
--- /dev/null
+++ b/.trellis/tasks/08-04-add-area-asset-budgets/task.json
@@ -0,0 +1,26 @@
+{
+  "id": "add-area-asset-budgets",
+  "name": "add-area-asset-budgets",
+  "title": "Add area asset budgets",
+  "description": "Make GLB asset budgets configurable, visible in diagnostics, and enforceable by check:area.",
+  "status": "in_progress",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "dingkang",
+  "assignee": "dingkang",
+  "createdAt": "2026-08-04",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index d487007..f2701dd 100644
--- a/README.md
+++ b/README.md
@@ -120,9 +120,21 @@ npm run check:area -- --config config/areas/nantaizi-lake-innovation-valley.json
 `check:area` 复用 `diagnose:area` 的 OSM、产物、metadata、GLB digest 和 stage manifest
 检查，但输出更短的 PASS/FAIL 报告。它不会启动 QGIS、Blender、Cesium、压缩或任何重建阶段。
 
+GLB 预算默认阻断 size、nodes、images、实例化后的 render triangles 和嵌入贴图字节。
+`diagnose:area` 会显示有效预算、top source 和最大贴图。区域可在配置中收紧预算；要放宽
+默认值，必须写明原因：
+
+```json
+"budget": {
+  "nodes": 1400,
+  "triangles": 350000,
+  "reason": "Dense campus vegetation approved for this area"
+}
+```
+
 第一版会在这些条件下退出非零：OSM bounds 缺失/无效、building multipolygon relation
 异常、建筑 `height` 无法按正数米解析、Cesium GLB / metadata / preview 缺失或类型错误、
-metadata JSON 损坏、GLB size / nodes / images 超过保守预算、期望存在的 stage manifest
+metadata JSON 损坏、GLB size / nodes / images / render triangles / embedded image bytes 超过保守预算、期望存在的 stage manifest
 缺失/损坏/stale。缺 QGIS preview 目前只作为 warning，不阻断。
 
 ## 区域配置
diff --git a/config/examples/template.json b/config/examples/template.json
index 271b22c..20d5a1d 100644
--- a/config/examples/template.json
+++ b/config/examples/template.json
@@ -37,5 +37,13 @@
     "quality": 82,
     "effort": 80,
     "meshopt": false
+  },
+  "budget": {
+    "glbSizeMb": 25,
+    "nodes": 1000,
+    "images": 24,
+    "triangles": 250000,
+    "embeddedImageBytesMb": 20,
+    "reason": ""
   }
 }
diff --git a/docs/changelog.md b/docs/changelog.md
index ec68f9b..d2ab879 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -2,6 +2,10 @@
 
 ## 2026-08-04
 
+- GLB 预算现在由区域配置契约化：`budget.glbSizeMb`、`nodes`、`images`、`triangles` 和
+  `embeddedImageBytesMb` 可覆盖默认限制；任何放宽必须有 `budget.reason`。共享 digest 新增
+  静态/实例化 render triangles、嵌入贴图字节、节点来源和最大贴图摘要，`diagnose:area`、
+  `check:area` 与 Cesium/compress manifest 复用同一预算评估，避免阈值漂移。
 - 新增 `npm run preflight:area -- --config config/areas/<area>.json`：手工编辑 OSM 后可在
   QGIS / Blender / Cesium 前检查 bounds、缺失 node、building way 闭合性、building
   multipolygon member/ring 与显式高度。结构错误会非零退出；成功结果原子写入
diff --git a/package.json b/package.json
index 130841e..0cd0380 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "compress:glb": "node scripts/compress-glb.js",
     "diagnose:area": "node scripts/diagnose-area.js",
     "preflight:area": "node scripts/preflight-area.js",
-    "test:preflight": "node scripts/test-area-preflight.js"
+    "test:preflight": "node scripts/test-area-preflight.js",
+    "test:budgets": "node scripts/test-asset-budgets.js"
   },
   "dependencies": {
     "osm2streets-js-node": "0.1.4"
diff --git a/scripts/build-area.js b/scripts/build-area.js
index 51f9d0f..a5dbda6 100755
--- a/scripts/build-area.js
+++ b/scripts/build-area.js
@@ -13,6 +13,7 @@ const {
 const { digest: glbDigest } = require("./glb-digest");
 const {
   fileRecord,
+  evaluateGlbBudget,
   glbBudgetWarnings,
   glbSummary,
   optionalFileRecord,
@@ -334,8 +335,9 @@ function exportCesium(area) {
     },
     summary: {
       glb: glbSummary(digest),
+      budget: evaluateGlbBudget(digest, area.budget),
     },
-    warnings: glbBudgetWarnings("Cesium", digest),
+    warnings: glbBudgetWarnings("Cesium", digest, area.budget),
   });
 }
 
@@ -400,6 +402,7 @@ function compressCesiumGlb(area) {
     summary: {
       sourceGlb: glbSummary(sourceDigest),
       compressedGlb: glbSummary(compressedDigest),
+      budget: evaluateGlbBudget(compressedDigest, area.budget),
       options: {
         textureSize: area.compress.textureSize,
         quality: area.compress.quality,
@@ -409,7 +412,7 @@ function compressCesiumGlb(area) {
       compressionRatio: Number((compressedDigest.fileBytes / sourceDigest.fileBytes).toFixed(4)),
       savedBytes: sourceDigest.fileBytes - compressedDigest.fileBytes,
     },
-    warnings: glbBudgetWarnings("Compressed", compressedDigest),
+    warnings: glbBudgetWarnings("Compressed", compressedDigest, area.budget),
   });
 }
 
diff --git a/scripts/glb-digest.js b/scripts/glb-digest.js
index b1451ff..d64fd00 100644
--- a/scripts/glb-digest.js
+++ b/scripts/glb-digest.js
@@ -59,6 +59,10 @@ function materialDigest(material) {
 
 function digest(file) {
   const gltf = readGlbJson(file);
+  return digestGltf(gltf, { file: path.basename(file), fileBytes: fs.statSync(file).size });
+}
+
+function digestGltf(gltf, fileInfo = {}) {
   const meshes = (gltf.meshes || []).map((mesh) => ({
     name: mesh.name || null,
     primitives: (mesh.primitives || []).map((primitive) => ({
@@ -68,18 +72,37 @@ function digest(file) {
       // fingerprint and stay stable regardless of buffer layout.
       count: gltf.accessors?.[primitive.attributes?.POSITION]?.count ?? null,
       indices: gltf.accessors?.[primitive.indices]?.count ?? null,
+      triangles: primitiveTriangleCount(primitive, gltf.accessors || []),
     })),
   }));
+  const sourceSummary = summarizeNodeSources(gltf.nodes || [], meshes);
+  const images = (gltf.images || [])
+    .map((image) => ({
+      name: image.name || null,
+      mimeType: image.mimeType || null,
+      bytes: gltf.bufferViews?.[image.bufferView]?.byteLength ?? 0,
+    }))
+    .sort((a, b) => b.bytes - a.bytes || String(a.name).localeCompare(String(b.name)));
+  const triangles = meshes.reduce(
+    (total, mesh) => total + mesh.primitives.reduce((sum, primitive) => sum + primitive.triangles, 0),
+    0,
+  );
+  const renderTriangles = sourceSummary.reduce((total, source) => total + source.triangles, 0);
+  const embeddedImageBytes = images.reduce((total, image) => total + image.bytes, 0);
   return {
-    file: path.basename(file),
-    fileBytes: fs.statSync(file).size,
+    file: fileInfo.file || null,
+    fileBytes: fileInfo.fileBytes ?? 0,
     counts: {
       nodes: (gltf.nodes || []).length,
       meshes: meshes.length,
       materials: (gltf.materials || []).length,
       images: (gltf.images || []).length,
       accessors: (gltf.accessors || []).length,
+      triangles,
+      renderTriangles,
     },
+    embeddedImageBytes,
+    sourceSummary,
     extensionsUsed: (gltf.extensionsUsed || []).slice().sort(),
     buffers: (gltf.buffers || []).map((buffer) => buffer.byteLength),
     nodes: (gltf.nodes || [])
@@ -96,12 +119,44 @@ function digest(file) {
     materials: (gltf.materials || [])
       .map(materialDigest)
       .sort((a, b) => String(a.name).localeCompare(String(b.name))),
-    images: (gltf.images || [])
-      .map((image) => ({ name: image.name || null, mimeType: image.mimeType || null }))
-      .sort((a, b) => String(a.name).localeCompare(String(b.name))),
+    images,
   };
 }
 
+function primitiveTriangleCount(primitive, accessors) {
+  if (primitive.mode !== undefined && primitive.mode !== 4) return 0;
+  const count = primitive.indices === undefined
+    ? accessors[primitive.attributes?.POSITION]?.count
+    : accessors[primitive.indices]?.count;
+  return Number.isFinite(count) ? Math.floor(count / 3) : 0;
+}
+
+function summarizeNodeSources(nodes, meshes) {
+  const summaries = new Map();
+  for (const node of nodes) {
+    if (node.mesh === undefined || !meshes[node.mesh]) continue;
+    const source = nodeSource(node.name || meshes[node.mesh].name || "");
+    const summary = summaries.get(source) || { source, nodes: 0, meshInstances: 0, triangles: 0 };
+    const triangles = meshes[node.mesh].primitives.reduce((sum, primitive) => sum + primitive.triangles, 0);
+    summary.nodes += 1;
+    summary.meshInstances += 1;
+    summary.triangles += triangles;
+    summaries.set(source, summary);
+  }
+  return [...summaries.values()].sort((a, b) => b.triangles - a.triangles || a.source.localeCompare(b.source));
+}
+
+function nodeSource(name) {
+  const value = String(name).toLowerCase();
+  if (value.includes("building")) return "buildings";
+  if (/(shapespark|tree|bush|shrub|grass|branch|trunk|leaf)/.test(value)) return "vegetation";
+  if (/(road|sidewalk|lane|crosswalk|stop|intersection)/.test(value)) return "roads";
+  if (/(lake|water)/.test(value)) return "water";
+  if (value.includes("fountain")) return "fountain";
+  if (/(vehicle|car)/.test(value)) return "vehicles";
+  return "other";
+}
+
 function main() {
   const argv = process.argv.slice(2);
   const file = argv.find((arg) => !arg.startsWith("--"));
@@ -128,5 +183,6 @@ if (require.main === module) {
 
 module.exports = {
   digest,
+  digestGltf,
   readGlbJson,
 };
diff --git a/scripts/lib/area-config.js b/scripts/lib/area-config.js
index 04dfc16..95adcf4 100644
--- a/scripts/lib/area-config.js
+++ b/scripts/lib/area-config.js
@@ -2,6 +2,7 @@
 
 const fs = require("fs");
 const path = require("path");
+const { BUDGETS } = require("./stage-manifest");
 
 function readAreaConfig(file, options = {}) {
   if (!fs.existsSync(file)) {
@@ -23,6 +24,7 @@ function normalizeAreaConfig(raw, options = {}) {
   const areaDir = path.resolve(outputOverrides.areaDir || path.join(outputRoot, id));
   const fileStem = outputOverrides.fileStem || id;
   const compress = normalizeCompressConfig(raw.compress);
+  const budget = normalizeBudgetConfig(raw.budget);
   const compressedFileStem = outputOverrides.compressedFileStem ||
     `${fileStem}-compressed-webp${compress.textureSize}${compress.meshopt ? "-meshopt" : ""}`;
   const pipelineDir = path.resolve(outputOverrides.pipelineDir || path.join(areaDir, "_pipeline"));
@@ -92,10 +94,34 @@ function normalizeAreaConfig(raw, options = {}) {
       officeOverrides: raw.blender?.officeOverrides || raw.blender?.office_overrides || "",
     },
     compress,
+    budget,
     outputs,
   };
 }
 
+function normalizeBudgetConfig(raw) {
+  if (raw !== undefined && raw !== null && (typeof raw !== "object" || Array.isArray(raw))) {
+    throw new Error("budget must be an object");
+  }
+  const value = raw || {};
+  const budget = {
+    glbBytes: megabytesOption(value.glbSizeMb, BUDGETS.glbBytes, "budget.glbSizeMb"),
+    glbNodes: integerOption(value.nodes, BUDGETS.glbNodes, "budget.nodes"),
+    glbImages: integerOption(value.images, BUDGETS.glbImages, "budget.images"),
+    glbTriangles: integerOption(value.triangles, BUDGETS.glbTriangles, "budget.triangles"),
+    glbImageBytes: megabytesOption(value.embeddedImageBytesMb, BUDGETS.glbImageBytes, "budget.embeddedImageBytesMb"),
+    reason: value.reason ?? "",
+  };
+  if (typeof budget.reason !== "string") {
+    throw new Error("budget.reason must be a string");
+  }
+  const loosened = Object.keys(BUDGETS).some((key) => budget[key] > BUDGETS[key]);
+  if (loosened && budget.reason.trim() === "") {
+    throw new Error("budget.reason is required when a budget exceeds the default");
+  }
+  return budget;
+}
+
 function requireText(value, key) {
   if (typeof value !== "string" || value.trim() === "") {
     throw new Error(`Missing config key: ${key}`);
@@ -121,6 +147,22 @@ function numberOption(value, fallback, label, min, max) {
   return number;
 }
 
+function integerOption(value, fallback, label) {
+  const number = value === undefined ? fallback : Number(value);
+  if (!Number.isInteger(number) || number < 1) {
+    throw new Error(`${label} must be a positive integer`);
+  }
+  return number;
+}
+
+function megabytesOption(value, fallbackBytes, label) {
+  const megabytes = value === undefined ? fallbackBytes / 1024 / 1024 : Number(value);
+  if (!Number.isFinite(megabytes) || megabytes <= 0) {
+    throw new Error(`${label} must be a positive finite number`);
+  }
+  return Math.round(megabytes * 1024 * 1024);
+}
+
 function booleanOption(value, fallback, label) {
   if (value === undefined) return fallback;
   if (typeof value === "boolean") return value;
diff --git a/scripts/lib/area-diagnostics.js b/scripts/lib/area-diagnostics.js
index f818d99..b3a8fd5 100644
--- a/scripts/lib/area-diagnostics.js
+++ b/scripts/lib/area-diagnostics.js
@@ -10,7 +10,14 @@ const {
   layerFile,
 } = require("./scene-layers");
 const { digest: glbDigest } = require("../glb-digest");
-const { BUDGETS, fileRecord, readStageManifest, stageManifestPath } = require("./stage-manifest");
+const {
+  BUDGETS,
+  evaluateGlbBudget,
+  fileRecord,
+  glbBudgetWarnings,
+  readStageManifest,
+  stageManifestPath,
+} = require("./stage-manifest");
 
 function defaultConfigPath(repoRoot) {
   return path.join(repoRoot, "config", "areas", "nantaizi-lake-innovation-valley.json");
@@ -604,15 +611,7 @@ function collectWarnings(area, osm, artifacts, manifests, glb, metadata) {
     }
   }
   if (glb) {
-    if (glb.fileBytes > BUDGETS.glbBytes) {
-      warnings.push(`GLB size ${mb(glb.fileBytes)} MB exceeds budget ${mb(BUDGETS.glbBytes)} MB.`);
-    }
-    if (glb.counts.nodes > BUDGETS.glbNodes) {
-      warnings.push(`GLB nodes ${glb.counts.nodes} exceed budget ${BUDGETS.glbNodes}.`);
-    }
-    if (glb.counts.images > BUDGETS.glbImages) {
-      warnings.push(`GLB images ${glb.counts.images} exceed budget ${BUDGETS.glbImages}.`);
-    }
+    warnings.push(...glbBudgetWarnings("GLB", glb, area.budget).map((warning) => `${warning}.`));
   }
   if (metadata && metadata.assets < 1) {
     warnings.push("Cesium metadata has no assets entries.");
@@ -707,6 +706,9 @@ function printDiagnosticsReport(result) {
       `${glb.counts.materials} materials, ${glb.counts.images} images, ${glb.counts.accessors} accessors`,
     );
     console.log(`  Extensions: ${glb.extensionsUsed.length ? glb.extensionsUsed.join(", ") : "none"}`);
+    printGlbBudget(glb, area.budget);
+    printGlbSources(glb);
+    printGlbImages(glb);
   }
   console.log("");
 
@@ -789,15 +791,7 @@ function classifyAreaQuality(result) {
   }
 
   if (glb) {
-    if (glb.fileBytes > BUDGETS.glbBytes) {
-      failures.push(`GLB size ${mb(glb.fileBytes)} MB exceeds budget ${mb(BUDGETS.glbBytes)} MB.`);
-    }
-    if (glb.counts.nodes > BUDGETS.glbNodes) {
-      failures.push(`GLB nodes ${glb.counts.nodes} exceed budget ${BUDGETS.glbNodes}.`);
-    }
-    if (glb.counts.images > BUDGETS.glbImages) {
-      failures.push(`GLB images ${glb.counts.images} exceed budget ${BUDGETS.glbImages}.`);
-    }
+    failures.push(...glbBudgetWarnings("GLB", glb, result.area.budget).map((warning) => `${warning}.`));
   }
 
   if (!result.area.blender.treeStyle) {
@@ -832,6 +826,35 @@ function formatBytes(bytes) {
   return `${bytes} B`;
 }
 
+function printGlbBudget(glb, budget) {
+  const result = evaluateGlbBudget(glb, budget);
+  console.log("  Budget:");
+  console.log(`    Size: ${formatBytes(result.usage.glbBytes)} / ${formatBytes(result.limits.glbBytes)}`);
+  console.log(`    Nodes: ${result.usage.glbNodes} / ${result.limits.glbNodes}`);
+  console.log(`    Images: ${result.usage.glbImages} / ${result.limits.glbImages}`);
+  console.log(`    Render triangles: ${result.usage.glbTriangles} / ${result.limits.glbTriangles}`);
+  console.log(`    Embedded images: ${formatBytes(result.usage.glbImageBytes)} / ${formatBytes(result.limits.glbImageBytes)}`);
+  if (budget.reason) console.log(`    Exception: ${budget.reason}`);
+}
+
+function printGlbSources(glb) {
+  const sources = (glb.sourceSummary || []).slice(0, 5);
+  if (!sources.length) return;
+  console.log("  Top sources:");
+  for (const source of sources) {
+    console.log(`    ${source.source}: ${source.nodes} nodes, ${source.triangles} triangles`);
+  }
+}
+
+function printGlbImages(glb) {
+  const images = (glb.images || []).filter((image) => image.bytes > 0).slice(0, 5);
+  if (!images.length) return;
+  console.log("  Top embedded images:");
+  for (const image of images) {
+    console.log(`    ${image.name || "unnamed"}: ${formatBytes(image.bytes)}`);
+  }
+}
+
 module.exports = {
   BUDGETS,
   analyzeOsmPreflight,
diff --git a/scripts/lib/stage-manifest.js b/scripts/lib/stage-manifest.js
index 23e330e..8acde5d 100644
--- a/scripts/lib/stage-manifest.js
+++ b/scripts/lib/stage-manifest.js
@@ -9,6 +9,8 @@ const BUDGETS = {
   glbBytes: 25 * 1024 * 1024,
   glbNodes: 1000,
   glbImages: 24,
+  glbTriangles: 250000,
+  glbImageBytes: 20 * 1024 * 1024,
 };
 
 function stageManifestPath(area, stage) {
@@ -64,18 +66,36 @@ function glbSummary(digest) {
 }
 
 function glbBudgetWarnings(label, digest, budgets = BUDGETS) {
-  if (!digest) return [];
-  const warnings = [];
-  if (digest.fileBytes > budgets.glbBytes) {
-    warnings.push(`${label} GLB size ${mb(digest.fileBytes)} MB exceeds budget ${mb(budgets.glbBytes)} MB`);
-  }
-  if (digest.counts.nodes > budgets.glbNodes) {
-    warnings.push(`${label} GLB nodes ${digest.counts.nodes} exceed budget ${budgets.glbNodes}`);
-  }
-  if (digest.counts.images > budgets.glbImages) {
-    warnings.push(`${label} GLB images ${digest.counts.images} exceed budget ${budgets.glbImages}`);
-  }
-  return warnings;
+  return evaluateGlbBudget(digest, budgets).violations.map(
+    (violation) => `${label} ${violation.label} ${formatBudgetValue(violation.actual, violation.unit)} ` +
+      `exceeds budget ${formatBudgetValue(violation.limit, violation.unit)}`,
+  );
+}
+
+function evaluateGlbBudget(digest, budgets = BUDGETS) {
+  const usage = {
+    glbBytes: digest?.fileBytes ?? 0,
+    glbNodes: digest?.counts?.nodes ?? 0,
+    glbImages: digest?.counts?.images ?? 0,
+    glbTriangles: digest?.counts?.renderTriangles ?? 0,
+    glbImageBytes: digest?.embeddedImageBytes ?? 0,
+  };
+  const definitions = [
+    ["glbBytes", "GLB size", "bytes"],
+    ["glbNodes", "GLB nodes", "count"],
+    ["glbImages", "GLB images", "count"],
+    ["glbTriangles", "GLB rendered triangles", "count"],
+    ["glbImageBytes", "GLB embedded image bytes", "bytes"],
+  ];
+  const limits = { ...BUDGETS, ...budgets };
+  const violations = definitions
+    .filter(([key]) => usage[key] > limits[key])
+    .map(([key, label, unit]) => ({ key, label, unit, actual: usage[key], limit: limits[key] }));
+  return { usage, limits, violations };
+}
+
+function formatBudgetValue(value, unit) {
+  return unit === "bytes" ? `${mb(value)} MB` : String(value);
 }
 
 function sha256(file) {
@@ -90,6 +110,7 @@ function mb(bytes) {
 
 module.exports = {
   BUDGETS,
+  evaluateGlbBudget,
   fileRecord,
   glbBudgetWarnings,
   glbSummary,
diff --git a/scripts/test-asset-budgets.js b/scripts/test-asset-budgets.js
new file mode 100644
index 0000000..971c652
--- /dev/null
+++ b/scripts/test-asset-budgets.js
@@ -0,0 +1,58 @@
+#!/usr/bin/env node
+"use strict";
+
+const assert = require("assert");
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
+const { normalizeAreaConfig } = require("./lib/area-config");
+const { digestGltf } = require("./glb-digest");
+const { evaluateGlbBudget, BUDGETS } = require("./lib/stage-manifest");
+
+const gltf = {
+  nodes: [
+    { name: "Building_1", mesh: 0 },
+    { name: "Shapespark_tree-01", mesh: 1 },
+  ],
+  meshes: [
+    { name: "Building", primitives: [{ indices: 0, attributes: { POSITION: 1 } }] },
+    { name: "Tree", primitives: [{ indices: 2, attributes: { POSITION: 3 } }] },
+  ],
+  accessors: [{ count: 12 }, { count: 4 }, { count: 9 }, { count: 3 }],
+  images: [{ name: "large", bufferView: 0 }, { name: "small", bufferView: 1 }],
+  bufferViews: [{ byteLength: 800 }, { byteLength: 200 }],
+};
+const digest = digestGltf(gltf, { file: "fixture.glb", fileBytes: 1500 });
+assert.equal(digest.counts.triangles, 7);
+assert.equal(digest.counts.renderTriangles, 7);
+assert.equal(digest.embeddedImageBytes, 1000);
+assert.deepEqual(digest.sourceSummary.map((entry) => [entry.source, entry.triangles]), [["buildings", 4], ["vegetation", 3]]);
+assert.deepEqual(digest.images.map((image) => image.bytes), [800, 200]);
+
+const budget = { ...BUDGETS, glbBytes: 1000 };
+assert.equal(evaluateGlbBudget(digest, budget).violations[0].key, "glbBytes");
+
+const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "asset-budget-"));
+const input = path.join(tempDir, "input.osm");
+fs.writeFileSync(input, "<osm/>");
+const base = { id: "test-area", input, outputRoot: tempDir };
+assert.equal(normalizeAreaConfig({ ...base, budget: { nodes: 800 } }).budget.glbNodes, 800);
+assert.throws(
+  () => normalizeAreaConfig({ ...base, budget: { nodes: 1200 } }),
+  /budget.reason is required/,
+);
+assert.throws(
+  () => normalizeAreaConfig({ ...base, budget: { triangles: 0 } }),
+  /budget.triangles must be a positive integer/,
+);
+assert.throws(
+  () => normalizeAreaConfig({ ...base, budget: "large" }),
+  /budget must be an object/,
+);
+assert.equal(
+  normalizeAreaConfig({ ...base, budget: { nodes: 1200, reason: "Dense campus vegetation" } }).budget.glbNodes,
+  1200,
+);
+fs.rmSync(tempDir, { recursive: true, force: true });
+
+console.log("Asset budget tests passed.");