Antigravity Agent
161 lines
5.3 KiB
Markdown
161 lines
5.3 KiB
Markdown
---
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id: wiki-2026-0508-ifcjs-fragment
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title: IFCjs (Fragment)
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [IFC.js, ThatOpen Fragment, web-ifc, BIM web viewer]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.85
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verification_status: applied
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tags: [bim, ifc, threejs, web, fragment]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: TypeScript
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framework: Three.js, web-ifc, ThatOpen Components
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---
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# IFCjs (Fragment)
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## 매 한 줄
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> **"매 IFC BIM model 의 web-native streaming 형식"**. 매 2021 IFC.js (Antonio Gonzalez Viegas) → 매 2024 ThatOpen Components 로 rebrand 된 toolchain. 매 Fragment format 매 IFC 의 매 GPU-friendly binary representation — 매 1GB IFC 가 매 50MB Fragment 로 압축, 매 browser 의 매 instant load.
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## 매 핵심
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### 매 IFC 의 limitation
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- 매 STEP-based ASCII format — 매 100MB+ project 매 routine.
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- 매 spatial hierarchy + property + geometry 매 모두 nested — 매 partial load 의 X.
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- 매 Three.js 의 직접 render 의 X — 매 tessellation needed.
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### 매 Fragment 의 solution
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- 매 web-ifc (WASM) 가 매 IFC parse + tessellate.
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- 매 결과를 매 Fragment binary (FlatBuffers-based) 로 serialize.
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- 매 InstancedMesh 단위 grouping → 매 draw call 격감.
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- 매 property data 매 별도 SQLite-WASM file → 매 lazy query.
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### 매 응용
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1. 건축 설계 review web tool.
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2. Construction 현장 mobile BIM viewer.
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3. Facility management dashboard.
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4. Clash detection web service.
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## 💻 패턴
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### 1. ThatOpen Components 초기화 (2026)
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```ts
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import * as OBC from "@thatopen/components";
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import * as OBCF from "@thatopen/components-front";
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const components = new OBC.Components();
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const worlds = components.get(OBC.Worlds);
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const world = worlds.create<
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OBC.SimpleScene, OBC.SimpleCamera, OBCF.PostproductionRenderer
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>();
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world.scene = new OBC.SimpleScene(components);
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world.renderer = new OBCF.PostproductionRenderer(components, container);
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world.camera = new OBC.SimpleCamera(components);
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components.init();
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```
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### 2. IFC → Fragment 변환
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```ts
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const ifcLoader = components.get(OBC.IfcLoader);
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await ifcLoader.setup();
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const file = await fetch("model.ifc");
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const buffer = new Uint8Array(await file.arrayBuffer());
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const model = await ifcLoader.load(buffer);
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world.scene.three.add(model);
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```
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### 3. 미리 만든 Fragment load (instant)
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```ts
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const fragments = components.get(OBC.FragmentsManager);
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const data = await fetch("model.frag").then(r => r.arrayBuffer());
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const group = fragments.load(new Uint8Array(data));
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world.scene.three.add(group);
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```
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### 4. Property query (lazy)
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```ts
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const indexer = components.get(OBC.IfcRelationsIndexer);
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await indexer.process(model);
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// Get all walls
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const walls = await indexer.getEntitiesByType(model, "IFCWALL");
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for (const expressID of walls) {
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const props = await model.getProperties(expressID);
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console.log(props.Name.value);
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}
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```
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### 5. Highlight on click
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```ts
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const highlighter = components.get(OBCF.Highlighter);
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highlighter.setup({ world });
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highlighter.events.select.onHighlight.add((selection) => {
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console.log("Selected fragments:", selection);
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});
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```
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### 6. Section plane (clipper)
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```ts
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const clipper = components.get(OBC.Clipper);
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clipper.enabled = true;
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container.addEventListener("dblclick", () => clipper.create(world));
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```
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### 7. Streaming (large model)
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```ts
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const streamer = components.get(OBCF.IfcStreamer);
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streamer.url = "https://cdn.example.com/fragments/";
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streamer.world = world;
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await streamer.load(
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await fetch("model-streamed.json").then(r => r.json()),
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true // coordinate to origin
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);
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Small model (< 50MB IFC) | 직접 IfcLoader.load() |
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| Medium (50-500MB) | 사전 변환된 .frag file |
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| Large (500MB+) | IfcStreamer (tile-based LOD) |
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| Property-heavy query | IfcRelationsIndexer + cached |
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| Mobile viewer | Fragment + simplified geometry |
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**기본값**: ThatOpen Components 2026 + Fragment 사전 변환 + property cache.
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## 🔗 Graph
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- 부모: [[BIM (Building Information Modeling)]] · [[IFC (Industry Foundation Classes)]]
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- 변형: [[Speckle]] · [[xeokit]] · [[Forge Viewer]]
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- 응용: [[Web BIM Viewer]] · [[Clash Detection]] · [[Facility Management]]
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- Adjacent: [[Three.js]] · [[WASM]] · [[FlatBuffers]]
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## 🤖 LLM 활용
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**언제**: 매 web-based BIM viewer 매 build. 매 IFC model 매 browser 의 instant load 가 필요. 매 open-source 매 prefer (Forge 의 X).
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**언제 X**: 매 desktop-only workflow (Revit/Navisworks 매 충분). 매 < 10MB model (overkill). 매 photorealistic render (use Unreal/Unity).
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## ❌ 안티패턴
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- **IFC 매 매번 parse**: 매 100MB IFC 매 user 마다 30초 wait. 매 backend 사전 변환 필수.
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- **Property 매 eager load**: 매 모든 property 매 memory load → OOM. 매 lazy + query-on-demand.
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- **InstancedMesh 무시**: 매 IFC 의 매 1000+ identical column 매 매 separate Mesh → 매 draw call 폭발.
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- **GlobalId 의 X**: 매 Fragment internal ID 매 IFC GlobalId 와 매 different — 매 cross-system mapping 매 GlobalId 사용.
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## 🧪 검증 / 중복
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- Verified (ThatOpen/engine_components GitHub 2026-05, web-ifc 0.0.66+).
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- 신뢰도 A (rapidly-evolving project — 매 minor API drift 가능).
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — ThatOpen Components 2026 API + Fragment streaming |
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