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+---
+id: wiki-2026-0508-procedural-architecture-systems
+title: Procedural Architecture Systems
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [PCG Architecture, Procedural Generation Systems]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.85
+verification_status: applied
+tags: [architecture, pcg, gamedev, generation]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: cpp
+  framework: unreal-houdini
+---
+
+# Procedural Architecture Systems
+
+## 매 한 줄
+> **"매 building / city 매 hand-author 의 X — 매 rules + grammar + noise 매 generate"**. 매 No Man's Sky / Minecraft / Townscaper / Houdini 매 production-grade. 매 2026 LLM-driven layout 매 mainstream (e.g. Inworld + procedural blockout).
+
+## 매 핵심
+
+### 매 layers
+- **Macro**: 매 city / region — Voronoi, road network, biome.
+- **Meso**: 매 building footprint, lot subdivision (BSP, L-system).
+- **Micro**: 매 facade grammar, room layout, props placement.
+
+### 매 techniques
+- **Shape grammars**: CGA Shape (Müller 2006) — 매 split, repeat, comp, replace ops.
+- **Wave Function Collapse**: tile constraint solver — 매 Townscaper 매 famous.
+- **L-systems**: 매 organic / fractal (street trees, ivy).
+- **Noise**: Perlin / Simplex / Worley — 매 base terrain.
+- **Constraint propagation**: 매 SAT/CSP for room layout.
+
+### 매 응용
+1. AAA open-world filler (Ubisoft, GTA city blocks).
+2. Roguelike dungeon (Spelunky, Hades).
+3. ArchViz mass modeling — Houdini PDG.
+4. UGC (Roblox, Dreams) — runtime gen.
+
+## 💻 패턴
+
+### Wave Function Collapse (Python)
+```python
+import numpy as np, random
+
+def wfc(tiles, adjacency, w, h):
+    grid = [[set(tiles) for _ in range(w)] for _ in range(h)]
+    while any(len(c) > 1 for row in grid for c in row):
+        # pick lowest-entropy cell
+        x, y = min(((i, j) for i, row in enumerate(grid)
+                    for j, c in enumerate(row) if len(c) > 1),
+                   key=lambda p: len(grid[p[0]][p[1]]))
+        choice = random.choice(list(grid[x][y]))
+        grid[x][y] = {choice}
+        propagate(grid, adjacency, x, y)
+    return [[next(iter(c)) for c in row] for row in grid]
+```
+
+### Shape grammar (CGA-style)
+```python
+def split_facade(rect, rules):
+    # axiom: Facade -> Floor*
+    floors = subdivide(rect, axis='y', sizes=[3.0, 3.0, 3.0])
+    for f in floors:
+        windows = subdivide(f, axis='x', sizes=[1.5]*5)
+        for w in windows:
+            emit_mesh('window_unit', w)
+```
+
+### L-system street network
+```python
+def lsystem(axiom, rules, depth):
+    s = axiom
+    for _ in range(depth):
+        s = ''.join(rules.get(c, c) for c in s)
+    return s
+
+# F=forward, +=turn, [=push
+streets = lsystem("F", {"F": "F[+F]F[-F]F"}, 4)
+```
+
+### Noise-based terrain (GLSL)
+```glsl
+float fbm(vec2 p) {
+    float v = 0.0, a = 0.5;
+    for (int i = 0; i < 6; i++) {
+        v += a * snoise(p);
+        p *= 2.0; a *= 0.5;
+    }
+    return v;
+}
+```
+
+### Houdini PDG-style chunked gen (pseudo)
+```python
+# Chunk world into tiles, generate independently
+for tile in tiles:
+    seed = hash((tile.x, tile.z))
+    rng = np.random.default_rng(seed)
+    buildings = place_buildings(tile, rng)
+    export(f"tile_{tile.x}_{tile.z}.usd", buildings)
+```
+
+### LLM-augmented blockout (2026)
+```python
+prompt = f"""Design a {style} village, 12 buildings.
+Output JSON: [{{type, x, z, rotation, size}}]"""
+plan = json.loads(claude.complete(prompt))
+for b in plan:
+    spawn_building(b['type'], (b['x'], b['z']), b['rotation'])
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| 매 grid-tile aesthetic | WFC |
+| 매 organic city | L-system + agent sim |
+| 매 facade detail | Shape grammar (CGA) |
+| 매 terrain | Noise + erosion sim |
+| 매 narrative-coherent | LLM-driven plan + procedural detail |
+
+**기본값**: 매 hybrid — LLM macro plan + procedural meso/micro.
+
+## 🔗 Graph
+- 부모: [[Procedural Generation]]
+- Adjacent: [[Perlin Noise]] · [[CSP]]
+
+## 🤖 LLM 활용
+**언제**: 매 high-level layout / narrative coherence — LLM 매 plan, procedural 매 detail. 매 prompt-to-blockout (2026 Inworld, Promethean).
+**언제 X**: 매 real-time per-frame gen — LLM latency 너무 김. 매 precompute / edge-cache.
+
+## ❌ 안티패턴
+- **Pure noise**: 매 visible repetition / no semantic. 매 layered noise + masking 필수.
+- **No seed control**: 매 reproducibility 부재 — debugging hell.
+- **Monolithic gen**: 매 entire world in one pass — chunked / streamable 필요.
+
+## 🧪 검증 / 중복
+- Verified (Müller — CGA Shape 2006; Gumin — WFC 2016; Houdini PDG docs 19.5+).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — full PCG architecture entry |