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3D Building Mechanics

building-mechanics

Three.js 3D building system with spatial indexing, structural physics, and multiplayer networking. Use when creating survival games, sandbox builders, or any game with player-constructed structures. Covers performance optimization (spatial hash grids, octrees, chunk loading), structural validatio...

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SKILL.md

Full skill instructions

3D Building Mechanics

Complete building system for Three.js games with performance optimization, structural physics, and multiplayer networking.

Quick Start

import { SpatialHashGrid } from './​scripts/​spatial-hash-grid.js';
import { HeuristicValidator } from './​scripts/​heuristic-validator.js';

// Spatial indexing for fast queries
const spatialIndex = new SpatialHashGrid(10);
spatialIndex.insert(piece, piece.position);
const nearby = spatialIndex.queryRadius(position, 15);

// Structural validation (Rust/​Valheim style)
const validator = new HeuristicValidator({ mode: 'heuristic' });
validator.addPiece(piece);
const canPlace = validator.validatePlacement(newPiece);

Reference Files

Read these for detailed implementation guidance:

  • references/​performance-at-scale.md - Spatial partitioning, chunk loading, instancing, LOD
  • references/​structural-physics-advanced.md - Arcade vs heuristic vs realistic physics
  • references/​multiplayer-networking.md - Authority models, delta sync, conflict resolution

Scripts

Performance (references/​performance-at-scale.md)

  • scripts/​spatial-hash-grid.js - O(1) queries for uniform distribution
  • scripts/​octree.js - Adaptive queries for clustered bases
  • scripts/​chunk-manager.js - World streaming for large maps
  • scripts/​performance-profiler.js - Benchmarking utilities

Structural Physics (references/​structural-physics-advanced.md)

  • scripts/​heuristic-validator.js - Fast validation (Fortnite/​Rust/​Valheim modes)
  • scripts/​stability-optimizer.js - Caching and batch updates
  • scripts/​damage-propagation.js - Damage states, cascading collapse
  • scripts/​physics-engine-lite.js - Optional realistic physics

Multiplayer (references/​multiplayer-networking.md)

  • scripts/​delta-compression.js - Only send changed state
  • scripts/​client-prediction.js - Optimistic placement with rollback
  • scripts/​conflict-resolver.js - Handle simultaneous builds
  • scripts/​building-network-manager.js - Complete server/​client system

Key Patterns

Spatial Indexing Selection

PiecesDistributionUse
<1,000AnyArray
1-5kUniformSpatialHashGrid
1-5kClusteredOctree
5k+AnyChunkManager + Octree

Physics Mode Selection

  • Arcade (Fortnite): Connectivity only, instant collapse, best for combat
  • Heuristic (Rust/​Valheim): Stability %, predictable, best for survival
  • Realistic: Full stress/​strain, expensive, best for engineering sims

Multiplayer Pattern

Server-authoritative with client prediction. Use delta compression for sync.

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