---
description: Standards for map generation, seeding, and textures.
globs: src/generation/*.js**
---

# **Procedural Generation Standards**

## **Core Principles**

1. **Determinism:** All generators must accept a seed. Using the same seed must produce the exact same map and textures. Use src/utils/SeededRandom.js.
2. **Additive vs Subtractive:**
   - **Ruins:** Use Additive (Fill 0, Build Rooms).
   - **Caves:** Use Subtractive/Cellular (Fill 1, Carve Caves).
3. **Playability:**
   - Always run PostProcessor.ensureConnectivity() to prevent soft-locks.
   - Always ensure valid "Floor" tiles exist for spawning.

## **Texture Generation**

- Use OffscreenCanvas for texture generation to support Web Workers.
- Return a composite object (diffuse, normal, roughness) for PBR materials.
- Output textures to generatedAssets object, do not apply directly to Three.js materials inside the generator.