aether-shards/.agent/rules/generation/RULE.md

description	globs
Standards for map generation, seeding, and textures.	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.