Implement Fog of War

Build fog of war as a shared perception system with a restrained presentation layer.

When to use this skill

• Implementing obstacle-aware fog of war and visibility masks for orthographic or isometric Three.js action games.
• Building or tuning the player's angular visibility lookup texture and the full-screen soft radial and wall-aware fog shader.
• Debugging fog shader artifacts such as visible spokes, hard wall edges, or an obvious angle seam.
• Wiring gameplay perception truth (hidden-enemy targeting, aim selection, HUD counts, telegraphs) so it never leaks through fog pixels.
• Integrating fog with scene lifecycle and state — menus, inventory, review/capture modes, paused states, and stage transitions — and validating with deterministic perception/render-budget tests.
• Not for general Three.js game architecture, rendering, or physics unrelated to fog/perception — route that to this repo's web-game-development pack instead.

Preserve the architecture

Keep these responsibilities separate: