Fog of war: underground is black until the bot has seen it (t8)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/info.js

@@ -76,6 +76,7 @@ function reactionsOf(m, forNotebook) {
 // What is under the cursor: t1 is the name, t2 the details, warn a short problem
 // (too hard, out of reach) for the label next to the cursor.
 function hoverInfo(ax, ay) {
+  if (SET.fog && fogSeen(ax, ay) < 64) return { t1: 'Unexplored', t2: [], t3: [] };
   if (ax < 0 || ay < 0 || ax >= W || ay >= H) return { t1: '', t2: ['Outside the world'], warn: '', air: true };
   const i = ay * W + ax, m = mat[i];
   let warn = '';

src/ui/settings.js

@@ -45,6 +45,7 @@ const SET_TABS = {
     { html: () => controlsHtml() },
   ],
   Game: [
+    { k: 'fog', label: 'Fog of war', d: 'Places you have not seen yet are black. Off shows the whole world.', type: 'toggle' },
     { k: 'cardSeconds', label: 'Discovery cards', d: 'How long a card stays when you find or make something new. Everything is also in the notebook.', type: 'select', opts: [[0, 'Off'], [5, '5 seconds'], [9, '9 seconds'], [15, '15 seconds'], [-1, 'Until I close them']] },
     { k: 'autosave', label: 'Autosave', type: 'select', opts: [[0, 'Off'], [1, 'Every minute'], [3, 'Every 3 minutes'], [5, 'Every 5 minutes'], [10, 'Every 10 minutes']] },
     { k: 'save', label: 'Save', d: 'Saves to this browser.', type: 'button', text: 'Save now', fn: () => saveWorld('main'), ingame: true },

src/ui/state.js

@@ -5,7 +5,7 @@
 const SET_DEFAULT = {
   zoom: 12, integerScale: true, renderScale: 1, uiScale: 1, fpsCap: 0, showPerf: false, shake: true, cameraSmooth: 0.7, cameraLead: true,
   look: 'smooth', lighting: 'full', lightEvery: 1, ambient: 0.12, daylight: 1, glow: 'low', grain: 1, incandescence: true, particles: true,
-  thermalPalette: 'inferno', simSpeed: 1, maxSteps: 3,
+  fog: true, thermalPalette: 'inferno', simSpeed: 1, maxSteps: 3,
   volMaster: 0.8, volMusic: 0.5, volSfx: 0.8, muted: false, muteUnfocused: true,
   deadzone: 0.18, aimSpeed: 1, autosave: 3, cardSeconds: 9, cursorLabel: true, sv: 2,
 };