Pose the laser scene and hold it still, so it can be poked at

T.laserScene() (or #laser on the URL) drops into splatter with six bodies of
different types at known depths, the laser armed, a pull held, and the world
paused.

T.pause(true) freezes the WORLD but keeps drawing, which is the whole point: a
value changed in devtools shows on the next frame while the scene stands still.
The old recipe halted rAF, which freezes the picture too and is no use for
judging how something looks.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

main.js

@@ -13,9 +13,14 @@ import { cv } from './dom.js';
 import './input.js';
 
 let last = performance.now();
+// T.pause(true) freezes the WORLD but keeps drawing, so a value changed in devtools shows up on the
+// next frame without the scene moving on underneath you. Halting rAF instead (the old test recipe)
+// freezes the picture too, which is useless for looking at a shot.
+let paused = false;
 function frame(now) {
   requestAnimationFrame(frame); // schedule FIRST: one bad frame must never kill the loop (a thrown error froze the game for good)
   if (TUNE.fps && now - last < 1000 / TUNE.fps - 2) return; // frame cap (battery): skip RAF ticks until it's our beat
+  if (paused) { last = now; render(); return; }
   let dt = Math.min(0.04, (now - last) / 1000); last = now;
   // A chapter boss dies in slow motion. The clock that ENDS it runs at real speed, so the effect is
   // always the same length in seconds however far the world has been slowed.
@@ -194,9 +199,44 @@ cv.addEventListener('pointerdown', e => {
   if (umpTaps.length >= 3) { umpTaps = []; forceZombies(); }
 });
 
+
+// ---- A POSED SCENE for looking at the laser. `T.laserScene()` in the console, or load the page
+// with #laser. It drops you into splatter with a spread of bodies at known depths, the laser armed
+// and a pull held, renders it, and PAUSES the world so devtools edits (TUNE.beamY, beamW1, the
+// colours in drawBeamWedge) can be judged against a still picture.
+function laserScene() {
+  const intro = document.getElementById('intro');
+  if (intro) intro.hidden = true;
+  paused = false;
+  if (G.mode === 'tennis') forceZombies();
+  for (let i = 0; i < 600; i++) update(1 / 60);      // ride the transition out into splatter
+  G.modal = null; G.horde = null; G.interlude = false; G.changeover = 0; G.clearing = false;
+  G.mgT = 0; G.gunId = null; G.beam = null; G.bossFight = 0; G.hp = G.hpMax = TUNE.playerHp;
+  zombies.length = 0; pellets.length = 0; parts.length = 0; gore.length = 0; piles.length = 0;
+  score.server = 'P'; setupPoint();
+  P.x = 0;
+  TUNE.zMax = 0;                                     // no new spawns wandering into the shot
+  // one of everything, at four depths, straddling the lane so the cut lands at different heights
+  for (const [x, z, v] of [[0, 20, 'a'], [0.75, 16, 'b'], [-0.85, 12, 'k'],
+                           [0.85, 8.5, 'g'], [-0.75, 5.5, 'h'], [0, 3, 'e']]) {
+    spawnZombie(x, z, v);
+    zombies[zombies.length - 1].v = 0;               // hold still: this is a photograph
+  }
+  G.rack.length = 0; G.temp = null;
+  G.weapon = grantWeapon('laser');
+  G.modal = null;
+  G.aim = { fx: 0, fy: -1, mag: 100 };               // a full pull straight up-court (fy is NEGATIVE)
+  update(1 / 60); P.x = 0;
+  render();
+  paused = true;
+  return 'laser scene posed and PAUSED. T.pause(false) to run again, T.render() to redraw by hand.';
+}
+// a plain timer, not the load event: this module runs as a module, so `load` may already have gone
+if (location.hash === '#laser') setTimeout(laserScene, 600);
+
 requestAnimationFrame(frame);
 
 // exposed for in-browser sanity checks and simulated playtests
-window.T = { TUNE, ball, P, O, score, G, zombies, spawnZombie, spawnRacketZombie, spawnMachine, spawnChapterBoss, spawnBarrel, grantWeapon, toggleTestMode, piles, gore, parts, pellets, extras, shots, explode, hurtPlayer, killPlayer, splatPoint, solveShot, inServeBox, inCourt, proj, setupPoint, forceZombies, deliverTin, selectWeapon, showModal, dismissModal, startDuel, resolveInterlude, flickTarget, startBossFight, endBossFight,
+window.T = { TUNE, ball, P, O, score, G, zombies, laserScene, pause: v => { paused = v !== false; }, spawnZombie, spawnRacketZombie, spawnMachine, spawnChapterBoss, spawnBarrel, grantWeapon, toggleTestMode, piles, gore, parts, pellets, extras, shots, explode, hurtPlayer, killPlayer, splatPoint, solveShot, inServeBox, inCourt, proj, setupPoint, forceZombies, deliverTin, selectWeapon, showModal, dismissModal, startDuel, resolveInterlude, flickTarget, startBossFight, endBossFight,
   step: dt => update(dt), render, press: keyPressed,
   get phase() { return G.phase; }, set phase(v) { G.phase = v; } };