# Grenades and growing waves

- Right mouse button: throw while mouse is captured and player alive.
- Cooldown: 15 seconds from launch, displayed in HUD; cannot be bypassed by repeated clicks.
- Physical RigidBody3D: sphere radius 0.12m, mass0.4kg, bounce0.45, friction0.65, gravity, CCD; launch velocity forward12m/s + up3m/s + player velocity. Thrower excluded from projectile collision but not blast damage.
- Fuse: four physics seconds from spawn; one deferred detonation.
- Blast radius5m, maximum damage160 diminishing linearly with distance; world collision ray blocks damage through walls. Includes thrower if alive. CPU particles/flash and original Half-Life explode3–5.wav.
- Original Valve grenade.mdl contains two embedded textures; copied unchanged and exported to native grenade.scn for Web. Provenance in assets/half_life_manifest.json; extraction script tools/extract_grenade_assets.py.
- Wave size: 4 + 2*wave (6,8,10,...), no old24 limit. Next wave three seconds after all enemies die and spawning completes. Scheduling guard prevents duplicate wave timers. Corpses remain.

## Tests

Godot4.7.1:

```
--headless --path . --script res://tools/test_grenade.gd
--headless --path . --script res://tools/test_wave_growth.gd
```

Grenade test PASS: movement/gravity, fuse3.997s, actual15s cooldown, visible/blocked/out-of-radius damage, self-damage and formula26 enemies for wave11. Wave test PASS: six zombies cleared, single next wave spawns eight, six corpses retained; an existing shutdown resource warning remains in the wave test, not a gameplay error.

Published Web release4e181f0fe5d02cc9 at https://enne2.net/pub/zombie-fps/; gzip+immutable cache retained. Browser right-click test showed HUD countdown10s after throw. Backup prior root HTML: /home/debian/zombie-fps-backups/index-before-grenade.html. Previous releases kept; no nginx changes.