Function check_for_special_surface

physics/collide.cpp:1049–1083

Check for lava, volatile, or water surface. If contact, make special sound & kill the weapon

// Check for lava, volatile, or water surface.  If contact, make special sound & kill the weapon
void check_for_special_surface(object *weapon, int surface_tmap, vector *surface_normal, float hit_dot) {
  bool f_forcefield, f_volatile, f_lava, f_water;

  f_forcefield = (GameTextures[surface_tmap].flags & TF_FORCEFIELD) != 0;
  f_volatile = (GameTextures[surface_tmap].flags & TF_VOLATILE) != 0;
  f_lava = (GameTextures[surface_tmap].flags & TF_LAVA) != 0;
  f_water = (GameTextures[surface_tmap].flags & TF_WATER) != 0;

  // Kill the weapon if the surface is volatile, lava, or water
  if (f_volatile || f_lava || f_water) {
    int snd;
    ain_hear hear;
    hear.f_directly_player = false;

    if (f_water) {
      snd = SOUND_WEAPON_HIT_WATER;
      hear.hostile_level = 0.2f;
      hear.curiosity_level = 0.3f;
    } else if (f_volatile || f_lava) {
      snd = SOUND_WEAPON_HIT_LAVA;
      hear.hostile_level = 0.1f;
      hear.curiosity_level = 0.5f;
    } else
      Int3();

    hear.max_dist = Sounds[snd].max_distance;
    Sound_system.Play3dSound(snd, SND_PRIORITY_NORMAL, weapon);
    AINotify(weapon, AIN_HEAR_NOISE, (void *)&hear);

    if (!f_water)
      DoWeaponExploded(weapon, surface_normal);

    SetObjectDeadFlag(weapon);
  }
}

// Process a collision between a weapon and a wall
// Returns true if the weapon hits the wall, and false if should keep going though the wall (for breakable glass)