Function DoZoomEffect

Descent3/WeaponFire.cpp:2696–2751

Zooms in for this weapon

// Zooms in for this weapon
void DoZoomEffect(player_weapon *pw, uint8_t clear) {
  if (pw->firing_time < .5) {
    Players[Player_num].turn_scalar = 1.0;
    Render_FOV = D3_DEFAULT_FOV;

    if (!clear)
      DoZoomStay();
    return;
  }

  Players[Player_num].turn_scalar = .3f;

  if (pw->firing_time > 1.0) {
    // We are fully zoomed in

    Players[Player_num].flags |= PLAYER_FLAGS_ZOOMED;
    Render_FOV = ZOOM_FOV_TARGET;
    Zoom_fov_time = ZOOM_STAY_TIME;

    // See if we hit anything
    // Cast a ray to see what we've hit
    Players[Player_num].flags &= ~PLAYER_FLAGS_BULLSEYE;
    object *obj = &Objects[Players[Player_num].objnum];
    int fate;          // Collision type for response code
    fvi_info hit_info; // Hit information
    fvi_query fq;      // Movement query
    vector dest = obj->pos + (obj->orient.fvec * 5000.0);

    fq.p0 = &obj->pos;
    fq.startroom = obj->roomnum;
    fq.p1 = &dest;
    fq.rad = .0001f;
    fq.thisobjnum = Objects - obj;
    fq.ignore_obj_list = NULL;
    fq.flags = FQ_CHECK_OBJS | FQ_IGNORE_POWERUPS | FQ_IGNORE_WEAPONS;

    fate = fvi_FindIntersection(&fq, &hit_info);

    Players[Player_num].zoom_distance = vm_VectorDistance(&obj->pos, &hit_info.hit_pnt);

    if (fate == HIT_SPHERE_2_POLY_OBJECT || fate == HIT_OBJECT) {
      object *hit_obj = &Objects[hit_info.hit_object[0]];
      if (hit_obj->type == OBJ_ROBOT || hit_obj->type == OBJ_PLAYER ||
          (hit_obj->type == OBJ_BUILDING && hit_obj->ai_info))
        Players[Player_num].flags |= PLAYER_FLAGS_BULLSEYE;
    }
    return;
  }

  // calculate zoom effect
  float norm = (pw->firing_time - .5) * 2;

  Render_FOV = (ZOOM_FOV_TARGET * norm) + ((1.0 - norm) * D3_DEFAULT_FOV);

  return;
}

// Called when a player dies or switches weapons to clear out any active weapon stuff