Function AttachRandomNapalmEffectsToObject

Descent3/viseffect.cpp:2224–2287

Attaches viseffects that move with an object

// Attaches viseffects that move with an object
void AttachRandomNapalmEffectsToObject(object *obj) {
  if (obj->flags & OF_DEAD)
    return;

  vector velocity_norm = obj->mtype.phys_info.velocity;
  vm_NormalizeVector(&velocity_norm);
  vector pos = obj->pos - (velocity_norm * (obj->size / 2));

  if (obj->movement_type == MT_PHYSICS && (OBJECT_OUTSIDE(obj) && (ps_rand() % 3) == 0) || (ps_rand() % 3) == 0)
    CreateFireball(&pos, BLACK_SMOKE_INDEX, obj->roomnum, VISUAL_FIREBALL);

  float size_scalar = obj->size / 7.0;

  size_scalar = std::clamp(size_scalar, 1.0f, 4.0f);

  // Create an explosion that follows every now and then
  if ((ps_rand() % 3) == 0) {
    if (!(obj->flags & OF_POLYGON_OBJECT))
      return;

    int num = 1;

    num += (obj->size / 15);

    for (int i = 0; i < num; i++) {
      vector dest;
      poly_model *pm = &Poly_models[obj->rtype.pobj_info.model_num];

      if (pm->n_models == 0)
        return;

      int subnum = ps_rand() % pm->n_models;

      if (IsNonRenderableSubmodel(pm, subnum))
        continue;

      bsp_info *sm = &pm->submodel[subnum];

      if (sm->nverts == 0)
        return;

      int vertnum = ps_rand() % sm->nverts;

      GetPolyModelPointInWorld(&dest, &Poly_models[obj->rtype.pobj_info.model_num], &obj->pos, &obj->orient, subnum,
                               &sm->verts[vertnum]);
      int visnum = VisEffectCreate(VIS_FIREBALL, GetRandomSmallExplosion(), obj->roomnum, &dest);
      if (visnum == -1)
        return;

      VisEffects[visnum].size += ((ps_rand() % 20) / 20.0) * 1.0;

      VisEffects[visnum].size *= size_scalar;

      if ((ps_rand() % 2)) {
        if (obj->movement_type == MT_PHYSICS) {
          VisEffects[visnum].movement_type = MT_PHYSICS;
          VisEffects[visnum].velocity = obj->mtype.phys_info.velocity;
          VisEffects[visnum].mass = obj->mtype.phys_info.mass;