src/clientenvironment.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2017 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "util/serialize.h"
  21 #include "util/pointedthing.h"
  22 #include "clientenvironment.h"
  23 #include "clientsimpleobject.h"
  24 #include "clientmap.h"
  25 #include "mapblock_mesh.h"
  26 #include "event.h"
  27 #include "collision.h"
  28 #include "profiler.h"
  29 #include "raycast.h"
  30 #include "voxelalgorithms.h"
  31 #include "settings.h"
  32
  33 /*
  34         ClientEnvironment
  35 */
  36
  37 ClientEnvironment::ClientEnvironment(ClientMap *map, scene::ISceneManager *smgr,
  38         ITextureSource *texturesource, Client *client,
  39         IrrlichtDevice *irr):
  40         m_map(map),
  41         m_local_player(NULL),
  42         m_smgr(smgr),
  43         m_texturesource(texturesource),
  44         m_client(client),
  45         m_irr(irr)
  46 {
  47         char zero = 0;
  48         memset(attachement_parent_ids, zero, sizeof(attachement_parent_ids));
  49 }
  50
  51 ClientEnvironment::~ClientEnvironment()
  52 {
  53         // delete active objects
  54         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
  55                 i != m_active_objects.end(); ++i) {
  56                 delete i->second;
  57         }
  58
  59         for(std::vector<ClientSimpleObject*>::iterator
  60                 i = m_simple_objects.begin(); i != m_simple_objects.end(); ++i) {
  61                 delete *i;
  62         }
  63
  64         // Drop/delete map
  65         m_map->drop();
  66 }
  67
  68 Map & ClientEnvironment::getMap()
  69 {
  70         return *m_map;
  71 }
  72
  73 ClientMap & ClientEnvironment::getClientMap()
  74 {
  75         return *m_map;
  76 }
  77
  78 void ClientEnvironment::setLocalPlayer(LocalPlayer *player)
  79 {
  80         DSTACK(FUNCTION_NAME);
  81         /*
  82                 It is a failure if already is a local player
  83         */
  84         FATAL_ERROR_IF(m_local_player != NULL,
  85                 "Local player already allocated");
  86
  87         m_local_player = player;
  88 }
  89
  90 void ClientEnvironment::step(float dtime)
  91 {
  92         DSTACK(FUNCTION_NAME);
  93
  94         /* Step time of day */
  95         stepTimeOfDay(dtime);
  96
  97         // Get some settings
  98         bool fly_allowed = m_client->checkLocalPrivilege("fly");
  99         bool free_move = fly_allowed && g_settings->getBool("free_move");
 100
 101         // Get local player
 102         LocalPlayer *lplayer = getLocalPlayer();
 103         assert(lplayer);
 104         // collision info queue
 105         std::vector<CollisionInfo> player_collisions;
 106
 107         /*
 108                 Get the speed the player is going
 109         */
 110         bool is_climbing = lplayer->is_climbing;
 111
 112         f32 player_speed = lplayer->getSpeed().getLength();
 113
 114         /*
 115                 Maximum position increment
 116         */
 117         //f32 position_max_increment = 0.05*BS;
 118         f32 position_max_increment = 0.1*BS;
 119
 120         // Maximum time increment (for collision detection etc)
 121         // time = distance / speed
 122         f32 dtime_max_increment = 1;
 123         if(player_speed > 0.001)
 124                 dtime_max_increment = position_max_increment / player_speed;
 125
 126         // Maximum time increment is 10ms or lower
 127         if(dtime_max_increment > 0.01)
 128                 dtime_max_increment = 0.01;
 129
 130         // Don't allow overly huge dtime
 131         if(dtime > 0.5)
 132                 dtime = 0.5;
 133
 134         f32 dtime_downcount = dtime;
 135
 136         /*
 137                 Stuff that has a maximum time increment
 138         */
 139
 140         u32 loopcount = 0;
 141         do
 142         {
 143                 loopcount++;
 144
 145                 f32 dtime_part;
 146                 if(dtime_downcount > dtime_max_increment)
 147                 {
 148                         dtime_part = dtime_max_increment;
 149                         dtime_downcount -= dtime_part;
 150                 }
 151                 else
 152                 {
 153                         dtime_part = dtime_downcount;
 154                         /*
 155                                 Setting this to 0 (no -=dtime_part) disables an infinite loop
 156                                 when dtime_part is so small that dtime_downcount -= dtime_part
 157                                 does nothing
 158                         */
 159                         dtime_downcount = 0;
 160                 }
 161
 162                 /*
 163                         Handle local player
 164                 */
 165
 166                 {
 167                         // Apply physics
 168                         if(!free_move && !is_climbing)
 169                         {
 170                                 // Gravity
 171                                 v3f speed = lplayer->getSpeed();
 172                                 if(!lplayer->in_liquid)
 173                                         speed.Y -= lplayer->movement_gravity * lplayer->physics_override_gravity * dtime_part * 2;
 174
 175                                 // Liquid floating / sinking
 176                                 if(lplayer->in_liquid && !lplayer->swimming_vertical)
 177                                         speed.Y -= lplayer->movement_liquid_sink * dtime_part * 2;
 178
 179                                 // Liquid resistance
 180                                 if(lplayer->in_liquid_stable || lplayer->in_liquid)
 181                                 {
 182                                         // How much the node's viscosity blocks movement, ranges between 0 and 1
 183                                         // Should match the scale at which viscosity increase affects other liquid attributes
 184                                         const f32 viscosity_factor = 0.3;
 185
 186                                         v3f d_wanted = -speed / lplayer->movement_liquid_fluidity;
 187                                         f32 dl = d_wanted.getLength();
 188                                         if(dl > lplayer->movement_liquid_fluidity_smooth)
 189                                                 dl = lplayer->movement_liquid_fluidity_smooth;
 190                                         dl *= (lplayer->liquid_viscosity * viscosity_factor) + (1 - viscosity_factor);
 191
 192                                         v3f d = d_wanted.normalize() * dl;
 193                                         speed += d;
 194                                 }
 195
 196                                 lplayer->setSpeed(speed);
 197                         }
 198
 199                         /*
 200                                 Move the lplayer.
 201                                 This also does collision detection.
 202                         */
 203                         lplayer->move(dtime_part, this, position_max_increment,
 204                                 &player_collisions);
 205                 }
 206         }
 207         while(dtime_downcount > 0.001);
 208
 209         //std::cout<<"Looped "<<loopcount<<" times."<<std::endl;
 210
 211         for(std::vector<CollisionInfo>::iterator i = player_collisions.begin();
 212                 i != player_collisions.end(); ++i) {
 213                 CollisionInfo &info = *i;
 214                 v3f speed_diff = info.new_speed - info.old_speed;;
 215                 // Handle only fall damage
 216                 // (because otherwise walking against something in fast_move kills you)
 217                 if(speed_diff.Y < 0 || info.old_speed.Y >= 0)
 218                         continue;
 219                 // Get rid of other components
 220                 speed_diff.X = 0;
 221                 speed_diff.Z = 0;
 222                 f32 pre_factor = 1; // 1 hp per node/s
 223                 f32 tolerance = BS*14; // 5 without damage
 224                 f32 post_factor = 1; // 1 hp per node/s
 225                 if(info.type == COLLISION_NODE)
 226                 {
 227                         const ContentFeatures &f = m_client->ndef()->
 228                                 get(m_map->getNodeNoEx(info.node_p));
 229                         // Determine fall damage multiplier
 230                         int addp = itemgroup_get(f.groups, "fall_damage_add_percent");
 231                         pre_factor = 1.0 + (float)addp/100.0;
 232                 }
 233                 float speed = pre_factor * speed_diff.getLength();
 234                 if(speed > tolerance)
 235                 {
 236                         f32 damage_f = (speed - tolerance)/BS * post_factor;
 237                         u16 damage = (u16)(damage_f+0.5);
 238                         if(damage != 0){
 239                                 damageLocalPlayer(damage, true);
 240                                 MtEvent *e = new SimpleTriggerEvent("PlayerFallingDamage");
 241                                 m_client->event()->put(e);
 242                         }
 243                 }
 244         }
 245
 246         /*
 247                 A quick draft of lava damage
 248         */
 249         if(m_lava_hurt_interval.step(dtime, 1.0))
 250         {
 251                 v3f pf = lplayer->getPosition();
 252
 253                 // Feet, middle and head
 254                 v3s16 p1 = floatToInt(pf + v3f(0, BS*0.1, 0), BS);
 255                 MapNode n1 = m_map->getNodeNoEx(p1);
 256                 v3s16 p2 = floatToInt(pf + v3f(0, BS*0.8, 0), BS);
 257                 MapNode n2 = m_map->getNodeNoEx(p2);
 258                 v3s16 p3 = floatToInt(pf + v3f(0, BS*1.6, 0), BS);
 259                 MapNode n3 = m_map->getNodeNoEx(p3);
 260
 261                 u32 damage_per_second = 0;
 262                 damage_per_second = MYMAX(damage_per_second,
 263                         m_client->ndef()->get(n1).damage_per_second);
 264                 damage_per_second = MYMAX(damage_per_second,
 265                         m_client->ndef()->get(n2).damage_per_second);
 266                 damage_per_second = MYMAX(damage_per_second,
 267                         m_client->ndef()->get(n3).damage_per_second);
 268
 269                 if(damage_per_second != 0)
 270                 {
 271                         damageLocalPlayer(damage_per_second, true);
 272                 }
 273         }
 274
 275         // Protocol v29 make this behaviour obsolete
 276         if (getGameDef()->getProtoVersion() < 29) {
 277                 /*
 278                         Drowning
 279                 */
 280                 if (m_drowning_interval.step(dtime, 2.0)) {
 281                         v3f pf = lplayer->getPosition();
 282
 283                         // head
 284                         v3s16 p = floatToInt(pf + v3f(0, BS * 1.6, 0), BS);
 285                         MapNode n = m_map->getNodeNoEx(p);
 286                         ContentFeatures c = m_client->ndef()->get(n);
 287                         u8 drowning_damage = c.drowning;
 288                         if (drowning_damage > 0 && lplayer->hp > 0) {
 289                                 u16 breath = lplayer->getBreath();
 290                                 if (breath > 10) {
 291                                         breath = 11;
 292                                 }
 293                                 if (breath > 0) {
 294                                         breath -= 1;
 295                                 }
 296                                 lplayer->setBreath(breath);
 297                                 updateLocalPlayerBreath(breath);
 298                         }
 299
 300                         if (lplayer->getBreath() == 0 && drowning_damage > 0) {
 301                                 damageLocalPlayer(drowning_damage, true);
 302                         }
 303                 }
 304                 if (m_breathing_interval.step(dtime, 0.5)) {
 305                         v3f pf = lplayer->getPosition();
 306
 307                         // head
 308                         v3s16 p = floatToInt(pf + v3f(0, BS * 1.6, 0), BS);
 309                         MapNode n = m_map->getNodeNoEx(p);
 310                         ContentFeatures c = m_client->ndef()->get(n);
 311                         if (!lplayer->hp) {
 312                                 lplayer->setBreath(11);
 313                         } else if (c.drowning == 0) {
 314                                 u16 breath = lplayer->getBreath();
 315                                 if (breath <= 10) {
 316                                         breath += 1;
 317                                         lplayer->setBreath(breath);
 318                                         updateLocalPlayerBreath(breath);
 319                                 }
 320                         }
 321                 }
 322         }
 323
 324         // Update lighting on local player (used for wield item)
 325         u32 day_night_ratio = getDayNightRatio();
 326         {
 327                 // Get node at head
 328
 329                 // On InvalidPositionException, use this as default
 330                 // (day: LIGHT_SUN, night: 0)
 331                 MapNode node_at_lplayer(CONTENT_AIR, 0x0f, 0);
 332
 333                 v3s16 p = lplayer->getLightPosition();
 334                 node_at_lplayer = m_map->getNodeNoEx(p);
 335
 336                 u16 light = getInteriorLight(node_at_lplayer, 0, m_client->ndef());
 337                 final_color_blend(&lplayer->light_color, light, day_night_ratio);
 338         }
 339
 340         /*
 341                 Step active objects and update lighting of them
 342         */
 343
 344         g_profiler->avg("CEnv: num of objects", m_active_objects.size());
 345         bool update_lighting = m_active_object_light_update_interval.step(dtime, 0.21);
 346         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
 347                 i != m_active_objects.end(); ++i) {
 348                 ClientActiveObject* obj = i->second;
 349                 // Step object
 350                 obj->step(dtime, this);
 351
 352                 if(update_lighting)
 353                 {
 354                         // Update lighting
 355                         u8 light = 0;
 356                         bool pos_ok;
 357
 358                         // Get node at head
 359                         v3s16 p = obj->getLightPosition();
 360                         MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 361                         if (pos_ok)
 362                                 light = n.getLightBlend(day_night_ratio, m_client->ndef());
 363                         else
 364                                 light = blend_light(day_night_ratio, LIGHT_SUN, 0);
 365
 366                         obj->updateLight(light);
 367                 }
 368         }
 369
 370         /*
 371                 Step and handle simple objects
 372         */
 373         g_profiler->avg("CEnv: num of simple objects", m_simple_objects.size());
 374         for(std::vector<ClientSimpleObject*>::iterator
 375                 i = m_simple_objects.begin(); i != m_simple_objects.end();) {
 376                 std::vector<ClientSimpleObject*>::iterator cur = i;
 377                 ClientSimpleObject *simple = *cur;
 378
 379                 simple->step(dtime);
 380                 if(simple->m_to_be_removed) {
 381                         delete simple;
 382                         i = m_simple_objects.erase(cur);
 383                 }
 384                 else {
 385                         ++i;
 386                 }
 387         }
 388 }
 389
 390 void ClientEnvironment::addSimpleObject(ClientSimpleObject *simple)
 391 {
 392         m_simple_objects.push_back(simple);
 393 }
 394
 395 GenericCAO* ClientEnvironment::getGenericCAO(u16 id)
 396 {
 397         ClientActiveObject *obj = getActiveObject(id);
 398         if (obj && obj->getType() == ACTIVEOBJECT_TYPE_GENERIC)
 399                 return (GenericCAO*) obj;
 400         else
 401                 return NULL;
 402 }
 403
 404 ClientActiveObject* ClientEnvironment::getActiveObject(u16 id)
 405 {
 406         UNORDERED_MAP<u16, ClientActiveObject*>::iterator n = m_active_objects.find(id);
 407         if (n == m_active_objects.end())
 408                 return NULL;
 409         return n->second;
 410 }
 411
 412 bool isFreeClientActiveObjectId(const u16 id,
 413         UNORDERED_MAP<u16, ClientActiveObject*> &objects)
 414 {
 415         if(id == 0)
 416                 return false;
 417
 418         return objects.find(id) == objects.end();
 419 }
 420
 421 u16 getFreeClientActiveObjectId(UNORDERED_MAP<u16, ClientActiveObject*> &objects)
 422 {
 423         //try to reuse id's as late as possible
 424         static u16 last_used_id = 0;
 425         u16 startid = last_used_id;
 426         for(;;) {
 427                 last_used_id ++;
 428                 if (isFreeClientActiveObjectId(last_used_id, objects))
 429                         return last_used_id;
 430
 431                 if (last_used_id == startid)
 432                         return 0;
 433         }
 434 }
 435
 436 u16 ClientEnvironment::addActiveObject(ClientActiveObject *object)
 437 {
 438         assert(object); // Pre-condition
 439         if(object->getId() == 0)
 440         {
 441                 u16 new_id = getFreeClientActiveObjectId(m_active_objects);
 442                 if(new_id == 0)
 443                 {
 444                         infostream<<"ClientEnvironment::addActiveObject(): "
 445                                 <<"no free ids available"<<std::endl;
 446                         delete object;
 447                         return 0;
 448                 }
 449                 object->setId(new_id);
 450         }
 451         if (!isFreeClientActiveObjectId(object->getId(), m_active_objects)) {
 452                 infostream<<"ClientEnvironment::addActiveObject(): "
 453                         <<"id is not free ("<<object->getId()<<")"<<std::endl;
 454                 delete object;
 455                 return 0;
 456         }
 457         infostream<<"ClientEnvironment::addActiveObject(): "
 458                 <<"added (id="<<object->getId()<<")"<<std::endl;
 459         m_active_objects[object->getId()] = object;
 460         object->addToScene(m_smgr, m_texturesource, m_irr);
 461         { // Update lighting immediately
 462                 u8 light = 0;
 463                 bool pos_ok;
 464
 465                 // Get node at head
 466                 v3s16 p = object->getLightPosition();
 467                 MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 468                 if (pos_ok)
 469                         light = n.getLightBlend(getDayNightRatio(), m_client->ndef());
 470                 else
 471                         light = blend_light(getDayNightRatio(), LIGHT_SUN, 0);
 472
 473                 object->updateLight(light);
 474         }
 475         return object->getId();
 476 }
 477
 478 void ClientEnvironment::addActiveObject(u16 id, u8 type,
 479         const std::string &init_data)
 480 {
 481         ClientActiveObject* obj =
 482                 ClientActiveObject::create((ActiveObjectType) type, m_client, this);
 483         if(obj == NULL)
 484         {
 485                 infostream<<"ClientEnvironment::addActiveObject(): "
 486                         <<"id="<<id<<" type="<<type<<": Couldn't create object"
 487                         <<std::endl;
 488                 return;
 489         }
 490
 491         obj->setId(id);
 492
 493         try
 494         {
 495                 obj->initialize(init_data);
 496         }
 497         catch(SerializationError &e)
 498         {
 499                 errorstream<<"ClientEnvironment::addActiveObject():"
 500                         <<" id="<<id<<" type="<<type
 501                         <<": SerializationError in initialize(): "
 502                         <<e.what()
 503                         <<": init_data="<<serializeJsonString(init_data)
 504                         <<std::endl;
 505         }
 506
 507         addActiveObject(obj);
 508 }
 509
 510 void ClientEnvironment::removeActiveObject(u16 id)
 511 {
 512         verbosestream<<"ClientEnvironment::removeActiveObject(): "
 513                 <<"id="<<id<<std::endl;
 514         ClientActiveObject* obj = getActiveObject(id);
 515         if (obj == NULL) {
 516                 infostream<<"ClientEnvironment::removeActiveObject(): "
 517                         <<"id="<<id<<" not found"<<std::endl;
 518                 return;
 519         }
 520         obj->removeFromScene(true);
 521         delete obj;
 522         m_active_objects.erase(id);
 523 }
 524
 525 void ClientEnvironment::processActiveObjectMessage(u16 id, const std::string &data)
 526 {
 527         ClientActiveObject *obj = getActiveObject(id);
 528         if (obj == NULL) {
 529                 infostream << "ClientEnvironment::processActiveObjectMessage():"
 530                         << " got message for id=" << id << ", which doesn't exist."
 531                         << std::endl;
 532                 return;
 533         }
 534
 535         try {
 536                 obj->processMessage(data);
 537         } catch (SerializationError &e) {
 538                 errorstream<<"ClientEnvironment::processActiveObjectMessage():"
 539                         << " id=" << id << " type=" << obj->getType()
 540                         << " SerializationError in processMessage(): " << e.what()
 541                         << std::endl;
 542         }
 543 }
 544
 545 /*
 546         Callbacks for activeobjects
 547 */
 548
 549 void ClientEnvironment::damageLocalPlayer(u8 damage, bool handle_hp)
 550 {
 551         LocalPlayer *lplayer = getLocalPlayer();
 552         assert(lplayer);
 553
 554         if (handle_hp) {
 555                 if (lplayer->hp > damage)
 556                         lplayer->hp -= damage;
 557                 else
 558                         lplayer->hp = 0;
 559         }
 560
 561         ClientEnvEvent event;
 562         event.type = CEE_PLAYER_DAMAGE;
 563         event.player_damage.amount = damage;
 564         event.player_damage.send_to_server = handle_hp;
 565         m_client_event_queue.push(event);
 566 }
 567
 568 void ClientEnvironment::updateLocalPlayerBreath(u16 breath)
 569 {
 570         ClientEnvEvent event;
 571         event.type = CEE_PLAYER_BREATH;
 572         event.player_breath.amount = breath;
 573         m_client_event_queue.push(event);
 574 }
 575
 576 /*
 577         Client likes to call these
 578 */
 579
 580 void ClientEnvironment::getActiveObjects(v3f origin, f32 max_d,
 581         std::vector<DistanceSortedActiveObject> &dest)
 582 {
 583         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
 584                 i != m_active_objects.end(); ++i) {
 585                 ClientActiveObject* obj = i->second;
 586
 587                 f32 d = (obj->getPosition() - origin).getLength();
 588
 589                 if(d > max_d)
 590                         continue;
 591
 592                 DistanceSortedActiveObject dso(obj, d);
 593
 594                 dest.push_back(dso);
 595         }
 596 }
 597
 598 ClientEnvEvent ClientEnvironment::getClientEvent()
 599 {
 600         ClientEnvEvent event;
 601         if(m_client_event_queue.empty())
 602                 event.type = CEE_NONE;
 603         else {
 604                 event = m_client_event_queue.front();
 605                 m_client_event_queue.pop();
 606         }
 607         return event;
 608 }
 609
 610 ClientActiveObject * ClientEnvironment::getSelectedActiveObject(
 611         const core::line3d<f32> &shootline_on_map, v3f *intersection_point,
 612         v3s16 *intersection_normal)
 613 {
 614         std::vector<DistanceSortedActiveObject> objects;
 615         getActiveObjects(shootline_on_map.start,
 616                 shootline_on_map.getLength() + 3, objects);
 617         const v3f line_vector = shootline_on_map.getVector();
 618
 619         // Sort them.
 620         // After this, the closest object is the first in the array.
 621         std::sort(objects.begin(), objects.end());
 622
 623         /* Because objects can have different nodebox sizes,
 624          * the object whose center is the nearest isn't necessarily
 625          * the closest one. If an object is found, don't stop
 626          * immediately. */
 627
 628         f32 d_min = shootline_on_map.getLength();
 629         ClientActiveObject *nearest_obj = NULL;
 630         for (u32 i = 0; i < objects.size(); i++) {
 631                 ClientActiveObject *obj = objects[i].obj;
 632
 633                 aabb3f *selection_box = obj->getSelectionBox();
 634                 if (selection_box == NULL)
 635                         continue;
 636
 637                 v3f pos = obj->getPosition();
 638
 639                 aabb3f offsetted_box(selection_box->MinEdge + pos,
 640                         selection_box->MaxEdge + pos);
 641
 642                 if (offsetted_box.getCenter().getDistanceFrom(
 643                         shootline_on_map.start) > d_min + 9.6f*BS) {
 644                         // Probably there is no active object that has bigger nodebox than
 645                         // (-5.5,-5.5,-5.5,5.5,5.5,5.5)
 646                         // 9.6 > 5.5*sqrt(3)
 647                         break;
 648                 }
 649
 650                 v3f current_intersection;
 651                 v3s16 current_normal;
 652                 if (boxLineCollision(offsetted_box, shootline_on_map.start, line_vector,
 653                         &current_intersection, &current_normal)) {
 654                         f32 d_current = current_intersection.getDistanceFrom(
 655                                 shootline_on_map.start);
 656                         if (d_current <= d_min) {
 657                                 d_min = d_current;
 658                                 nearest_obj = obj;
 659                                 *intersection_point = current_intersection;
 660                                 *intersection_normal = current_normal;
 661                         }
 662                 }
 663         }
 664
 665         return nearest_obj;
 666 }
 667
 668 /*
 669         Check if a node is pointable
 670 */
 671 static inline bool isPointableNode(const MapNode &n,
 672         INodeDefManager *ndef, bool liquids_pointable)
 673 {
 674         const ContentFeatures &features = ndef->get(n);
 675         return features.pointable ||
 676                 (liquids_pointable && features.isLiquid());
 677 }
 678
 679 PointedThing ClientEnvironment::getPointedThing(
 680         core::line3d<f32> shootline,
 681         bool liquids_pointable,
 682         bool look_for_object)
 683 {
 684         PointedThing result;
 685
 686         INodeDefManager *nodedef = m_map->getNodeDefManager();
 687
 688         core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 689         // The code needs to search these nodes
 690         core::aabbox3d<s16> search_range(-maximal_exceed.MaxEdge,
 691                 -maximal_exceed.MinEdge);
 692         // If a node is found, there might be a larger node behind.
 693         // To find it, we have to go further.
 694         s16 maximal_overcheck =
 695                 std::max(abs(search_range.MinEdge.X), abs(search_range.MaxEdge.X))
 696                         + std::max(abs(search_range.MinEdge.Y), abs(search_range.MaxEdge.Y))
 697                         + std::max(abs(search_range.MinEdge.Z), abs(search_range.MaxEdge.Z));
 698
 699         const v3f original_vector = shootline.getVector();
 700         const f32 original_length = original_vector.getLength();
 701
 702         f32 min_distance = original_length;
 703
 704         // First try to find an active object
 705         if (look_for_object) {
 706                 ClientActiveObject *selected_object = getSelectedActiveObject(
 707                         shootline, &result.intersection_point,
 708                         &result.intersection_normal);
 709
 710                 if (selected_object != NULL) {
 711                         min_distance =
 712                                 (result.intersection_point - shootline.start).getLength();
 713
 714                         result.type = POINTEDTHING_OBJECT;
 715                         result.object_id = selected_object->getId();
 716                 }
 717         }
 718
 719         // Reduce shootline
 720         if (original_length > 0) {
 721                 shootline.end = shootline.start
 722                         + shootline.getVector() / original_length * min_distance;
 723         }
 724
 725         // Try to find a node that is closer than the selected active
 726         // object (if it exists).
 727
 728         voxalgo::VoxelLineIterator iterator(shootline.start / BS,
 729                 shootline.getVector() / BS);
 730         v3s16 oldnode = iterator.m_current_node_pos;
 731         // Indicates that a node was found.
 732         bool is_node_found = false;
 733         // If a node is found, it is possible that there's a node
 734         // behind it with a large nodebox, so continue the search.
 735         u16 node_foundcounter = 0;
 736         // If a node is found, this is the center of the
 737         // first nodebox the shootline meets.
 738         v3f found_boxcenter(0, 0, 0);
 739         // The untested nodes are in this range.
 740         core::aabbox3d<s16> new_nodes;
 741         while (true) {
 742                 // Test the nodes around the current node in search_range.
 743                 new_nodes = search_range;
 744                 new_nodes.MinEdge += iterator.m_current_node_pos;
 745                 new_nodes.MaxEdge += iterator.m_current_node_pos;
 746
 747                 // Only check new nodes
 748                 v3s16 delta = iterator.m_current_node_pos - oldnode;
 749                 if (delta.X > 0)
 750                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 751                 else if (delta.X < 0)
 752                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 753                 else if (delta.Y > 0)
 754                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 755                 else if (delta.Y < 0)
 756                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 757                 else if (delta.Z > 0)
 758                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 759                 else if (delta.Z < 0)
 760                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 761
 762                 // For each untested node
 763                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++) {
 764                         for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++) {
 765                                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 766                                         MapNode n;
 767                                         v3s16 np(x, y, z);
 768                                         bool is_valid_position;
 769
 770                                         n = m_map->getNodeNoEx(np, &is_valid_position);
 771                                         if (!(is_valid_position &&
 772                                                 isPointableNode(n, nodedef, liquids_pointable))) {
 773                                                 continue;
 774                                         }
 775                                         std::vector<aabb3f> boxes;
 776                                         n.getSelectionBoxes(nodedef, &boxes,
 777                                                 n.getNeighbors(np, m_map));
 778
 779                                         v3f npf = intToFloat(np, BS);
 780                                         for (std::vector<aabb3f>::const_iterator i = boxes.begin();
 781                                                 i != boxes.end(); ++i) {
 782                                                 aabb3f box = *i;
 783                                                 box.MinEdge += npf;
 784                                                 box.MaxEdge += npf;
 785                                                 v3f intersection_point;
 786                                                 v3s16 intersection_normal;
 787                                                 if (!boxLineCollision(box, shootline.start, shootline.getVector(),
 788                                                         &intersection_point, &intersection_normal)) {
 789                                                         continue;
 790                                                 }
 791                                                 f32 distance = (intersection_point - shootline.start).getLength();
 792                                                 if (distance >= min_distance) {
 793                                                         continue;
 794                                                 }
 795                                                 result.type = POINTEDTHING_NODE;
 796                                                 result.node_undersurface = np;
 797                                                 result.intersection_point = intersection_point;
 798                                                 result.intersection_normal = intersection_normal;
 799                                                 found_boxcenter = box.getCenter();
 800                                                 min_distance = distance;
 801                                                 is_node_found = true;
 802                                         }
 803                                 }
 804                         }
 805                 }
 806                 if (is_node_found) {
 807                         node_foundcounter++;
 808                         if (node_foundcounter > maximal_overcheck) {
 809                                 break;
 810                         }
 811                 }
 812                 // Next node
 813                 if (iterator.hasNext()) {
 814                         oldnode = iterator.m_current_node_pos;
 815                         iterator.next();
 816                 } else {
 817                         break;
 818                 }
 819         }
 820
 821         if (is_node_found) {
 822                 // Set undersurface and abovesurface nodes
 823                 f32 d = 0.002 * BS;
 824                 v3f fake_intersection = result.intersection_point;
 825                 // Move intersection towards its source block.
 826                 if (fake_intersection.X < found_boxcenter.X)
 827                         fake_intersection.X += d;
 828                 else
 829                         fake_intersection.X -= d;
 830
 831                 if (fake_intersection.Y < found_boxcenter.Y)
 832                         fake_intersection.Y += d;
 833                 else
 834                         fake_intersection.Y -= d;
 835
 836                 if (fake_intersection.Z < found_boxcenter.Z)
 837                         fake_intersection.Z += d;
 838                 else
 839                         fake_intersection.Z -= d;
 840
 841                 result.node_real_undersurface = floatToInt(fake_intersection, BS);
 842                 result.node_abovesurface = result.node_real_undersurface
 843                         + result.intersection_normal;
 844         }
 845         return result;
 846 }