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
  32 /*
  33         ClientEnvironment
  34 */
  35
  36 ClientEnvironment::ClientEnvironment(ClientMap *map, scene::ISceneManager *smgr,
  37         ITextureSource *texturesource, Client *client,
  38         IrrlichtDevice *irr):
  39         m_map(map),
  40         m_local_player(NULL),
  41         m_smgr(smgr),
  42         m_texturesource(texturesource),
  43         m_client(client),
  44         m_irr(irr)
  45 {
  46         char zero = 0;
  47         memset(attachement_parent_ids, zero, sizeof(attachement_parent_ids));
  48 }
  49
  50 ClientEnvironment::~ClientEnvironment()
  51 {
  52         // delete active objects
  53         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
  54                 i != m_active_objects.end(); ++i) {
  55                 delete i->second;
  56         }
  57
  58         for(std::vector<ClientSimpleObject*>::iterator
  59                 i = m_simple_objects.begin(); i != m_simple_objects.end(); ++i) {
  60                 delete *i;
  61         }
  62
  63         // Drop/delete map
  64         m_map->drop();
  65 }
  66
  67 Map & ClientEnvironment::getMap()
  68 {
  69         return *m_map;
  70 }
  71
  72 ClientMap & ClientEnvironment::getClientMap()
  73 {
  74         return *m_map;
  75 }
  76
  77 void ClientEnvironment::setLocalPlayer(LocalPlayer *player)
  78 {
  79         DSTACK(FUNCTION_NAME);
  80         /*
  81                 It is a failure if already is a local player
  82         */
  83         FATAL_ERROR_IF(m_local_player != NULL,
  84                 "Local player already allocated");
  85
  86         m_local_player = player;
  87 }
  88
  89 void ClientEnvironment::step(float dtime)
  90 {
  91         DSTACK(FUNCTION_NAME);
  92
  93         /* Step time of day */
  94         stepTimeOfDay(dtime);
  95
  96         // Get some settings
  97         bool fly_allowed = m_client->checkLocalPrivilege("fly");
  98         bool free_move = fly_allowed && g_settings->getBool("free_move");
  99
 100         // Get local player
 101         LocalPlayer *lplayer = getLocalPlayer();
 102         assert(lplayer);
 103         // collision info queue
 104         std::vector<CollisionInfo> player_collisions;
 105
 106         /*
 107                 Get the speed the player is going
 108         */
 109         bool is_climbing = lplayer->is_climbing;
 110
 111         f32 player_speed = lplayer->getSpeed().getLength();
 112
 113         /*
 114                 Maximum position increment
 115         */
 116         //f32 position_max_increment = 0.05*BS;
 117         f32 position_max_increment = 0.1*BS;
 118
 119         // Maximum time increment (for collision detection etc)
 120         // time = distance / speed
 121         f32 dtime_max_increment = 1;
 122         if(player_speed > 0.001)
 123                 dtime_max_increment = position_max_increment / player_speed;
 124
 125         // Maximum time increment is 10ms or lower
 126         if(dtime_max_increment > 0.01)
 127                 dtime_max_increment = 0.01;
 128
 129         // Don't allow overly huge dtime
 130         if(dtime > 0.5)
 131                 dtime = 0.5;
 132
 133         f32 dtime_downcount = dtime;
 134
 135         /*
 136                 Stuff that has a maximum time increment
 137         */
 138
 139         u32 loopcount = 0;
 140         do
 141         {
 142                 loopcount++;
 143
 144                 f32 dtime_part;
 145                 if(dtime_downcount > dtime_max_increment)
 146                 {
 147                         dtime_part = dtime_max_increment;
 148                         dtime_downcount -= dtime_part;
 149                 }
 150                 else
 151                 {
 152                         dtime_part = dtime_downcount;
 153                         /*
 154                                 Setting this to 0 (no -=dtime_part) disables an infinite loop
 155                                 when dtime_part is so small that dtime_downcount -= dtime_part
 156                                 does nothing
 157                         */
 158                         dtime_downcount = 0;
 159                 }
 160
 161                 /*
 162                         Handle local player
 163                 */
 164
 165                 {
 166                         // Apply physics
 167                         if(!free_move && !is_climbing)
 168                         {
 169                                 // Gravity
 170                                 v3f speed = lplayer->getSpeed();
 171                                 if(!lplayer->in_liquid)
 172                                         speed.Y -= lplayer->movement_gravity * lplayer->physics_override_gravity * dtime_part * 2;
 173
 174                                 // Liquid floating / sinking
 175                                 if(lplayer->in_liquid && !lplayer->swimming_vertical)
 176                                         speed.Y -= lplayer->movement_liquid_sink * dtime_part * 2;
 177
 178                                 // Liquid resistance
 179                                 if(lplayer->in_liquid_stable || lplayer->in_liquid)
 180                                 {
 181                                         // How much the node's viscosity blocks movement, ranges between 0 and 1
 182                                         // Should match the scale at which viscosity increase affects other liquid attributes
 183                                         const f32 viscosity_factor = 0.3;
 184
 185                                         v3f d_wanted = -speed / lplayer->movement_liquid_fluidity;
 186                                         f32 dl = d_wanted.getLength();
 187                                         if(dl > lplayer->movement_liquid_fluidity_smooth)
 188                                                 dl = lplayer->movement_liquid_fluidity_smooth;
 189                                         dl *= (lplayer->liquid_viscosity * viscosity_factor) + (1 - viscosity_factor);
 190
 191                                         v3f d = d_wanted.normalize() * dl;
 192                                         speed += d;
 193                                 }
 194
 195                                 lplayer->setSpeed(speed);
 196                         }
 197
 198                         /*
 199                                 Move the lplayer.
 200                                 This also does collision detection.
 201                         */
 202                         lplayer->move(dtime_part, this, position_max_increment,
 203                                 &player_collisions);
 204                 }
 205         }
 206         while(dtime_downcount > 0.001);
 207
 208         //std::cout<<"Looped "<<loopcount<<" times."<<std::endl;
 209
 210         for(std::vector<CollisionInfo>::iterator i = player_collisions.begin();
 211                 i != player_collisions.end(); ++i) {
 212                 CollisionInfo &info = *i;
 213                 v3f speed_diff = info.new_speed - info.old_speed;;
 214                 // Handle only fall damage
 215                 // (because otherwise walking against something in fast_move kills you)
 216                 if(speed_diff.Y < 0 || info.old_speed.Y >= 0)
 217                         continue;
 218                 // Get rid of other components
 219                 speed_diff.X = 0;
 220                 speed_diff.Z = 0;
 221                 f32 pre_factor = 1; // 1 hp per node/s
 222                 f32 tolerance = BS*14; // 5 without damage
 223                 f32 post_factor = 1; // 1 hp per node/s
 224                 if(info.type == COLLISION_NODE)
 225                 {
 226                         const ContentFeatures &f = m_client->ndef()->
 227                                 get(m_map->getNodeNoEx(info.node_p));
 228                         // Determine fall damage multiplier
 229                         int addp = itemgroup_get(f.groups, "fall_damage_add_percent");
 230                         pre_factor = 1.0 + (float)addp/100.0;
 231                 }
 232                 float speed = pre_factor * speed_diff.getLength();
 233                 if(speed > tolerance)
 234                 {
 235                         f32 damage_f = (speed - tolerance)/BS * post_factor;
 236                         u16 damage = (u16)(damage_f+0.5);
 237                         if(damage != 0){
 238                                 damageLocalPlayer(damage, true);
 239                                 MtEvent *e = new SimpleTriggerEvent("PlayerFallingDamage");
 240                                 m_client->event()->put(e);
 241                         }
 242                 }
 243         }
 244
 245         /*
 246                 A quick draft of lava damage
 247         */
 248         if(m_lava_hurt_interval.step(dtime, 1.0))
 249         {
 250                 v3f pf = lplayer->getPosition();
 251
 252                 // Feet, middle and head
 253                 v3s16 p1 = floatToInt(pf + v3f(0, BS*0.1, 0), BS);
 254                 MapNode n1 = m_map->getNodeNoEx(p1);
 255                 v3s16 p2 = floatToInt(pf + v3f(0, BS*0.8, 0), BS);
 256                 MapNode n2 = m_map->getNodeNoEx(p2);
 257                 v3s16 p3 = floatToInt(pf + v3f(0, BS*1.6, 0), BS);
 258                 MapNode n3 = m_map->getNodeNoEx(p3);
 259
 260                 u32 damage_per_second = 0;
 261                 damage_per_second = MYMAX(damage_per_second,
 262                         m_client->ndef()->get(n1).damage_per_second);
 263                 damage_per_second = MYMAX(damage_per_second,
 264                         m_client->ndef()->get(n2).damage_per_second);
 265                 damage_per_second = MYMAX(damage_per_second,
 266                         m_client->ndef()->get(n3).damage_per_second);
 267
 268                 if(damage_per_second != 0)
 269                 {
 270                         damageLocalPlayer(damage_per_second, true);
 271                 }
 272         }
 273
 274         // Protocol v29 make this behaviour obsolete
 275         if (getGameDef()->getProtoVersion() < 29) {
 276                 /*
 277                         Drowning
 278                 */
 279                 if (m_drowning_interval.step(dtime, 2.0)) {
 280                         v3f pf = lplayer->getPosition();
 281
 282                         // head
 283                         v3s16 p = floatToInt(pf + v3f(0, BS * 1.6, 0), BS);
 284                         MapNode n = m_map->getNodeNoEx(p);
 285                         ContentFeatures c = m_client->ndef()->get(n);
 286                         u8 drowning_damage = c.drowning;
 287                         if (drowning_damage > 0 && lplayer->hp > 0) {
 288                                 u16 breath = lplayer->getBreath();
 289                                 if (breath > 10) {
 290                                         breath = 11;
 291                                 }
 292                                 if (breath > 0) {
 293                                         breath -= 1;
 294                                 }
 295                                 lplayer->setBreath(breath);
 296                                 updateLocalPlayerBreath(breath);
 297                         }
 298
 299                         if (lplayer->getBreath() == 0 && drowning_damage > 0) {
 300                                 damageLocalPlayer(drowning_damage, true);
 301                         }
 302                 }
 303                 if (m_breathing_interval.step(dtime, 0.5)) {
 304                         v3f pf = lplayer->getPosition();
 305
 306                         // head
 307                         v3s16 p = floatToInt(pf + v3f(0, BS * 1.6, 0), BS);
 308                         MapNode n = m_map->getNodeNoEx(p);
 309                         ContentFeatures c = m_client->ndef()->get(n);
 310                         if (!lplayer->hp) {
 311                                 lplayer->setBreath(11);
 312                         } else if (c.drowning == 0) {
 313                                 u16 breath = lplayer->getBreath();
 314                                 if (breath <= 10) {
 315                                         breath += 1;
 316                                         lplayer->setBreath(breath);
 317                                         updateLocalPlayerBreath(breath);
 318                                 }
 319                         }
 320                 }
 321         }
 322
 323         // Update lighting on local player (used for wield item)
 324         u32 day_night_ratio = getDayNightRatio();
 325         {
 326                 // Get node at head
 327
 328                 // On InvalidPositionException, use this as default
 329                 // (day: LIGHT_SUN, night: 0)
 330                 MapNode node_at_lplayer(CONTENT_AIR, 0x0f, 0);
 331
 332                 v3s16 p = lplayer->getLightPosition();
 333                 node_at_lplayer = m_map->getNodeNoEx(p);
 334
 335                 u16 light = getInteriorLight(node_at_lplayer, 0, m_client->ndef());
 336                 u8 day = light & 0xff;
 337                 u8 night = (light >> 8) & 0xff;
 338                 finalColorBlend(lplayer->light_color, day, night, day_night_ratio);
 339         }
 340
 341         /*
 342                 Step active objects and update lighting of them
 343         */
 344
 345         g_profiler->avg("CEnv: num of objects", m_active_objects.size());
 346         bool update_lighting = m_active_object_light_update_interval.step(dtime, 0.21);
 347         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
 348                 i != m_active_objects.end(); ++i) {
 349                 ClientActiveObject* obj = i->second;
 350                 // Step object
 351                 obj->step(dtime, this);
 352
 353                 if(update_lighting)
 354                 {
 355                         // Update lighting
 356                         u8 light = 0;
 357                         bool pos_ok;
 358
 359                         // Get node at head
 360                         v3s16 p = obj->getLightPosition();
 361                         MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 362                         if (pos_ok)
 363                                 light = n.getLightBlend(day_night_ratio, m_client->ndef());
 364                         else
 365                                 light = blend_light(day_night_ratio, LIGHT_SUN, 0);
 366
 367                         obj->updateLight(light);
 368                 }
 369         }
 370
 371         /*
 372                 Step and handle simple objects
 373         */
 374         g_profiler->avg("CEnv: num of simple objects", m_simple_objects.size());
 375         for(std::vector<ClientSimpleObject*>::iterator
 376                 i = m_simple_objects.begin(); i != m_simple_objects.end();) {
 377                 std::vector<ClientSimpleObject*>::iterator cur = i;
 378                 ClientSimpleObject *simple = *cur;
 379
 380                 simple->step(dtime);
 381                 if(simple->m_to_be_removed) {
 382                         delete simple;
 383                         i = m_simple_objects.erase(cur);
 384                 }
 385                 else {
 386                         ++i;
 387                 }
 388         }
 389 }
 390
 391 void ClientEnvironment::addSimpleObject(ClientSimpleObject *simple)
 392 {
 393         m_simple_objects.push_back(simple);
 394 }
 395
 396 GenericCAO* ClientEnvironment::getGenericCAO(u16 id)
 397 {
 398         ClientActiveObject *obj = getActiveObject(id);
 399         if (obj && obj->getType() == ACTIVEOBJECT_TYPE_GENERIC)
 400                 return (GenericCAO*) obj;
 401         else
 402                 return NULL;
 403 }
 404
 405 ClientActiveObject* ClientEnvironment::getActiveObject(u16 id)
 406 {
 407         UNORDERED_MAP<u16, ClientActiveObject*>::iterator n = m_active_objects.find(id);
 408         if (n == m_active_objects.end())
 409                 return NULL;
 410         return n->second;
 411 }
 412
 413 bool isFreeClientActiveObjectId(const u16 id,
 414         UNORDERED_MAP<u16, ClientActiveObject*> &objects)
 415 {
 416         if(id == 0)
 417                 return false;
 418
 419         return objects.find(id) == objects.end();
 420 }
 421
 422 u16 getFreeClientActiveObjectId(UNORDERED_MAP<u16, ClientActiveObject*> &objects)
 423 {
 424         //try to reuse id's as late as possible
 425         static u16 last_used_id = 0;
 426         u16 startid = last_used_id;
 427         for(;;) {
 428                 last_used_id ++;
 429                 if (isFreeClientActiveObjectId(last_used_id, objects))
 430                         return last_used_id;
 431
 432                 if (last_used_id == startid)
 433                         return 0;
 434         }
 435 }
 436
 437 u16 ClientEnvironment::addActiveObject(ClientActiveObject *object)
 438 {
 439         assert(object); // Pre-condition
 440         if(object->getId() == 0)
 441         {
 442                 u16 new_id = getFreeClientActiveObjectId(m_active_objects);
 443                 if(new_id == 0)
 444                 {
 445                         infostream<<"ClientEnvironment::addActiveObject(): "
 446                                 <<"no free ids available"<<std::endl;
 447                         delete object;
 448                         return 0;
 449                 }
 450                 object->setId(new_id);
 451         }
 452         if (!isFreeClientActiveObjectId(object->getId(), m_active_objects)) {
 453                 infostream<<"ClientEnvironment::addActiveObject(): "
 454                         <<"id is not free ("<<object->getId()<<")"<<std::endl;
 455                 delete object;
 456                 return 0;
 457         }
 458         infostream<<"ClientEnvironment::addActiveObject(): "
 459                 <<"added (id="<<object->getId()<<")"<<std::endl;
 460         m_active_objects[object->getId()] = object;
 461         object->addToScene(m_smgr, m_texturesource, m_irr);
 462         { // Update lighting immediately
 463                 u8 light = 0;
 464                 bool pos_ok;
 465
 466                 // Get node at head
 467                 v3s16 p = object->getLightPosition();
 468                 MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 469                 if (pos_ok)
 470                         light = n.getLightBlend(getDayNightRatio(), m_client->ndef());
 471                 else
 472                         light = blend_light(getDayNightRatio(), LIGHT_SUN, 0);
 473
 474                 object->updateLight(light);
 475         }
 476         return object->getId();
 477 }
 478
 479 void ClientEnvironment::addActiveObject(u16 id, u8 type,
 480         const std::string &init_data)
 481 {
 482         ClientActiveObject* obj =
 483                 ClientActiveObject::create((ActiveObjectType) type, m_client, this);
 484         if(obj == NULL)
 485         {
 486                 infostream<<"ClientEnvironment::addActiveObject(): "
 487                         <<"id="<<id<<" type="<<type<<": Couldn't create object"
 488                         <<std::endl;
 489                 return;
 490         }
 491
 492         obj->setId(id);
 493
 494         try
 495         {
 496                 obj->initialize(init_data);
 497         }
 498         catch(SerializationError &e)
 499         {
 500                 errorstream<<"ClientEnvironment::addActiveObject():"
 501                         <<" id="<<id<<" type="<<type
 502                         <<": SerializationError in initialize(): "
 503                         <<e.what()
 504                         <<": init_data="<<serializeJsonString(init_data)
 505                         <<std::endl;
 506         }
 507
 508         addActiveObject(obj);
 509 }
 510
 511 void ClientEnvironment::removeActiveObject(u16 id)
 512 {
 513         verbosestream<<"ClientEnvironment::removeActiveObject(): "
 514                 <<"id="<<id<<std::endl;
 515         ClientActiveObject* obj = getActiveObject(id);
 516         if (obj == NULL) {
 517                 infostream<<"ClientEnvironment::removeActiveObject(): "
 518                         <<"id="<<id<<" not found"<<std::endl;
 519                 return;
 520         }
 521         obj->removeFromScene(true);
 522         delete obj;
 523         m_active_objects.erase(id);
 524 }
 525
 526 void ClientEnvironment::processActiveObjectMessage(u16 id, const std::string &data)
 527 {
 528         ClientActiveObject *obj = getActiveObject(id);
 529         if (obj == NULL) {
 530                 infostream << "ClientEnvironment::processActiveObjectMessage():"
 531                         << " got message for id=" << id << ", which doesn't exist."
 532                         << std::endl;
 533                 return;
 534         }
 535
 536         try {
 537                 obj->processMessage(data);
 538         } catch (SerializationError &e) {
 539                 errorstream<<"ClientEnvironment::processActiveObjectMessage():"
 540                         << " id=" << id << " type=" << obj->getType()
 541                         << " SerializationError in processMessage(): " << e.what()
 542                         << std::endl;
 543         }
 544 }
 545
 546 /*
 547         Callbacks for activeobjects
 548 */
 549
 550 void ClientEnvironment::damageLocalPlayer(u8 damage, bool handle_hp)
 551 {
 552         LocalPlayer *lplayer = getLocalPlayer();
 553         assert(lplayer);
 554
 555         if (handle_hp) {
 556                 if (lplayer->hp > damage)
 557                         lplayer->hp -= damage;
 558                 else
 559                         lplayer->hp = 0;
 560         }
 561
 562         ClientEnvEvent event;
 563         event.type = CEE_PLAYER_DAMAGE;
 564         event.player_damage.amount = damage;
 565         event.player_damage.send_to_server = handle_hp;
 566         m_client_event_queue.push(event);
 567 }
 568
 569 void ClientEnvironment::updateLocalPlayerBreath(u16 breath)
 570 {
 571         ClientEnvEvent event;
 572         event.type = CEE_PLAYER_BREATH;
 573         event.player_breath.amount = breath;
 574         m_client_event_queue.push(event);
 575 }
 576
 577 /*
 578         Client likes to call these
 579 */
 580
 581 void ClientEnvironment::getActiveObjects(v3f origin, f32 max_d,
 582         std::vector<DistanceSortedActiveObject> &dest)
 583 {
 584         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
 585                 i != m_active_objects.end(); ++i) {
 586                 ClientActiveObject* obj = i->second;
 587
 588                 f32 d = (obj->getPosition() - origin).getLength();
 589
 590                 if(d > max_d)
 591                         continue;
 592
 593                 DistanceSortedActiveObject dso(obj, d);
 594
 595                 dest.push_back(dso);
 596         }
 597 }
 598
 599 ClientEnvEvent ClientEnvironment::getClientEvent()
 600 {
 601         ClientEnvEvent event;
 602         if(m_client_event_queue.empty())
 603                 event.type = CEE_NONE;
 604         else {
 605                 event = m_client_event_queue.front();
 606                 m_client_event_queue.pop();
 607         }
 608         return event;
 609 }
 610
 611 ClientActiveObject * ClientEnvironment::getSelectedActiveObject(
 612         const core::line3d<f32> &shootline_on_map, v3f *intersection_point,
 613         v3s16 *intersection_normal)
 614 {
 615         std::vector<DistanceSortedActiveObject> objects;
 616         getActiveObjects(shootline_on_map.start,
 617                 shootline_on_map.getLength() + 3, objects);
 618         const v3f line_vector = shootline_on_map.getVector();
 619
 620         // Sort them.
 621         // After this, the closest object is the first in the array.
 622         std::sort(objects.begin(), objects.end());
 623
 624         /* Because objects can have different nodebox sizes,
 625          * the object whose center is the nearest isn't necessarily
 626          * the closest one. If an object is found, don't stop
 627          * immediately. */
 628
 629         f32 d_min = shootline_on_map.getLength();
 630         ClientActiveObject *nearest_obj = NULL;
 631         for (u32 i = 0; i < objects.size(); i++) {
 632                 ClientActiveObject *obj = objects[i].obj;
 633
 634                 aabb3f *selection_box = obj->getSelectionBox();
 635                 if (selection_box == NULL)
 636                         continue;
 637
 638                 v3f pos = obj->getPosition();
 639
 640                 aabb3f offsetted_box(selection_box->MinEdge + pos,
 641                         selection_box->MaxEdge + pos);
 642
 643                 if (offsetted_box.getCenter().getDistanceFrom(
 644                         shootline_on_map.start) > d_min + 9.6f*BS) {
 645                         // Probably there is no active object that has bigger nodebox than
 646                         // (-5.5,-5.5,-5.5,5.5,5.5,5.5)
 647                         // 9.6 > 5.5*sqrt(3)
 648                         break;
 649                 }
 650
 651                 v3f current_intersection;
 652                 v3s16 current_normal;
 653                 if (boxLineCollision(offsetted_box, shootline_on_map.start, line_vector,
 654                         &current_intersection, &current_normal)) {
 655                         f32 d_current = current_intersection.getDistanceFrom(
 656                                 shootline_on_map.start);
 657                         if (d_current <= d_min) {
 658                                 d_min = d_current;
 659                                 nearest_obj = obj;
 660                                 *intersection_point = current_intersection;
 661                                 *intersection_normal = current_normal;
 662                         }
 663                 }
 664         }
 665
 666         return nearest_obj;
 667 }
 668
 669 /*
 670         Check if a node is pointable
 671 */
 672 static inline bool isPointableNode(const MapNode &n,
 673         INodeDefManager *ndef, bool liquids_pointable)
 674 {
 675         const ContentFeatures &features = ndef->get(n);
 676         return features.pointable ||
 677                 (liquids_pointable && features.isLiquid());
 678 }
 679
 680 PointedThing ClientEnvironment::getPointedThing(
 681         core::line3d<f32> shootline,
 682         bool liquids_pointable,
 683         bool look_for_object)
 684 {
 685         PointedThing result;
 686
 687         INodeDefManager *nodedef = m_map->getNodeDefManager();
 688
 689         core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 690         // The code needs to search these nodes
 691         core::aabbox3d<s16> search_range(-maximal_exceed.MaxEdge,
 692                 -maximal_exceed.MinEdge);
 693         // If a node is found, there might be a larger node behind.
 694         // To find it, we have to go further.
 695         s16 maximal_overcheck =
 696                 std::max(abs(search_range.MinEdge.X), abs(search_range.MaxEdge.X))
 697                         + std::max(abs(search_range.MinEdge.Y), abs(search_range.MaxEdge.Y))
 698                         + std::max(abs(search_range.MinEdge.Z), abs(search_range.MaxEdge.Z));
 699
 700         const v3f original_vector = shootline.getVector();
 701         const f32 original_length = original_vector.getLength();
 702
 703         f32 min_distance = original_length;
 704
 705         // First try to find an active object
 706         if (look_for_object) {
 707                 ClientActiveObject *selected_object = getSelectedActiveObject(
 708                         shootline, &result.intersection_point,
 709                         &result.intersection_normal);
 710
 711                 if (selected_object != NULL) {
 712                         min_distance =
 713                                 (result.intersection_point - shootline.start).getLength();
 714
 715                         result.type = POINTEDTHING_OBJECT;
 716                         result.object_id = selected_object->getId();
 717                 }
 718         }
 719
 720         // Reduce shootline
 721         if (original_length > 0) {
 722                 shootline.end = shootline.start
 723                         + shootline.getVector() / original_length * min_distance;
 724         }
 725
 726         // Try to find a node that is closer than the selected active
 727         // object (if it exists).
 728
 729         voxalgo::VoxelLineIterator iterator(shootline.start / BS,
 730                 shootline.getVector() / BS);
 731         v3s16 oldnode = iterator.m_current_node_pos;
 732         // Indicates that a node was found.
 733         bool is_node_found = false;
 734         // If a node is found, it is possible that there's a node
 735         // behind it with a large nodebox, so continue the search.
 736         u16 node_foundcounter = 0;
 737         // If a node is found, this is the center of the
 738         // first nodebox the shootline meets.
 739         v3f found_boxcenter(0, 0, 0);
 740         // The untested nodes are in this range.
 741         core::aabbox3d<s16> new_nodes;
 742         while (true) {
 743                 // Test the nodes around the current node in search_range.
 744                 new_nodes = search_range;
 745                 new_nodes.MinEdge += iterator.m_current_node_pos;
 746                 new_nodes.MaxEdge += iterator.m_current_node_pos;
 747
 748                 // Only check new nodes
 749                 v3s16 delta = iterator.m_current_node_pos - oldnode;
 750                 if (delta.X > 0)
 751                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 752                 else if (delta.X < 0)
 753                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 754                 else if (delta.Y > 0)
 755                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 756                 else if (delta.Y < 0)
 757                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 758                 else if (delta.Z > 0)
 759                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 760                 else if (delta.Z < 0)
 761                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 762
 763                 // For each untested node
 764                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++) {
 765                         for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++) {
 766                                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 767                                         MapNode n;
 768                                         v3s16 np(x, y, z);
 769                                         bool is_valid_position;
 770
 771                                         n = m_map->getNodeNoEx(np, &is_valid_position);
 772                                         if (!(is_valid_position &&
 773                                                 isPointableNode(n, nodedef, liquids_pointable))) {
 774                                                 continue;
 775                                         }
 776                                         std::vector<aabb3f> boxes;
 777                                         n.getSelectionBoxes(nodedef, &boxes,
 778                                                 n.getNeighbors(np, m_map));
 779
 780                                         v3f npf = intToFloat(np, BS);
 781                                         for (std::vector<aabb3f>::const_iterator i = boxes.begin();
 782                                                 i != boxes.end(); ++i) {
 783                                                 aabb3f box = *i;
 784                                                 box.MinEdge += npf;
 785                                                 box.MaxEdge += npf;
 786                                                 v3f intersection_point;
 787                                                 v3s16 intersection_normal;
 788                                                 if (!boxLineCollision(box, shootline.start, shootline.getVector(),
 789                                                         &intersection_point, &intersection_normal)) {
 790                                                         continue;
 791                                                 }
 792                                                 f32 distance = (intersection_point - shootline.start).getLength();
 793                                                 if (distance >= min_distance) {
 794                                                         continue;
 795                                                 }
 796                                                 result.type = POINTEDTHING_NODE;
 797                                                 result.node_undersurface = np;
 798                                                 result.intersection_point = intersection_point;
 799                                                 result.intersection_normal = intersection_normal;
 800                                                 found_boxcenter = box.getCenter();
 801                                                 min_distance = distance;
 802                                                 is_node_found = true;
 803                                         }
 804                                 }
 805                         }
 806                 }
 807                 if (is_node_found) {
 808                         node_foundcounter++;
 809                         if (node_foundcounter > maximal_overcheck) {
 810                                 break;
 811                         }
 812                 }
 813                 // Next node
 814                 if (iterator.hasNext()) {
 815                         oldnode = iterator.m_current_node_pos;
 816                         iterator.next();
 817                 } else {
 818                         break;
 819                 }
 820         }
 821
 822         if (is_node_found) {
 823                 // Set undersurface and abovesurface nodes
 824                 f32 d = 0.002 * BS;
 825                 v3f fake_intersection = result.intersection_point;
 826                 // Move intersection towards its source block.
 827                 if (fake_intersection.X < found_boxcenter.X)
 828                         fake_intersection.X += d;
 829                 else
 830                         fake_intersection.X -= d;
 831
 832                 if (fake_intersection.Y < found_boxcenter.Y)
 833                         fake_intersection.Y += d;
 834                 else
 835                         fake_intersection.Y -= d;
 836
 837                 if (fake_intersection.Z < found_boxcenter.Z)
 838                         fake_intersection.Z += d;
 839                 else
 840                         fake_intersection.Z -= d;
 841
 842                 result.node_real_undersurface = floatToInt(fake_intersection, BS);
 843                 result.node_abovesurface = result.node_real_undersurface
 844                         + result.intersection_normal;
 845         }
 846         return result;
 847 }