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