src/camera.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 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 "camera.h"
  21 #include "debug.h"
  22 #include "client.h"
  23 #include "map.h"
  24 #include "clientmap.h"     // MapDrawControl
  25 #include "player.h"
  26 #include <cmath>
  27 #include "settings.h"
  28 #include "wieldmesh.h"
  29 #include "noise.h"         // easeCurve
  30 #include "sound.h"
  31 #include "event.h"
  32 #include "profiler.h"
  33 #include "util/numeric.h"
  34 #include "constants.h"
  35 #include "fontengine.h"
  36 #include "script/scripting_client.h"
  37
  38 #define CAMERA_OFFSET_STEP 200
  39
  40 #include "nodedef.h"
  41
  42 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  43                 Client *client):
  44         m_draw_control(draw_control),
  45         m_client(client)
  46 {
  47         //dstream<<FUNCTION_NAME<<std::endl;
  48
  49         m_driver = smgr->getVideoDriver();
  50         // note: making the camera node a child of the player node
  51         // would lead to unexpected behaviour, so we don't do that.
  52         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  53         m_headnode = smgr->addEmptySceneNode(m_playernode);
  54         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  55         m_cameranode->bindTargetAndRotation(true);
  56
  57         // This needs to be in its own scene manager. It is drawn after
  58         // all other 3D scene nodes and before the GUI.
  59         m_wieldmgr = smgr->createNewSceneManager();
  60         m_wieldmgr->addCameraSceneNode();
  61         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, false);
  62         m_wieldnode->setItem(ItemStack(), m_client);
  63         m_wieldnode->drop(); // m_wieldmgr grabbed it
  64
  65         /* TODO: Add a callback function so these can be updated when a setting
  66          *       changes.  At this point in time it doesn't matter (e.g. /set
  67          *       is documented to change server settings only)
  68          *
  69          * TODO: Local caching of settings is not optimal and should at some stage
  70          *       be updated to use a global settings object for getting thse values
  71          *       (as opposed to the this local caching). This can be addressed in
  72          *       a later release.
  73          */
  74         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
  75         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
  76         m_cache_fov                 = g_settings->getFloat("fov");
  77         m_cache_zoom_fov            = g_settings->getFloat("zoom_fov");
  78         m_nametags.clear();
  79 }
  80
  81 Camera::~Camera()
  82 {
  83         m_wieldmgr->drop();
  84 }
  85
  86 bool Camera::successfullyCreated(std::string &error_message)
  87 {
  88         if (!m_playernode) {
  89                 error_message = "Failed to create the player scene node";
  90         } else if (!m_headnode) {
  91                 error_message = "Failed to create the head scene node";
  92         } else if (!m_cameranode) {
  93                 error_message = "Failed to create the camera scene node";
  94         } else if (!m_wieldmgr) {
  95                 error_message = "Failed to create the wielded item scene manager";
  96         } else if (!m_wieldnode) {
  97                 error_message = "Failed to create the wielded item scene node";
  98         } else {
  99                 error_message.clear();
 100         }
 101
 102         if (g_settings->getBool("enable_client_modding")) {
 103                 m_client->getScript()->on_camera_ready(this);
 104         }
 105         return error_message.empty();
 106 }
 107
 108 // Returns the fractional part of x
 109 inline f32 my_modf(f32 x)
 110 {
 111         double dummy;
 112         return modf(x, &dummy);
 113 }
 114
 115 void Camera::step(f32 dtime)
 116 {
 117         if(m_view_bobbing_fall > 0)
 118         {
 119                 m_view_bobbing_fall -= 3 * dtime;
 120                 if(m_view_bobbing_fall <= 0)
 121                         m_view_bobbing_fall = -1; // Mark the effect as finished
 122         }
 123
 124         bool was_under_zero = m_wield_change_timer < 0;
 125         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 126
 127         if (m_wield_change_timer >= 0 && was_under_zero)
 128                 m_wieldnode->setItem(m_wield_item_next, m_client);
 129
 130         if (m_view_bobbing_state != 0)
 131         {
 132                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 133                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 134                 if (m_view_bobbing_state == 2) {
 135                         // Animation is getting turned off
 136                         if (m_view_bobbing_anim < 0.25) {
 137                                 m_view_bobbing_anim -= offset;
 138                         } else if (m_view_bobbing_anim > 0.75) {
 139                                 m_view_bobbing_anim += offset;
 140                         }
 141
 142                         if (m_view_bobbing_anim < 0.5) {
 143                                 m_view_bobbing_anim += offset;
 144                                 if (m_view_bobbing_anim > 0.5)
 145                                         m_view_bobbing_anim = 0.5;
 146                         } else {
 147                                 m_view_bobbing_anim -= offset;
 148                                 if (m_view_bobbing_anim < 0.5)
 149                                         m_view_bobbing_anim = 0.5;
 150                         }
 151
 152                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 153                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 154                                 m_view_bobbing_anim = 0;
 155                                 m_view_bobbing_state = 0;
 156                         }
 157                 }
 158                 else {
 159                         float was = m_view_bobbing_anim;
 160                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 161                         bool step = (was == 0 ||
 162                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 163                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 164                         if(step) {
 165                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 166                                 m_client->event()->put(e);
 167                         }
 168                 }
 169         }
 170
 171         if (m_digging_button != -1)
 172         {
 173                 f32 offset = dtime * 3.5;
 174                 float m_digging_anim_was = m_digging_anim;
 175                 m_digging_anim += offset;
 176                 if (m_digging_anim >= 1)
 177                 {
 178                         m_digging_anim = 0;
 179                         m_digging_button = -1;
 180                 }
 181                 float lim = 0.15;
 182                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 183                 {
 184                         if(m_digging_button == 0)
 185                         {
 186                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 187                                 m_client->event()->put(e);
 188                         } else if(m_digging_button == 1) {
 189                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 190                                 m_client->event()->put(e);
 191                         }
 192                 }
 193         }
 194 }
 195
 196 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 197                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 198 {
 199         // Get player position
 200         // Smooth the movement when walking up stairs
 201         v3f old_player_position = m_playernode->getPosition();
 202         v3f player_position = player->getPosition();
 203         if (player->isAttached && player->parent)
 204                 player_position = player->parent->getPosition();
 205         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 206         if(player->touching_ground &&
 207                         player_position.Y > old_player_position.Y)
 208         {
 209                 f32 oldy = old_player_position.Y;
 210                 f32 newy = player_position.Y;
 211                 f32 t = exp(-23*frametime);
 212                 player_position.Y = oldy * t + newy * (1-t);
 213         }
 214
 215         // Set player node transformation
 216         m_playernode->setPosition(player_position);
 217         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 218         m_playernode->updateAbsolutePosition();
 219
 220         // Get camera tilt timer (hurt animation)
 221         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 222
 223         // Fall bobbing animation
 224         float fall_bobbing = 0;
 225         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 226         {
 227                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 228                         player->camera_impact = m_view_bobbing_fall = 0;
 229                 else if(m_view_bobbing_fall == 0) // Initialize effect
 230                         m_view_bobbing_fall = 1;
 231
 232                 // Convert 0 -> 1 to 0 -> 1 -> 0
 233                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 234                 // Smoothen and invert the above
 235                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 236                 // Amplify according to the intensity of the impact
 237                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 238
 239                 fall_bobbing *= m_cache_fall_bobbing_amount;
 240         }
 241
 242         // Calculate players eye offset for different camera modes
 243         v3f PlayerEyeOffset = player->getEyeOffset();
 244         if (m_camera_mode == CAMERA_MODE_FIRST)
 245                 PlayerEyeOffset += player->eye_offset_first;
 246         else
 247                 PlayerEyeOffset += player->eye_offset_third;
 248
 249         // Set head node transformation
 250         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 251         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 252         m_headnode->updateAbsolutePosition();
 253
 254         // Compute relative camera position and target
 255         v3f rel_cam_pos = v3f(0,0,0);
 256         v3f rel_cam_target = v3f(0,0,1);
 257         v3f rel_cam_up = v3f(0,1,0);
 258
 259         if (m_cache_view_bobbing_amount != 0.0f && m_view_bobbing_anim != 0.0f &&
 260                 m_camera_mode < CAMERA_MODE_THIRD) {
 261                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 262                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 263
 264                 #if 1
 265                 f32 bobknob = 1.2;
 266                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 267                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 268
 269                 v3f bobvec = v3f(
 270                         0.3 * bobdir * sin(bobfrac * M_PI),
 271                         -0.28 * bobtmp * bobtmp,
 272                         0.);
 273
 274                 //rel_cam_pos += 0.2 * bobvec;
 275                 //rel_cam_target += 0.03 * bobvec;
 276                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 277                 float f = 1.0;
 278                 f *= m_cache_view_bobbing_amount;
 279                 rel_cam_pos += bobvec * f;
 280                 //rel_cam_target += 0.995 * bobvec * f;
 281                 rel_cam_target += bobvec * f;
 282                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 283                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 284                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 285                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 286                 #else
 287                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 288                 f32 angle_rad = angle_deg * M_PI / 180;
 289                 f32 r = 0.05;
 290                 v3f off = v3f(
 291                         r * sin(angle_rad),
 292                         r * (cos(angle_rad) - 1),
 293                         0);
 294                 rel_cam_pos += off;
 295                 //rel_cam_target += off;
 296                 rel_cam_up.rotateXYBy(angle_deg);
 297                 #endif
 298
 299         }
 300
 301         // Compute absolute camera position and target
 302         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 303         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 304
 305         v3f abs_cam_up;
 306         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 307
 308         // Seperate camera position for calculation
 309         v3f my_cp = m_camera_position;
 310
 311         // Reposition the camera for third person view
 312         if (m_camera_mode > CAMERA_MODE_FIRST)
 313         {
 314                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 315                         m_camera_direction *= -1;
 316
 317                 my_cp.Y += 2;
 318
 319                 // Calculate new position
 320                 bool abort = false;
 321                 for (int i = BS; i <= BS*2.75; i++)
 322                 {
 323                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 324                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 325                         if (i > 12)
 326                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 327
 328                         // Prevent camera positioned inside nodes
 329                         INodeDefManager *nodemgr = m_client->ndef();
 330                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 331                         const ContentFeatures& features = nodemgr->get(n);
 332                         if(features.walkable)
 333                         {
 334                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 335                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 336                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 337                                 abort = true;
 338                                 break;
 339                         }
 340                 }
 341
 342                 // If node blocks camera position don't move y to heigh
 343                 if (abort && my_cp.Y > player_position.Y+BS*2)
 344                         my_cp.Y = player_position.Y+BS*2;
 345         }
 346
 347         // Update offset if too far away from the center of the map
 348         m_camera_offset.X += CAMERA_OFFSET_STEP*
 349                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 350         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 351                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 352         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 353                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 354
 355         // Set camera node transformation
 356         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 357         m_cameranode->setUpVector(abs_cam_up);
 358         // *100.0 helps in large map coordinates
 359         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 360
 361         // update the camera position in front-view mode to render blocks behind player
 362         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 363                 m_camera_position = my_cp;
 364
 365         // Get FOV
 366         f32 fov_degrees;
 367         if (player->getPlayerControl().zoom && m_client->checkLocalPrivilege("zoom")) {
 368                 fov_degrees = m_cache_zoom_fov;
 369         } else {
 370                 fov_degrees = m_cache_fov;
 371         }
 372         fov_degrees = rangelim(fov_degrees, 7.0, 160.0);
 373
 374         // FOV and aspect ratio
 375         m_aspect = (f32) porting::getWindowSize().X / (f32) porting::getWindowSize().Y;
 376         m_fov_y = fov_degrees * M_PI / 180.0;
 377         // Increase vertical FOV on lower aspect ratios (<16:10)
 378         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 379         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 380         m_cameranode->setAspectRatio(m_aspect);
 381         m_cameranode->setFOV(m_fov_y);
 382
 383         float wieldmesh_offset_Y = -35 + player->getPitch() * 0.05;
 384         wieldmesh_offset_Y = rangelim(wieldmesh_offset_Y, -52, -32);
 385
 386         // Position the wielded item
 387         //v3f wield_position = v3f(45, -35, 65);
 388         v3f wield_position = v3f(55, wieldmesh_offset_Y, 65);
 389         //v3f wield_rotation = v3f(-100, 120, -100);
 390         v3f wield_rotation = v3f(-100, 120, -100);
 391         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 392         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 393         {
 394                 f32 frac = 1.0;
 395                 if(m_digging_anim > 0.5)
 396                         frac = 2.0 * (m_digging_anim - 0.5);
 397                 // This value starts from 1 and settles to 0
 398                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 399                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 400                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 401                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 402                 //wield_position.Z += frac * 5.0 * ratiothing2;
 403                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 404                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 405                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 406                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 407         }
 408         if (m_digging_button != -1)
 409         {
 410                 f32 digfrac = m_digging_anim;
 411                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 412                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 413                 wield_position.Z += 25 * 0.5;
 414
 415                 // Euler angles are PURE EVIL, so why not use quaternions?
 416                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 417                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 418                 core::quaternion quat_slerp;
 419                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 420                 quat_slerp.toEuler(wield_rotation);
 421                 wield_rotation *= core::RADTODEG;
 422         } else {
 423                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 424                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 425                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 426         }
 427         m_wieldnode->setPosition(wield_position);
 428         m_wieldnode->setRotation(wield_rotation);
 429
 430         m_wieldnode->setColor(player->light_color);
 431
 432         // Set render distance
 433         updateViewingRange();
 434
 435         // If the player is walking, swimming, or climbing,
 436         // view bobbing is enabled and free_move is off,
 437         // start (or continue) the view bobbing animation.
 438         v3f speed = player->getSpeed();
 439         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 440         const bool movement_Y = fabs(speed.Y) > BS;
 441
 442         const bool walking = movement_XZ && player->touching_ground;
 443         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 444         const bool climbing = movement_Y && player->is_climbing;
 445         if ((walking || swimming || climbing) &&
 446                         (!g_settings->getBool("free_move") || !m_client->checkLocalPrivilege("fly"))) {
 447                 // Start animation
 448                 m_view_bobbing_state = 1;
 449                 m_view_bobbing_speed = MYMIN(speed.getLength(), 70);
 450         }
 451         else if (m_view_bobbing_state == 1)
 452         {
 453                 // Stop animation
 454                 m_view_bobbing_state = 2;
 455                 m_view_bobbing_speed = 60;
 456         }
 457 }
 458
 459 void Camera::updateViewingRange()
 460 {
 461         f32 viewing_range = g_settings->getFloat("viewing_range");
 462         m_draw_control.wanted_range = viewing_range;
 463         if (m_draw_control.range_all) {
 464                 m_cameranode->setFarValue(100000.0);
 465                 return;
 466         }
 467         m_cameranode->setFarValue((viewing_range < 2000) ? 2000 * BS : viewing_range * BS);
 468 }
 469
 470 void Camera::setDigging(s32 button)
 471 {
 472         if (m_digging_button == -1)
 473                 m_digging_button = button;
 474 }
 475
 476 void Camera::wield(const ItemStack &item)
 477 {
 478         if (item.name != m_wield_item_next.name ||
 479                         item.metadata != m_wield_item_next.metadata) {
 480                 m_wield_item_next = item;
 481                 if (m_wield_change_timer > 0)
 482                         m_wield_change_timer = -m_wield_change_timer;
 483                 else if (m_wield_change_timer == 0)
 484                         m_wield_change_timer = -0.001;
 485         }
 486 }
 487
 488 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 489 {
 490         // Clear Z buffer so that the wielded tool stay in front of world geometry
 491         m_wieldmgr->getVideoDriver()->clearZBuffer();
 492
 493         // Draw the wielded node (in a separate scene manager)
 494         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 495         cam->setAspectRatio(m_cameranode->getAspectRatio());
 496         cam->setFOV(72.0*M_PI/180.0);
 497         cam->setNearValue(10);
 498         cam->setFarValue(1000);
 499         if (translation != NULL)
 500         {
 501                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 502                 irr::core::vector3df focusPoint = (cam->getTarget()
 503                                 - cam->getAbsolutePosition()).setLength(1)
 504                                 + cam->getAbsolutePosition();
 505
 506                 irr::core::vector3df camera_pos =
 507                                 (startMatrix * *translation).getTranslation();
 508                 cam->setPosition(camera_pos);
 509                 cam->setTarget(focusPoint);
 510         }
 511         m_wieldmgr->drawAll();
 512 }
 513
 514 void Camera::drawNametags()
 515 {
 516         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 517         trans *= m_cameranode->getViewMatrix();
 518
 519         for (std::list<Nametag *>::const_iterator
 520                         i = m_nametags.begin();
 521                         i != m_nametags.end(); ++i) {
 522                 Nametag *nametag = *i;
 523                 if (nametag->nametag_color.getAlpha() == 0) {
 524                         // Enforce hiding nametag,
 525                         // because if freetype is enabled, a grey
 526                         // shadow can remain.
 527                         continue;
 528                 }
 529                 v3f pos = nametag->parent_node->getAbsolutePosition() + v3f(0.0, 1.1 * BS, 0.0);
 530                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 531                 trans.multiplyWith1x4Matrix(transformed_pos);
 532                 if (transformed_pos[3] > 0) {
 533                         std::string nametag_colorless = unescape_enriched(nametag->nametag_text);
 534                         core::dimension2d<u32> textsize =
 535                                 g_fontengine->getFont()->getDimension(
 536                                 utf8_to_wide(nametag_colorless).c_str());
 537                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 538                                 core::reciprocal(transformed_pos[3]);
 539                         v2u32 screensize = m_driver->getScreenSize();
 540                         v2s32 screen_pos;
 541                         screen_pos.X = screensize.X *
 542                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 543                         screen_pos.Y = screensize.Y *
 544                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 545                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 546                         g_fontengine->getFont()->draw(utf8_to_wide(nametag->nametag_text).c_str(),
 547                                         size + screen_pos, nametag->nametag_color);
 548                 }
 549         }
 550 }
 551
 552 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 553                 std::string nametag_text, video::SColor nametag_color)
 554 {
 555         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color);
 556         m_nametags.push_back(nametag);
 557         return nametag;
 558 }
 559
 560 void Camera::removeNametag(Nametag *nametag)
 561 {
 562         m_nametags.remove(nametag);
 563         delete nametag;
 564 }