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 "client/renderingengine.h"
  28 #include "settings.h"
  29 #include "wieldmesh.h"
  30 #include "noise.h"         // easeCurve
  31 #include "sound.h"
  32 #include "event.h"
  33 #include "profiler.h"
  34 #include "util/numeric.h"
  35 #include "constants.h"
  36 #include "fontengine.h"
  37 #include "script/scripting_client.h"
  38
  39 #define CAMERA_OFFSET_STEP 200
  40
  41 #include "nodedef.h"
  42
  43 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  44                 Client *client):
  45         m_draw_control(draw_control),
  46         m_client(client)
  47 {
  48         //dstream<<FUNCTION_NAME<<std::endl;
  49
  50         m_driver = smgr->getVideoDriver();
  51         // note: making the camera node a child of the player node
  52         // would lead to unexpected behaviour, so we don't do that.
  53         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  54         m_headnode = smgr->addEmptySceneNode(m_playernode);
  55         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  56         m_cameranode->bindTargetAndRotation(true);
  57
  58         // This needs to be in its own scene manager. It is drawn after
  59         // all other 3D scene nodes and before the GUI.
  60         m_wieldmgr = smgr->createNewSceneManager();
  61         m_wieldmgr->addCameraSceneNode();
  62         m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, false);
  63         m_wieldnode->setItem(ItemStack(), m_client);
  64         m_wieldnode->drop(); // m_wieldmgr grabbed it
  65
  66         /* TODO: Add a callback function so these can be updated when a setting
  67          *       changes.  At this point in time it doesn't matter (e.g. /set
  68          *       is documented to change server settings only)
  69          *
  70          * TODO: Local caching of settings is not optimal and should at some stage
  71          *       be updated to use a global settings object for getting thse values
  72          *       (as opposed to the this local caching). This can be addressed in
  73          *       a later release.
  74          */
  75         m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
  76         m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
  77         m_cache_fov                 = g_settings->getFloat("fov");
  78         m_cache_zoom_fov            = g_settings->getFloat("zoom_fov");
  79         m_arm_inertia               = g_settings->getBool("arm_inertia");
  80         m_nametags.clear();
  81 }
  82
  83 Camera::~Camera()
  84 {
  85         m_wieldmgr->drop();
  86 }
  87
  88 bool Camera::successfullyCreated(std::string &error_message)
  89 {
  90         if (!m_playernode) {
  91                 error_message = "Failed to create the player scene node";
  92         } else if (!m_headnode) {
  93                 error_message = "Failed to create the head scene node";
  94         } else if (!m_cameranode) {
  95                 error_message = "Failed to create the camera scene node";
  96         } else if (!m_wieldmgr) {
  97                 error_message = "Failed to create the wielded item scene manager";
  98         } else if (!m_wieldnode) {
  99                 error_message = "Failed to create the wielded item scene node";
 100         } else {
 101                 error_message.clear();
 102         }
 103
 104         if (g_settings->getBool("enable_client_modding")) {
 105                 m_client->getScript()->on_camera_ready(this);
 106         }
 107         return error_message.empty();
 108 }
 109
 110 // Returns the fractional part of x
 111 inline f32 my_modf(f32 x)
 112 {
 113         double dummy;
 114         return modf(x, &dummy);
 115 }
 116
 117 void Camera::step(f32 dtime)
 118 {
 119         if(m_view_bobbing_fall > 0)
 120         {
 121                 m_view_bobbing_fall -= 3 * dtime;
 122                 if(m_view_bobbing_fall <= 0)
 123                         m_view_bobbing_fall = -1; // Mark the effect as finished
 124         }
 125
 126         bool was_under_zero = m_wield_change_timer < 0;
 127         m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);
 128
 129         if (m_wield_change_timer >= 0 && was_under_zero)
 130                 m_wieldnode->setItem(m_wield_item_next, m_client);
 131
 132         if (m_view_bobbing_state != 0)
 133         {
 134                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 135                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 136                 if (m_view_bobbing_state == 2) {
 137                         // Animation is getting turned off
 138                         if (m_view_bobbing_anim < 0.25) {
 139                                 m_view_bobbing_anim -= offset;
 140                         } else if (m_view_bobbing_anim > 0.75) {
 141                                 m_view_bobbing_anim += offset;
 142                         }
 143
 144                         if (m_view_bobbing_anim < 0.5) {
 145                                 m_view_bobbing_anim += offset;
 146                                 if (m_view_bobbing_anim > 0.5)
 147                                         m_view_bobbing_anim = 0.5;
 148                         } else {
 149                                 m_view_bobbing_anim -= offset;
 150                                 if (m_view_bobbing_anim < 0.5)
 151                                         m_view_bobbing_anim = 0.5;
 152                         }
 153
 154                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 155                                         fabs(m_view_bobbing_anim - 0.5) < 0.01) {
 156                                 m_view_bobbing_anim = 0;
 157                                 m_view_bobbing_state = 0;
 158                         }
 159                 }
 160                 else {
 161                         float was = m_view_bobbing_anim;
 162                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 163                         bool step = (was == 0 ||
 164                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 165                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 166                         if(step) {
 167                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 168                                 m_client->event()->put(e);
 169                         }
 170                 }
 171         }
 172
 173         if (m_digging_button != -1)
 174         {
 175                 f32 offset = dtime * 3.5;
 176                 float m_digging_anim_was = m_digging_anim;
 177                 m_digging_anim += offset;
 178                 if (m_digging_anim >= 1)
 179                 {
 180                         m_digging_anim = 0;
 181                         m_digging_button = -1;
 182                 }
 183                 float lim = 0.15;
 184                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 185                 {
 186                         if(m_digging_button == 0)
 187                         {
 188                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 189                                 m_client->event()->put(e);
 190                         } else if(m_digging_button == 1) {
 191                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 192                                 m_client->event()->put(e);
 193                         }
 194                 }
 195         }
 196 }
 197
 198 void Camera::addArmInertia(f32 player_yaw, f32 frametime)
 199 {
 200         m_cam_vel.X = std::fabs((m_last_cam_pos.X - player_yaw) / m_timer.X) * 0.01f;
 201         m_cam_vel.Y = std::fabs((m_last_cam_pos.Y - m_camera_direction.Y) / m_timer.Y);
 202
 203         if (m_cam_vel.X > 1.0f || m_cam_vel.Y > 1.0f) {
 204                 /*
 205                    the arm moves when the camera moves fast enough.
 206                 */
 207
 208                 if (m_cam_vel.X > 1.0f) {
 209                         m_timer.X = 0.0f;
 210                         m_timer.X += frametime;
 211
 212                         if (m_cam_vel.X > m_cam_vel_old.X)
 213                                 m_cam_vel_old.X = m_cam_vel.X;
 214
 215                         if (m_last_cam_pos.X > player_yaw)
 216                                 // right
 217                                 m_wieldmesh_offset.X -= (0.1f + frametime) * m_cam_vel.X;
 218                         else
 219                                 // left
 220                                 m_wieldmesh_offset.X += (0.1f + frametime) * m_cam_vel.X;
 221
 222                         if (m_last_cam_pos.X != player_yaw)
 223                                 m_last_cam_pos.X = player_yaw;
 224
 225                         m_wieldmesh_offset.X = rangelim(m_wieldmesh_offset.X, 48.0f, 62.0f);
 226                 }
 227
 228                 if (m_cam_vel.Y > 1.0f) {
 229                         m_timer.Y = 0.0f;
 230                         m_timer.Y += frametime;
 231
 232                         if (m_cam_vel.Y > m_cam_vel_old.Y)
 233                                 m_cam_vel_old.Y = m_cam_vel.Y;
 234
 235                         if (m_last_cam_pos.Y > m_camera_direction.Y)
 236                                 // down
 237                                 m_wieldmesh_offset.Y += (0.1f + frametime) * m_cam_vel.Y;
 238                         else
 239                                 // up
 240                                 m_wieldmesh_offset.Y -= (0.1f + frametime) * m_cam_vel.Y;
 241
 242                         if (m_last_cam_pos.Y != m_camera_direction.Y)
 243                                 m_last_cam_pos.Y = m_camera_direction.Y;
 244
 245                         m_wieldmesh_offset.Y = rangelim(m_wieldmesh_offset.Y, -45.0f, -30.0f);
 246                 }
 247         } else {
 248                 /*
 249                    the arm now gets back to its default position when the camera stops.
 250                 */
 251
 252                 if (floor(m_wieldmesh_offset.X) == 55.0f) {
 253                         m_cam_vel_old.X = 0.0f;
 254                         m_wieldmesh_offset.X = 55.0f;
 255                 }
 256
 257                 if (m_wieldmesh_offset.X > 55.0f)
 258                         m_wieldmesh_offset.X -= (0.05f + frametime) * m_cam_vel_old.X;
 259                 if (m_wieldmesh_offset.X < 55.0f)
 260                         m_wieldmesh_offset.X += (0.05f + frametime) * m_cam_vel_old.X;
 261
 262                 if (floor(m_wieldmesh_offset.Y) == -35.0f) {
 263                         m_cam_vel_old.Y = 0.0f;
 264                         m_wieldmesh_offset.Y = -35.0f;
 265                 }
 266
 267                 if (m_wieldmesh_offset.Y > -35.0f)
 268                         m_wieldmesh_offset.Y -= (0.05f + frametime) * m_cam_vel_old.Y;
 269                 if (m_wieldmesh_offset.Y < -35.0f)
 270                         m_wieldmesh_offset.Y += (0.05f + frametime) * m_cam_vel_old.Y;
 271         }
 272 }
 273
 274 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 275                 f32 tool_reload_ratio, ClientEnvironment &c_env)
 276 {
 277         // Get player position
 278         // Smooth the movement when walking up stairs
 279         v3f old_player_position = m_playernode->getPosition();
 280         v3f player_position = player->getPosition();
 281         if (player->isAttached && player->parent)
 282                 player_position = player->parent->getPosition();
 283         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 284         if(player->touching_ground &&
 285                         player_position.Y > old_player_position.Y)
 286         {
 287                 f32 oldy = old_player_position.Y;
 288                 f32 newy = player_position.Y;
 289                 f32 t = exp(-23*frametime);
 290                 player_position.Y = oldy * t + newy * (1-t);
 291         }
 292
 293         // Set player node transformation
 294         m_playernode->setPosition(player_position);
 295         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 296         m_playernode->updateAbsolutePosition();
 297
 298         // Get camera tilt timer (hurt animation)
 299         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 300
 301         // Fall bobbing animation
 302         float fall_bobbing = 0;
 303         if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
 304         {
 305                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 306                         player->camera_impact = m_view_bobbing_fall = 0;
 307                 else if(m_view_bobbing_fall == 0) // Initialize effect
 308                         m_view_bobbing_fall = 1;
 309
 310                 // Convert 0 -> 1 to 0 -> 1 -> 0
 311                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 312                 // Smoothen and invert the above
 313                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 314                 // Amplify according to the intensity of the impact
 315                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 316
 317                 fall_bobbing *= m_cache_fall_bobbing_amount;
 318         }
 319
 320         // Calculate players eye offset for different camera modes
 321         v3f PlayerEyeOffset = player->getEyeOffset();
 322         if (m_camera_mode == CAMERA_MODE_FIRST)
 323                 PlayerEyeOffset += player->eye_offset_first;
 324         else
 325                 PlayerEyeOffset += player->eye_offset_third;
 326
 327         // Set head node transformation
 328         m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 329         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 330         m_headnode->updateAbsolutePosition();
 331
 332         // Compute relative camera position and target
 333         v3f rel_cam_pos = v3f(0,0,0);
 334         v3f rel_cam_target = v3f(0,0,1);
 335         v3f rel_cam_up = v3f(0,1,0);
 336
 337         if (m_cache_view_bobbing_amount != 0.0f && m_view_bobbing_anim != 0.0f &&
 338                 m_camera_mode < CAMERA_MODE_THIRD) {
 339                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 340                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 341
 342                 #if 1
 343                 f32 bobknob = 1.2;
 344                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 345                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 346
 347                 v3f bobvec = v3f(
 348                         0.3 * bobdir * sin(bobfrac * M_PI),
 349                         -0.28 * bobtmp * bobtmp,
 350                         0.);
 351
 352                 //rel_cam_pos += 0.2 * bobvec;
 353                 //rel_cam_target += 0.03 * bobvec;
 354                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 355                 float f = 1.0;
 356                 f *= m_cache_view_bobbing_amount;
 357                 rel_cam_pos += bobvec * f;
 358                 //rel_cam_target += 0.995 * bobvec * f;
 359                 rel_cam_target += bobvec * f;
 360                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 361                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 362                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 363                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 364                 #else
 365                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 366                 f32 angle_rad = angle_deg * M_PI / 180;
 367                 f32 r = 0.05;
 368                 v3f off = v3f(
 369                         r * sin(angle_rad),
 370                         r * (cos(angle_rad) - 1),
 371                         0);
 372                 rel_cam_pos += off;
 373                 //rel_cam_target += off;
 374                 rel_cam_up.rotateXYBy(angle_deg);
 375                 #endif
 376
 377         }
 378
 379         // Compute absolute camera position and target
 380         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 381         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 382
 383         v3f abs_cam_up;
 384         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 385
 386         // Seperate camera position for calculation
 387         v3f my_cp = m_camera_position;
 388
 389         // Reposition the camera for third person view
 390         if (m_camera_mode > CAMERA_MODE_FIRST)
 391         {
 392                 if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 393                         m_camera_direction *= -1;
 394
 395                 my_cp.Y += 2;
 396
 397                 // Calculate new position
 398                 bool abort = false;
 399                 for (int i = BS; i <= BS*2.75; i++)
 400                 {
 401                         my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
 402                         my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
 403                         if (i > 12)
 404                                 my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);
 405
 406                         // Prevent camera positioned inside nodes
 407                         INodeDefManager *nodemgr = m_client->ndef();
 408                         MapNode n = c_env.getClientMap().getNodeNoEx(floatToInt(my_cp, BS));
 409                         const ContentFeatures& features = nodemgr->get(n);
 410                         if(features.walkable)
 411                         {
 412                                 my_cp.X += m_camera_direction.X*-1*-BS/2;
 413                                 my_cp.Z += m_camera_direction.Z*-1*-BS/2;
 414                                 my_cp.Y += m_camera_direction.Y*-1*-BS/2;
 415                                 abort = true;
 416                                 break;
 417                         }
 418                 }
 419
 420                 // If node blocks camera position don't move y to heigh
 421                 if (abort && my_cp.Y > player_position.Y+BS*2)
 422                         my_cp.Y = player_position.Y+BS*2;
 423         }
 424
 425         // Update offset if too far away from the center of the map
 426         m_camera_offset.X += CAMERA_OFFSET_STEP*
 427                         (((s16)(my_cp.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 428         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 429                         (((s16)(my_cp.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 430         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 431                         (((s16)(my_cp.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 432
 433         // Set camera node transformation
 434         m_cameranode->setPosition(my_cp-intToFloat(m_camera_offset, BS));
 435         m_cameranode->setUpVector(abs_cam_up);
 436         // *100.0 helps in large map coordinates
 437         m_cameranode->setTarget(my_cp-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 438
 439         // update the camera position in front-view mode to render blocks behind player
 440         if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
 441                 m_camera_position = my_cp;
 442
 443         // Get FOV
 444         f32 fov_degrees;
 445         if (player->getPlayerControl().zoom && m_client->checkLocalPrivilege("zoom")) {
 446                 fov_degrees = m_cache_zoom_fov;
 447         } else {
 448                 fov_degrees = m_cache_fov;
 449         }
 450         fov_degrees = rangelim(fov_degrees, 7.0, 160.0);
 451
 452         // FOV and aspect ratio
 453         const v2u32 &window_size = RenderingEngine::get_instance()->getWindowSize();
 454         m_aspect = (f32) window_size.X / (f32) window_size.Y;
 455         m_fov_y = fov_degrees * M_PI / 180.0;
 456         // Increase vertical FOV on lower aspect ratios (<16:10)
 457         m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
 458         m_fov_x = 2 * atan(m_aspect * tan(0.5 * m_fov_y));
 459         m_cameranode->setAspectRatio(m_aspect);
 460         m_cameranode->setFOV(m_fov_y);
 461
 462         if (m_arm_inertia)
 463                 addArmInertia(player->getYaw(), frametime);
 464
 465         // Position the wielded item
 466         //v3f wield_position = v3f(45, -35, 65);
 467         v3f wield_position = v3f(m_wieldmesh_offset.X, m_wieldmesh_offset.Y, 65);
 468         //v3f wield_rotation = v3f(-100, 120, -100);
 469         v3f wield_rotation = v3f(-100, 120, -100);
 470         wield_position.Y += fabs(m_wield_change_timer)*320 - 40;
 471         if(m_digging_anim < 0.05 || m_digging_anim > 0.5)
 472         {
 473                 f32 frac = 1.0;
 474                 if(m_digging_anim > 0.5)
 475                         frac = 2.0 * (m_digging_anim - 0.5);
 476                 // This value starts from 1 and settles to 0
 477                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 478                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 479                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 480                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 481                 //wield_position.Z += frac * 5.0 * ratiothing2;
 482                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 483                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 484                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 485                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 486         }
 487         if (m_digging_button != -1)
 488         {
 489                 f32 digfrac = m_digging_anim;
 490                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 491                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 492                 wield_position.Z += 25 * 0.5;
 493
 494                 // Euler angles are PURE EVIL, so why not use quaternions?
 495                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 496                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 497                 core::quaternion quat_slerp;
 498                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 499                 quat_slerp.toEuler(wield_rotation);
 500                 wield_rotation *= core::RADTODEG;
 501         } else {
 502                 f32 bobfrac = my_modf(m_view_bobbing_anim);
 503                 wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
 504                 wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
 505         }
 506         m_wieldnode->setPosition(wield_position);
 507         m_wieldnode->setRotation(wield_rotation);
 508
 509         m_wieldnode->setColor(player->light_color);
 510
 511         // Set render distance
 512         updateViewingRange();
 513
 514         // If the player is walking, swimming, or climbing,
 515         // view bobbing is enabled and free_move is off,
 516         // start (or continue) the view bobbing animation.
 517         v3f speed = player->getSpeed();
 518         const bool movement_XZ = hypot(speed.X, speed.Z) > BS;
 519         const bool movement_Y = fabs(speed.Y) > BS;
 520
 521         const bool walking = movement_XZ && player->touching_ground;
 522         const bool swimming = (movement_XZ || player->swimming_vertical) && player->in_liquid;
 523         const bool climbing = movement_Y && player->is_climbing;
 524         if ((walking || swimming || climbing) &&
 525                         (!g_settings->getBool("free_move") || !m_client->checkLocalPrivilege("fly"))) {
 526                 // Start animation
 527                 m_view_bobbing_state = 1;
 528                 m_view_bobbing_speed = MYMIN(speed.getLength(), 70);
 529         }
 530         else if (m_view_bobbing_state == 1)
 531         {
 532                 // Stop animation
 533                 m_view_bobbing_state = 2;
 534                 m_view_bobbing_speed = 60;
 535         }
 536 }
 537
 538 void Camera::updateViewingRange()
 539 {
 540         f32 viewing_range = g_settings->getFloat("viewing_range");
 541         m_draw_control.wanted_range = viewing_range;
 542         if (m_draw_control.range_all) {
 543                 m_cameranode->setFarValue(100000.0);
 544                 return;
 545         }
 546         m_cameranode->setFarValue((viewing_range < 2000) ? 2000 * BS : viewing_range * BS);
 547 }
 548
 549 void Camera::setDigging(s32 button)
 550 {
 551         if (m_digging_button == -1)
 552                 m_digging_button = button;
 553 }
 554
 555 void Camera::wield(const ItemStack &item)
 556 {
 557         if (item.name != m_wield_item_next.name ||
 558                         item.metadata != m_wield_item_next.metadata) {
 559                 m_wield_item_next = item;
 560                 if (m_wield_change_timer > 0)
 561                         m_wield_change_timer = -m_wield_change_timer;
 562                 else if (m_wield_change_timer == 0)
 563                         m_wield_change_timer = -0.001;
 564         }
 565 }
 566
 567 void Camera::drawWieldedTool(irr::core::matrix4* translation)
 568 {
 569         // Clear Z buffer so that the wielded tool stay in front of world geometry
 570         m_wieldmgr->getVideoDriver()->clearZBuffer();
 571
 572         // Draw the wielded node (in a separate scene manager)
 573         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 574         cam->setAspectRatio(m_cameranode->getAspectRatio());
 575         cam->setFOV(72.0*M_PI/180.0);
 576         cam->setNearValue(10);
 577         cam->setFarValue(1000);
 578         if (translation != NULL)
 579         {
 580                 irr::core::matrix4 startMatrix = cam->getAbsoluteTransformation();
 581                 irr::core::vector3df focusPoint = (cam->getTarget()
 582                                 - cam->getAbsolutePosition()).setLength(1)
 583                                 + cam->getAbsolutePosition();
 584
 585                 irr::core::vector3df camera_pos =
 586                                 (startMatrix * *translation).getTranslation();
 587                 cam->setPosition(camera_pos);
 588                 cam->setTarget(focusPoint);
 589         }
 590         m_wieldmgr->drawAll();
 591 }
 592
 593 void Camera::drawNametags()
 594 {
 595         core::matrix4 trans = m_cameranode->getProjectionMatrix();
 596         trans *= m_cameranode->getViewMatrix();
 597
 598         for (std::list<Nametag *>::const_iterator
 599                         i = m_nametags.begin();
 600                         i != m_nametags.end(); ++i) {
 601                 Nametag *nametag = *i;
 602                 if (nametag->nametag_color.getAlpha() == 0) {
 603                         // Enforce hiding nametag,
 604                         // because if freetype is enabled, a grey
 605                         // shadow can remain.
 606                         continue;
 607                 }
 608                 v3f pos = nametag->parent_node->getAbsolutePosition() + v3f(0.0, 1.1 * BS, 0.0);
 609                 f32 transformed_pos[4] = { pos.X, pos.Y, pos.Z, 1.0f };
 610                 trans.multiplyWith1x4Matrix(transformed_pos);
 611                 if (transformed_pos[3] > 0) {
 612                         std::string nametag_colorless = unescape_enriched(nametag->nametag_text);
 613                         core::dimension2d<u32> textsize =
 614                                 g_fontengine->getFont()->getDimension(
 615                                 utf8_to_wide(nametag_colorless).c_str());
 616                         f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 617                                 core::reciprocal(transformed_pos[3]);
 618                         v2u32 screensize = m_driver->getScreenSize();
 619                         v2s32 screen_pos;
 620                         screen_pos.X = screensize.X *
 621                                 (0.5 * transformed_pos[0] * zDiv + 0.5) - textsize.Width / 2;
 622                         screen_pos.Y = screensize.Y *
 623                                 (0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 624                         core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
 625                         g_fontengine->getFont()->draw(utf8_to_wide(nametag->nametag_text).c_str(),
 626                                         size + screen_pos, nametag->nametag_color);
 627                 }
 628         }
 629 }
 630
 631 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 632                 std::string nametag_text, video::SColor nametag_color)
 633 {
 634         Nametag *nametag = new Nametag(parent_node, nametag_text, nametag_color);
 635         m_nametags.push_back(nametag);
 636         return nametag;
 637 }
 638
 639 void Camera::removeNametag(Nametag *nametag)
 640 {
 641         m_nametags.remove(nametag);
 642         delete nametag;
 643 }