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 "main.h" // for g_settings
  24 #include "map.h"
  25 #include "clientmap.h" // MapDrawControl
  26 #include "mesh.h"
  27 #include "player.h"
  28 #include "tile.h"
  29 #include <cmath>
  30 #include "settings.h"
  31 #include "itemdef.h" // For wield visualization
  32 #include "noise.h" // easeCurve
  33 #include "gamedef.h"
  34 #include "sound.h"
  35 #include "event.h"
  36 #include "profiler.h"
  37 #include "util/numeric.h"
  38 #include "util/mathconstants.h"
  39 #include "constants.h"
  40
  41 #define CAMERA_OFFSET_STEP 200
  42
  43 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
  44                 IGameDef *gamedef):
  45         m_smgr(smgr),
  46         m_playernode(NULL),
  47         m_headnode(NULL),
  48         m_cameranode(NULL),
  49
  50         m_wieldmgr(NULL),
  51         m_wieldnode(NULL),
  52         m_wieldlight(0),
  53
  54         m_draw_control(draw_control),
  55         m_gamedef(gamedef),
  56
  57         m_camera_position(0,0,0),
  58         m_camera_direction(0,0,0),
  59         m_camera_offset(0,0,0),
  60
  61         m_aspect(1.0),
  62         m_fov_x(1.0),
  63         m_fov_y(1.0),
  64
  65         m_added_busytime(0),
  66         m_added_frames(0),
  67         m_range_old(0),
  68         m_busytime_old(0),
  69         m_frametime_counter(0),
  70         m_time_per_range(30. / 50), // a sane default of 30ms per 50 nodes of range
  71
  72         m_view_bobbing_anim(0),
  73         m_view_bobbing_state(0),
  74         m_view_bobbing_speed(0),
  75         m_view_bobbing_fall(0),
  76
  77         m_digging_anim(0),
  78         m_digging_button(-1),
  79         m_dummymesh(createCubeMesh(v3f(1,1,1))),
  80
  81         m_wield_change_timer(0.125),
  82         m_wield_mesh_next(NULL),
  83         m_previous_playeritem(-1),
  84         m_previous_itemname("")
  85 {
  86         //dstream<<__FUNCTION_NAME<<std::endl;
  87
  88         // note: making the camera node a child of the player node
  89         // would lead to unexpected behaviour, so we don't do that.
  90         m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
  91         m_headnode = smgr->addEmptySceneNode(m_playernode);
  92         m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
  93         m_cameranode->bindTargetAndRotation(true);
  94
  95         // This needs to be in its own scene manager. It is drawn after
  96         // all other 3D scene nodes and before the GUI.
  97         m_wieldmgr = smgr->createNewSceneManager();
  98         m_wieldmgr->addCameraSceneNode();
  99         m_wieldnode = m_wieldmgr->addMeshSceneNode(m_dummymesh, NULL);  // need a dummy mesh
 100 }
 101
 102 Camera::~Camera()
 103 {
 104         m_wieldmgr->drop();
 105
 106         delete m_dummymesh;
 107 }
 108
 109 bool Camera::successfullyCreated(std::wstring& error_message)
 110 {
 111         if (m_playernode == NULL)
 112         {
 113                 error_message = L"Failed to create the player scene node";
 114                 return false;
 115         }
 116         if (m_headnode == NULL)
 117         {
 118                 error_message = L"Failed to create the head scene node";
 119                 return false;
 120         }
 121         if (m_cameranode == NULL)
 122         {
 123                 error_message = L"Failed to create the camera scene node";
 124                 return false;
 125         }
 126         if (m_wieldmgr == NULL)
 127         {
 128                 error_message = L"Failed to create the wielded item scene manager";
 129                 return false;
 130         }
 131         if (m_wieldnode == NULL)
 132         {
 133                 error_message = L"Failed to create the wielded item scene node";
 134                 return false;
 135         }
 136         return true;
 137 }
 138
 139 // Returns the fractional part of x
 140 inline f32 my_modf(f32 x)
 141 {
 142         double dummy;
 143         return modf(x, &dummy);
 144 }
 145
 146 void Camera::step(f32 dtime)
 147 {
 148         if(m_view_bobbing_fall > 0)
 149         {
 150                 m_view_bobbing_fall -= 3 * dtime;
 151                 if(m_view_bobbing_fall <= 0)
 152                         m_view_bobbing_fall = -1; // Mark the effect as finished
 153         }
 154
 155         bool was_under_zero = m_wield_change_timer < 0;
 156         if(m_wield_change_timer < 0.125)
 157                 m_wield_change_timer += dtime;
 158         if(m_wield_change_timer > 0.125)
 159                 m_wield_change_timer = 0.125;
 160
 161         if(m_wield_change_timer >= 0 && was_under_zero) {
 162                 if(m_wield_mesh_next) {
 163                         m_wieldnode->setMesh(m_wield_mesh_next);
 164                         m_wieldnode->setVisible(true);
 165                 } else {
 166                         m_wieldnode->setVisible(false);
 167                 }
 168                 m_wield_mesh_next = NULL;
 169         }
 170
 171         if (m_view_bobbing_state != 0)
 172         {
 173                 //f32 offset = dtime * m_view_bobbing_speed * 0.035;
 174                 f32 offset = dtime * m_view_bobbing_speed * 0.030;
 175                 if (m_view_bobbing_state == 2)
 176                 {
 177 #if 0
 178                         // Animation is getting turned off
 179                         if (m_view_bobbing_anim < 0.5)
 180                                 m_view_bobbing_anim -= offset;
 181                         else
 182                                 m_view_bobbing_anim += offset;
 183                         if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1)
 184                         {
 185                                 m_view_bobbing_anim = 0;
 186                                 m_view_bobbing_state = 0;
 187                         }
 188 #endif
 189 #if 1
 190                         // Animation is getting turned off
 191                         if(m_view_bobbing_anim < 0.25){
 192                                 m_view_bobbing_anim -= offset;
 193                         } else if(m_view_bobbing_anim > 0.75){
 194                                 m_view_bobbing_anim += offset;
 195                         } if(m_view_bobbing_anim < 0.5){
 196                                 m_view_bobbing_anim += offset;
 197                                 if(m_view_bobbing_anim > 0.5)
 198                                         m_view_bobbing_anim = 0.5;
 199                         } else {
 200                                 m_view_bobbing_anim -= offset;
 201                                 if(m_view_bobbing_anim < 0.5)
 202                                         m_view_bobbing_anim = 0.5;
 203                         }
 204                         if(m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
 205                                         fabs(m_view_bobbing_anim - 0.5) < 0.01)
 206                         {
 207                                 m_view_bobbing_anim = 0;
 208                                 m_view_bobbing_state = 0;
 209                         }
 210 #endif
 211                 }
 212                 else
 213                 {
 214                         float was = m_view_bobbing_anim;
 215                         m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
 216                         bool step = (was == 0 ||
 217                                         (was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
 218                                         (was > 0.5f && m_view_bobbing_anim <= 0.5f));
 219                         if(step){
 220                                 MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
 221                                 m_gamedef->event()->put(e);
 222                         }
 223                 }
 224         }
 225
 226         if (m_digging_button != -1)
 227         {
 228                 f32 offset = dtime * 3.5;
 229                 float m_digging_anim_was = m_digging_anim;
 230                 m_digging_anim += offset;
 231                 if (m_digging_anim >= 1)
 232                 {
 233                         m_digging_anim = 0;
 234                         m_digging_button = -1;
 235                 }
 236                 float lim = 0.15;
 237                 if(m_digging_anim_was < lim && m_digging_anim >= lim)
 238                 {
 239                         if(m_digging_button == 0){
 240                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
 241                                 m_gamedef->event()->put(e);
 242                         } else if(m_digging_button == 1){
 243                                 MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
 244                                 m_gamedef->event()->put(e);
 245                         }
 246                 }
 247         }
 248 }
 249
 250 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 251                 v2u32 screensize, f32 tool_reload_ratio)
 252 {
 253         // Get player position
 254         // Smooth the movement when walking up stairs
 255         v3f old_player_position = m_playernode->getPosition();
 256         v3f player_position = player->getPosition();
 257         if (player->isAttached && player->parent)
 258                 player_position = player->parent->getPosition();
 259         //if(player->touching_ground && player_position.Y > old_player_position.Y)
 260         if(player->touching_ground &&
 261                         player_position.Y > old_player_position.Y)
 262         {
 263                 f32 oldy = old_player_position.Y;
 264                 f32 newy = player_position.Y;
 265                 f32 t = exp(-23*frametime);
 266                 player_position.Y = oldy * t + newy * (1-t);
 267         }
 268
 269         // Set player node transformation
 270         m_playernode->setPosition(player_position);
 271         m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
 272         m_playernode->updateAbsolutePosition();
 273
 274         // Get camera tilt timer (hurt animation)
 275         float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);
 276
 277         // Fall bobbing animation
 278         float fall_bobbing = 0;
 279         if(player->camera_impact >= 1)
 280         {
 281                 if(m_view_bobbing_fall == -1) // Effect took place and has finished
 282                         player->camera_impact = m_view_bobbing_fall = 0;
 283                 else if(m_view_bobbing_fall == 0) // Initialize effect
 284                         m_view_bobbing_fall = 1;
 285
 286                 // Convert 0 -> 1 to 0 -> 1 -> 0
 287                 fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
 288                 // Smoothen and invert the above
 289                 fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 290                 // Amplify according to the intensity of the impact
 291                 fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 292
 293                 fall_bobbing *= g_settings->getFloat("fall_bobbing_amount");
 294         }
 295
 296         // Set head node transformation
 297         m_headnode->setPosition(player->getEyeOffset()+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
 298         m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
 299         m_headnode->updateAbsolutePosition();
 300
 301         // Compute relative camera position and target
 302         v3f rel_cam_pos = v3f(0,0,0);
 303         v3f rel_cam_target = v3f(0,0,1);
 304         v3f rel_cam_up = v3f(0,1,0);
 305
 306         if (m_view_bobbing_anim != 0)
 307         {
 308                 f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
 309                 f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;
 310
 311                 #if 1
 312                 f32 bobknob = 1.2;
 313                 f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
 314                 //f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);
 315
 316                 v3f bobvec = v3f(
 317                         0.3 * bobdir * sin(bobfrac * M_PI),
 318                         -0.28 * bobtmp * bobtmp,
 319                         0.);
 320
 321                 //rel_cam_pos += 0.2 * bobvec;
 322                 //rel_cam_target += 0.03 * bobvec;
 323                 //rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
 324                 float f = 1.0;
 325                 f *= g_settings->getFloat("view_bobbing_amount");
 326                 rel_cam_pos += bobvec * f;
 327                 //rel_cam_target += 0.995 * bobvec * f;
 328                 rel_cam_target += bobvec * f;
 329                 rel_cam_target.Z -= 0.005 * bobvec.Z * f;
 330                 //rel_cam_target.X -= 0.005 * bobvec.X * f;
 331                 //rel_cam_target.Y -= 0.005 * bobvec.Y * f;
 332                 rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
 333                 #else
 334                 f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
 335                 f32 angle_rad = angle_deg * M_PI / 180;
 336                 f32 r = 0.05;
 337                 v3f off = v3f(
 338                         r * sin(angle_rad),
 339                         r * (cos(angle_rad) - 1),
 340                         0);
 341                 rel_cam_pos += off;
 342                 //rel_cam_target += off;
 343                 rel_cam_up.rotateXYBy(angle_deg);
 344                 #endif
 345
 346         }
 347
 348         // Compute absolute camera position and target
 349         m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
 350         m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);
 351
 352         v3f abs_cam_up;
 353         m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);
 354
 355         // Update offset if too far away from the center of the map
 356         m_camera_offset.X += CAMERA_OFFSET_STEP*
 357                         (((s16)(m_camera_position.X/BS) - m_camera_offset.X)/CAMERA_OFFSET_STEP);
 358         m_camera_offset.Y += CAMERA_OFFSET_STEP*
 359                         (((s16)(m_camera_position.Y/BS) - m_camera_offset.Y)/CAMERA_OFFSET_STEP);
 360         m_camera_offset.Z += CAMERA_OFFSET_STEP*
 361                         (((s16)(m_camera_position.Z/BS) - m_camera_offset.Z)/CAMERA_OFFSET_STEP);
 362
 363         // Set camera node transformation
 364         m_cameranode->setPosition(m_camera_position-intToFloat(m_camera_offset, BS));
 365         m_cameranode->setUpVector(abs_cam_up);
 366         // *100.0 helps in large map coordinates
 367         m_cameranode->setTarget(m_camera_position-intToFloat(m_camera_offset, BS) + 100 * m_camera_direction);
 368
 369         // Get FOV setting
 370         f32 fov_degrees = g_settings->getFloat("fov");
 371         fov_degrees = MYMAX(fov_degrees, 10.0);
 372         fov_degrees = MYMIN(fov_degrees, 170.0);
 373
 374         // FOV and aspect ratio
 375         m_aspect = (f32)screensize.X / (f32) screensize.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         // Position the wielded item
 384         //v3f wield_position = v3f(45, -35, 65);
 385         v3f wield_position = v3f(55, -35, 65);
 386         //v3f wield_rotation = v3f(-100, 120, -100);
 387         v3f wield_rotation = v3f(-100, 120, -100);
 388         if(m_wield_change_timer < 0)
 389                 wield_position.Y -= 40 + m_wield_change_timer*320;
 390         else
 391                 wield_position.Y -= 40 - m_wield_change_timer*320;
 392         if(m_digging_anim < 0.05 || m_digging_anim > 0.5){
 393                 f32 frac = 1.0;
 394                 if(m_digging_anim > 0.5)
 395                         frac = 2.0 * (m_digging_anim - 0.5);
 396                 // This value starts from 1 and settles to 0
 397                 f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
 398                 //f32 ratiothing2 = pow(ratiothing, 0.5f);
 399                 f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
 400                 wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
 401                 //wield_position.Z += frac * 5.0 * ratiothing2;
 402                 wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
 403                 wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
 404                 //wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
 405                 //wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
 406         }
 407         if (m_digging_button != -1)
 408         {
 409                 f32 digfrac = m_digging_anim;
 410                 wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
 411                 wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
 412                 wield_position.Z += 25 * 0.5;
 413
 414                 // Euler angles are PURE EVIL, so why not use quaternions?
 415                 core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
 416                 core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
 417                 core::quaternion quat_slerp;
 418                 quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
 419                 quat_slerp.toEuler(wield_rotation);
 420                 wield_rotation *= core::RADTODEG;
 421         }
 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         m_wieldlight = player->light;
 430
 431         // Render distance feedback loop
 432         updateViewingRange(frametime, busytime);
 433
 434         // If the player seems to be walking on solid ground,
 435         // view bobbing is enabled and free_move is off,
 436         // start (or continue) the view bobbing animation.
 437         v3f speed = player->getSpeed();
 438         if ((hypot(speed.X, speed.Z) > BS) &&
 439                 (player->touching_ground) &&
 440                 (g_settings->getBool("view_bobbing") == true) &&
 441                 (g_settings->getBool("free_move") == false ||
 442                                 !m_gamedef->checkLocalPrivilege("fly")))
 443         {
 444                 // Start animation
 445                 m_view_bobbing_state = 1;
 446                 m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
 447         }
 448         else if (m_view_bobbing_state == 1)
 449         {
 450                 // Stop animation
 451                 m_view_bobbing_state = 2;
 452                 m_view_bobbing_speed = 60;
 453         }
 454 }
 455
 456 void Camera::updateViewingRange(f32 frametime_in, f32 busytime_in)
 457 {
 458         if (m_draw_control.range_all)
 459                 return;
 460
 461         m_added_busytime += busytime_in;
 462         m_added_frames += 1;
 463
 464         m_frametime_counter -= frametime_in;
 465         if (m_frametime_counter > 0)
 466                 return;
 467         m_frametime_counter = 0.2; // Same as ClientMap::updateDrawList interval
 468
 469         /*dstream<<__FUNCTION_NAME
 470                         <<": Collected "<<m_added_frames<<" frames, total of "
 471                         <<m_added_busytime<<"s."<<std::endl;
 472
 473         dstream<<"m_draw_control.blocks_drawn="
 474                         <<m_draw_control.blocks_drawn
 475                         <<", m_draw_control.blocks_would_have_drawn="
 476                         <<m_draw_control.blocks_would_have_drawn
 477                         <<std::endl;*/
 478
 479         // Get current viewing range and FPS settings
 480         f32 viewing_range_min = g_settings->getS16("viewing_range_nodes_min");
 481         viewing_range_min = MYMAX(15.0, viewing_range_min);
 482
 483         f32 viewing_range_max = g_settings->getS16("viewing_range_nodes_max");
 484         viewing_range_max = MYMAX(viewing_range_min, viewing_range_max);
 485
 486         // Immediately apply hard limits
 487         if(m_draw_control.wanted_range < viewing_range_min)
 488                 m_draw_control.wanted_range = viewing_range_min;
 489         if(m_draw_control.wanted_range > viewing_range_max)
 490                 m_draw_control.wanted_range = viewing_range_max;
 491
 492         // Just so big a value that everything rendered is visible
 493         // Some more allowance than viewing_range_max * BS because of clouds,
 494         // active objects, etc.
 495         if(viewing_range_max < 200*BS)
 496                 m_cameranode->setFarValue(200 * BS * 10);
 497         else
 498                 m_cameranode->setFarValue(viewing_range_max * BS * 10);
 499
 500         f32 wanted_fps = g_settings->getFloat("wanted_fps");
 501         wanted_fps = MYMAX(wanted_fps, 1.0);
 502         f32 wanted_frametime = 1.0 / wanted_fps;
 503
 504         m_draw_control.wanted_min_range = viewing_range_min;
 505         m_draw_control.wanted_max_blocks = (2.0*m_draw_control.blocks_would_have_drawn)+1;
 506         if (m_draw_control.wanted_max_blocks < 10)
 507                 m_draw_control.wanted_max_blocks = 10;
 508
 509         f32 block_draw_ratio = 1.0;
 510         if (m_draw_control.blocks_would_have_drawn != 0)
 511         {
 512                 block_draw_ratio = (f32)m_draw_control.blocks_drawn
 513                         / (f32)m_draw_control.blocks_would_have_drawn;
 514         }
 515
 516         // Calculate the average frametime in the case that all wanted
 517         // blocks had been drawn
 518         f32 frametime = m_added_busytime / m_added_frames / block_draw_ratio;
 519
 520         m_added_busytime = 0.0;
 521         m_added_frames = 0;
 522
 523         f32 wanted_frametime_change = wanted_frametime - frametime;
 524         //dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl;
 525         g_profiler->avg("wanted_frametime_change", wanted_frametime_change);
 526
 527         // If needed frametime change is small, just return
 528         // This value was 0.4 for many months until 2011-10-18 by c55;
 529         if (fabs(wanted_frametime_change) < wanted_frametime*0.33)
 530         {
 531                 //dstream<<"ignoring small wanted_frametime_change"<<std::endl;
 532                 return;
 533         }
 534
 535         f32 range = m_draw_control.wanted_range;
 536         f32 new_range = range;
 537
 538         f32 d_range = range - m_range_old;
 539         f32 d_busytime = busytime_in - m_busytime_old;
 540         if (d_range != 0)
 541         {
 542                 m_time_per_range = d_busytime / d_range;
 543         }
 544         //dstream<<"time_per_range="<<m_time_per_range<<std::endl;
 545         g_profiler->avg("time_per_range", m_time_per_range);
 546
 547         // The minimum allowed calculated frametime-range derivative:
 548         // Practically this sets the maximum speed of changing the range.
 549         // The lower this value, the higher the maximum changing speed.
 550         // A low value here results in wobbly range (0.001)
 551         // A low value can cause oscillation in very nonlinear time/range curves.
 552         // A high value here results in slow changing range (0.0025)
 553         // SUGG: This could be dynamically adjusted so that when
 554         //       the camera is turning, this is lower
 555         //f32 min_time_per_range = 0.0010; // Up to 0.4.7
 556         f32 min_time_per_range = 0.0005;
 557         if(m_time_per_range < min_time_per_range)
 558         {
 559                 m_time_per_range = min_time_per_range;
 560                 //dstream<<"m_time_per_range="<<m_time_per_range<<" (min)"<<std::endl;
 561         }
 562         else
 563         {
 564                 //dstream<<"m_time_per_range="<<m_time_per_range<<std::endl;
 565         }
 566
 567         f32 wanted_range_change = wanted_frametime_change / m_time_per_range;
 568         // Dampen the change a bit to kill oscillations
 569         //wanted_range_change *= 0.9;
 570         //wanted_range_change *= 0.75;
 571         wanted_range_change *= 0.5;
 572         //dstream<<"wanted_range_change="<<wanted_range_change<<std::endl;
 573
 574         // If needed range change is very small, just return
 575         if(fabs(wanted_range_change) < 0.001)
 576         {
 577                 //dstream<<"ignoring small wanted_range_change"<<std::endl;
 578                 return;
 579         }
 580
 581         new_range += wanted_range_change;
 582
 583         //f32 new_range_unclamped = new_range;
 584         new_range = MYMAX(new_range, viewing_range_min);
 585         new_range = MYMIN(new_range, viewing_range_max);
 586         /*dstream<<"new_range="<<new_range_unclamped
 587                         <<", clamped to "<<new_range<<std::endl;*/
 588
 589         m_range_old = m_draw_control.wanted_range;
 590         m_busytime_old = busytime_in;
 591
 592         m_draw_control.wanted_range = new_range;
 593 }
 594
 595 void Camera::setDigging(s32 button)
 596 {
 597         if (m_digging_button == -1)
 598                 m_digging_button = button;
 599 }
 600
 601 void Camera::wield(const ItemStack &item, u16 playeritem)
 602 {
 603         IItemDefManager *idef = m_gamedef->idef();
 604         std::string itemname = item.getDefinition(idef).name;
 605         m_wield_mesh_next = idef->getWieldMesh(itemname, m_gamedef);
 606         if(playeritem != m_previous_playeritem &&
 607                         !(m_previous_itemname == "" && itemname == "")) {
 608                 m_previous_playeritem = playeritem;
 609                 m_previous_itemname = itemname;
 610                 if(m_wield_change_timer >= 0.125)
 611                         m_wield_change_timer = -0.125;
 612                 else if(m_wield_change_timer > 0) {
 613                         m_wield_change_timer = -m_wield_change_timer;
 614                 }
 615         } else {
 616                 if(m_wield_mesh_next) {
 617                         m_wieldnode->setMesh(m_wield_mesh_next);
 618                         m_wieldnode->setVisible(true);
 619                 } else {
 620                         m_wieldnode->setVisible(false);
 621                 }
 622                 m_wield_mesh_next = NULL;
 623                 if(m_previous_itemname != itemname) {
 624                         m_previous_itemname = itemname;
 625                         m_wield_change_timer = 0;
 626                 }
 627                 else
 628                         m_wield_change_timer = 0.125;
 629         }
 630 }
 631
 632 void Camera::drawWieldedTool()
 633 {
 634         // Set vertex colors of wield mesh according to light level
 635         u8 li = m_wieldlight;
 636         video::SColor color(255,li,li,li);
 637         setMeshColor(m_wieldnode->getMesh(), color);
 638
 639         // Clear Z buffer
 640         m_wieldmgr->getVideoDriver()->clearZBuffer();
 641
 642         // Draw the wielded node (in a separate scene manager)
 643         scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
 644         cam->setAspectRatio(m_cameranode->getAspectRatio());
 645         cam->setFOV(72.0*M_PI/180.0);
 646         cam->setNearValue(0.1);
 647         cam->setFarValue(100);
 648         m_wieldmgr->drawAll();
 649 }