qcsrc/ecs/systems/physics.qc

   1 #include "physics.qh"
   2 #include "input.qh"
   3
   4 .int disableclientprediction;
   5
   6 void sys_phys_simulate(entity this, float dt);
   7 void sys_phys_simulate_simple(entity this, float dt);
   8
   9 void sys_phys_update(entity this, float dt)
  10 {
  11         if (!IS_CLIENT(this)) {
  12                 sys_phys_simulate_simple(this, dt);
  13                 return;
  14         }
  15         sys_in_update(this, dt);
  16
  17         sys_phys_fix(this, dt);
  18         if (sys_phys_override(this, dt))
  19                 return;
  20
  21         sys_phys_monitor(this, dt);
  22
  23         PHYS_CS(this).movement_old = PHYS_CS(this).movement;
  24         PHYS_CS(this).v_angle_old = this.v_angle;
  25         PHYS_CS(this).buttons_old = PHYS_INPUT_BUTTON_MASK(this);
  26
  27         sys_phys_ai(this);
  28
  29         sys_phys_pregame_hold(this);
  30
  31         if (IS_SVQC) {
  32                 if (this.move_movetype == MOVETYPE_NONE) { return; }
  33                 // when we get here, disableclientprediction cannot be 2
  34                 this.disableclientprediction = (this.move_qcphysics) ? -1 : 0;
  35         }
  36
  37         viewloc_PlayerPhysics(this);
  38
  39         PM_check_frozen(this);
  40
  41         PM_check_blocked(this);
  42
  43         float maxspeed_mod = (!this.in_swamp) ? 1 : this.swamp_slowdown;  // cvar("g_balance_swamp_moverate");
  44
  45 // conveyors: first fix velocity
  46         if (this.conveyor.state) { this.velocity -= this.conveyor.movedir; }
  47         MUTATOR_CALLHOOK(PlayerPhysics, this, dt);
  48
  49         if (!IS_PLAYER(this)) {
  50                 sys_phys_spectator_control(this);
  51                 maxspeed_mod = this.spectatorspeed;
  52         }
  53         sys_phys_fixspeed(this, maxspeed_mod);
  54
  55         if (IS_DEAD(this)) {
  56                 // handle water here
  57                 vector midpoint = ((this.absmin + this.absmax) * 0.5);
  58                 int cont = pointcontents(midpoint);
  59                 if (cont == CONTENT_WATER || cont == CONTENT_LAVA || cont == CONTENT_SLIME) {
  60                         this.velocity = this.velocity * 0.5;
  61
  62                         // do we want this?
  63                         // if(pointcontents(midpoint + '0 0 2') == CONTENT_WATER)
  64                         // { this.velocity_z = 70; }
  65                 }
  66                 goto end;
  67         }
  68
  69         PM_check_slick(this);
  70
  71         if (IS_SVQC && !PHYS_FIXANGLE(this)) { this.angles = '0 1 0' * this.v_angle.y; }
  72         if (IS_PLAYER(this)) {
  73                 if (IS_ONGROUND(this)) {
  74                         PM_check_hitground(this);
  75                         PM_Footsteps(this);
  76                 } else if (IsFlying(this)) {
  77                         this.wasFlying = true;
  78                 }
  79                 CheckPlayerJump(this);
  80         }
  81
  82         if (this.flags & FL_WATERJUMP) {
  83                 this.velocity_x = this.movedir.x;
  84                 this.velocity_y = this.movedir.y;
  85                 if (this.waterlevel == WATERLEVEL_NONE
  86                     || time > PHYS_TELEPORT_TIME(this)
  87                     || PHYS_WATERJUMP_TIME(this) <= 0
  88                    ) {
  89                         this.flags &= ~FL_WATERJUMP;
  90                         PHYS_TELEPORT_TIME(this) = 0;
  91                         PHYS_WATERJUMP_TIME(this) = 0;
  92                 }
  93         } else if (MUTATOR_CALLHOOK(PM_Physics, this, maxspeed_mod, dt)) {
  94                 // handled
  95         } else if (this.move_movetype == MOVETYPE_NOCLIP
  96             || this.move_movetype == MOVETYPE_FLY
  97             || this.move_movetype == MOVETYPE_FLY_WORLDONLY
  98             || MUTATOR_CALLHOOK(IsFlying, this)) {
  99                 this.com_phys_friction = PHYS_FRICTION(this);
 100                 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
 101                 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
 102                 this.com_phys_friction_air = true;
 103                 sys_phys_simulate(this, dt);
 104                 this.com_phys_friction_air = false;
 105         } else if (this.waterlevel >= WATERLEVEL_SWIMMING) {
 106                 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
 107                 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
 108                 this.com_phys_water = true;
 109                 sys_phys_simulate(this, dt);
 110                 this.com_phys_water = false;
 111         } else if (time < this.ladder_time) {
 112                 this.com_phys_friction = PHYS_FRICTION(this);
 113                 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
 114                 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
 115                 this.com_phys_gravity = '0 0 -1' * PHYS_GRAVITY(this) * dt;
 116                 if (PHYS_ENTGRAVITY(this)) { this.com_phys_gravity *= PHYS_ENTGRAVITY(this); }
 117                 this.com_phys_ladder = true;
 118                 this.com_phys_friction_air = true;
 119                 sys_phys_simulate(this, dt);
 120                 this.com_phys_friction_air = false;
 121                 this.com_phys_ladder = false;
 122                 this.com_phys_gravity = '0 0 0';
 123         } else if (ITEMS_STAT(this) & IT_USING_JETPACK) {
 124                 PM_jetpack(this, maxspeed_mod, dt);
 125         } else if (IS_ONGROUND(this)) {
 126                 if (!WAS_ONGROUND(this)) {
 127                         emit(phys_land, this);
 128                         if (this.lastground < time - 0.3) {
 129                                 this.velocity *= (1 - PHYS_FRICTION_ONLAND(this));
 130                         }
 131                 }
 132                 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
 133                 this.com_phys_gravity = '0 0 -1' * PHYS_GRAVITY(this) * dt;
 134                 if (PHYS_ENTGRAVITY(this)) { this.com_phys_gravity *= PHYS_ENTGRAVITY(this); }
 135                 this.com_phys_ground = true;
 136                 this.com_phys_vel_2d = true;
 137                 sys_phys_simulate(this, dt);
 138                 this.com_phys_vel_2d = false;
 139                 this.com_phys_ground = false;
 140                 this.com_phys_gravity = '0 0 0';
 141         } else {
 142                 this.com_phys_acc_rate_air = PHYS_AIRACCELERATE(this) * min(maxspeed_mod, 1);
 143                 this.com_phys_acc_rate_air_stop = PHYS_AIRSTOPACCELERATE(this) * maxspeed_mod;
 144                 this.com_phys_acc_rate_air_strafe = PHYS_AIRSTRAFEACCELERATE(this) * maxspeed_mod;
 145                 this.com_phys_vel_max_air_strafe = PHYS_MAXAIRSTRAFESPEED(this) * maxspeed_mod;
 146                 this.com_phys_vel_max_air = PHYS_MAXAIRSPEED(this) * maxspeed_mod;
 147                 this.com_phys_vel_max = PHYS_MAXAIRSPEED(this) * min(maxspeed_mod, 1);
 148                 this.com_phys_air = true;
 149                 this.com_phys_vel_2d = true;
 150                 sys_phys_simulate(this, dt);
 151                 this.com_phys_vel_2d = false;
 152                 this.com_phys_air = false;
 153         }
 154
 155         LABEL(end)
 156         if (IS_ONGROUND(this)) { this.lastground = time; }
 157 // conveyors: then break velocity again
 158         if (this.conveyor.state) { this.velocity += this.conveyor.movedir; }
 159         this.lastflags = this.flags;
 160
 161         this.lastclassname = this.classname;
 162 }
 163
 164 /** for players */
 165 void sys_phys_simulate(entity this, float dt)
 166 {
 167         if (!this.com_phys_ground && !this.com_phys_air) {
 168                 // noclipping
 169                 // flying
 170                 // on a spawnfunc_func_ladder
 171                 // swimming in spawnfunc_func_water
 172                 // swimming
 173                 UNSET_ONGROUND(this);
 174
 175                 if (this.com_phys_friction_air) {
 176                         const vector g = -this.com_phys_gravity;
 177                         this.velocity_z += g.z / 2;
 178                         this.velocity = this.velocity * (1 - dt * this.com_phys_friction);
 179                         this.velocity_z += g.z / 2;
 180                 }
 181         }
 182
 183         if (this.com_phys_water) {
 184                 // water jump only in certain situations
 185                 // this mimics quakeworld code
 186                 if (this.com_in_jump && this.waterlevel == WATERLEVEL_SWIMMING && this.velocity_z >= -180 && !this.viewloc) {
 187                         vector yawangles = '0 1 0' * this.v_angle.y;
 188                         makevectors(yawangles);
 189                         vector forward = v_forward;
 190                         vector spot = this.origin + 24 * forward;
 191                         spot_z += 8;
 192                         traceline(spot, spot, MOVE_NOMONSTERS, this);
 193                         if (trace_startsolid) {
 194                                 spot_z += 24;
 195                                 traceline(spot, spot, MOVE_NOMONSTERS, this);
 196                                 if (!trace_startsolid) {
 197                                         this.velocity = forward * 50;
 198                                         this.velocity_z = 310;
 199                                         UNSET_ONGROUND(this);
 200                                         SET_JUMP_HELD(this);
 201                                 }
 202                         }
 203                 }
 204         }
 205         makevectors(vmul(this.v_angle, (this.com_phys_vel_2d ? '0 1 0' : '1 1 1')));
 206         // wishvel = v_forward * PHYS_CS(this).movement.x + v_right * PHYS_CS(this).movement.y + v_up * PHYS_CS(this).movement.z;
 207         vector wishvel = v_forward * PHYS_CS(this).movement.x
 208             + v_right * PHYS_CS(this).movement.y
 209             + '0 0 1' * PHYS_CS(this).movement.z * (this.com_phys_vel_2d ? 0 : 1);
 210         if (this.com_phys_water) {
 211                 if (PHYS_INPUT_BUTTON_CROUCH(this)) {
 212                         wishvel.z = -PHYS_MAXSPEED(this);
 213                 }
 214                 if (this.viewloc) {
 215                         wishvel.z = -160;    // drift anyway
 216                 } else if (wishvel == '0 0 0') {
 217                         wishvel = '0 0 -60'; // drift towards bottom
 218                 }
 219         }
 220         if (this.com_phys_ladder) {
 221                 if (this.viewloc) {
 222                         wishvel.z = PHYS_CS(this).movement_old.x;
 223                 }
 224                 if (this.ladder_entity.classname == "func_water") {
 225                         float f = vlen(wishvel);
 226                         if (f > this.ladder_entity.speed) {
 227                                 wishvel *= (this.ladder_entity.speed / f);
 228                         }
 229
 230                         this.watertype = this.ladder_entity.skin;
 231                         f = this.ladder_entity.origin_z + this.ladder_entity.maxs_z;
 232                         if ((this.origin_z + this.view_ofs_z) < f) {
 233                                 this.waterlevel = WATERLEVEL_SUBMERGED;
 234                         } else if ((this.origin_z + (this.mins_z + this.maxs_z) * 0.5) < f) {
 235                                 this.waterlevel = WATERLEVEL_SWIMMING;
 236                         } else if ((this.origin_z + this.mins_z + 1) < f) {
 237                                 this.waterlevel = WATERLEVEL_WETFEET;
 238                         } else {
 239                                 this.waterlevel = WATERLEVEL_NONE;
 240                                 this.watertype = CONTENT_EMPTY;
 241                         }
 242                 }
 243         }
 244         // acceleration
 245         const vector wishdir = normalize(wishvel);
 246         float wishspeed = min(vlen(wishvel), this.com_phys_vel_max);
 247
 248         if (this.com_phys_air) {
 249                 if ((IS_SVQC && time >= PHYS_TELEPORT_TIME(this))
 250                     ||  (IS_CSQC && PHYS_WATERJUMP_TIME(this) <= 0)) {
 251                         // apply air speed limit
 252                         float airaccelqw = PHYS_AIRACCEL_QW(this);
 253                         float wishspeed0 = wishspeed;
 254                         const float maxairspd = this.com_phys_vel_max;
 255                         wishspeed = min(wishspeed, maxairspd);
 256                         if (IS_DUCKED(this)) {
 257                                 wishspeed *= 0.5;
 258                         }
 259                         float airaccel = this.com_phys_acc_rate_air;
 260
 261                         float accelerating = (this.velocity * wishdir > 0);
 262                         float wishspeed2 = wishspeed;
 263
 264                         // CPM: air control
 265                         if (PHYS_AIRSTOPACCELERATE(this)) {
 266                                 vector curdir = normalize(vec2(this.velocity));
 267                                 airaccel += (this.com_phys_acc_rate_air_stop - airaccel) * max(0, -(curdir * wishdir));
 268                         }
 269                         // note that for straight forward jumping:
 270                         // step = accel * dt * wishspeed0;
 271                         // accel  = bound(0, wishspeed - vel_xy_current, step) * accelqw + step * (1 - accelqw);
 272                         // -->
 273                         // dv/dt = accel * maxspeed (when slow)
 274                         // dv/dt = accel * maxspeed * (1 - accelqw) (when fast)
 275                         // log dv/dt = logaccel + logmaxspeed (when slow)
 276                         // log dv/dt = logaccel + logmaxspeed + log(1 - accelqw) (when fast)
 277                         float strafity = IsMoveInDirection(PHYS_CS(this).movement, -90) + IsMoveInDirection(PHYS_CS(this).movement, +90);  // if one is nonzero, other is always zero
 278                         if (PHYS_MAXAIRSTRAFESPEED(this)) {
 279                                 wishspeed =
 280                                     min(wishspeed,
 281                                         GeomLerp(this.com_phys_vel_max_air, strafity, this.com_phys_vel_max_air_strafe));
 282                         }
 283                         if (PHYS_AIRSTRAFEACCELERATE(this)) {
 284                                 airaccel = GeomLerp(airaccel, strafity, this.com_phys_acc_rate_air_strafe);
 285                         }
 286                         if (PHYS_AIRSTRAFEACCEL_QW(this)) {
 287                                 airaccelqw =
 288                                     (((strafity > 0.5 ? PHYS_AIRSTRAFEACCEL_QW(this) : PHYS_AIRACCEL_QW(this)) >= 0) ? +1 : -1)
 289                                     *
 290                                     (1 - GeomLerp(1 - fabs(PHYS_AIRACCEL_QW(this)), strafity, 1 - fabs(PHYS_AIRSTRAFEACCEL_QW(this))));
 291                         }
 292                         // !CPM
 293
 294                         if (PHYS_WARSOWBUNNY_TURNACCEL(this) && accelerating && PHYS_CS(this).movement.y == 0 && PHYS_CS(this).movement.x != 0) {
 295                                 PM_AirAccelerate(this, dt, wishdir, wishspeed2);
 296                         } else {
 297                                 float sidefric = maxairspd ? (PHYS_AIRACCEL_SIDEWAYS_FRICTION(this) / maxairspd) : 0;
 298                                 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed0, airaccel, airaccelqw,
 299                                         PHYS_AIRACCEL_QW_STRETCHFACTOR(this), sidefric, PHYS_AIRSPEEDLIMIT_NONQW(this));
 300                         }
 301
 302                         if (PHYS_AIRCONTROL(this)) {
 303                                 CPM_PM_Aircontrol(this, dt, wishdir, wishspeed2);
 304                         }
 305                 }
 306         } else {
 307                 if (this.com_phys_ground && IS_DUCKED(this)) { wishspeed *= 0.5; }
 308                 if (this.com_phys_water) {
 309                         wishspeed *= 0.7;
 310
 311                         //      if (PHYS_WATERJUMP_TIME(this) <= 0) // TODO: use
 312                         {
 313                                 // water friction
 314                                 float f = 1 - dt * PHYS_FRICTION(this);
 315                                 f = min(max(0, f), 1);
 316                                 this.velocity *= f;
 317
 318                                 f = wishspeed - this.velocity * wishdir;
 319                                 if (f > 0) {
 320                                         float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, f);
 321                                         this.velocity += accelspeed * wishdir;
 322                                 }
 323
 324                                 // holding jump button swims upward slowly
 325                                 if (this.com_in_jump && !this.viewloc) {
 326                                         // was:
 327                                         // lava: 50
 328                                         // slime: 80
 329                                         // water: 100
 330                                         // idea: double those
 331                                         this.velocity_z = 200;
 332                                         if (this.waterlevel >= WATERLEVEL_SUBMERGED) {
 333                                                 this.velocity_z = PHYS_MAXSPEED(this) * 0.7;
 334                                         }
 335                                 }
 336                         }
 337                         if (this.viewloc) {
 338                                 const float addspeed = wishspeed - this.velocity * wishdir;
 339                                 if (addspeed > 0) {
 340                                         const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
 341                                         this.velocity += accelspeed * wishdir;
 342                                 }
 343                         } else {
 344                                 // water acceleration
 345                                 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
 346                         }
 347                         return;
 348                 }
 349                 if (this.com_phys_ground) {
 350                         // apply edge friction
 351                         const float f2 = vlen2(vec2(this.velocity));
 352                         if (f2 > 0) {
 353                                 trace_dphitq3surfaceflags = 0;
 354                                 tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
 355                                 // TODO: apply edge friction
 356                                 // apply ground friction
 357                                 const int realfriction = (trace_dphitq3surfaceflags & Q3SURFACEFLAG_SLICK)
 358                                     ? PHYS_FRICTION_SLICK(this)
 359                                         : PHYS_FRICTION(this);
 360
 361                                 float f = sqrt(f2);
 362                                 f = 1 - dt * realfriction
 363                                     * ((f < PHYS_STOPSPEED(this)) ? (PHYS_STOPSPEED(this) / f) : 1);
 364                                 f = max(0, f);
 365                                 this.velocity *= f;
 366                                 /*
 367                                    Mathematical analysis time!
 368
 369                                    Our goal is to invert this mess.
 370
 371                                    For the two cases we get:
 372                                     v = v0 * (1 - dt * (PHYS_STOPSPEED(this) / v0) * PHYS_FRICTION(this))
 373                                       = v0 - dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
 374                                     v0 = v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
 375                                    and
 376                                     v = v0 * (1 - dt * PHYS_FRICTION(this))
 377                                     v0 = v / (1 - dt * PHYS_FRICTION(this))
 378
 379                                    These cases would be chosen ONLY if:
 380                                     v0 < PHYS_STOPSPEED(this)
 381                                     v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this) < PHYS_STOPSPEED(this)
 382                                     v < PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
 383                                    and, respectively:
 384                                     v0 >= PHYS_STOPSPEED(this)
 385                                     v / (1 - dt * PHYS_FRICTION(this)) >= PHYS_STOPSPEED(this)
 386                                     v >= PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
 387                                  */
 388                         }
 389                         const float addspeed = wishspeed - this.velocity * wishdir;
 390                         if (addspeed > 0) {
 391                                 const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
 392                                 this.velocity += accelspeed * wishdir;
 393                         }
 394                         return;
 395                 }
 396
 397                 if (IS_CSQC ? PHYS_WATERJUMP_TIME(this) <= 0 : time >= PHYS_TELEPORT_TIME(this)) {
 398                         PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
 399                 }
 400         }
 401 }
 402
 403 .entity groundentity;
 404 /** for other entities */
 405 void sys_phys_simulate_simple(entity this, float dt)
 406 {
 407         vector mn = this.mins;
 408         vector mx = this.maxs;
 409
 410         vector g = '0 0 0';
 411         if (this.com_phys_gravity_factor && !g) g = '0 0 -1' * PHYS_GRAVITY(NULL);
 412
 413         vector acc = this.com_phys_acc;
 414         vector vel = this.com_phys_vel;
 415         vector pos = this.com_phys_pos;
 416
 417         // SV_Physics_Toss
 418
 419         vel += g * dt;
 420
 421         this.angles += dt * this.avelocity;
 422         float movetime = dt;
 423         for (int i = 0; i < MAX_CLIP_PLANES && movetime > 0; i++) {
 424                 vector push = vel * movetime;
 425                 vector p0 = pos;
 426                 vector p1 = p0 + push;
 427                 // SV_PushEntity
 428                 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
 429                 if (!trace_startsolid) {
 430                         bool hit = trace_fraction < 1;
 431                         pos = trace_endpos;
 432                         entity ent = trace_ent;
 433                         // SV_LinkEdict_TouchAreaGrid
 434                         if (this.solid != SOLID_NOT) {
 435                                 FOREACH_ENTITY_RADIUS_ORDERED(0.5 * (this.absmin + this.absmax), 0.5 * vlen(this.absmax - this.absmin), true, {
 436                                         if (it.solid != SOLID_TRIGGER || it == this) continue;
 437                                         if (gettouch(it) && boxesoverlap(it.absmin, it.absmax, this.absmin, this.absmax)) {
 438                                             // SV_LinkEdict_TouchAreaGrid_Call
 439                                             trace_allsolid = false;
 440                                             trace_startsolid = false;
 441                                             trace_fraction = 1;
 442                                             trace_inwater = false;
 443                                             trace_inopen = true;
 444                                             trace_endpos = it.origin;
 445                                             trace_plane_normal = '0 0 1';
 446                                             trace_plane_dist = 0;
 447                                             trace_ent = this;
 448                                             trace_dpstartcontents = 0;
 449                                             trace_dphitcontents = 0;
 450                                             trace_dphitq3surfaceflags = 0;
 451                                             trace_dphittexturename = string_null;
 452                                             gettouch(it)(this, it);
 453                                             vel = this.velocity;
 454                                         }
 455                                 });
 456                         }
 457                         if (hit && this.solid >= SOLID_TRIGGER && (!IS_ONGROUND(this) || this.groundentity != ent)) {
 458                                 // SV_Impact (ent, trace);
 459                                 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
 460                                 void(entity, entity) touched = gettouch(this);
 461                                 if (touched && this.solid != SOLID_NOT) {
 462                                         touched(ent, this);
 463                                 }
 464                                 void(entity, entity) touched2 = gettouch(ent);
 465                                 if (this && ent && touched2 && ent.solid != SOLID_NOT) {
 466                                         trace_endpos = ent.origin;
 467                                         trace_plane_normal *= -1;
 468                                         trace_plane_dist *= -1;
 469                                         trace_ent = this;
 470                                         trace_dpstartcontents = 0;
 471                                         trace_dphitcontents = 0;
 472                                         trace_dphitq3surfaceflags = 0;
 473                                         trace_dphittexturename = string_null;
 474                                         touched2(this, ent);
 475                                 }
 476                         }
 477                 }
 478                 // end SV_PushEntity
 479                 if (wasfreed(this)) { return; }
 480                 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
 481                 if (trace_fraction == 1) { break; }
 482                 movetime *= 1 - min(1, trace_fraction);
 483                 ClipVelocity(vel, trace_plane_normal, vel, 1);
 484         }
 485
 486         this.com_phys_acc = acc;
 487         this.com_phys_vel = vel;
 488         this.com_phys_pos = pos;
 489         setorigin(this, this.com_phys_pos);
 490 }
 491
 492 void sys_phys_update_single(entity this)
 493 {
 494         sys_phys_simulate_simple(this, frametime);
 495 }