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                 this.jumppadcount = 0;
 112         } else if (time < this.ladder_time) {
 113                 this.com_phys_friction = PHYS_FRICTION(this);
 114                 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
 115                 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
 116                 this.com_phys_gravity = '0 0 -1' * PHYS_GRAVITY(this) * dt;
 117                 if (PHYS_ENTGRAVITY(this)) { this.com_phys_gravity *= PHYS_ENTGRAVITY(this); }
 118                 this.com_phys_ladder = true;
 119                 this.com_phys_friction_air = true;
 120                 sys_phys_simulate(this, dt);
 121                 this.com_phys_friction_air = false;
 122                 this.com_phys_ladder = false;
 123                 this.com_phys_gravity = '0 0 0';
 124         } else if (ITEMS_STAT(this) & IT_USING_JETPACK) {
 125                 PM_jetpack(this, maxspeed_mod, dt);
 126         } else if (IS_ONGROUND(this)) {
 127                 if (!WAS_ONGROUND(this)) {
 128                         emit(phys_land, this);
 129                         if (this.lastground < time - 0.3) {
 130                                 this.velocity *= (1 - PHYS_FRICTION_ONLAND(this));
 131                         }
 132                 }
 133                 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
 134                 this.com_phys_gravity = '0 0 -1' * PHYS_GRAVITY(this) * dt;
 135                 if (PHYS_ENTGRAVITY(this)) { this.com_phys_gravity *= PHYS_ENTGRAVITY(this); }
 136                 this.com_phys_ground = true;
 137                 this.com_phys_vel_2d = true;
 138                 sys_phys_simulate(this, dt);
 139                 this.com_phys_vel_2d = false;
 140                 this.com_phys_ground = false;
 141                 this.com_phys_gravity = '0 0 0';
 142         } else {
 143                 this.com_phys_acc_rate_air = PHYS_AIRACCELERATE(this) * min(maxspeed_mod, 1);
 144                 this.com_phys_acc_rate_air_stop = PHYS_AIRSTOPACCELERATE(this) * maxspeed_mod;
 145                 this.com_phys_acc_rate_air_strafe = PHYS_AIRSTRAFEACCELERATE(this) * maxspeed_mod;
 146                 this.com_phys_vel_max_air_strafe = PHYS_MAXAIRSTRAFESPEED(this) * maxspeed_mod;
 147                 this.com_phys_vel_max_air = PHYS_MAXAIRSPEED(this) * maxspeed_mod;
 148                 this.com_phys_vel_max = PHYS_MAXAIRSPEED(this) * min(maxspeed_mod, 1);
 149                 this.com_phys_air = true;
 150                 this.com_phys_vel_2d = true;
 151                 sys_phys_simulate(this, dt);
 152                 this.com_phys_vel_2d = false;
 153                 this.com_phys_air = false;
 154         }
 155
 156         LABEL(end)
 157         if (IS_ONGROUND(this)) { this.lastground = time; }
 158 // conveyors: then break velocity again
 159         if (this.conveyor.state) { this.velocity += this.conveyor.movedir; }
 160         this.lastflags = this.flags;
 161
 162         this.lastclassname = this.classname;
 163 }
 164
 165 /** for players */
 166 void sys_phys_simulate(entity this, float dt)
 167 {
 168         if (!this.com_phys_ground && !this.com_phys_air) {
 169                 // noclipping
 170                 // flying
 171                 // on a spawnfunc_func_ladder
 172                 // swimming in spawnfunc_func_water
 173                 // swimming
 174                 UNSET_ONGROUND(this);
 175
 176                 if (this.com_phys_friction_air) {
 177                         const vector g = -this.com_phys_gravity;
 178                         this.velocity_z += g.z / 2;
 179                         this.velocity = this.velocity * (1 - dt * this.com_phys_friction);
 180                         this.velocity_z += g.z / 2;
 181                 }
 182         }
 183
 184         if (this.com_phys_water) {
 185                 // water jump only in certain situations
 186                 // this mimics quakeworld code
 187                 if (this.com_in_jump && this.waterlevel == WATERLEVEL_SWIMMING && this.velocity_z >= -180 && !this.viewloc) {
 188                         vector yawangles = '0 1 0' * this.v_angle.y;
 189                         makevectors(yawangles);
 190                         vector forward = v_forward;
 191                         vector spot = this.origin + 24 * forward;
 192                         spot_z += 8;
 193                         traceline(spot, spot, MOVE_NOMONSTERS, this);
 194                         if (trace_startsolid) {
 195                                 spot_z += 24;
 196                                 traceline(spot, spot, MOVE_NOMONSTERS, this);
 197                                 if (!trace_startsolid) {
 198                                         this.velocity = forward * 50;
 199                                         this.velocity_z = 310;
 200                                         UNSET_ONGROUND(this);
 201                                         SET_JUMP_HELD(this);
 202                                 }
 203                         }
 204                 }
 205         }
 206         makevectors(vmul(this.v_angle, (this.com_phys_vel_2d ? '0 1 0' : '1 1 1')));
 207         // wishvel = v_forward * PHYS_CS(this).movement.x + v_right * PHYS_CS(this).movement.y + v_up * PHYS_CS(this).movement.z;
 208         vector wishvel = v_forward * PHYS_CS(this).movement.x
 209             + v_right * PHYS_CS(this).movement.y
 210             + '0 0 1' * PHYS_CS(this).movement.z * (this.com_phys_vel_2d ? 0 : 1);
 211         if (this.com_phys_water) {
 212                 if (PHYS_INPUT_BUTTON_CROUCH(this)) {
 213                         wishvel.z = -PHYS_MAXSPEED(this);
 214                 }
 215                 if (this.viewloc) {
 216                         wishvel.z = -160;    // drift anyway
 217                 } else if (wishvel == '0 0 0') {
 218                         wishvel = '0 0 -60'; // drift towards bottom
 219                 }
 220         }
 221         if (this.com_phys_ladder) {
 222                 if (this.viewloc) {
 223                         wishvel.z = PHYS_CS(this).movement_old.x;
 224                 }
 225                 if (this.ladder_entity.classname == "func_water") {
 226                         float f = vlen(wishvel);
 227                         if (f > this.ladder_entity.speed) {
 228                                 wishvel *= (this.ladder_entity.speed / f);
 229                         }
 230
 231                         this.watertype = this.ladder_entity.skin;
 232                         f = this.ladder_entity.origin_z + this.ladder_entity.maxs_z;
 233                         if ((this.origin_z + this.view_ofs_z) < f) {
 234                                 this.waterlevel = WATERLEVEL_SUBMERGED;
 235                         } else if ((this.origin_z + (this.mins_z + this.maxs_z) * 0.5) < f) {
 236                                 this.waterlevel = WATERLEVEL_SWIMMING;
 237                         } else if ((this.origin_z + this.mins_z + 1) < f) {
 238                                 this.waterlevel = WATERLEVEL_WETFEET;
 239                         } else {
 240                                 this.waterlevel = WATERLEVEL_NONE;
 241                                 this.watertype = CONTENT_EMPTY;
 242                         }
 243                 }
 244         }
 245         // acceleration
 246         const vector wishdir = normalize(wishvel);
 247         float wishspeed = min(vlen(wishvel), this.com_phys_vel_max);
 248
 249         if (this.com_phys_air) {
 250                 if ((IS_SVQC && time >= PHYS_TELEPORT_TIME(this))
 251                     ||  (IS_CSQC && PHYS_WATERJUMP_TIME(this) <= 0)) {
 252                         // apply air speed limit
 253                         float airaccelqw = PHYS_AIRACCEL_QW(this);
 254                         float wishspeed0 = wishspeed;
 255                         const float maxairspd = this.com_phys_vel_max;
 256                         wishspeed = min(wishspeed, maxairspd);
 257                         if (IS_DUCKED(this)) {
 258                                 wishspeed *= 0.5;
 259                         }
 260                         float airaccel = this.com_phys_acc_rate_air;
 261
 262                         float accelerating = (this.velocity * wishdir > 0);
 263                         float wishspeed2 = wishspeed;
 264
 265                         // CPM: air control
 266                         if (PHYS_AIRSTOPACCELERATE(this)) {
 267                                 vector curdir = normalize(vec2(this.velocity));
 268                                 airaccel += (this.com_phys_acc_rate_air_stop - airaccel) * max(0, -(curdir * wishdir));
 269                         }
 270                         // note that for straight forward jumping:
 271                         // step = accel * dt * wishspeed0;
 272                         // accel  = bound(0, wishspeed - vel_xy_current, step) * accelqw + step * (1 - accelqw);
 273                         // -->
 274                         // dv/dt = accel * maxspeed (when slow)
 275                         // dv/dt = accel * maxspeed * (1 - accelqw) (when fast)
 276                         // log dv/dt = logaccel + logmaxspeed (when slow)
 277                         // log dv/dt = logaccel + logmaxspeed + log(1 - accelqw) (when fast)
 278                         float strafity = IsMoveInDirection(PHYS_CS(this).movement, -90) + IsMoveInDirection(PHYS_CS(this).movement, +90);  // if one is nonzero, other is always zero
 279                         if (PHYS_MAXAIRSTRAFESPEED(this)) {
 280                                 wishspeed =
 281                                     min(wishspeed,
 282                                         GeomLerp(this.com_phys_vel_max_air, strafity, this.com_phys_vel_max_air_strafe));
 283                         }
 284                         if (PHYS_AIRSTRAFEACCELERATE(this)) {
 285                                 airaccel = GeomLerp(airaccel, strafity, this.com_phys_acc_rate_air_strafe);
 286                         }
 287                         if (PHYS_AIRSTRAFEACCEL_QW(this)) {
 288                                 airaccelqw =
 289                                     (((strafity > 0.5 ? PHYS_AIRSTRAFEACCEL_QW(this) : PHYS_AIRACCEL_QW(this)) >= 0) ? +1 : -1)
 290                                     *
 291                                     (1 - GeomLerp(1 - fabs(PHYS_AIRACCEL_QW(this)), strafity, 1 - fabs(PHYS_AIRSTRAFEACCEL_QW(this))));
 292                         }
 293                         // !CPM
 294
 295                         if (PHYS_WARSOWBUNNY_TURNACCEL(this) && accelerating && PHYS_CS(this).movement.y == 0 && PHYS_CS(this).movement.x != 0) {
 296                                 PM_AirAccelerate(this, dt, wishdir, wishspeed2);
 297                         } else {
 298                                 float sidefric = maxairspd ? (PHYS_AIRACCEL_SIDEWAYS_FRICTION(this) / maxairspd) : 0;
 299                                 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed0, airaccel, airaccelqw,
 300                                         PHYS_AIRACCEL_QW_STRETCHFACTOR(this), sidefric, PHYS_AIRSPEEDLIMIT_NONQW(this));
 301                         }
 302
 303                         if (PHYS_AIRCONTROL(this)) {
 304                                 CPM_PM_Aircontrol(this, dt, wishdir, wishspeed2);
 305                         }
 306                 }
 307         } else {
 308                 if (this.com_phys_ground && IS_DUCKED(this)) { wishspeed *= 0.5; }
 309                 if (this.com_phys_water) {
 310                         wishspeed *= 0.7;
 311
 312                         //      if (PHYS_WATERJUMP_TIME(this) <= 0) // TODO: use
 313                         {
 314                                 // water friction
 315                                 float f = 1 - dt * PHYS_FRICTION(this);
 316                                 f = min(max(0, f), 1);
 317                                 this.velocity *= f;
 318
 319                                 f = wishspeed - this.velocity * wishdir;
 320                                 if (f > 0) {
 321                                         float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, f);
 322                                         this.velocity += accelspeed * wishdir;
 323                                 }
 324
 325                                 // holding jump button swims upward slowly
 326                                 if (this.com_in_jump && !this.viewloc) {
 327                                         // was:
 328                                         // lava: 50
 329                                         // slime: 80
 330                                         // water: 100
 331                                         // idea: double those
 332                                         this.velocity_z = 200;
 333                                         if (this.waterlevel >= WATERLEVEL_SUBMERGED) {
 334                                                 this.velocity_z = PHYS_MAXSPEED(this) * 0.7;
 335                                         }
 336                                 }
 337                         }
 338                         if (this.viewloc) {
 339                                 const float addspeed = wishspeed - this.velocity * wishdir;
 340                                 if (addspeed > 0) {
 341                                         const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
 342                                         this.velocity += accelspeed * wishdir;
 343                                 }
 344                         } else {
 345                                 // water acceleration
 346                                 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
 347                         }
 348                         return;
 349                 }
 350                 if (this.com_phys_ground) {
 351                         // apply edge friction
 352                         const float f2 = vlen2(vec2(this.velocity));
 353                         if (f2 > 0) {
 354                                 trace_dphitq3surfaceflags = 0;
 355                                 tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
 356                                 // TODO: apply edge friction
 357                                 // apply ground friction
 358                                 const int realfriction = (trace_dphitq3surfaceflags & Q3SURFACEFLAG_SLICK)
 359                                     ? PHYS_FRICTION_SLICK(this)
 360                                         : PHYS_FRICTION(this);
 361
 362                                 float f = sqrt(f2);
 363                                 f = 1 - dt * realfriction
 364                                     * ((f < PHYS_STOPSPEED(this)) ? (PHYS_STOPSPEED(this) / f) : 1);
 365                                 f = max(0, f);
 366                                 this.velocity *= f;
 367                                 /*
 368                                    Mathematical analysis time!
 369
 370                                    Our goal is to invert this mess.
 371
 372                                    For the two cases we get:
 373                                     v = v0 * (1 - dt * (PHYS_STOPSPEED(this) / v0) * PHYS_FRICTION(this))
 374                                       = v0 - dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
 375                                     v0 = v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
 376                                    and
 377                                     v = v0 * (1 - dt * PHYS_FRICTION(this))
 378                                     v0 = v / (1 - dt * PHYS_FRICTION(this))
 379
 380                                    These cases would be chosen ONLY if:
 381                                     v0 < PHYS_STOPSPEED(this)
 382                                     v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this) < PHYS_STOPSPEED(this)
 383                                     v < PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
 384                                    and, respectively:
 385                                     v0 >= PHYS_STOPSPEED(this)
 386                                     v / (1 - dt * PHYS_FRICTION(this)) >= PHYS_STOPSPEED(this)
 387                                     v >= PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
 388                                  */
 389                         }
 390                         const float addspeed = wishspeed - this.velocity * wishdir;
 391                         if (addspeed > 0) {
 392                                 const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
 393                                 this.velocity += accelspeed * wishdir;
 394                         }
 395                         return;
 396                 }
 397
 398                 if (IS_CSQC ? PHYS_WATERJUMP_TIME(this) <= 0 : time >= PHYS_TELEPORT_TIME(this)) {
 399                         PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
 400                 }
 401         }
 402 }
 403
 404 .entity groundentity;
 405 /** for other entities */
 406 void sys_phys_simulate_simple(entity this, float dt)
 407 {
 408         vector mn = this.mins;
 409         vector mx = this.maxs;
 410
 411         vector g = '0 0 0';
 412         if (this.com_phys_gravity_factor && !g) g = '0 0 -1' * PHYS_GRAVITY(NULL);
 413
 414         vector acc = this.com_phys_acc;
 415         vector vel = this.com_phys_vel;
 416         vector pos = this.com_phys_pos;
 417
 418         // SV_Physics_Toss
 419
 420         vel += g * dt;
 421
 422         this.angles += dt * this.avelocity;
 423         float movetime = dt;
 424         for (int i = 0; i < MAX_CLIP_PLANES && movetime > 0; i++) {
 425                 vector push = vel * movetime;
 426                 vector p0 = pos;
 427                 vector p1 = p0 + push;
 428                 // SV_PushEntity
 429                 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
 430                 if (!trace_startsolid) {
 431                         bool hit = trace_fraction < 1;
 432                         pos = trace_endpos;
 433                         entity ent = trace_ent;
 434                         // SV_LinkEdict_TouchAreaGrid
 435                         if (this.solid != SOLID_NOT) {
 436                                 FOREACH_ENTITY_RADIUS_ORDERED(0.5 * (this.absmin + this.absmax), 0.5 * vlen(this.absmax - this.absmin), true, {
 437                                         if (it.solid != SOLID_TRIGGER || it == this) continue;
 438                                         if (gettouch(it) && boxesoverlap(it.absmin, it.absmax, this.absmin, this.absmax)) {
 439                                             // SV_LinkEdict_TouchAreaGrid_Call
 440                                             trace_allsolid = false;
 441                                             trace_startsolid = false;
 442                                             trace_fraction = 1;
 443                                             trace_inwater = false;
 444                                             trace_inopen = true;
 445                                             trace_endpos = it.origin;
 446                                             trace_plane_normal = '0 0 1';
 447                                             trace_plane_dist = 0;
 448                                             trace_ent = this;
 449                                             trace_dpstartcontents = 0;
 450                                             trace_dphitcontents = 0;
 451                                             trace_dphitq3surfaceflags = 0;
 452                                             trace_dphittexturename = string_null;
 453                                             gettouch(it)(this, it);
 454                                             vel = this.velocity;
 455                                         }
 456                                 });
 457                         }
 458                         if (hit && this.solid >= SOLID_TRIGGER && (!IS_ONGROUND(this) || this.groundentity != ent)) {
 459                                 // SV_Impact (ent, trace);
 460                                 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
 461                                 void(entity, entity) touched = gettouch(this);
 462                                 if (touched && this.solid != SOLID_NOT) {
 463                                         touched(ent, this);
 464                                 }
 465                                 void(entity, entity) touched2 = gettouch(ent);
 466                                 if (this && ent && touched2 && ent.solid != SOLID_NOT) {
 467                                         trace_endpos = ent.origin;
 468                                         trace_plane_normal *= -1;
 469                                         trace_plane_dist *= -1;
 470                                         trace_ent = this;
 471                                         trace_dpstartcontents = 0;
 472                                         trace_dphitcontents = 0;
 473                                         trace_dphitq3surfaceflags = 0;
 474                                         trace_dphittexturename = string_null;
 475                                         touched2(this, ent);
 476                                 }
 477                         }
 478                 }
 479                 // end SV_PushEntity
 480                 if (wasfreed(this)) { return; }
 481                 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
 482                 if (trace_fraction == 1) { break; }
 483                 movetime *= 1 - min(1, trace_fraction);
 484                 ClipVelocity(vel, trace_plane_normal, vel, 1);
 485         }
 486
 487         this.com_phys_acc = acc;
 488         this.com_phys_vel = vel;
 489         this.com_phys_pos = pos;
 490         setorigin(this, this.com_phys_pos);
 491 }
 492
 493 void sys_phys_update_single(entity this)
 494 {
 495         sys_phys_simulate_simple(this, frametime);
 496 }