src/Environment/fgclouds.cxx

   1 // Build a cloud layer based on metar
   2 //
   3 // Written by Harald JOHNSEN, started April 2005.
   4 //
   5 // Copyright (C) 2005  Harald JOHNSEN - hjohnsen@evc.net
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20 //
  21 //
  22
  23 #ifdef HAVE_CONFIG_H
  24 #  include "config.h"
  25 #endif
  26
  27 #include <Main/fg_props.hxx>
  28
  29 #include <simgear/constants.h>
  30 #include <simgear/sound/soundmgr_openal.hxx>
  31 #include <simgear/scene/sky/sky.hxx>
  32 #include <simgear/environment/visual_enviro.hxx>
  33 #include <simgear/scene/sky/cloudfield.hxx>
  34 #include <simgear/scene/sky/newcloud.hxx>
  35 #include <simgear/math/sg_random.h>
  36 #include <simgear/props/props_io.hxx>
  37
  38 #include <Main/globals.hxx>
  39 #include <Airports/simple.hxx>
  40 #include <Main/util.hxx>
  41
  42 #include "environment_ctrl.hxx"
  43 #include "environment_mgr.hxx"
  44 #include "fgmetar.hxx"
  45 #include "fgclouds.hxx"
  46
  47 extern SGSky *thesky;
  48
  49
  50 FGClouds::FGClouds(FGEnvironmentCtrl * controller) :
  51         station_elevation_ft(0.0),
  52         _controller( controller ),
  53         snd_lightning(NULL),
  54     last_scenario( "unset" ),
  55     last_env_config( new SGPropertyNode() ),
  56     last_env_clouds( new SGPropertyNode() )
  57 {
  58         update_event = 0;
  59 }
  60 FGClouds::~FGClouds() {
  61 }
  62
  63 int FGClouds::get_update_event(void) const {
  64         return update_event;
  65 }
  66 void FGClouds::set_update_event(int count) {
  67         update_event = count;
  68         build();
  69 }
  70
  71 void FGClouds::init(void) {
  72         if( snd_lightning == NULL ) {
  73                 snd_lightning = new SGSoundSample(globals->get_fg_root().c_str(), "Sounds/thunder.wav");
  74                 snd_lightning->set_max_dist(7000.0f);
  75                 snd_lightning->set_reference_dist(3000.0f);
  76                 SGSoundMgr *soundMgr = globals->get_soundmgr();
  77                 soundMgr->add( snd_lightning, "thunder" );
  78                 sgEnviro.set_soundMgr( soundMgr );
  79         }
  80 }
  81
  82 void FGClouds::buildCloud(SGPropertyNode *cloud_def_root, SGPropertyNode  *box_def_root, const string& name, sgVec3 pos, SGCloudField *layer) {
  83         SGPropertyNode *box_def=NULL;
  84         SGPropertyNode *cld_def=NULL;
  85
  86         SGPath texture_root = globals->get_fg_root();
  87         texture_root.append("Textures");
  88         texture_root.append("Sky");
  89
  90         box_def = box_def_root->getChild(name.c_str());
  91
  92         string base_name = name.substr(0,2);
  93         if( !box_def ) {
  94                 if( name[2] == '-' ) {
  95                         box_def = box_def_root->getChild(base_name.c_str());
  96                 }
  97                 if( !box_def )
  98                         return;
  99         }
 100
 101         for(int i = 0; i < box_def->nChildren() ; i++) {
 102                 SGPropertyNode *abox = box_def->getChild(i);
 103                 if( strcmp(abox->getName(), "box") == 0) {
 104                         double x = abox->getDoubleValue("x") + pos[0];
 105                         double y = abox->getDoubleValue("y") + pos[1];
 106                         double z = abox->getDoubleValue("z") + pos[2];
 107                         SGVec3f newpos = SGVec3f(x, z, y);
 108
 109                         string type = abox->getStringValue("type", "cu-small");
 110
 111                         cld_def = cloud_def_root->getChild(type.c_str());
 112                         if ( !cld_def ) return;
 113
 114                         double min_width = cld_def->getDoubleValue("min-cloud-width-m", 500.0);
 115                         double max_width = cld_def->getDoubleValue("max-cloud-width-m", 1000.0);
 116                         double min_height = cld_def->getDoubleValue("min-cloud-height-m", min_width);
 117                         double max_height = cld_def->getDoubleValue("max-cloud-height-m", max_width);
 118                         double min_sprite_width = cld_def->getDoubleValue("min-sprite-width-m", 200.0);
 119                         double max_sprite_width = cld_def->getDoubleValue("max-sprite-width-m", min_sprite_width);
 120                         double min_sprite_height = cld_def->getDoubleValue("min-sprite-height-m", min_sprite_width);
 121                         double max_sprite_height = cld_def->getDoubleValue("max-sprite-height-m", max_sprite_width);
 122                         int num_sprites = cld_def->getIntValue("num-sprites", 20);
 123                         int num_textures_x = cld_def->getIntValue("num-textures-x", 1);
 124                         int num_textures_y = cld_def->getIntValue("num-textures-y", 1);
 125                         double bottom_shade = cld_def->getDoubleValue("bottom-shade", 1.0);
 126                         string texture = cld_def->getStringValue("texture", "cl_cumulus.rgb");
 127
 128                         SGNewCloud *cld =
 129                                 new SGNewCloud(type,
 130                                                texture_root,
 131                                                texture,
 132                                                min_width,
 133                                                max_width,
 134                                                min_height,
 135                                                max_height,
 136                                                min_sprite_width,
 137                                                max_sprite_width,
 138                                                min_sprite_height,
 139                                                max_sprite_height,
 140                                                bottom_shade,
 141                                                num_sprites,
 142                                                num_textures_x,
 143                                                num_textures_y);
 144                         layer->addCloud(newpos, cld);
 145                 }
 146         }
 147 }
 148
 149 void FGClouds::buildLayer(int iLayer, const string& name, double alt, double coverage) {
 150         struct {
 151                 string name;
 152                 double count;
 153         } tCloudVariety[20];
 154         int CloudVarietyCount = 0;
 155         double totalCount = 0.0;
 156
 157         SGPropertyNode *cloud_def_root = fgGetNode("/environment/cloudlayers/clouds", false);
 158         SGPropertyNode *box_def_root   = fgGetNode("/environment/cloudlayers/boxes", false);
 159         SGPropertyNode *layer_def_root = fgGetNode("/environment/cloudlayers/layers", false);
 160         SGCloudField *layer = thesky->get_cloud_layer(iLayer)->get_layer3D();
 161         layer->clear();
 162
 163         // when we don't generate clouds the layer is rendered in 2D
 164         if ((! clouds_3d_enabled) || coverage == 0.0 ||
 165             layer_def_root == NULL || cloud_def_root == NULL || box_def_root == NULL)
 166         {
 167                 thesky->get_cloud_layer(iLayer)->set_enable3dClouds(false);
 168                 return;
 169         }
 170
 171         SGPropertyNode *layer_def=NULL;
 172
 173         layer_def = layer_def_root->getChild(name.c_str());
 174         if( !layer_def ) {
 175                 if( name[2] == '-' ) {
 176                         string base_name = name.substr(0,2);
 177                         layer_def = layer_def_root->getChild(base_name.c_str());
 178                 }
 179                 if( !layer_def )
 180                 {
 181                         thesky->get_cloud_layer(iLayer)->set_enable3dClouds(false);
 182                         return;
 183                 }
 184         }
 185
 186         double grid_x_size = layer_def->getDoubleValue("grid-x-size", 1000.0);
 187         double grid_y_size = layer_def->getDoubleValue("grid-y-size", 1000.0);
 188         double grid_x_rand = layer_def->getDoubleValue("grid-x-rand", grid_x_size);
 189         double grid_y_rand = layer_def->getDoubleValue("grid-y-rand", grid_y_size);
 190         double grid_z_rand = layer_def->getDoubleValue("grid-z-rand");
 191
 192         for(int i = 0; i < layer_def->nChildren() ; i++) {
 193                 SGPropertyNode *acloud = layer_def->getChild(i);
 194                 if( strcmp(acloud->getName(), "cloud") == 0) {
 195                         string cloud_name = acloud->getStringValue("name");
 196                         tCloudVariety[CloudVarietyCount].name = cloud_name;
 197                         double count = acloud->getDoubleValue("count", 1.0);
 198                         tCloudVariety[CloudVarietyCount].count = count;
 199                         int variety = 0;
 200                         cloud_name = cloud_name + "-%d";
 201                         char variety_name[50];
 202                         do {
 203                                 variety++;
 204                                 snprintf(variety_name, sizeof(variety_name), cloud_name.c_str(), variety);
 205                         } while( box_def_root->getChild(variety_name, 0, false) );
 206
 207                         totalCount += count;
 208                         if( CloudVarietyCount < 20 )
 209                                 CloudVarietyCount++;
 210                 }
 211         }
 212         totalCount = 1.0 / totalCount;
 213
 214         for(double px = 0.0; px < SGCloudField::fieldSize; px += grid_x_size) {
 215                 for(double py = 0.0; py < SGCloudField::fieldSize; py += grid_y_size) {
 216                         double x = px + grid_x_rand * (sg_random() - 0.5) - (SGCloudField::fieldSize / 2.0);
 217                         double y = py + grid_y_rand * (sg_random() - 0.5) - (SGCloudField::fieldSize / 2.0);
 218                         double z = grid_z_rand * (sg_random() - 0.5);
 219
 220                         if (sg_random() < coverage)
 221                         {
 222                             double choice = sg_random();
 223
 224                             for(int i = 0; i < CloudVarietyCount ; i ++) {
 225                                     choice -= tCloudVariety[i].count * totalCount;
 226                                     if( choice <= 0.0 ) {
 227                                             sgVec3 pos={x,z,y};
 228
 229                                             buildCloud(cloud_def_root,
 230                                                        box_def_root,
 231                                                        tCloudVariety[i].name,
 232                                                        pos,
 233                                                        layer);
 234                                             break;
 235                                     }
 236                             }
 237                         }
 238                 }
 239         }
 240
 241         // Now we've built any clouds, enable them and set the density (coverage)
 242         //layer->setCoverage(coverage);
 243         //layer->applyCoverage();
 244         thesky->get_cloud_layer(iLayer)->set_enable3dClouds(clouds_3d_enabled);
 245 }
 246
 247 // TODO:call this after real metar updates
 248 void FGClouds::buildCloudLayers(void) {
 249         SGPropertyNode *metar_root = fgGetNode("/environment", true);
 250
 251         double wind_speed_kt     = metar_root->getDoubleValue("wind-speed-kt");
 252         double temperature_degc  = metar_root->getDoubleValue("temperature-sea-level-degc");
 253         double dewpoint_degc     = metar_root->getDoubleValue("dewpoint-sea-level-degc");
 254         double pressure_mb              = metar_root->getDoubleValue("pressure-sea-level-inhg") * SG_INHG_TO_PA / 100.0;
 255
 256         double dewp = pow(10.0, 7.5 * dewpoint_degc / (237.7 + dewpoint_degc));
 257         double temp = pow(10.0, 7.5 * temperature_degc / (237.7 + temperature_degc));
 258         double rel_humidity = dewp * 100 / temp;
 259
 260         // formule d'Epsy, base d'un cumulus
 261         double cumulus_base = 122.0 * (temperature_degc - dewpoint_degc);
 262         double stratus_base = 100.0 * (100.0 - rel_humidity) * SG_FEET_TO_METER;
 263
 264         bool cu_seen = false;
 265
 266         for(int iLayer = 0 ; iLayer < thesky->get_cloud_layer_count(); iLayer++) {
 267                 SGPropertyNode *cloud_root = fgGetNode("/environment/clouds/layer", iLayer, true);
 268
 269                 double alt_ft = cloud_root->getDoubleValue("elevation-ft");
 270                 double alt_m = alt_ft * SG_FEET_TO_METER;
 271                 string coverage = cloud_root->getStringValue("coverage");
 272
 273
 274                 double coverage_norm = 0.0;
 275                 if( coverage == "few" )
 276                         coverage_norm = 2.0/8.0;        // <1-2
 277                 else if( coverage == "scattered" )
 278                         coverage_norm = 4.0/8.0;        // 3-4
 279                 else if( coverage == "broken" )
 280                         coverage_norm = 6.0/8.0;        // 5-7
 281                 else if( coverage == "overcast" )
 282                         coverage_norm = 8.0/8.0;        // 8
 283
 284                 string layer_type = "nn";
 285                 if( coverage == "cirrus" ) {
 286                         layer_type = "ci";
 287                 } else if( alt_ft > 16500 ) {
 288 //                      layer_type = "ci|cs|cc";
 289                         layer_type = "ci";
 290                 } else if( alt_ft > 6500 ) {
 291 //                      layer_type = "as|ac|ns";
 292                         layer_type = "ac";
 293                         if( pressure_mb < 1005.0 && coverage_norm >= 0.5 )
 294                                 layer_type = "ns";
 295                 } else {
 296 //                      layer_type = "st|cu|cb|sc";
 297                         if( cumulus_base * 0.80 < alt_m && cumulus_base * 1.20 > alt_m ) {
 298                                 // +/- 20% from cumulus probable base
 299                                 layer_type = "cu";
 300                         } else if( stratus_base * 0.80 < alt_m && stratus_base * 1.40 > alt_m ) {
 301                                 // +/- 20% from stratus probable base
 302                                 layer_type = "st";
 303                         } else {
 304                                 // above formulae is far from perfect
 305                                 if ( alt_ft < 2000 )
 306                                         layer_type = "st";
 307                                 else if( alt_ft < 4500 )
 308                                         layer_type = "cu";
 309                                 else
 310                                         layer_type = "sc";
 311                         }
 312                 }
 313
 314                 buildLayer(iLayer, layer_type, alt_m, coverage_norm);
 315         }
 316 }
 317
 318 // copy from FGMetarEnvironmentCtrl until better
 319 void
 320 FGClouds::update_metar_properties( const FGMetar *m )
 321 {
 322     int i;
 323     int j;
 324     double d;
 325     char s[128];
 326
 327     fgSetString("/environment/metar/station-id", m->getId());
 328     fgSetDouble("/environment/metar/min-visibility-m",
 329                 m->getMinVisibility().getVisibility_m() );
 330     fgSetDouble("/environment/metar/max-visibility-m",
 331                 m->getMaxVisibility().getVisibility_m() );
 332
 333     const SGMetarVisibility *dirvis = m->getDirVisibility();
 334     for (i = 0; i < 8; i++, dirvis++) {
 335         const char *min = "/environment/metar/visibility[%d]/min-m";
 336         const char *max = "/environment/metar/visibility[%d]/max-m";
 337
 338         d = dirvis->getVisibility_m();
 339
 340         snprintf(s, 128, min, i);
 341         fgSetDouble(s, d);
 342         snprintf(s, 128, max, i);
 343         fgSetDouble(s, d);
 344     }
 345
 346     fgSetInt("/environment/metar/base-wind-range-from",
 347              m->getWindRangeFrom() );
 348     fgSetInt("/environment/metar/base-wind-range-to",
 349              m->getWindRangeTo() );
 350     fgSetDouble("/environment/metar/base-wind-speed-kt",
 351                 m->getWindSpeed_kt() );
 352     fgSetDouble("/environment/metar/gust-wind-speed-kt",
 353                 m->getGustSpeed_kt() );
 354     fgSetDouble("/environment/metar/temperature-degc",
 355                 m->getTemperature_C() );
 356     fgSetDouble("/environment/metar/dewpoint-degc",
 357                 m->getDewpoint_C() );
 358     fgSetDouble("/environment/metar/rel-humidity-norm",
 359                 m->getRelHumidity() );
 360     fgSetDouble("/environment/metar/pressure-inhg",
 361                 m->getPressure_inHg() );
 362
 363     vector<SGMetarCloud> cv = m->getClouds();
 364     vector<SGMetarCloud>::const_iterator cloud;
 365
 366     // Load into both the METAR and environment properties to stop interpolation
 367     const char *cl[] = {"/environment/metar/clouds/layer[%i]",
 368                         "/environment/clouds/layer[%i]"};
 369
 370     for (j = 0; j < 2; j++)
 371     {
 372         for (i = 0, cloud = cv.begin(); cloud != cv.end(); cloud++, i++) {
 373             const char *coverage_string[5] =
 374                 { "clear", "few", "scattered", "broken", "overcast" };
 375             const double thickness[5] = { 0, 65, 600,750, 1000};
 376             int q;
 377
 378             snprintf(s, 128, cl[j], i);
 379             strncat(s, "/coverage", 128);
 380             q = cloud->getCoverage();
 381             fgSetString(s, coverage_string[q] );
 382
 383             snprintf(s, 128, cl[j], i);
 384             strncat(s, "/elevation-ft", 128);
 385             fgSetDouble(s, cloud->getAltitude_ft() + station_elevation_ft);
 386
 387             snprintf(s, 128, cl[j], i);
 388             strncat(s, "/thickness-ft", 128);
 389             fgSetDouble(s, thickness[q]);
 390
 391             snprintf(s, 128, cl[j], i);
 392             strncat(s, "/span-m", 128);
 393             fgSetDouble(s, 40000.0);
 394         }
 395
 396         for (; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
 397
 398
 399             snprintf(s, 128, cl[j], i);
 400             strncat(s, "/coverage", 128);
 401             fgSetString(s, "clear");
 402
 403             snprintf(s, 128, cl[j], i);
 404             strncat(s, "/elevation-ft", 128);
 405             fgSetDouble(s, -9999);
 406
 407             snprintf(s, 128, cl[j], i);
 408             strncat(s, "/thickness-ft", 128);
 409             fgSetDouble(s, 0);
 410
 411             snprintf(s, 128, cl[j], i);
 412             strncat(s, "/span-m", 128);
 413             fgSetDouble(s, 40000.0);
 414         }
 415     }
 416
 417     fgSetDouble("/environment/metar/rain-norm", m->getRain());
 418     fgSetDouble("/environment/metar/hail-norm", m->getHail());
 419     fgSetDouble("/environment/metar/snow-norm", m->getSnow());
 420     fgSetBool("/environment/metar/snow-cover", m->getSnowCover());
 421 }
 422
 423 void
 424 FGClouds::update_env_config ()
 425 {
 426     fgSetupWind( fgGetDouble("/environment/metar/base-wind-range-from"),
 427                  fgGetDouble("/environment/metar/base-wind-range-to"),
 428                  fgGetDouble("/environment/metar/base-wind-speed-kt"),
 429                  fgGetDouble("/environment/metar/gust-wind-speed-kt") );
 430
 431     fgDefaultWeatherValue( "visibility-m",
 432                            fgGetDouble("/environment/metar/min-visibility-m") );
 433 #if 0
 434     set_temp_at_altitude( fgGetDouble("/environment/metar/temperature-degc"),
 435                           station_elevation_ft );
 436     set_dewpoint_at_altitude( fgGetDouble("/environment/metar/dewpoint-degc"),
 437                               station_elevation_ft );
 438 #endif
 439     fgDefaultWeatherValue( "pressure-sea-level-inhg",
 440                            fgGetDouble("/environment/metar/pressure-inhg") );
 441 }
 442
 443
 444 void FGClouds::setLayer( int iLayer, float alt_ft, const string& coverage, const string& layer_type ) {
 445         double coverage_norm = 0.0;
 446         if( coverage == "few" )
 447                 coverage_norm = 2.0/8.0;        // <1-2
 448         else if( coverage == "scattered" )
 449                 coverage_norm = 4.0/8.0;        // 3-4
 450         else if( coverage == "broken" )
 451                 coverage_norm = 6.0/8.0;        // 5-7
 452         else if( coverage == "overcast" )
 453                 coverage_norm = 8.0/8.0;        // 8
 454
 455         buildLayer(iLayer, layer_type, station_elevation_ft + alt_ft * SG_FEET_TO_METER, coverage_norm);
 456 }
 457
 458 void FGClouds::buildScenario( const string& scenario ) {
 459         string fakeMetar="";
 460         string station = fgGetString("/environment/metar/station-id", "XXXX");
 461
 462         // fetch station elevation if exists
 463         if( station == "XXXX" )
 464             station_elevation_ft = fgGetDouble("/position/ground-elev-m", 0.0);
 465         else {
 466             const FGAirport* a = globals->get_airports()->search( station );
 467             station_elevation_ft = (a ? a->getElevation() : 0.0);
 468         }
 469
 470         for(int iLayer = 0 ; iLayer < thesky->get_cloud_layer_count(); iLayer++) {
 471             thesky->get_cloud_layer(iLayer)
 472                 ->setCoverage(SGCloudLayer::SG_CLOUD_CLEAR);
 473             thesky->get_cloud_layer(iLayer)->get_layer3D()->clear();
 474         }
 475
 476         station += " 011000Z ";
 477         if( scenario == "Fair weather" ) {
 478                 fakeMetar = "15003KT 12SM SCT033 FEW200 20/08 Q1015 NOSIG";
 479                 //setLayer(0, 3300.0, "scattered", "cu");
 480         } else if( scenario == "Thunderstorm" ) {
 481                 fakeMetar = "15012KT 08SM TSRA SCT040 BKN070 20/12 Q0995";
 482                 setLayer(0, 4000.0, "scattered", "cb");
 483                 setLayer(1, 7000.0, "scattered", "ns");
 484         } else
 485                 return;
 486         FGMetar *m = new FGMetar( station + fakeMetar );
 487         update_metar_properties( m );
 488         update_env_config();
 489         // propagate aloft tables
 490         //_controller->reinit();
 491
 492         fgSetString("/environment/metar/last-metar", m->getData());
 493         // TODO:de-activate real metar updates
 494         if( scenario == "Fair weather" ) {
 495                 fgSetString("/environment/clouds/layer[1]/coverage", "cirrus");
 496         }
 497 }
 498
 499
 500 void FGClouds::build() {
 501         string scenario = fgGetString("/environment/weather-scenario", "METAR");
 502
 503 //        if(!rebuild_required && (scenario == last_scenario))
 504 //            return;
 505
 506         if( last_scenario == "none" ) {
 507         // save clouds and weather conditions
 508             SGPropertyNode *param = fgGetNode("/environment/config", true);
 509             copyProperties( param, last_env_config );
 510             param = fgGetNode("/environment/clouds", true);
 511             copyProperties( param, last_env_clouds );
 512         }
 513
 514         if( scenario == "METAR" ) {
 515             string realMetar = fgGetString("/environment/metar/real-metar", "");
 516
 517             if( realMetar != "" ) {
 518                 fgSetString("/environment/metar/last-metar", realMetar.c_str());
 519                 FGMetar *m = new FGMetar( realMetar );
 520                 update_metar_properties( m );
 521                 update_env_config();
 522                         // propagate aloft tables
 523                 _controller->reinit();
 524                 buildCloudLayers();
 525             }
 526         }
 527         else if( scenario == "none" ) {
 528         // restore clouds and weather conditions
 529             SGPropertyNode *param = fgGetNode("/environment/config", true);
 530             copyProperties( last_env_config, param );
 531             param = fgGetNode("/environment/clouds", true);
 532             copyProperties( last_env_clouds, param );
 533             fgSetDouble("/environment/metar/rain-norm", 0.0);
 534             fgSetDouble("/environment/metar/snow-norm", 0.0);
 535 //          update_env_config();
 536             // propagate aloft tables
 537             _controller->reinit();
 538             buildCloudLayers();
 539         }
 540         else {
 541             buildScenario( scenario );
 542             _controller->reinit();
 543             buildCloudLayers();
 544         }
 545
 546         last_scenario = scenario;
 547
 548         if( snd_lightning == NULL )
 549             init();
 550 }
 551
 552 void FGClouds::set_3dClouds(bool enable)
 553 {
 554     if (enable != clouds_3d_enabled) {
 555         clouds_3d_enabled = enable;
 556
 557         for(int iLayer = 0 ; iLayer < thesky->get_cloud_layer_count(); iLayer++) {
 558             thesky->get_cloud_layer(iLayer)->set_enable3dClouds(enable);
 559
 560             if (!enable) {
 561                 thesky->get_cloud_layer(iLayer)->get_layer3D()->clear();
 562             }
 563         }
 564
 565         if (enable) {
 566             build();
 567         }
 568     }
 569 }
 570
 571 bool FGClouds::get_3dClouds() const {
 572     return clouds_3d_enabled;
 573 }
 574