1 // Build a cloud layer based on metar
3 // Written by Harald JOHNSEN, started April 2005.
5 // Copyright (C) 2005 Harald JOHNSEN - hjohnsen@evc.net
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.
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.
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.
28 #include <Main/fg_props.hxx>
30 #include <simgear/constants.h>
31 #include <simgear/sound/soundmgr_openal.hxx>
32 #include <simgear/scene/sky/sky.hxx>
33 //#include <simgear/environment/visual_enviro.hxx>
34 #include <simgear/scene/sky/cloudfield.hxx>
35 #include <simgear/scene/sky/newcloud.hxx>
36 #include <simgear/structure/commands.hxx>
37 #include <simgear/math/sg_random.h>
38 #include <simgear/props/props_io.hxx>
40 #include <Main/globals.hxx>
41 #include <Airports/simple.hxx>
42 #include <Main/util.hxx>
44 #include "fgclouds.hxx"
49 FGClouds::FGClouds() :
53 clouds_3d_enabled(false),
63 int FGClouds::get_update_event(void) const {
67 void FGClouds::set_update_event(int count) {
72 void FGClouds::Init(void) {
74 if( snd_lightning == NULL ) {
75 snd_lightning = new SGSoundSample("Sounds/thunder.wav", SGPath());
76 snd_lightning->set_max_dist(7000.0f);
77 snd_lightning->set_reference_dist(3000.0f);
78 SGSoundMgr *smgr = globals->get_soundmgr();
79 SGSampleGroup *sgr = smgr->find("weather", true);
80 sgr->add( snd_lightning, "thunder" );
84 globals->get_commands()->addCommand("add-cloud", do_add_3Dcloud);
85 globals->get_commands()->addCommand("del-cloud", do_delete_3Dcloud);
86 globals->get_commands()->addCommand("move-cloud", do_move_3Dcloud);
89 // Build an invidual cloud. Returns the extents of the cloud for coverage calculations
90 double FGClouds::buildCloud(SGPropertyNode *cloud_def_root, SGPropertyNode *box_def_root, const string& name, double grid_z_rand, SGCloudField *layer) {
91 SGPropertyNode *box_def=NULL;
92 SGPropertyNode *cld_def=NULL;
95 SGPath texture_root = globals->get_fg_root();
96 texture_root.append("Textures");
97 texture_root.append("Sky");
99 box_def = box_def_root->getChild(name.c_str());
101 string base_name = name.substr(0,2);
103 if( name[2] == '-' ) {
104 box_def = box_def_root->getChild(base_name.c_str());
110 double x = sg_random() * SGCloudField::fieldSize - (SGCloudField::fieldSize / 2.0);
111 double y = sg_random() * SGCloudField::fieldSize - (SGCloudField::fieldSize / 2.0);
112 double z = grid_z_rand * (sg_random() - 0.5);
114 float lon = fgGetNode("/position/longitude-deg", false)->getFloatValue();
115 float lat = fgGetNode("/position/latitude-deg", false)->getFloatValue();
119 for(int i = 0; i < box_def->nChildren() ; i++) {
120 SGPropertyNode *abox = box_def->getChild(i);
121 if( strcmp(abox->getName(), "box") == 0) {
123 string type = abox->getStringValue("type", "cu-small");
124 cld_def = cloud_def_root->getChild(type.c_str());
125 if ( !cld_def ) return 0.0;
127 double w = abox->getDoubleValue("width", 1000.0);
128 double h = abox->getDoubleValue("height", 1000.0);
129 int hdist = abox->getIntValue("hdist", 1);
130 int vdist = abox->getIntValue("vdist", 1);
132 double c = abox->getDoubleValue("count", 5);
133 int count = (int) (c + (sg_random() - 0.5) * c);
135 extent = max(w*w, extent);
137 for (int j = 0; j < count; j++) {
139 // Locate the clouds randomly in the defined space. The hdist and
140 // vdist values control the horizontal and vertical distribution
141 // by simply summing random components.
146 for (int k = 0; k < hdist; k++)
148 x += (sg_random() / hdist);
149 y += (sg_random() / hdist);
152 for (int k = 0; k < vdist; k++)
154 z += (sg_random() / vdist);
157 x = w * (x - 0.5) + pos[0]; // N/S
158 y = w * (y - 0.5) + pos[1]; // E/W
159 z = h * z + pos[2]; // Up/Down. pos[2] is the cloudbase
161 SGVec3f newpos = SGVec3f(x, y, z);
162 SGNewCloud cld = SGNewCloud(texture_root, cld_def);
164 //layer->addCloud(newpos, cld.genCloud());
165 layer->addCloud(lon, lat, z, x, y, index++, cld.genCloud());
170 // Return the maximum extent of the cloud
174 void FGClouds::buildLayer(int iLayer, const string& name, double coverage) {
179 int CloudVarietyCount = 0;
180 double totalCount = 0.0;
182 SGPropertyNode *cloud_def_root = fgGetNode("/environment/cloudlayers/clouds", false);
183 SGPropertyNode *box_def_root = fgGetNode("/environment/cloudlayers/boxes", false);
184 SGPropertyNode *layer_def_root = fgGetNode("/environment/cloudlayers/layers", false);
185 SGCloudField *layer = thesky->get_cloud_layer(iLayer)->get_layer3D();
188 // If we don't have the required properties, then render the cloud in 2D
189 if ((! clouds_3d_enabled) || coverage == 0.0 ||
190 layer_def_root == NULL || cloud_def_root == NULL || box_def_root == NULL) {
191 thesky->get_cloud_layer(iLayer)->set_enable3dClouds(false);
195 // If we can't find a definition for this cloud type, then render the cloud in 2D
196 SGPropertyNode *layer_def=NULL;
197 layer_def = layer_def_root->getChild(name.c_str());
199 if( name[2] == '-' ) {
200 string base_name = name.substr(0,2);
201 layer_def = layer_def_root->getChild(base_name.c_str());
204 thesky->get_cloud_layer(iLayer)->set_enable3dClouds(false);
209 // At this point, we know we've got some 3D clouds to generate.
210 thesky->get_cloud_layer(iLayer)->set_enable3dClouds(true);
212 double grid_z_rand = layer_def->getDoubleValue("grid-z-rand");
214 for(int i = 0; i < layer_def->nChildren() ; i++) {
215 SGPropertyNode *acloud = layer_def->getChild(i);
216 if( strcmp(acloud->getName(), "cloud") == 0) {
217 string cloud_name = acloud->getStringValue("name");
218 tCloudVariety[CloudVarietyCount].name = cloud_name;
219 double count = acloud->getDoubleValue("count", 1.0);
220 tCloudVariety[CloudVarietyCount].count = count;
222 cloud_name = cloud_name + "-%d";
223 char variety_name[50];
226 snprintf(variety_name, sizeof(variety_name) - 1, cloud_name.c_str(), variety);
227 } while( box_def_root->getChild(variety_name, 0, false) );
230 if( CloudVarietyCount < 20 )
234 totalCount = 1.0 / totalCount;
236 // Determine how much cloud coverage we need in m^2.
237 double cov = coverage * SGCloudField::fieldSize * SGCloudField::fieldSize;
240 double choice = sg_random();
242 for(int i = 0; i < CloudVarietyCount ; i ++) {
243 choice -= tCloudVariety[i].count * totalCount;
244 if( choice <= 0.0 ) {
245 cov -= buildCloud(cloud_def_root,
247 tCloudVariety[i].name,
255 // Now we've built any clouds, enable them and set the density (coverage)
256 //layer->setCoverage(coverage);
257 //layer->applyCoverage();
258 thesky->get_cloud_layer(iLayer)->set_enable3dClouds(clouds_3d_enabled);
261 void FGClouds::buildCloudLayers(void) {
262 SGPropertyNode *metar_root = fgGetNode("/environment", true);
264 //double wind_speed_kt = metar_root->getDoubleValue("wind-speed-kt");
265 double temperature_degc = metar_root->getDoubleValue("temperature-sea-level-degc");
266 double dewpoint_degc = metar_root->getDoubleValue("dewpoint-sea-level-degc");
267 double pressure_mb = metar_root->getDoubleValue("pressure-sea-level-inhg") * SG_INHG_TO_PA / 100.0;
268 double rel_humidity = metar_root->getDoubleValue("relative-humidity");
270 // formule d'Epsy, base d'un cumulus
271 double cumulus_base = 122.0 * (temperature_degc - dewpoint_degc);
272 double stratus_base = 100.0 * (100.0 - rel_humidity) * SG_FEET_TO_METER;
274 for(int iLayer = 0 ; iLayer < thesky->get_cloud_layer_count(); iLayer++) {
275 SGPropertyNode *cloud_root = fgGetNode("/environment/clouds/layer", iLayer, true);
277 double alt_ft = cloud_root->getDoubleValue("elevation-ft");
278 double alt_m = alt_ft * SG_FEET_TO_METER;
279 string coverage = cloud_root->getStringValue("coverage");
281 double coverage_norm = 0.0;
282 if( coverage == "few" )
283 coverage_norm = 2.0/8.0; // <1-2
284 else if( coverage == "scattered" )
285 coverage_norm = 4.0/8.0; // 3-4
286 else if( coverage == "broken" )
287 coverage_norm = 6.0/8.0; // 5-7
288 else if( coverage == "overcast" )
289 coverage_norm = 8.0/8.0; // 8
291 string layer_type = "nn";
293 if( coverage == "cirrus" ) {
295 } else if( alt_ft > 16500 ) {
296 // layer_type = "ci|cs|cc";
298 } else if( alt_ft > 6500 ) {
299 // layer_type = "as|ac|ns";
301 if( pressure_mb < 1005.0 && coverage_norm >= 0.5 )
304 // layer_type = "st|cu|cb|sc";
305 if( cumulus_base * 0.80 < alt_m && cumulus_base * 1.20 > alt_m ) {
306 // +/- 20% from cumulus probable base
308 } else if( stratus_base * 0.80 < alt_m && stratus_base * 1.40 > alt_m ) {
309 // +/- 20% from stratus probable base
312 // above formulae is far from perfect
315 else if( alt_ft < 4500 )
322 cloud_root->setStringValue("layer-type",layer_type);
323 buildLayer(iLayer, layer_type, coverage_norm);
327 void FGClouds::set_3dClouds(bool enable)
329 if (enable != clouds_3d_enabled) {
330 clouds_3d_enabled = enable;
335 bool FGClouds::get_3dClouds() const
337 return clouds_3d_enabled;
341 * Adds a 3D cloud to a cloud layer.
344 * layer - the layer index to add this cloud to. (Defaults to 0)
345 * index - the index for this cloud (to be used later)
346 * lon/lat/alt - the position for the cloud
347 * (Various) - cloud definition properties. See README.3DClouds
351 do_add_3Dcloud (const SGPropertyNode *arg)
353 int l = arg->getIntValue("layer", 0);
354 int index = arg->getIntValue("index", 0);
356 SGPath texture_root = globals->get_fg_root();
357 texture_root.append("Textures");
358 texture_root.append("Sky");
360 float lon = arg->getFloatValue("lon-deg", 0.0f);
361 float lat = arg->getFloatValue("lat-deg", 0.0f);
362 float alt = arg->getFloatValue("alt-ft", 0.0f);
363 float x = arg->getFloatValue("x-offset-m", 0.0f);
364 float y = arg->getFloatValue("y-offset-m", 0.0f);
367 SGCloudField *layer = thesky->get_cloud_layer(l)->get_layer3D();
368 SGNewCloud cld = SGNewCloud(texture_root, arg);
369 bool success = layer->addCloud(lon, lat, alt, x, y, index, cld.genCloud());
371 // Adding a 3D cloud immediately makes this layer 3D.
372 thesky->get_cloud_layer(l)->set_enable3dClouds(true);
378 * Removes a 3D cloud from a cloud layer
382 * layer - the layer index to remove this cloud from. (defaults to 0)
383 * index - the cloud index
387 do_delete_3Dcloud (const SGPropertyNode *arg)
389 int l = arg->getIntValue("layer", 0);
390 int i = arg->getIntValue("index", 0);
392 SGCloudField *layer = thesky->get_cloud_layer(l)->get_layer3D();
393 return layer->deleteCloud(i);
397 * Move a cloud within a 3D layer
400 * layer - the layer index to add this cloud to. (Defaults to 0)
401 * index - the cloud index to move.
402 * lon/lat/alt - the position for the cloud
406 do_move_3Dcloud (const SGPropertyNode *arg)
408 int l = arg->getIntValue("layer", 0);
409 int i = arg->getIntValue("index", 0);
411 float lon = arg->getFloatValue("lon-deg", 0.0f);
412 float lat = arg->getFloatValue("lat-deg", 0.0f);
413 float alt = arg->getFloatValue("alt-ft", 0.0f);
414 float x = arg->getFloatValue("x-offset-m", 0.0f);
415 float y = arg->getFloatValue("y-offset-m", 0.0f);
417 SGCloudField *layer = thesky->get_cloud_layer(l)->get_layer3D();
418 return layer->repositionCloud(i, lon, lat, alt, x, y);