1 // scenery.cxx -- data structures and routines for managing scenery.
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
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.
31 #include <simgear/debug/logstream.hxx>
32 #include <simgear/scene/tgdb/userdata.hxx>
33 #include <simgear/math/sg_geodesy.hxx>
34 #include <simgear/scene/model/placementtrans.hxx>
35 #include <simgear/scene/material/matlib.hxx>
37 #include <Main/fg_props.hxx>
39 #include "hitlist.hxx"
40 #include "scenery.hxx"
43 // Scenery Management system
44 FGScenery::FGScenery() :
47 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing scenery subsystem" );
51 // Initialize the Scenery Management system
52 FGScenery::~FGScenery() {
56 void FGScenery::init() {
58 scene_graph = new ssgRoot;
59 scene_graph->setName( "Scene" );
62 terrain_branch = new ssgBranch;
63 terrain_branch->setName( "Terrain" );
64 scene_graph->addKid( terrain_branch );
66 models_branch = new ssgBranch;
67 models_branch->setName( "Models" );
68 scene_graph->addKid( models_branch );
70 aircraft_branch = new ssgBranch;
71 aircraft_branch->setName( "Aircraft" );
72 scene_graph->addKid( aircraft_branch );
75 gnd_lights_root = new ssgRoot;
76 gnd_lights_root->setName( "Ground Lighting Root" );
78 vasi_lights_root = new ssgRoot;
79 vasi_lights_root->setName( "VASI/PAPI Lighting Root" );
81 rwy_lights_root = new ssgRoot;
82 rwy_lights_root->setName( "Runway Lighting Root" );
84 taxi_lights_root = new ssgRoot;
85 taxi_lights_root->setName( "Taxi Lighting Root" );
87 // Initials values needed by the draw-time object loader
88 sgUserDataInit( globals->get_model_lib(), globals->get_fg_root(),
89 globals->get_props(), globals->get_sim_time_sec() );
93 void FGScenery::update(double dt) {
97 void FGScenery::bind() {
101 void FGScenery::unbind() {
104 void FGScenery::set_center( const SGVec3d& p ) {
108 placement_list_type::iterator it = _placement_list.begin();
109 while (it != _placement_list.end()) {
110 (*it)->setSceneryCenter(center.sg());
115 void FGScenery::register_placement_transform(ssgPlacementTransform *trans) {
116 _placement_list.push_back(trans);
117 trans->setSceneryCenter(center.sg());
120 void FGScenery::unregister_placement_transform(ssgPlacementTransform *trans) {
121 placement_list_type::iterator it = _placement_list.begin();
122 while (it != _placement_list.end()) {
123 if ((*it) == trans) {
124 it = _placement_list.erase(it);
131 FGScenery::get_elevation_m(double lat, double lon, double max_alt,
132 double& alt, const SGMaterial** material,
135 SGGeod geod = SGGeod::fromDegM(lon, lat, max_alt);
136 SGVec3d pos = SGVec3d::fromGeod(geod);
137 return get_cart_elevation_m(pos, 0, alt, material, exact);
141 FGScenery::get_cart_elevation_m(const SGVec3d& pos, double max_altoff,
142 double& alt, const SGMaterial** material,
145 if ( norm1(pos) < 1 )
148 SGVec3d saved_center = center;
149 bool replaced_center = false;
151 if (30*30 < distSqr(pos, center)) {
153 replaced_center = true;
157 // overridden with actual values if a terrain intersection is
160 double hit_radius = 0.0;
161 SGVec3d hit_normal(0, 0, 0);
167 // scenery center has been properly defined so any hit should
168 // be valid (and not just luck)
169 bool hit = fgCurrentElev(ncpos.sg(), max_altoff+length(pos), sc.sg(),
170 get_scene_graph(), &hit_list, &alt,
171 &hit_radius, hit_normal.sg(), this_hit);
176 ssgEntity *entity = hit_list.get_entity( this_hit );
177 if (entity && entity->isAKindOf(ssgTypeLeaf())) {
178 ssgLeaf* leaf = static_cast<ssgLeaf*>(entity);
179 *material = globals->get_matlib()->findMaterial(leaf);
185 set_center( saved_center );
191 FGScenery::get_cart_ground_intersection(const SGVec3d& pos, const SGVec3d& dir,
192 SGVec3d& nearestHit, bool exact)
194 // We assume that starting positions in the center of the earth are invalid
195 if ( norm1(pos) < 1 )
198 // Well that 'exactness' is somehow problematic, but makes at least sure
199 // that we don't compute that with a cenery center at the other side of
201 SGVec3d saved_center = center;
202 bool replaced_center = false;
204 if (30*30 < distSqr(pos, center)) {
206 replaced_center = true;
210 // Not yet found any hit ...
213 // Make really sure the direction is normalized, is really cheap compared to
214 // computation of ground intersection.
215 SGVec3d normalizedDir = normalize(dir);
216 SGVec3d relativePos = pos - center;
218 // At the moment only intersection with the terrain?
220 hit_list.Intersect(globals->get_scenery()->get_terrain_branch(),
221 relativePos.sg(), normalizedDir.sg());
223 double dist = DBL_MAX;
224 int hitcount = hit_list.num_hits();
225 for (int i = 0; i < hitcount; ++i) {
226 // Check for the nearest hit
227 SGVec3d diff = SGVec3d(hit_list.get_point(i)) - relativePos;
229 // We only want hits in front of us ...
230 if (dot(normalizedDir, diff) < 0)
233 // find the nearest hit
234 double nDist = dot(diff, diff);
238 // Store the hit point
240 nearestHit = SGVec3d(hit_list.get_point(i)) + center;
245 set_center( saved_center );