simgear/scene/tgdb/obj.cxx

   1 // obj.cxx -- routines to handle loading scenery and building the plib
   2 //            scene graph.
   3 //
   4 // Written by Curtis Olson, started October 1997.
   5 //
   6 // Copyright (C) 1997  Curtis L. Olson  - http://www.flightgear.org/~curt
   7 //
   8 // This program is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU General Public License as
  10 // published by the Free Software Foundation; either version 2 of the
  11 // License, or (at your option) any later version.
  12 //
  13 // This program is distributed in the hope that it will be useful, but
  14 // WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  21 //
  22 // $Id$
  23
  24
  25 #ifdef HAVE_CONFIG_H
  26 #  include <simgear_config.h>
  27 #endif
  28
  29 #include "obj.hxx"
  30
  31 #include <simgear/compiler.h>
  32
  33 #include <osg/Fog>
  34 #include <osg/Geode>
  35 #include <osg/Geometry>
  36 #include <osg/Group>
  37 #include <osg/LOD>
  38 #include <osg/MatrixTransform>
  39 #include <osg/Point>
  40 #include <osg/Referenced>
  41 #include <osg/StateSet>
  42 #include <osg/Switch>
  43
  44 #include <osgUtil/Simplifier>
  45
  46 #include <boost/foreach.hpp>
  47
  48 #include <algorithm>
  49
  50 #include <simgear/debug/logstream.hxx>
  51 #include <simgear/io/sg_binobj.hxx>
  52 #include <simgear/math/sg_geodesy.hxx>
  53 #include <simgear/math/sg_random.h>
  54 #include <simgear/math/SGMisc.hxx>
  55 #include <simgear/scene/material/Effect.hxx>
  56 #include <simgear/scene/material/EffectGeode.hxx>
  57 #include <simgear/scene/material/mat.hxx>
  58 #include <simgear/scene/material/matmodel.hxx>
  59 #include <simgear/scene/material/matlib.hxx>
  60 #include <simgear/scene/model/SGOffsetTransform.hxx>
  61 #include <simgear/scene/util/SGUpdateVisitor.hxx>
  62 #include <simgear/scene/util/SGNodeMasks.hxx>
  63 #include <simgear/scene/util/QuadTreeBuilder.hxx>
  64 #include <simgear/scene/util/SGReaderWriterOptions.hxx>
  65 #include <simgear/scene/util/OptionsReadFileCallback.hxx>
  66
  67 #include "SGTexturedTriangleBin.hxx"
  68 #include "SGLightBin.hxx"
  69 #include "SGModelBin.hxx"
  70 #include "SGBuildingBin.hxx"
  71 #include "TreeBin.hxx"
  72 #include "SGDirectionalLightBin.hxx"
  73 #include "GroundLightManager.hxx"
  74
  75 #include "pt_lights.hxx"
  76
  77 #define SG_SIMPLIFIER_RATIO 0.001
  78 #define SG_SIMPLIFIER_MAX_LENGTH 1000.0
  79 #define SG_SIMPLIFIER_MAX_ERROR 2000.0
  80 #define SG_OBJECT_RANGE 9000.0
  81 #define SG_TILE_RADIUS 14000.0
  82
  83 using namespace simgear;
  84
  85 typedef std::map<std::string,SGTexturedTriangleBin> SGMaterialTriangleMap;
  86 typedef std::list<SGLightBin> SGLightListBin;
  87 typedef std::list<SGDirectionalLightBin> SGDirectionalLightListBin;
  88
  89 class SGTileGeometryBin : public osg::Referenced {
  90 public:
  91   SGMaterialTriangleMap materialTriangleMap;
  92   SGLightBin tileLights;
  93   SGLightBin randomTileLights;
  94   SGTreeBinList randomForest;
  95   SGDirectionalLightBin runwayLights;
  96   SGDirectionalLightBin taxiLights;
  97   SGDirectionalLightListBin vasiLights;
  98   SGDirectionalLightListBin rabitLights;
  99   SGLightListBin odalLights;
 100   SGDirectionalLightListBin holdshortLights;
 101   SGDirectionalLightListBin guardLights;
 102   SGDirectionalLightListBin reilLights;
 103   SGMatModelBin randomModels;
 104   SGBuildingBinList randomBuildings;
 105
 106   static SGVec4f
 107   getMaterialLightColor(const SGMaterial* material)
 108   {
 109     if (!material)
 110       return SGVec4f(1, 1, 1, 0.8);
 111     return material->get_light_color();
 112   }
 113
 114   static void
 115   addPointGeometry(SGLightBin& lights,
 116                    const std::vector<SGVec3d>& vertices,
 117                    const SGVec4f& color,
 118                    const int_list& pts_v)
 119   {
 120     for (unsigned i = 0; i < pts_v.size(); ++i)
 121       lights.insert(toVec3f(vertices[pts_v[i]]), color);
 122   }
 123
 124   static void
 125   addPointGeometry(SGDirectionalLightBin& lights,
 126                    const std::vector<SGVec3d>& vertices,
 127                    const std::vector<SGVec3f>& normals,
 128                    const SGVec4f& color,
 129                    const int_list& pts_v,
 130                    const int_list& pts_n)
 131   {
 132     // If the normal indices match the vertex indices, use seperate
 133     // normal indices. Else reuse the vertex indices for the normals.
 134     if (pts_v.size() == pts_n.size()) {
 135       for (unsigned i = 0; i < pts_v.size(); ++i)
 136         lights.insert(toVec3f(vertices[pts_v[i]]), normals[pts_n[i]], color);
 137     } else {
 138       for (unsigned i = 0; i < pts_v.size(); ++i)
 139         lights.insert(toVec3f(vertices[pts_v[i]]), normals[pts_v[i]], color);
 140     }
 141   }
 142
 143   bool
 144   insertPtGeometry(const SGBinObject& obj, SGMaterialLib* matlib)
 145   {
 146     if (obj.get_pts_v().size() != obj.get_pts_n().size()) {
 147       SG_LOG(SG_TERRAIN, SG_ALERT,
 148              "Group list sizes for points do not match!");
 149       return false;
 150     }
 151
 152     for (unsigned grp = 0; grp < obj.get_pts_v().size(); ++grp) {
 153       std::string materialName = obj.get_pt_materials()[grp];
 154       SGMaterial* material = 0;
 155       if (matlib)
 156           material = matlib->findCached(materialName);
 157       SGVec4f color = getMaterialLightColor(material);
 158
 159       if (3 <= materialName.size() && materialName.substr(0, 3) != "RWY") {
 160         // Just plain lights. Not something for the runway.
 161         addPointGeometry(tileLights, obj.get_wgs84_nodes(), color,
 162                          obj.get_pts_v()[grp]);
 163       } else if (materialName == "RWY_BLUE_TAXIWAY_LIGHTS"
 164                  || materialName == "RWY_GREEN_TAXIWAY_LIGHTS") {
 165         addPointGeometry(taxiLights, obj.get_wgs84_nodes(), obj.get_normals(),
 166                          color, obj.get_pts_v()[grp], obj.get_pts_n()[grp]);
 167       } else if (materialName == "RWY_VASI_LIGHTS") {
 168         vasiLights.push_back(SGDirectionalLightBin());
 169         addPointGeometry(vasiLights.back(), obj.get_wgs84_nodes(),
 170                          obj.get_normals(), color, obj.get_pts_v()[grp],
 171                          obj.get_pts_n()[grp]);
 172       } else if (materialName == "RWY_SEQUENCED_LIGHTS") {
 173         rabitLights.push_back(SGDirectionalLightBin());
 174         addPointGeometry(rabitLights.back(), obj.get_wgs84_nodes(),
 175                          obj.get_normals(), color, obj.get_pts_v()[grp],
 176                          obj.get_pts_n()[grp]);
 177       } else if (materialName == "RWY_ODALS_LIGHTS") {
 178         odalLights.push_back(SGLightBin());
 179         addPointGeometry(odalLights.back(), obj.get_wgs84_nodes(),
 180                          color, obj.get_pts_v()[grp]);
 181       } else if (materialName == "RWY_YELLOW_PULSE_LIGHTS") {
 182         holdshortLights.push_back(SGDirectionalLightBin());
 183         addPointGeometry(holdshortLights.back(), obj.get_wgs84_nodes(),
 184                          obj.get_normals(), color, obj.get_pts_v()[grp],
 185                          obj.get_pts_n()[grp]);
 186       } else if (materialName == "RWY_GUARD_LIGHTS") {
 187         guardLights.push_back(SGDirectionalLightBin());
 188         addPointGeometry(guardLights.back(), obj.get_wgs84_nodes(),
 189                          obj.get_normals(), color, obj.get_pts_v()[grp],
 190                          obj.get_pts_n()[grp]);
 191       } else if (materialName == "RWY_REIL_LIGHTS") {
 192         reilLights.push_back(SGDirectionalLightBin());
 193         addPointGeometry(reilLights.back(), obj.get_wgs84_nodes(),
 194                          obj.get_normals(), color, obj.get_pts_v()[grp],
 195                          obj.get_pts_n()[grp]);
 196       } else {
 197         // what is left must be runway lights
 198         addPointGeometry(runwayLights, obj.get_wgs84_nodes(),
 199                          obj.get_normals(), color, obj.get_pts_v()[grp],
 200                          obj.get_pts_n()[grp]);
 201       }
 202     }
 203
 204     return true;
 205   }
 206
 207
 208   static SGVec2f
 209   getTexCoord(const std::vector<SGVec2f>& texCoords, const int_list& tc,
 210               const SGVec2f& tcScale, unsigned i)
 211   {
 212     if (tc.empty())
 213       return tcScale;
 214     else if (tc.size() == 1)
 215       return mult(texCoords[tc[0]], tcScale);
 216     else
 217       return mult(texCoords[tc[i]], tcScale);
 218   }
 219
 220   static void
 221   addTriangleGeometry(SGTexturedTriangleBin& triangles,
 222                       const std::vector<SGVec3d>& vertices,
 223                       const std::vector<SGVec3f>& normals,
 224                       const std::vector<SGVec2f>& texCoords,
 225                       const int_list& tris_v,
 226                       const int_list& tris_n,
 227                       const int_list& tris_tc,
 228                       const SGVec2f& tcScale)
 229   {
 230     if (tris_v.size() != tris_n.size()) {
 231       // If the normal indices do not match, they should be inmplicitly
 232       // the same than the vertex indices. So just call ourselves again
 233       // with the matching index vector.
 234       addTriangleGeometry(triangles, vertices, normals, texCoords,
 235                           tris_v, tris_v, tris_tc, tcScale);
 236       return;
 237     }
 238
 239     for (unsigned i = 2; i < tris_v.size(); i += 3) {
 240       SGVertNormTex v0;
 241       v0.vertex = toVec3f(vertices[tris_v[i-2]]);
 242       v0.normal = normals[tris_n[i-2]];
 243       v0.texCoord = getTexCoord(texCoords, tris_tc, tcScale, i-2);
 244       SGVertNormTex v1;
 245       v1.vertex = toVec3f(vertices[tris_v[i-1]]);
 246       v1.normal = normals[tris_n[i-1]];
 247       v1.texCoord = getTexCoord(texCoords, tris_tc, tcScale, i-1);
 248       SGVertNormTex v2;
 249       v2.vertex = toVec3f(vertices[tris_v[i]]);
 250       v2.normal = normals[tris_n[i]];
 251       v2.texCoord = getTexCoord(texCoords, tris_tc, tcScale, i);
 252       triangles.insert(v0, v1, v2);
 253     }
 254   }
 255
 256   static void
 257   addStripGeometry(SGTexturedTriangleBin& triangles,
 258                    const std::vector<SGVec3d>& vertices,
 259                    const std::vector<SGVec3f>& normals,
 260                    const std::vector<SGVec2f>& texCoords,
 261                    const int_list& strips_v,
 262                    const int_list& strips_n,
 263                    const int_list& strips_tc,
 264                    const SGVec2f& tcScale)
 265   {
 266     if (strips_v.size() != strips_n.size()) {
 267       // If the normal indices do not match, they should be inmplicitly
 268       // the same than the vertex indices. So just call ourselves again
 269       // with the matching index vector.
 270       addStripGeometry(triangles, vertices, normals, texCoords,
 271                        strips_v, strips_v, strips_tc, tcScale);
 272       return;
 273     }
 274
 275     for (unsigned i = 2; i < strips_v.size(); ++i) {
 276       SGVertNormTex v0;
 277       v0.vertex = toVec3f(vertices[strips_v[i-2]]);
 278       v0.normal = normals[strips_n[i-2]];
 279       v0.texCoord = getTexCoord(texCoords, strips_tc, tcScale, i-2);
 280       SGVertNormTex v1;
 281       v1.vertex = toVec3f(vertices[strips_v[i-1]]);
 282       v1.normal = normals[strips_n[i-1]];
 283       v1.texCoord = getTexCoord(texCoords, strips_tc, tcScale, i-1);
 284       SGVertNormTex v2;
 285       v2.vertex = toVec3f(vertices[strips_v[i]]);
 286       v2.normal = normals[strips_n[i]];
 287       v2.texCoord = getTexCoord(texCoords, strips_tc, tcScale, i);
 288       if (i%2)
 289         triangles.insert(v1, v0, v2);
 290       else
 291         triangles.insert(v0, v1, v2);
 292     }
 293   }
 294
 295   static void
 296   addFanGeometry(SGTexturedTriangleBin& triangles,
 297                  const std::vector<SGVec3d>& vertices,
 298                  const std::vector<SGVec3f>& normals,
 299                  const std::vector<SGVec2f>& texCoords,
 300                  const int_list& fans_v,
 301                  const int_list& fans_n,
 302                  const int_list& fans_tc,
 303                  const SGVec2f& tcScale)
 304   {
 305     if (fans_v.size() != fans_n.size()) {
 306       // If the normal indices do not match, they should be implicitly
 307       // the same than the vertex indices. So just call ourselves again
 308       // with the matching index vector.
 309       addFanGeometry(triangles, vertices, normals, texCoords,
 310                      fans_v, fans_v, fans_tc, tcScale);
 311       return;
 312     }
 313
 314     SGVertNormTex v0;
 315     v0.vertex = toVec3f(vertices[fans_v[0]]);
 316     v0.normal = normals[fans_n[0]];
 317     v0.texCoord = getTexCoord(texCoords, fans_tc, tcScale, 0);
 318     SGVertNormTex v1;
 319     v1.vertex = toVec3f(vertices[fans_v[1]]);
 320     v1.normal = normals[fans_n[1]];
 321     v1.texCoord = getTexCoord(texCoords, fans_tc, tcScale, 1);
 322     for (unsigned i = 2; i < fans_v.size(); ++i) {
 323       SGVertNormTex v2;
 324       v2.vertex = toVec3f(vertices[fans_v[i]]);
 325       v2.normal = normals[fans_n[i]];
 326       v2.texCoord = getTexCoord(texCoords, fans_tc, tcScale, i);
 327       triangles.insert(v0, v1, v2);
 328       v1 = v2;
 329     }
 330   }
 331
 332   SGVec2f getTexCoordScale(const std::string& name, SGMaterialLib* matlib)
 333   {
 334     if (!matlib)
 335       return SGVec2f(1, 1);
 336     SGMaterial* material = matlib->findCached(name);
 337     if (!material)
 338       return SGVec2f(1, 1);
 339
 340     return material->get_tex_coord_scale();
 341   }
 342
 343   bool
 344   insertSurfaceGeometry(const SGBinObject& obj, SGMaterialLib* matlib)
 345   {
 346     if (obj.get_tris_n().size() < obj.get_tris_v().size() ||
 347         obj.get_tris_tc().size() < obj.get_tris_v().size()) {
 348       SG_LOG(SG_TERRAIN, SG_ALERT,
 349              "Group list sizes for triangles do not match!");
 350       return false;
 351     }
 352
 353     for (unsigned grp = 0; grp < obj.get_tris_v().size(); ++grp) {
 354       std::string materialName = obj.get_tri_materials()[grp];
 355       SGVec2f tcScale = getTexCoordScale(materialName, matlib);
 356       addTriangleGeometry(materialTriangleMap[materialName],
 357                           obj.get_wgs84_nodes(), obj.get_normals(),
 358                           obj.get_texcoords(), obj.get_tris_v()[grp],
 359                           obj.get_tris_n()[grp], obj.get_tris_tc()[grp],
 360                           tcScale);
 361     }
 362
 363     if (obj.get_strips_n().size() < obj.get_strips_v().size() ||
 364         obj.get_strips_tc().size() < obj.get_strips_v().size()) {
 365       SG_LOG(SG_TERRAIN, SG_ALERT,
 366              "Group list sizes for strips do not match!");
 367       return false;
 368     }
 369     for (unsigned grp = 0; grp < obj.get_strips_v().size(); ++grp) {
 370       std::string materialName = obj.get_strip_materials()[grp];
 371       SGVec2f tcScale = getTexCoordScale(materialName, matlib);
 372       addStripGeometry(materialTriangleMap[materialName],
 373                        obj.get_wgs84_nodes(), obj.get_normals(),
 374                        obj.get_texcoords(), obj.get_strips_v()[grp],
 375                        obj.get_strips_n()[grp], obj.get_strips_tc()[grp],
 376                        tcScale);
 377     }
 378
 379     if (obj.get_fans_n().size() < obj.get_fans_v().size() ||
 380         obj.get_fans_tc().size() < obj.get_fans_v().size()) {
 381       SG_LOG(SG_TERRAIN, SG_ALERT,
 382              "Group list sizes for fans do not match!");
 383       return false;
 384     }
 385     for (unsigned grp = 0; grp < obj.get_fans_v().size(); ++grp) {
 386       std::string materialName = obj.get_fan_materials()[grp];
 387       SGVec2f tcScale = getTexCoordScale(materialName, matlib);
 388       addFanGeometry(materialTriangleMap[materialName],
 389                      obj.get_wgs84_nodes(), obj.get_normals(),
 390                      obj.get_texcoords(), obj.get_fans_v()[grp],
 391                      obj.get_fans_n()[grp], obj.get_fans_tc()[grp],
 392                      tcScale);
 393     }
 394     return true;
 395   }
 396
 397   osg::Node* getSurfaceGeometry(SGMaterialLib* matlib, bool useVBOs) const
 398   {
 399     if (materialTriangleMap.empty())
 400       return 0;
 401
 402     EffectGeode* eg = 0;
 403     osg::Group* group = (materialTriangleMap.size() > 1 ? new osg::Group : 0);
 404     //osg::Geode* geode = new osg::Geode;
 405     SGMaterialTriangleMap::const_iterator i;
 406     for (i = materialTriangleMap.begin(); i != materialTriangleMap.end(); ++i) {
 407       osg::Geometry* geometry = i->second.buildGeometry(useVBOs);
 408       SGMaterial *mat = 0;
 409       if (matlib)
 410         mat = matlib->findCached(i->first);
 411       eg = new EffectGeode;
 412       eg->setName("EffectGeode");
 413       if (mat)
 414         eg->setEffect(mat->get_effect(i->second));
 415       eg->addDrawable(geometry);
 416       eg->runGenerators(geometry);  // Generate extra data needed by effect
 417       if (group) {
 418         group->setName("surfaceGeometryGroup");
 419         group->addChild(eg);
 420       }
 421     }
 422     if (group)
 423         return group;
 424     else
 425         return eg;
 426   }
 427
 428   void computeRandomSurfaceLights(SGMaterialLib* matlib)
 429   {
 430     SGMaterialTriangleMap::iterator i;
 431
 432     // generate a repeatable random seed
 433     mt seed;
 434     mt_init(&seed, unsigned(123));
 435
 436     for (i = materialTriangleMap.begin(); i != materialTriangleMap.end(); ++i) {
 437       SGMaterial *mat = matlib->findCached(i->first);
 438       if (!mat)
 439         continue;
 440
 441       float coverage = mat->get_light_coverage();
 442       if (coverage <= 0)
 443         continue;
 444       if (coverage < 10000.0) {
 445         SG_LOG(SG_INPUT, SG_ALERT, "Light coverage is "
 446                << coverage << ", pushing up to 10000");
 447         coverage = 10000;
 448       }
 449
 450       std::vector<SGVec3f> randomPoints;
 451       i->second.addRandomSurfacePoints(coverage, 3, mat->get_object_mask(i->second), randomPoints);
 452       std::vector<SGVec3f>::iterator j;
 453       for (j = randomPoints.begin(); j != randomPoints.end(); ++j) {
 454         float zombie = mt_rand(&seed);
 455         // factor = sg_random() ^ 2, range = 0 .. 1 concentrated towards 0
 456         float factor = mt_rand(&seed);
 457         factor *= factor;
 458
 459         float bright = 1;
 460         SGVec4f color;
 461         if ( zombie > 0.5 ) {
 462           // 50% chance of yellowish
 463           color = SGVec4f(0.9f, 0.9f, 0.3f, bright - factor * 0.2f);
 464         } else if (zombie > 0.15f) {
 465           // 35% chance of whitish
 466           color = SGVec4f(0.9, 0.9f, 0.8f, bright - factor * 0.2f);
 467         } else if (zombie > 0.05f) {
 468           // 10% chance of orangish
 469           color = SGVec4f(0.9f, 0.6f, 0.2f, bright - factor * 0.2f);
 470         } else {
 471           // 5% chance of redish
 472           color = SGVec4f(0.9f, 0.2f, 0.2f, bright - factor * 0.2f);
 473         }
 474         randomTileLights.insert(*j, color);
 475       }
 476     }
 477   }
 478
 479   void computeRandomObjectsAndBuildings(
 480     SGMaterialLib* matlib,
 481     float building_density,
 482     bool use_random_objects,
 483     bool use_random_buildings)
 484   {
 485     SGMaterialTriangleMap::iterator i;
 486
 487     // generate a repeatable random seed
 488     mt seed;
 489     mt_init(&seed, unsigned(123));
 490
 491     for (i = materialTriangleMap.begin(); i != materialTriangleMap.end(); ++i) {
 492       SGMaterial *mat = matlib->findCached(i->first);
 493       SGTexturedTriangleBin triangleBin = i->second;
 494
 495       if (!mat)
 496         continue;
 497
 498       osg::Texture2D* object_mask  = mat->get_object_mask(triangleBin);
 499
 500       int   group_count            = mat->get_object_group_count();
 501       float building_coverage      = mat->get_building_coverage();
 502       float cos_zero_density_angle = mat->get_cos_object_zero_density_slope_angle();
 503       float cos_max_density_angle  = mat->get_cos_object_max_density_slope_angle();
 504
 505       if (building_coverage == 0)
 506          continue;
 507
 508       SGBuildingBin* bin = NULL;
 509
 510       if (building_coverage > 0) {
 511         bin = new SGBuildingBin(mat);
 512         randomBuildings.push_back(bin);
 513       }
 514
 515       unsigned num = i->second.getNumTriangles();
 516       int random_dropped = 0;
 517       int mask_dropped = 0;
 518       int building_dropped = 0;
 519       int triangle_dropped = 0;
 520
 521       for (unsigned i = 0; i < num; ++i) {
 522         SGTexturedTriangleBin::triangle_ref triangleRef = triangleBin.getTriangleRef(i);
 523
 524         SGVec3f vorigin = triangleBin.getVertex(triangleRef[0]).vertex;
 525         SGVec3f v0 = triangleBin.getVertex(triangleRef[1]).vertex - vorigin;
 526         SGVec3f v1 = triangleBin.getVertex(triangleRef[2]).vertex - vorigin;
 527         SGVec2f torigin = triangleBin.getVertex(triangleRef[0]).texCoord;
 528         SGVec2f t0 = triangleBin.getVertex(triangleRef[1]).texCoord - torigin;
 529         SGVec2f t1 = triangleBin.getVertex(triangleRef[2]).texCoord - torigin;
 530         SGVec3f normal = cross(v0, v1);
 531
 532         // Ensure the slope isn't too steep by checking the
 533         // cos of the angle between the slope normal and the
 534         // vertical (conveniently the z-component of the normalized
 535         // normal) and values passed in.
 536         float cos = normalize(normal).z();
 537         float slope_density = 1.0;
 538         if (cos < cos_zero_density_angle) continue; // Too steep for any objects
 539         if (cos < cos_max_density_angle) {
 540           slope_density =
 541             (cos - cos_zero_density_angle) /
 542             (cos_max_density_angle - cos_zero_density_angle);
 543         }
 544
 545         // Containers to hold the random buildings and objects generated
 546         // for this triangle for collision detection purposes.
 547         std::vector< std::pair< SGVec3f, float> > triangleObjectsList;
 548         std::vector< std::pair< SGVec3f, float> > triangleBuildingList;
 549
 550         // Compute the area
 551         float area = 0.5f*length(normal);
 552         if (area <= SGLimitsf::min())
 553           continue;
 554
 555         // Generate any random objects
 556         if (use_random_objects && (group_count > 0))
 557         {
 558           for (int j = 0; j < group_count; j++)
 559           {
 560             SGMatModelGroup *object_group =  mat->get_object_group(j);
 561             int nObjects = object_group->get_object_count();
 562
 563             if (nObjects == 0) continue;
 564
 565             // For each of the random models in the group, determine an appropriate
 566             // number of random placements and insert them.
 567             for (int k = 0; k < nObjects; k++) {
 568               SGMatModel * object = object_group->get_object(k);
 569
 570               // Determine the number of objecst to place, taking into account
 571               // the slope density factor.
 572               double n = slope_density * area / object->get_coverage_m2();
 573
 574               // Use the zombie door method to determine fractional object placement.
 575               n = n + mt_rand(&seed);
 576
 577               // place an object each unit of area
 578               while ( n > 1.0 ) {
 579                 float a = mt_rand(&seed);
 580                 float b = mt_rand(&seed);
 581                 if ( a + b > 1 ) {
 582                   a = 1 - a;
 583                   b = 1 - b;
 584                 }
 585
 586                 SGVec3f randomPoint = vorigin + a*v0 + b*v1;
 587                 float rotation = static_cast<float>(mt_rand(&seed));
 588
 589                 // Check that the point is sufficiently far from
 590                 // the edge of the triangle by measuring the distance
 591                 // from the three lines that make up the triangle.
 592                 float spacing = object->get_spacing_m();
 593
 594                 SGVec3f p = randomPoint - vorigin;
 595                 float edges[] = { length(cross(p     , p - v0)) / length(v0),
 596                                   length(cross(p - v0, p - v1)) / length(v1 - v0),
 597                                   length(cross(p - v1, p     )) / length(v1)      };
 598                 float edge_dist = *std::min_element(edges, edges + 3);
 599
 600                 if (edge_dist < spacing) {
 601                   n -= 1.0;
 602                   continue;
 603                 }
 604
 605                 if (object_mask != NULL) {
 606                   SGVec2f texCoord = torigin + a*t0 + b*t1;
 607
 608                   // Check this random point against the object mask
 609                   // blue (for buildings) channel.
 610                   osg::Image* img = object_mask->getImage();
 611                   unsigned int x = (int) (img->s() * texCoord.x()) % img->s();
 612                   unsigned int y = (int) (img->t() * texCoord.y()) % img->t();
 613
 614                   if (mt_rand(&seed) > img->getColor(x, y).b()) {
 615                     // Failed object mask check
 616                     n -= 1.0;
 617                     continue;
 618                   }
 619
 620                   rotation = img->getColor(x,y).r();
 621                 }
 622
 623                 bool close = false;
 624
 625                 // Check it isn't too close to any other random objects in the triangle
 626                 std::vector<std::pair<SGVec3f, float> >::iterator l;
 627                 for (l = triangleObjectsList.begin(); l != triangleObjectsList.end(); ++l) {
 628                   float min_dist2 = (l->second + object->get_spacing_m()) *
 629                                     (l->second + object->get_spacing_m());
 630
 631                   if (distSqr(l->first, randomPoint) > min_dist2) {
 632                     close = true;
 633                     continue;
 634                   }
 635                 }
 636
 637                 if (!close) {
 638                     triangleObjectsList.push_back(std::make_pair(randomPoint, object->get_spacing_m()));
 639                     randomModels.insert(randomPoint,
 640                                         object,
 641                                         (int)object->get_randomized_range_m(&seed),
 642                                         rotation);
 643                 }
 644               }
 645             }
 646           }
 647         }
 648
 649         // Random objects now generated.  Now generate the random buildings (if any);
 650         if (use_random_buildings && (building_coverage > 0) && (building_density > 0)) {
 651
 652           // Calculate the number of buildings, taking into account building density (which is linear)
 653           // and the slope density factor.
 654           double num = building_density * building_density * slope_density * area / building_coverage;
 655
 656           // For partial units of area, use a zombie door method to
 657           // create the proper random chance of an object being created
 658           // for this triangle.
 659           num = num + mt_rand(&seed);
 660
 661           if (num < 1.0f) {
 662             continue;
 663           }
 664
 665           // Cosine of the angle between the two vectors.
 666           float cosine = (dot(v0, v1) / (length(v0) * length(v1)));
 667
 668           // Determine a grid spacing in each vector such that the correct
 669           // coverage will result.
 670           float stepv0 = (sqrtf(building_coverage) / building_density) / length(v0) / sqrtf(1 - cosine * cosine);
 671           float stepv1 = (sqrtf(building_coverage) / building_density) / length(v1);
 672
 673           stepv0 = std::min(stepv0, 1.0f);
 674           stepv1 = std::min(stepv1, 1.0f);
 675
 676           // Start at a random point. a will be immediately incremented below.
 677           float a = -mt_rand(&seed) * stepv0;
 678           float b = mt_rand(&seed) * stepv1;
 679
 680           // Place an object each unit of area
 681           while (num > 1.0) {
 682             num -= 1.0;
 683
 684             // Set the next location to place a building
 685             a += stepv0;
 686
 687             if ((a + b) > 1.0f) {
 688               // Reached the end of the scan-line on v0. Reset and increment
 689               // scan-line on v1
 690               a = mt_rand(&seed) * stepv0;
 691               b += stepv1;
 692             }
 693
 694             if (b > 1.0f) {
 695               // In a degenerate case of a single point, we might be outside the
 696               // scanline.  Note that we need to still ensure that a+b < 1.
 697               b = mt_rand(&seed) * stepv1 * (1.0f - a);
 698             }
 699
 700             if ((a + b) > 1.0f ) {
 701               // Truly degenerate case - simply choose a random point guaranteed
 702               // to fulfil the constraing of a+b < 1.
 703               a = mt_rand(&seed);
 704               b = mt_rand(&seed) * (1.0f - a);
 705             }
 706
 707             SGVec3f randomPoint = vorigin + a*v0 + b*v1;
 708             float rotation = mt_rand(&seed);
 709
 710             if (object_mask != NULL) {
 711               SGVec2f texCoord = torigin + a*t0 + b*t1;
 712               osg::Image* img = object_mask->getImage();
 713               int x = (int) (img->s() * texCoord.x()) % img->s();
 714               int y = (int) (img->t() * texCoord.y()) % img->t();
 715
 716               // In some degenerate cases x or y can be < 1, in which case the mod operand fails
 717               while (x < 0) x += img->s();
 718               while (y < 0) y += img->t();
 719
 720               if (mt_rand(&seed) < img->getColor(x, y).b()) {
 721                 // Object passes mask. Rotation is taken from the red channel
 722                 rotation = img->getColor(x,y).r();
 723               } else {
 724                 // Fails mask test - try again.
 725                 mask_dropped++;
 726                 continue;
 727               }
 728             }
 729
 730             // Check building isn't too close to the triangle edge.
 731             float type_roll = mt_rand(&seed);
 732             SGBuildingBin::BuildingType buildingtype = bin->getBuildingType(type_roll);
 733             float radius = bin->getBuildingMaxRadius(buildingtype);
 734
 735             // Determine the actual center of the building, by shifting from the
 736             // center of the front face to the true center.
 737             osg::Matrix rotationMat = osg::Matrix::rotate(- rotation * M_PI * 2,
 738                                                  osg::Vec3f(0.0, 0.0, 1.0));
 739             SGVec3f buildingCenter = randomPoint + toSG(osg::Vec3f(-0.5 * bin->getBuildingMaxDepth(buildingtype), 0.0, 0.0) * rotationMat);
 740
 741             SGVec3f p = buildingCenter - vorigin;
 742             float edges[] = { length(cross(p     , p - v0)) / length(v0),
 743                               length(cross(p - v0, p - v1)) / length(v1 - v0),
 744                               length(cross(p - v1, p     )) / length(v1)      };
 745             float edge_dist = *std::min_element(edges, edges + 3);
 746
 747             if (edge_dist < radius) {
 748               triangle_dropped++;
 749               continue;
 750             }
 751
 752             // Check building isn't too close to random objects and other buildings.
 753             bool close = false;
 754             std::vector<std::pair<SGVec3f, float> >::iterator iter;
 755
 756             for (iter = triangleBuildingList.begin(); iter != triangleBuildingList.end(); ++iter) {
 757               float min_dist = iter->second + radius;
 758               if (distSqr(iter->first, buildingCenter) < min_dist * min_dist) {
 759                 close = true;
 760                 continue;
 761               }
 762             }
 763
 764             if (close) {
 765               building_dropped++;
 766               continue;
 767             }
 768
 769             for (iter = triangleObjectsList.begin(); iter != triangleObjectsList.end(); ++iter) {
 770               float min_dist = iter->second + radius;
 771               if (distSqr(iter->first, buildingCenter) < min_dist * min_dist) {
 772                 close = true;
 773                 continue;
 774               }
 775             }
 776
 777             if (close) {
 778               random_dropped++;
 779               continue;
 780             }
 781
 782             std::pair<SGVec3f, float> pt = std::make_pair(buildingCenter, radius);
 783             triangleBuildingList.push_back(pt);
 784             bin->insert(randomPoint, rotation, buildingtype);
 785           }
 786         }
 787
 788         triangleObjectsList.clear();
 789         triangleBuildingList.clear();
 790       }
 791
 792       SG_LOG(SG_TERRAIN, SG_DEBUG, "Random Buildings: " << ((bin) ? bin->getNumBuildings() : 0));
 793       SG_LOG(SG_TERRAIN, SG_DEBUG, "  Dropped due to mask: " << mask_dropped);
 794       SG_LOG(SG_TERRAIN, SG_DEBUG, "  Dropped due to random object: " << random_dropped);
 795       SG_LOG(SG_TERRAIN, SG_DEBUG, "  Dropped due to other buildings: " << building_dropped);
 796     }
 797   }
 798
 799   void computeRandomForest(SGMaterialLib* matlib, float vegetation_density)
 800   {
 801     SGMaterialTriangleMap::iterator i;
 802
 803     // generate a repeatable random seed
 804     mt seed;
 805
 806     mt_init(&seed, unsigned(586));
 807
 808     for (i = materialTriangleMap.begin(); i != materialTriangleMap.end(); ++i) {
 809       SGMaterial *mat = matlib->findCached(i->first);
 810       if (!mat)
 811         continue;
 812
 813       float wood_coverage = mat->get_wood_coverage();
 814       if ((wood_coverage <= 0) || (vegetation_density <= 0))
 815         continue;
 816
 817       // Attributes that don't vary by tree but do vary by material
 818       bool found = false;
 819       TreeBin* bin = NULL;
 820
 821       BOOST_FOREACH(bin, randomForest)
 822       {
 823         if ((bin->texture           == mat->get_tree_texture()  ) &&
 824             (bin->texture_varieties == mat->get_tree_varieties()) &&
 825             (bin->range             == mat->get_tree_range()    ) &&
 826             (bin->width             == mat->get_tree_width()    ) &&
 827             (bin->height            == mat->get_tree_height()   )   ) {
 828             found = true;
 829             break;
 830         }
 831       }
 832
 833       if (!found) {
 834         bin = new TreeBin();
 835         bin->texture = mat->get_tree_texture();
 836           SG_LOG(SG_INPUT, SG_DEBUG, "Tree texture " << bin->texture);
 837         bin->range   = mat->get_tree_range();
 838         bin->width   = mat->get_tree_width();
 839         bin->height  = mat->get_tree_height();
 840         bin->texture_varieties = mat->get_tree_varieties();
 841         randomForest.push_back(bin);
 842       }
 843
 844       std::vector<SGVec3f> randomPoints;
 845       i->second.addRandomTreePoints(wood_coverage,
 846                                     mat->get_object_mask(i->second),
 847                                     vegetation_density,
 848                                     mat->get_cos_tree_max_density_slope_angle(),
 849                                     mat->get_cos_tree_zero_density_slope_angle(),
 850                                     randomPoints);
 851
 852       std::vector<SGVec3f>::iterator k;
 853       for (k = randomPoints.begin(); k != randomPoints.end(); ++k) {
 854         bin->insert(*k);
 855       }
 856     }
 857   }
 858
 859   bool insertBinObj(const SGBinObject& obj, SGMaterialLib* matlib)
 860   {
 861     if (!insertPtGeometry(obj, matlib))
 862       return false;
 863     if (!insertSurfaceGeometry(obj, matlib))
 864       return false;
 865     return true;
 866   }
 867 };
 868
 869 typedef std::pair<osg::Node*, int> ModelLOD;
 870 struct MakeQuadLeaf {
 871     osg::LOD* operator() () const { return new osg::LOD; }
 872 };
 873 struct AddModelLOD {
 874     void operator() (osg::LOD* leaf, ModelLOD& mlod) const
 875     {
 876         leaf->addChild(mlod.first, 0, mlod.second);
 877     }
 878 };
 879 struct GetModelLODCoord {
 880     GetModelLODCoord() {}
 881     GetModelLODCoord(const GetModelLODCoord& rhs)
 882     {}
 883     osg::Vec3 operator() (const ModelLOD& mlod) const
 884     {
 885         return mlod.first->getBound().center();
 886     }
 887 };
 888
 889 typedef QuadTreeBuilder<osg::LOD*, ModelLOD, MakeQuadLeaf, AddModelLOD,
 890                         GetModelLODCoord>  RandomObjectsQuadtree;
 891
 892 class RandomObjectCallback : public OptionsReadFileCallback {
 893 public:
 894     virtual osgDB::ReaderWriter::ReadResult
 895     readNode(const std::string&, const osgDB::Options*)
 896     {
 897         osg::ref_ptr<osg::Group> group = new osg::Group;
 898         group->setName("Random Object and Lighting Group");
 899         group->setDataVariance(osg::Object::STATIC);
 900
 901         osg::Node* node = loadTerrain();
 902         if (node)
 903           group->addChild(node);
 904
 905         osg::LOD* lightLOD = generateLightingTileObjects();
 906         if (lightLOD)
 907           group->addChild(lightLOD);
 908
 909         osg::LOD* objectLOD = generateRandomTileObjects();
 910         if (objectLOD)
 911           group->addChild(objectLOD);
 912
 913         return group.release();
 914     }
 915
 916     // Load terrain if required
 917     osg::Node* loadTerrain()
 918     {
 919       if (! _loadterrain)
 920         return NULL;
 921
 922       SGBinObject tile;
 923       if (!tile.read_bin(_path))
 924         return NULL;
 925
 926       SGMaterialLibPtr matlib;
 927       bool useVBOs = false;
 928       bool simplifyNear    = false;
 929       double ratio       = SG_SIMPLIFIER_RATIO;
 930       double maxLength   = SG_SIMPLIFIER_MAX_LENGTH;
 931       double maxError    = SG_SIMPLIFIER_MAX_ERROR;
 932
 933       if (_options) {
 934         matlib = _options->getMaterialLib();
 935         useVBOs = (_options->getPluginStringData("SimGear::USE_VBOS") == "ON");
 936         SGPropertyNode* propertyNode = _options->getPropertyNode().get();
 937         simplifyNear = propertyNode->getBoolValue("/sim/rendering/terrain/simplifier/enabled-near", simplifyNear);
 938         ratio = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/ratio", ratio);
 939         maxLength = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-length", maxLength);
 940         maxError = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-error", maxError);
 941       }
 942
 943       SGVec3d center = tile.get_gbs_center();
 944       SGGeod geodPos = SGGeod::fromCart(center);
 945       SGQuatd hlOr = SGQuatd::fromLonLat(geodPos)*SGQuatd::fromEulerDeg(0, 0, 180);
 946
 947       // rotate the tiles so that the bounding boxes get nearly axis aligned.
 948       // this will help the collision tree's bounding boxes a bit ...
 949       std::vector<SGVec3d> nodes = tile.get_wgs84_nodes();
 950       for (unsigned i = 0; i < nodes.size(); ++i)
 951         nodes[i] = hlOr.transform(nodes[i]);
 952       tile.set_wgs84_nodes(nodes);
 953
 954       SGQuatf hlOrf(hlOr[0], hlOr[1], hlOr[2], hlOr[3]);
 955       std::vector<SGVec3f> normals = tile.get_normals();
 956       for (unsigned i = 0; i < normals.size(); ++i)
 957         normals[i] = hlOrf.transform(normals[i]);
 958       tile.set_normals(normals);
 959
 960       osg::ref_ptr<SGTileGeometryBin> tileGeometryBin = new SGTileGeometryBin;
 961
 962       if (!tileGeometryBin->insertBinObj(tile, matlib))
 963         return NULL;
 964
 965       osg::Node* node = tileGeometryBin->getSurfaceGeometry(matlib, useVBOs);
 966       if (node && simplifyNear) {
 967         osgUtil::Simplifier simplifier(ratio, maxError, maxLength);
 968         node->accept(simplifier);
 969       }
 970
 971       return node;
 972     }
 973
 974     // Generate all the lighting objects for the tile.
 975     osg::LOD* generateLightingTileObjects()
 976     {
 977       SGMaterialLibPtr matlib;
 978
 979       if (_options)
 980         matlib = _options->getMaterialLib();
 981
 982       // FIXME: ugly, has a side effect
 983       if (matlib)
 984         _tileGeometryBin->computeRandomSurfaceLights(matlib);
 985
 986       GroundLightManager* lightManager = GroundLightManager::instance();
 987       osg::ref_ptr<osg::Group> lightGroup = new SGOffsetTransform(0.94);
 988       SGVec3f up(0, 0, 1);
 989
 990       if (_tileGeometryBin->tileLights.getNumLights() > 0
 991           || _tileGeometryBin->randomTileLights.getNumLights() > 0) {
 992         osg::Group* groundLights0 = new osg::Group;
 993         groundLights0->setStateSet(lightManager->getGroundLightStateSet());
 994         groundLights0->setNodeMask(GROUNDLIGHTS0_BIT);
 995         osg::Geode* geode = new osg::Geode;
 996         geode->addDrawable(SGLightFactory::getLights(_tileGeometryBin->tileLights));
 997         geode->addDrawable(SGLightFactory::getLights(_tileGeometryBin->randomTileLights, 4, -0.3f));
 998         groundLights0->addChild(geode);
 999         lightGroup->addChild(groundLights0);
1000       }
1001
1002       if (_tileGeometryBin->randomTileLights.getNumLights() > 0) {
1003         osg::Group* groundLights1 = new osg::Group;
1004         groundLights1->setStateSet(lightManager->getGroundLightStateSet());
1005         groundLights1->setNodeMask(GROUNDLIGHTS1_BIT);
1006         osg::Group* groundLights2 = new osg::Group;
1007         groundLights2->setStateSet(lightManager->getGroundLightStateSet());
1008         groundLights2->setNodeMask(GROUNDLIGHTS2_BIT);
1009         osg::Geode* geode = new osg::Geode;
1010         geode->addDrawable(SGLightFactory::getLights(_tileGeometryBin->randomTileLights, 2, -0.15f));
1011         groundLights1->addChild(geode);
1012         lightGroup->addChild(groundLights1);
1013         geode = new osg::Geode;
1014         geode->addDrawable(SGLightFactory::getLights(_tileGeometryBin->randomTileLights));
1015         groundLights2->addChild(geode);
1016         lightGroup->addChild(groundLights2);
1017       }
1018
1019       if (!_tileGeometryBin->vasiLights.empty()) {
1020         EffectGeode* vasiGeode = new EffectGeode;
1021         Effect* vasiEffect
1022             = getLightEffect(24, osg::Vec3(1, 0.0001, 0.000001), 1, 24, true, _options);
1023         vasiGeode->setEffect(vasiEffect);
1024         SGVec4f red(1, 0, 0, 1);
1025         SGMaterial* mat = 0;
1026         if (matlib)
1027           mat = matlib->findCached("RWY_RED_LIGHTS");
1028         if (mat)
1029           red = mat->get_light_color();
1030         SGVec4f white(1, 1, 1, 1);
1031         mat = 0;
1032         if (matlib)
1033           mat = matlib->findCached("RWY_WHITE_LIGHTS");
1034         if (mat)
1035           white = mat->get_light_color();
1036         SGDirectionalLightListBin::const_iterator i;
1037         for (i = _tileGeometryBin->vasiLights.begin();
1038              i != _tileGeometryBin->vasiLights.end(); ++i) {
1039           vasiGeode->addDrawable(SGLightFactory::getVasi(up, *i, red, white));
1040         }
1041         vasiGeode->setStateSet(lightManager->getRunwayLightStateSet());
1042         lightGroup->addChild(vasiGeode);
1043       }
1044
1045       Effect* runwayEffect = 0;
1046       if (_tileGeometryBin->runwayLights.getNumLights() > 0
1047           || !_tileGeometryBin->rabitLights.empty()
1048           || !_tileGeometryBin->reilLights.empty()
1049           || !_tileGeometryBin->odalLights.empty()
1050           || _tileGeometryBin->taxiLights.getNumLights() > 0)
1051           runwayEffect = getLightEffect(16, osg::Vec3(1, 0.001, 0.0002), 1, 16, true, _options);
1052       if (_tileGeometryBin->runwayLights.getNumLights() > 0
1053           || !_tileGeometryBin->rabitLights.empty()
1054           || !_tileGeometryBin->reilLights.empty()
1055           || !_tileGeometryBin->odalLights.empty()
1056           || !_tileGeometryBin->holdshortLights.empty()
1057           || !_tileGeometryBin->guardLights.empty()) {
1058         osg::Group* rwyLights = new osg::Group;
1059         rwyLights->setStateSet(lightManager->getRunwayLightStateSet());
1060         rwyLights->setNodeMask(RUNWAYLIGHTS_BIT);
1061         if (_tileGeometryBin->runwayLights.getNumLights() != 0) {
1062           EffectGeode* geode = new EffectGeode;
1063           geode->setEffect(runwayEffect);
1064           geode->addDrawable(SGLightFactory::getLights(_tileGeometryBin->runwayLights));
1065           rwyLights->addChild(geode);
1066         }
1067         SGDirectionalLightListBin::const_iterator i;
1068         for (i = _tileGeometryBin->rabitLights.begin();
1069              i != _tileGeometryBin->rabitLights.end(); ++i) {
1070           rwyLights->addChild(SGLightFactory::getSequenced(*i, _options));
1071         }
1072         for (i = _tileGeometryBin->reilLights.begin();
1073              i != _tileGeometryBin->reilLights.end(); ++i) {
1074           rwyLights->addChild(SGLightFactory::getSequenced(*i, _options));
1075         }
1076         for (i = _tileGeometryBin->holdshortLights.begin();
1077              i != _tileGeometryBin->holdshortLights.end(); ++i) {
1078           rwyLights->addChild(SGLightFactory::getHoldShort(*i, _options));
1079         }
1080         for (i = _tileGeometryBin->guardLights.begin();
1081              i != _tileGeometryBin->guardLights.end(); ++i) {
1082           rwyLights->addChild(SGLightFactory::getGuard(*i, _options));
1083         }
1084         SGLightListBin::const_iterator j;
1085         for (j = _tileGeometryBin->odalLights.begin();
1086              j != _tileGeometryBin->odalLights.end(); ++j) {
1087           rwyLights->addChild(SGLightFactory::getOdal(*j, _options));
1088         }
1089         lightGroup->addChild(rwyLights);
1090       }
1091
1092       if (_tileGeometryBin->taxiLights.getNumLights() > 0) {
1093         osg::Group* taxiLights = new osg::Group;
1094         taxiLights->setStateSet(lightManager->getTaxiLightStateSet());
1095         taxiLights->setNodeMask(RUNWAYLIGHTS_BIT);
1096         EffectGeode* geode = new EffectGeode;
1097         geode->setEffect(runwayEffect);
1098         geode->addDrawable(SGLightFactory::getLights(_tileGeometryBin->taxiLights));
1099         taxiLights->addChild(geode);
1100         lightGroup->addChild(taxiLights);
1101       }
1102
1103       osg::LOD* lightLOD = NULL;
1104
1105       if (lightGroup->getNumChildren() > 0) {
1106         lightLOD = new osg::LOD;
1107         lightLOD->addChild(lightGroup.get(), 0, 60000);
1108         // VASI is always on, so doesn't use light bits.
1109         lightLOD->setNodeMask(LIGHTS_BITS | MODEL_BIT | PERMANENTLIGHT_BIT);
1110       }
1111
1112       return lightLOD;
1113     }
1114
1115     // Generate all the random forest, objects and buildings for the tile
1116     osg::LOD* generateRandomTileObjects()
1117     {
1118       SGMaterialLibPtr matlib;
1119       bool use_random_objects = false;
1120       bool use_random_vegetation = false;
1121       bool use_random_buildings = false;
1122       float vegetation_density = 1.0f;
1123       float building_density = 1.0f;
1124
1125       osg::ref_ptr<osg::Group> randomObjects;
1126       osg::ref_ptr<osg::Group> forestNode;
1127       osg::ref_ptr<osg::Group> buildingNode;
1128
1129       if (_options) {
1130         matlib = _options->getMaterialLib();
1131         SGPropertyNode* propertyNode = _options->getPropertyNode().get();
1132         if (propertyNode) {
1133             use_random_objects
1134                 = propertyNode->getBoolValue("/sim/rendering/random-objects",
1135                                              use_random_objects);
1136             use_random_vegetation
1137                 = propertyNode->getBoolValue("/sim/rendering/random-vegetation",
1138                                              use_random_vegetation);
1139             vegetation_density
1140                 = propertyNode->getFloatValue("/sim/rendering/vegetation-density",
1141                                               vegetation_density);
1142             use_random_buildings
1143                 = propertyNode->getBoolValue("/sim/rendering/random-buildings",
1144                                              use_random_buildings);
1145             building_density
1146                 = propertyNode->getFloatValue("/sim/rendering/building-density",
1147                                               building_density);
1148         }
1149       }
1150
1151
1152
1153       if (matlib && (use_random_objects || use_random_buildings)) {
1154         _tileGeometryBin->computeRandomObjectsAndBuildings(matlib,
1155                                                          building_density,
1156                                                          use_random_objects,
1157                                                          use_random_buildings);
1158       }
1159
1160
1161       if (_tileGeometryBin->randomModels.getNumModels() > 0) {
1162         // Generate a repeatable random seed
1163         mt seed;
1164         mt_init(&seed, unsigned(123));
1165
1166         std::vector<ModelLOD> models;
1167         for (unsigned int i = 0;
1168              i < _tileGeometryBin->randomModels.getNumModels(); i++) {
1169           SGMatModelBin::MatModel obj
1170             = _tileGeometryBin->randomModels.getMatModel(i);
1171
1172           SGPropertyNode* root = _options->getPropertyNode()->getRootNode();
1173           osg::Node* node = obj.model->get_random_model(root, &seed);
1174
1175           // Create a matrix to place the object in the correct
1176           // location, and then apply the rotation matrix created
1177           // above, with an additional random (or taken from
1178           // the object mask) heading rotation if appropriate.
1179           osg::Matrix transformMat;
1180           transformMat = osg::Matrix::translate(toOsg(obj.position));
1181           if (obj.model->get_heading_type() == SGMatModel::HEADING_RANDOM) {
1182             // Rotate the object around the z axis.
1183             double hdg = mt_rand(&seed) * M_PI * 2;
1184             transformMat.preMult(osg::Matrix::rotate(hdg,
1185                                                      osg::Vec3d(0.0, 0.0, 1.0)));
1186           }
1187
1188           if (obj.model->get_heading_type() == SGMatModel::HEADING_MASK) {
1189             // Rotate the object around the z axis.
1190             double hdg =  - obj.rotation * M_PI * 2;
1191             transformMat.preMult(osg::Matrix::rotate(hdg,
1192                                                      osg::Vec3d(0.0, 0.0, 1.0)));
1193           }
1194
1195           osg::MatrixTransform* position =
1196             new osg::MatrixTransform(transformMat);
1197           position->setName("positionRandomModel");
1198           position->addChild(node);
1199           models.push_back(ModelLOD(position, obj.lod));
1200         }
1201         RandomObjectsQuadtree quadtree((GetModelLODCoord()), (AddModelLOD()));
1202         quadtree.buildQuadTree(models.begin(), models.end());
1203         randomObjects = quadtree.getRoot();
1204         randomObjects->setName("Random objects");
1205       }
1206
1207       if (! _tileGeometryBin->randomBuildings.empty()) {
1208         buildingNode = createRandomBuildings(_tileGeometryBin->randomBuildings, osg::Matrix::identity(),
1209                                     _options);
1210         buildingNode->setName("Random buildings");
1211         _tileGeometryBin->randomBuildings.clear();
1212       }
1213
1214       if (use_random_vegetation && matlib) {
1215         // Now add some random forest.
1216         _tileGeometryBin->computeRandomForest(matlib, vegetation_density);
1217
1218         if (! _tileGeometryBin->randomForest.empty()) {
1219           forestNode = createForest(_tileGeometryBin->randomForest, osg::Matrix::identity(),
1220                                     _options);
1221           forestNode->setName("Random trees");
1222         }
1223       }
1224
1225       osg::LOD* objectLOD = NULL;
1226
1227       if (randomObjects.valid() ||  forestNode.valid() || buildingNode.valid()) {
1228         objectLOD = new osg::LOD;
1229
1230         if (randomObjects.valid()) objectLOD->addChild(randomObjects.get(), 0, 20000);
1231         if (forestNode.valid())  objectLOD->addChild(forestNode.get(), 0, 20000);
1232         if (buildingNode.valid()) objectLOD->addChild(buildingNode.get(), 0, 20000);
1233
1234         unsigned nodeMask = SG_NODEMASK_CASTSHADOW_BIT | SG_NODEMASK_RECEIVESHADOW_BIT | SG_NODEMASK_TERRAIN_BIT;
1235         objectLOD->setNodeMask(nodeMask);
1236       }
1237
1238       return objectLOD;
1239     }
1240
1241     /// The original options to use for this bunch of models
1242     osg::ref_ptr<SGReaderWriterOptions> _options;
1243     osg::ref_ptr<SGTileGeometryBin> _tileGeometryBin;
1244     string _path;
1245     bool _loadterrain;
1246 };
1247
1248 osg::Node*
1249 SGLoadBTG(const std::string& path, const simgear::SGReaderWriterOptions* options)
1250 {
1251     SGBinObject tile;
1252     if (!tile.read_bin(path))
1253       return NULL;
1254
1255     SGMaterialLibPtr matlib;
1256     bool useVBOs = false;
1257     bool simplifyDistant = false;
1258     bool simplifyNear    = false;
1259     double ratio       = SG_SIMPLIFIER_RATIO;
1260     double maxLength   = SG_SIMPLIFIER_MAX_LENGTH;
1261     double maxError    = SG_SIMPLIFIER_MAX_ERROR;
1262     double object_range = SG_OBJECT_RANGE;
1263
1264     if (options) {
1265       matlib = options->getMaterialLib();
1266       useVBOs = (options->getPluginStringData("SimGear::USE_VBOS") == "ON");
1267       SGPropertyNode* propertyNode = options->getPropertyNode().get();
1268
1269       // We control whether we simplify the nearby terrain and distant terrain separatey.
1270       // However, we don't allow only simplifying the near terrain!
1271       simplifyNear = propertyNode->getBoolValue("/sim/rendering/terrain/simplifier/enabled-near", simplifyNear);
1272       simplifyDistant = simplifyNear || propertyNode->getBoolValue("/sim/rendering/terrain/simplifier/enabled-far", simplifyDistant);
1273       ratio = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/ratio", ratio);
1274       maxLength = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-length", maxLength);
1275       maxError = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-error", maxError);
1276                         object_range = propertyNode->getDoubleValue("/sim/rendering/static-lod/rough", object_range);
1277     }
1278
1279     SGVec3d center = tile.get_gbs_center();
1280     SGGeod geodPos = SGGeod::fromCart(center);
1281     SGQuatd hlOr = SGQuatd::fromLonLat(geodPos)*SGQuatd::fromEulerDeg(0, 0, 180);
1282
1283     // rotate the tiles so that the bounding boxes get nearly axis aligned.
1284     // this will help the collision tree's bounding boxes a bit ...
1285     std::vector<SGVec3d> nodes = tile.get_wgs84_nodes();
1286     for (unsigned i = 0; i < nodes.size(); ++i)
1287       nodes[i] = hlOr.transform(nodes[i]);
1288     tile.set_wgs84_nodes(nodes);
1289
1290     SGQuatf hlOrf(hlOr[0], hlOr[1], hlOr[2], hlOr[3]);
1291     std::vector<SGVec3f> normals = tile.get_normals();
1292     for (unsigned i = 0; i < normals.size(); ++i)
1293       normals[i] = hlOrf.transform(normals[i]);
1294     tile.set_normals(normals);
1295
1296     osg::ref_ptr<SGTileGeometryBin> tileGeometryBin = new SGTileGeometryBin;
1297
1298     if (!tileGeometryBin->insertBinObj(tile, matlib))
1299       return NULL;
1300
1301
1302     osg::Node* node = tileGeometryBin->getSurfaceGeometry(matlib, useVBOs);
1303     if (node && simplifyDistant) {
1304       osgUtil::Simplifier simplifier(ratio, maxError, maxLength);
1305       node->accept(simplifier);
1306     }
1307
1308     // The toplevel transform for that tile.
1309     osg::MatrixTransform* transform = new osg::MatrixTransform;
1310     transform->setName(path);
1311     transform->setMatrix(osg::Matrix::rotate(toOsg(hlOr))*
1312                          osg::Matrix::translate(toOsg(center)));
1313
1314     // PagedLOD for the random objects so we don't need to generate
1315     // them all on tile loading.
1316     osg::PagedLOD* pagedLOD = new osg::PagedLOD;
1317     pagedLOD->setCenterMode(osg::PagedLOD::USE_BOUNDING_SPHERE_CENTER);
1318     pagedLOD->setName("pagedObjectLOD");
1319
1320     if (node) {
1321       if (simplifyNear == simplifyDistant) {
1322         // Same terrain type is used for both near and far distances,
1323         // so add it to the main group.
1324         osg::Group* terrainGroup = new osg::Group;
1325         terrainGroup->setName("BTGTerrainGroup");
1326         terrainGroup->addChild(node);
1327         transform->addChild(terrainGroup);
1328       } else if (simplifyDistant) {
1329         // Simplified terrain is only used in the distance, the
1330         // call-back below will re-generate the closer version
1331         pagedLOD->addChild(node, object_range + SG_TILE_RADIUS, FLT_MAX);
1332       }
1333     }
1334
1335     // we just need to know about the read file callback that itself holds the data
1336     osg::ref_ptr<RandomObjectCallback> randomObjectCallback = new RandomObjectCallback;
1337     randomObjectCallback->_options = SGReaderWriterOptions::copyOrCreate(options);
1338     randomObjectCallback->_tileGeometryBin = tileGeometryBin;
1339     randomObjectCallback->_path = std::string(path);
1340     randomObjectCallback->_loadterrain = ! (simplifyNear == simplifyDistant);
1341
1342     osg::ref_ptr<osgDB::Options> callbackOptions = new osgDB::Options;
1343     callbackOptions->setReadFileCallback(randomObjectCallback.get());
1344     pagedLOD->setDatabaseOptions(callbackOptions.get());
1345
1346     pagedLOD->setFileName(pagedLOD->getNumChildren(), "Dummy name - use the stored data in the read file callback");
1347     pagedLOD->setRange(pagedLOD->getNumChildren(), 0, object_range + SG_TILE_RADIUS);
1348     transform->addChild(pagedLOD);
1349     transform->setNodeMask( ~simgear::MODELLIGHT_BIT );
1350
1351     return transform;
1352 }