src/Objects/obj.cxx

   1 // obj.cxx -- routines to handle "sorta" WaveFront .obj format files.
   2 //
   3 // Written by Curtis Olson, started October 1997.
   4 //
   5 // Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #ifdef FG_MATH_EXCEPTION_CLASH
  29 #  include <math.h>
  30 #endif
  31
  32 #include <stdio.h>
  33 #include <string.h>
  34
  35 // #if defined ( __sun__ )
  36 // extern "C" void *memmove(void *, const void *, size_t);
  37 // extern "C" void *memset(void *, int, size_t);
  38 // #endif
  39
  40 #include <Include/compiler.h>
  41
  42 #include STL_STRING
  43 #include <map>                  // STL
  44 #include <vector>               // STL
  45 #include <ctype.h>              // isdigit()
  46
  47 #include <Debug/logstream.hxx>
  48 #include <Misc/fgstream.hxx>
  49 #include <Include/fg_constants.h>
  50 #include <Main/options.hxx>
  51 #include <Math/mat3.h>
  52 #include <Math/fg_geodesy.hxx>
  53 #include <Math/fg_random.h>
  54 #include <Math/point3d.hxx>
  55 #include <Math/polar3d.hxx>
  56 #include <Misc/stopwatch.hxx>
  57 #include <Misc/texcoord.hxx>
  58 #include <Scenery/tileentry.hxx>
  59
  60 #include "materialmgr.hxx"
  61 #include "obj.hxx"
  62
  63 FG_USING_STD(string);
  64 FG_USING_STD(vector);
  65
  66
  67 typedef vector < int > int_list;
  68 typedef int_list::iterator int_list_iterator;
  69 typedef int_list::const_iterator int_point_list_iterator;
  70
  71
  72 static double normals[FG_MAX_NODES][3];
  73 static double tex_coords[FG_MAX_NODES*3][3];
  74
  75
  76 // given three points defining a triangle, calculate the normal
  77 static void calc_normal(Point3D p1, Point3D p2,
  78                         Point3D p3, double normal[3])
  79 {
  80     double v1[3], v2[3];
  81     double temp;
  82
  83     v1[0] = p2[0] - p1[0]; v1[1] = p2[1] - p1[1]; v1[2] = p2[2] - p1[2];
  84     v2[0] = p3[0] - p1[0]; v2[1] = p3[1] - p1[1]; v2[2] = p3[2] - p1[2];
  85
  86     MAT3cross_product(normal, v1, v2);
  87     MAT3_NORMALIZE_VEC(normal,temp);
  88
  89     // fgPrintf( FG_TERRAIN, FG_DEBUG, "  Normal = %.2f %.2f %.2f\n",
  90     //           normal[0], normal[1], normal[2]);
  91 }
  92
  93
  94 #define FG_TEX_CONSTANT 69.0
  95
  96 // Calculate texture coordinates for a given point.
  97 static Point3D local_calc_tex_coords(const Point3D& node, const Point3D& ref) {
  98     Point3D cp;
  99     Point3D pp;
 100     // double tmplon, tmplat;
 101
 102     // cout << "-> " << node[0] << " " << node[1] << " " << node[2] << endl;
 103     // cout << "-> " << ref.x() << " " << ref.y() << " " << ref.z() << endl;
 104
 105     cp = Point3D( node[0] + ref.x(),
 106                   node[1] + ref.y(),
 107                   node[2] + ref.z() );
 108
 109     pp = fgCartToPolar3d(cp);
 110
 111     // tmplon = pp.lon() * RAD_TO_DEG;
 112     // tmplat = pp.lat() * RAD_TO_DEG;
 113     // cout << tmplon << " " << tmplat << endl;
 114
 115     pp.setx( fmod(RAD_TO_DEG * FG_TEX_CONSTANT * pp.x(), 11.0) );
 116     pp.sety( fmod(RAD_TO_DEG * FG_TEX_CONSTANT * pp.y(), 11.0) );
 117
 118     if ( pp.x() < 0.0 ) {
 119         pp.setx( pp.x() + 11.0 );
 120     }
 121
 122     if ( pp.y() < 0.0 ) {
 123         pp.sety( pp.y() + 11.0 );
 124     }
 125
 126     // cout << pp << endl;
 127
 128     return(pp);
 129 }
 130
 131
 132 // Generate a generic ocean tile on the fly
 133 ssgBranch *fgGenTile( const string& path, FGTileEntry *t) {
 134     fgFRAGMENT fragment;
 135     fragment.init();
 136     fragment.tile_ptr = t;
 137
 138     ssgSimpleState *state = NULL;
 139
 140     ssgBranch *tile = new ssgBranch () ;
 141     tile -> setName ( (char *)path.c_str() ) ;
 142
 143     // find Ocean material in the properties list
 144     if ( ! material_mgr.find( "Ocean", fragment.material_ptr )) {
 145         FG_LOG( FG_TERRAIN, FG_ALERT,
 146                 "Ack! unknown usemtl name = " << "Ocean"
 147                 << " in " << path );
 148     }
 149
 150     // set the texture width and height values for this
 151     // material
 152     FGMaterial m = fragment.material_ptr->get_m();
 153     double tex_width = m.get_xsize();
 154     double tex_height = m.get_ysize();
 155
 156     // set ssgState
 157     state = fragment.material_ptr->get_state();
 158
 159     // Calculate center point
 160     FGBucket b = t->tile_bucket;
 161     double clon = b.get_center_lon();
 162     double clat = b.get_center_lat();
 163     double height = b.get_height();
 164     double width = b.get_width();
 165
 166     Point3D center = fgGeodToCart(Point3D(clon*DEG_TO_RAD,clat*DEG_TO_RAD,0.0));
 167     t->center = center;
 168     fragment.center = center;
 169     // cout << "center = " << center << endl;;
 170
 171     // Caculate corner vertices
 172     Point3D geod[4];
 173     geod[0] = Point3D( clon - width/2.0, clat - height/2.0, 0.0 );
 174     geod[1] = Point3D( clon + width/2.0, clat - height/2.0, 0.0 );
 175     geod[2] = Point3D( clon + width/2.0, clat + height/2.0, 0.0 );
 176     geod[3] = Point3D( clon - width/2.0, clat + height/2.0, 0.0 );
 177
 178     Point3D rad[4];
 179     int i;
 180     for ( i = 0; i < 4; ++i ) {
 181         rad[i] = Point3D( geod[i].x() * DEG_TO_RAD, geod[i].y() * DEG_TO_RAD,
 182                           geod[i].z() );
 183     }
 184
 185     Point3D cart[4], rel[4];
 186     t->nodes.clear();
 187     for ( i = 0; i < 4; ++i ) {
 188         cart[i] = fgGeodToCart(rad[i]);
 189         rel[i] = cart[i] - center;
 190         t->nodes.push_back( rel[i] );
 191         // cout << "corner " << i << " = " << cart[i] << endl;
 192     }
 193
 194     t->ncount = 4;
 195
 196     // Calculate bounding radius
 197     t->bounding_radius = center.distance3D( cart[0] );
 198     fragment.bounding_radius = t->bounding_radius;
 199     // cout << "bounding radius = " << t->bounding_radius << endl;
 200
 201     // Calculate normals
 202     Point3D normals[4];
 203     for ( i = 0; i < 4; ++i ) {
 204         normals[i] = cart[i];
 205         double length = normals[i].distance3D( Point3D(0.0) );
 206         normals[i] /= length;
 207         // cout << "normal = " << normals[i] << endl;
 208     }
 209
 210     // Calculate texture coordinates
 211     point_list geod_nodes;
 212     geod_nodes.clear();
 213     for ( i = 0; i < 4; ++i ) {
 214         geod_nodes.push_back( geod[i] );
 215     }
 216     int_list rectangle;
 217     rectangle.clear();
 218     for ( i = 0; i < 4; ++i ) {
 219         rectangle.push_back( i );
 220     }
 221     point_list texs = calc_tex_coords( b, geod_nodes, rectangle,
 222                                        1000.0 / tex_width );
 223
 224     // Build flight gear structure
 225     fragment.add_face(0, 1, 2);
 226     fragment.add_face(0, 2, 3);
 227     t->fragment_list.push_back(fragment);
 228
 229     // Allocate ssg structure
 230     sgVec3 *vtlist = new sgVec3 [ 4 ];
 231     t->vec3_ptrs.push_back( vtlist );
 232     sgVec3 *vnlist = new sgVec3 [ 4 ];
 233     t->vec3_ptrs.push_back( vnlist );
 234     sgVec2 *tclist = new sgVec2 [ 4 ];
 235     t->vec2_ptrs.push_back( tclist );
 236
 237     for ( i = 0; i < 4; ++i ) {
 238         sgSetVec3( vtlist[i],
 239                    rel[i].x(), rel[i].y(), rel[i].z() );
 240         sgSetVec3( vnlist[i],
 241                    normals[i].x(), normals[i].y(), normals[i].z() );
 242         sgSetVec2( tclist[i], texs[i].x(), texs[i].y() );
 243     }
 244
 245     unsigned short *vindex = new unsigned short [ 4 ];
 246     t->index_ptrs.push_back( vindex );
 247     unsigned short *tindex = new unsigned short [ 4 ];
 248     t->index_ptrs.push_back( tindex );
 249     for ( i = 0; i < 4; ++i ) {
 250         vindex[i] = i;
 251         tindex[i] = i;
 252     }
 253
 254     ssgLeaf *leaf =
 255         new ssgVTable ( GL_TRIANGLE_FAN,
 256                         4, vindex, vtlist,
 257                         4, vindex, vnlist,
 258                         4, tindex, tclist,
 259                         0, NULL, NULL ) ;
 260     leaf->setState( state );
 261
 262     tile->addKid( leaf );
 263     // if ( current_options.get_clouds() ) {
 264     //    fgGenCloudTile(path, t, tile);
 265     // }
 266
 267     return tile;
 268 }
 269
 270
 271 // Load a .obj file and build the fragment list
 272 ssgBranch *fgObjLoad( const string& path, FGTileEntry *t) {
 273     fgFRAGMENT fragment;
 274     Point3D pp;
 275     double approx_normal[3] /*, normal[3], scale = 0.0 */;
 276     // double x, y, z, xmax, xmin, ymax, ymin, zmax, zmin;
 277     // GLfloat sgenparams[] = { 1.0, 0.0, 0.0, 0.0 };
 278     // GLint display_list = 0;
 279     int shading;
 280     bool in_fragment = false, in_faces = false;
 281     int vncount, vtcount;
 282     int n1 = 0, n2 = 0, n3 = 0, n4 = 0;
 283     int tex;
 284     int last1 = 0, last2 = 0;
 285     bool odd = false;
 286     point_list nodes;
 287     Point3D node;
 288     Point3D center;
 289     double scenery_version = 0.0;
 290     double tex_width = 1000.0, tex_height = 1000.0;
 291     bool shared_done = false;
 292     int_list fan_vertices;
 293     int_list fan_tex_coords;
 294     int i;
 295     ssgSimpleState *state = NULL;
 296     sgVec3 *vtlist, *vnlist;
 297     sgVec2 *tclist;
 298
 299     ssgBranch *tile = new ssgBranch () ;
 300
 301     tile -> setName ( (char *)path.c_str() ) ;
 302
 303     // Attempt to open "path.gz" or "path"
 304     fg_gzifstream in( path );
 305     if ( ! in.is_open() ) {
 306         FG_LOG( FG_TERRAIN, FG_ALERT, "Cannot open file: " << path );
 307         FG_LOG( FG_TERRAIN, FG_ALERT, "default to ocean tile: " << path );
 308
 309         return fgGenTile( path, t );
 310     }
 311
 312     shading = current_options.get_shading();
 313
 314     in_fragment = false;
 315     t->ncount = 0;
 316     vncount = 0;
 317     vtcount = 0;
 318     t->bounding_radius = 0.0;
 319     center = t->center;
 320
 321     StopWatch stopwatch;
 322     stopwatch.start();
 323
 324     // ignore initial comments and blank lines. (priming the pump)
 325     // in >> skipcomment;
 326     // string line;
 327
 328     string token;
 329     char c;
 330
 331 #ifdef __MWERKS__
 332     while ( in.get(c) && c  != '\0' ) {
 333         in.putback(c);
 334 #else
 335     while ( ! in.eof() ) {
 336 #endif
 337
 338 #if defined( MACOS )
 339         in >> ::skipws;
 340 #else
 341         in >> skipws;
 342 #endif
 343
 344         if ( in.get( c ) && c == '#' ) {
 345             // process a comment line
 346
 347             // getline( in, line );
 348             // cout << "comment = " << line << endl;
 349
 350             in >> token;
 351
 352             if ( token == "Version" ) {
 353                 // read scenery versions number
 354                 in >> scenery_version;
 355                 // cout << "scenery_version = " << scenery_version << endl;
 356             } else if ( token == "gbs" ) {
 357                 // reference point (center offset)
 358                 in >> t->center >> t->bounding_radius;
 359                 center = t->center;
 360                 // cout << "center = " << center
 361                 //      << " radius = " << t->bounding_radius << endl;
 362             } else if ( token == "bs" ) {
 363                 // reference point (center offset)
 364                 in >> fragment.center;
 365                 in >> fragment.bounding_radius;
 366
 367                 // cout << "center = " << fragment.center
 368                 //      << " radius = " << fragment.bounding_radius << endl;
 369             } else if ( token == "usemtl" ) {
 370                 // material property specification
 371
 372                 // if first usemtl with shared_done = false, then set
 373                 // shared_done true and build the ssg shared lists
 374                 if ( ! shared_done ) {
 375                     // sanity check
 376                     if ( (int)nodes.size() != vncount ) {
 377                         FG_LOG( FG_TERRAIN, FG_ALERT,
 378                                 "Tile has mismatched nodes and normals: "
 379                                 << path );
 380                         // exit(-1);
 381                     }
 382                     shared_done = true;
 383
 384                     vtlist = new sgVec3 [ nodes.size() ];
 385                     t->vec3_ptrs.push_back( vtlist );
 386                     vnlist = new sgVec3 [ vncount ];
 387                     t->vec3_ptrs.push_back( vnlist );
 388                     tclist = new sgVec2 [ vtcount ];
 389                     t->vec2_ptrs.push_back( tclist );
 390
 391                     for ( i = 0; i < (int)nodes.size(); ++i ) {
 392                         sgSetVec3( vtlist[i],
 393                                    nodes[i][0], nodes[i][1], nodes[i][2] );
 394                     }
 395                     for ( i = 0; i < vncount; ++i ) {
 396                         sgSetVec3( vnlist[i],
 397                                    normals[i][0],
 398                                    normals[i][1],
 399                                    normals[i][2] );
 400                     }
 401                     for ( i = 0; i < vtcount; ++i ) {
 402                         sgSetVec2( tclist[i],
 403                                    tex_coords[i][0],
 404                                    tex_coords[i][1] );
 405                     }
 406                 }
 407
 408                 // series of individual triangles
 409                 // if ( in_faces ) {
 410                 //     xglEnd();
 411                 // }
 412
 413                 // this also signals the start of a new fragment
 414                 if ( in_fragment ) {
 415                     // close out the previous structure and start the next
 416                     // xglEndList();
 417                     // printf("xglEnd(); xglEndList();\n");
 418
 419                     // update fragment
 420                     // fragment.display_list = display_list;
 421
 422                     // push this fragment onto the tile's object list
 423                     t->fragment_list.push_back(fragment);
 424                 } else {
 425                     in_fragment = true;
 426                 }
 427
 428                 // printf("start of fragment (usemtl)\n");
 429
 430                 // display_list = xglGenLists(1);
 431                 // xglNewList(display_list, GL_COMPILE);
 432                 // printf("xglGenLists(); xglNewList();\n");
 433                 in_faces = false;
 434
 435                 // reset the existing face list
 436                 // printf("cleaning a fragment with %d faces\n",
 437                 //        fragment.faces.size());
 438                 fragment.init();
 439
 440                 // scan the material line
 441                 string material;
 442                 in >> material;
 443                 fragment.tile_ptr = t;
 444
 445                 // find this material in the properties list
 446                 if ( ! material_mgr.find( material, fragment.material_ptr )) {
 447                     FG_LOG( FG_TERRAIN, FG_ALERT,
 448                             "Ack! unknown usemtl name = " << material
 449                             << " in " << path );
 450                 }
 451
 452                 // set the texture width and height values for this
 453                 // material
 454                 FGMaterial m = fragment.material_ptr->get_m();
 455                 tex_width = m.get_xsize();
 456                 tex_height = m.get_ysize();
 457                 state = fragment.material_ptr->get_state();
 458                 // cout << "(w) = " << tex_width << " (h) = "
 459                 //      << tex_width << endl;
 460
 461                 // initialize the fragment transformation matrix
 462                 /*
 463                  for ( i = 0; i < 16; i++ ) {
 464                    fragment.matrix[i] = 0.0;
 465                  }
 466                  fragment.matrix[0] = fragment.matrix[5] =
 467                  fragment.matrix[10] = fragment.matrix[15] = 1.0;
 468                 */
 469             } else {
 470                 // unknown comment, just gobble the input untill the
 471                 // end of line
 472
 473                 in >> skipeol;
 474             }
 475         } else {
 476             in.putback( c );
 477
 478             in >> token;
 479
 480             // cout << "token = " << token << endl;
 481
 482             if ( token == "vn" ) {
 483                 // vertex normal
 484                 if ( vncount < FG_MAX_NODES ) {
 485                     in >> normals[vncount][0]
 486                        >> normals[vncount][1]
 487                        >> normals[vncount][2];
 488                     vncount++;
 489                 } else {
 490                     FG_LOG( FG_TERRAIN, FG_ALERT,
 491                             "Read too many vertex normals in " << path
 492                             << " ... dying :-(" );
 493                     exit(-1);
 494                 }
 495             } else if ( token == "vt" ) {
 496                 // vertex texture coordinate
 497                 if ( vtcount < FG_MAX_NODES*3 ) {
 498                     in >> tex_coords[vtcount][0]
 499                        >> tex_coords[vtcount][1];
 500                     vtcount++;
 501                 } else {
 502                     FG_LOG( FG_TERRAIN, FG_ALERT,
 503                             "Read too many vertex texture coords in " << path
 504                             << " ... dying :-("
 505                             );
 506                     exit(-1);
 507                 }
 508             } else if ( token == "v" ) {
 509                 // node (vertex)
 510                 if ( t->ncount < FG_MAX_NODES ) {
 511                     /* in >> nodes[t->ncount][0]
 512                        >> nodes[t->ncount][1]
 513                        >> nodes[t->ncount][2]; */
 514                     in >> node;
 515                     nodes.push_back(node);
 516                     t->ncount++;
 517                 } else {
 518                     FG_LOG( FG_TERRAIN, FG_ALERT,
 519                             "Read too many nodes in " << path
 520                             << " ... dying :-(");
 521                     exit(-1);
 522                 }
 523             } else if ( token == "t" ) {
 524                 // start a new triangle strip
 525
 526                 n1 = n2 = n3 = n4 = 0;
 527
 528                 // fgPrintf( FG_TERRAIN, FG_DEBUG,
 529                 //           "    new tri strip = %s", line);
 530                 in >> n1 >> n2 >> n3;
 531                 fragment.add_face(n1, n2, n3);
 532
 533                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "(t) = ");
 534
 535                 // xglBegin(GL_TRIANGLE_STRIP);
 536                 // printf("xglBegin(tristrip) %d %d %d\n", n1, n2, n3);
 537
 538                 odd = true;
 539                 // scale = 1.0;
 540
 541                 if ( shading ) {
 542                     // Shading model is "GL_SMOOTH" so use precalculated
 543                     // (averaged) normals
 544                     // MAT3_SCALE_VEC(normal, normals[n1], scale);
 545                     // xglNormal3dv(normal);
 546                     pp = local_calc_tex_coords(nodes[n1], center);
 547                     // xglTexCoord2f(pp.lon(), pp.lat());
 548                     // xglVertex3dv(nodes[n1].get_n());
 549
 550                     // MAT3_SCALE_VEC(normal, normals[n2], scale);
 551                     // xglNormal3dv(normal);
 552                     pp = local_calc_tex_coords(nodes[n2], center);
 553                     // xglTexCoord2f(pp.lon(), pp.lat());
 554                     // xglVertex3dv(nodes[n2].get_n());
 555
 556                     // MAT3_SCALE_VEC(normal, normals[n3], scale);
 557                     // xglNormal3dv(normal);
 558                     pp = local_calc_tex_coords(nodes[n3], center);
 559                     // xglTexCoord2f(pp.lon(), pp.lat());
 560                     // xglVertex3dv(nodes[n3].get_n());
 561                 } else {
 562                     // Shading model is "GL_FLAT" so calculate per face
 563                     // normals on the fly.
 564                     if ( odd ) {
 565                         calc_normal(nodes[n1], nodes[n2],
 566                                     nodes[n3], approx_normal);
 567                     } else {
 568                         calc_normal(nodes[n2], nodes[n1],
 569                                     nodes[n3], approx_normal);
 570                     }
 571                     // MAT3_SCALE_VEC(normal, approx_normal, scale);
 572                     // xglNormal3dv(normal);
 573
 574                     pp = local_calc_tex_coords(nodes[n1], center);
 575                     // xglTexCoord2f(pp.lon(), pp.lat());
 576                     // xglVertex3dv(nodes[n1].get_n());
 577
 578                     pp = local_calc_tex_coords(nodes[n2], center);
 579                     // xglTexCoord2f(pp.lon(), pp.lat());
 580                     // xglVertex3dv(nodes[n2].get_n());
 581
 582                     pp = local_calc_tex_coords(nodes[n3], center);
 583                     // xglTexCoord2f(pp.lon(), pp.lat());
 584                     // xglVertex3dv(nodes[n3].get_n());
 585                 }
 586                 // printf("some normals, texcoords, and vertices\n");
 587
 588                 odd = !odd;
 589                 last1 = n2;
 590                 last2 = n3;
 591
 592                 // There can be three or four values
 593                 char c;
 594                 while ( in.get(c) ) {
 595                     if ( c == '\n' ) {
 596                         break; // only the one
 597                     }
 598                     if ( isdigit(c) ){
 599                         in.putback(c);
 600                         in >> n4;
 601                         break;
 602                     }
 603                 }
 604
 605                 if ( n4 > 0 ) {
 606                     fragment.add_face(n3, n2, n4);
 607
 608                     if ( shading ) {
 609                         // Shading model is "GL_SMOOTH"
 610                         // MAT3_SCALE_VEC(normal, normals[n4], scale);
 611                     } else {
 612                         // Shading model is "GL_FLAT"
 613                         calc_normal(nodes[n3], nodes[n2], nodes[n4],
 614                                     approx_normal);
 615                         // MAT3_SCALE_VEC(normal, approx_normal, scale);
 616                     }
 617                     // xglNormal3dv(normal);
 618                     pp = local_calc_tex_coords(nodes[n4], center);
 619                     // xglTexCoord2f(pp.lon(), pp.lat());
 620                     // xglVertex3dv(nodes[n4].get_n());
 621
 622                     odd = !odd;
 623                     last1 = n3;
 624                     last2 = n4;
 625                     // printf("a normal, texcoord, and vertex (4th)\n");
 626                 }
 627             } else if ( (token == "tf") || (token == "ts") ) {
 628                 // triangle fan
 629                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "new fan");
 630
 631                 fan_vertices.clear();
 632                 fan_tex_coords.clear();
 633                 odd = true;
 634
 635                 // xglBegin(GL_TRIANGLE_FAN);
 636
 637                 in >> n1;
 638                 fan_vertices.push_back( n1 );
 639                 // xglNormal3dv(normals[n1]);
 640                 if ( in.get( c ) && c == '/' ) {
 641                     in >> tex;
 642                     fan_tex_coords.push_back( tex );
 643                     if ( scenery_version >= 0.4 ) {
 644                         if ( tex_width > 0 ) {
 645                             tclist[tex][0] *= (1000.0 / tex_width);
 646                         }
 647                         if ( tex_height > 0 ) {
 648                             tclist[tex][1] *= (1000.0 / tex_height);
 649                         }
 650                     }
 651                     pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 652                     pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 653                 } else {
 654                     in.putback( c );
 655                     pp = local_calc_tex_coords(nodes[n1], center);
 656                 }
 657                 // xglTexCoord2f(pp.x(), pp.y());
 658                 // xglVertex3dv(nodes[n1].get_n());
 659
 660                 in >> n2;
 661                 fan_vertices.push_back( n2 );
 662                 // xglNormal3dv(normals[n2]);
 663                 if ( in.get( c ) && c == '/' ) {
 664                     in >> tex;
 665                     fan_tex_coords.push_back( tex );
 666                     if ( scenery_version >= 0.4 ) {
 667                         if ( tex_width > 0 ) {
 668                             tclist[tex][0] *= (1000.0 / tex_width);
 669                         }
 670                         if ( tex_height > 0 ) {
 671                             tclist[tex][1] *= (1000.0 / tex_height);
 672                         }
 673                     }
 674                     pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 675                     pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 676                 } else {
 677                     in.putback( c );
 678                     pp = local_calc_tex_coords(nodes[n2], center);
 679                 }
 680                 // xglTexCoord2f(pp.x(), pp.y());
 681                 // xglVertex3dv(nodes[n2].get_n());
 682
 683                 // read all subsequent numbers until next thing isn't a number
 684                 while ( true ) {
 685 #if defined( MACOS )
 686                     in >> ::skipws;
 687 #else
 688                     in >> skipws;
 689 #endif
 690
 691                     char c;
 692                     in.get(c);
 693                     in.putback(c);
 694                     if ( ! isdigit(c) || in.eof() ) {
 695                         break;
 696                     }
 697
 698                     in >> n3;
 699                     fan_vertices.push_back( n3 );
 700                     // cout << "  triangle = "
 701                     //      << n1 << "," << n2 << "," << n3
 702                     //      << endl;
 703                     // xglNormal3dv(normals[n3]);
 704                     if ( in.get( c ) && c == '/' ) {
 705                         in >> tex;
 706                         fan_tex_coords.push_back( tex );
 707                         if ( scenery_version >= 0.4 ) {
 708                             if ( tex_width > 0 ) {
 709                                 tclist[tex][0] *= (1000.0 / tex_width);
 710                             }
 711                             if ( tex_height > 0 ) {
 712                                 tclist[tex][1] *= (1000.0 / tex_height);
 713                             }
 714                         }
 715                         pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 716                         pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 717                     } else {
 718                         in.putback( c );
 719                         pp = local_calc_tex_coords(nodes[n3], center);
 720                     }
 721                     // xglTexCoord2f(pp.x(), pp.y());
 722                     // xglVertex3dv(nodes[n3].get_n());
 723
 724                     if ( token == "tf" ) {
 725                         // triangle fan
 726                         fragment.add_face(n1, n2, n3);
 727                         n2 = n3;
 728                     } else {
 729                         // triangle strip
 730                         if ( odd ) {
 731                             fragment.add_face(n1, n2, n3);
 732                         } else {
 733                             fragment.add_face(n2, n1, n3);
 734                         }
 735                         odd = !odd;
 736                         n1 = n2;
 737                         n2 = n3;
 738                     }
 739                 }
 740
 741                 // xglEnd();
 742
 743                 // build the ssg entity
 744                 unsigned short *vindex =
 745                     new unsigned short [ fan_vertices.size() ];
 746                 t->index_ptrs.push_back( vindex );
 747
 748                 unsigned short *tindex =
 749                     new unsigned short [ fan_tex_coords.size() ];
 750                 t->index_ptrs.push_back( tindex );
 751
 752                 for ( i = 0; i < (int)fan_vertices.size(); ++i ) {
 753                     vindex[i] = fan_vertices[i];
 754                 }
 755                 for ( i = 0; i < (int)fan_tex_coords.size(); ++i ) {
 756                     tindex[i] = fan_tex_coords[i];
 757                 }
 758                 ssgLeaf *leaf;
 759                 if ( token == "tf" ) {
 760                     // triangle fan
 761                     leaf =
 762                         new ssgVTable ( GL_TRIANGLE_FAN,
 763                                         fan_vertices.size(), vindex, vtlist,
 764                                         fan_vertices.size(), vindex, vnlist,
 765                                         fan_tex_coords.size(), tindex, tclist,
 766                                         0, NULL, NULL ) ;
 767                 } else {
 768                     // triangle strip
 769                     leaf =
 770                         new ssgVTable ( GL_TRIANGLE_STRIP,
 771                                         fan_vertices.size(), vindex, vtlist,
 772                                         fan_vertices.size(), vindex, vnlist,
 773                                         fan_tex_coords.size(), tindex, tclist,
 774                                         0, NULL, NULL ) ;
 775                 }
 776                 leaf->setState( state );
 777
 778                 tile->addKid( leaf );
 779
 780             } else if ( token == "f" ) {
 781                 // unoptimized face
 782
 783                 if ( !in_faces ) {
 784                     // xglBegin(GL_TRIANGLES);
 785                     // printf("xglBegin(triangles)\n");
 786                     in_faces = true;
 787                 }
 788
 789                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "new triangle = %s", line);*/
 790                 in >> n1 >> n2 >> n3;
 791                 fragment.add_face(n1, n2, n3);
 792
 793                 // xglNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
 794                 // xglNormal3dv(normals[n1]);
 795                 pp = local_calc_tex_coords(nodes[n1], center);
 796                 // xglTexCoord2f(pp.lon(), pp.lat());
 797                 // xglVertex3dv(nodes[n1].get_n());
 798
 799                 // xglNormal3dv(normals[n2]);
 800                 pp = local_calc_tex_coords(nodes[n2], center);
 801                 // xglTexCoord2f(pp.lon(), pp.lat());
 802                 // xglVertex3dv(nodes[n2].get_n());
 803
 804                 // xglNormal3dv(normals[n3]);
 805                 pp = local_calc_tex_coords(nodes[n3], center);
 806                 // xglTexCoord2f(pp.lon(), pp.lat());
 807                 // xglVertex3dv(nodes[n3].get_n());
 808                 // printf("some normals, texcoords, and vertices (tris)\n");
 809             } else if ( token == "q" ) {
 810                 // continue a triangle strip
 811                 n1 = n2 = 0;
 812
 813                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "continued tri strip = %s ",
 814                 //           line);
 815                 in >> n1;
 816
 817                 // There can be one or two values
 818                 char c;
 819                 while ( in.get(c) ) {
 820                     if ( c == '\n' ) {
 821                         break; // only the one
 822                     }
 823
 824                     if ( isdigit(c) ) {
 825                         in.putback(c);
 826                         in >> n2;
 827                         break;
 828                     }
 829                 }
 830                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "read %d %d\n", n1, n2);
 831
 832                 if ( odd ) {
 833                     fragment.add_face(last1, last2, n1);
 834                 } else {
 835                     fragment.add_face(last2, last1, n1);
 836                 }
 837
 838                 if ( shading ) {
 839                     // Shading model is "GL_SMOOTH"
 840                     // MAT3_SCALE_VEC(normal, normals[n1], scale);
 841                 } else {
 842                     // Shading model is "GL_FLAT"
 843                     if ( odd ) {
 844                         calc_normal(nodes[last1], nodes[last2],
 845                                     nodes[n1], approx_normal);
 846                     } else {
 847                         calc_normal(nodes[last2], nodes[last1],
 848                                     nodes[n1], approx_normal);
 849                     }
 850                     // MAT3_SCALE_VEC(normal, approx_normal, scale);
 851                 }
 852                 // xglNormal3dv(normal);
 853
 854                 pp = local_calc_tex_coords(nodes[n1], center);
 855                 // xglTexCoord2f(pp.lon(), pp.lat());
 856                 // xglVertex3dv(nodes[n1].get_n());
 857                 // printf("a normal, texcoord, and vertex (4th)\n");
 858
 859                 odd = !odd;
 860                 last1 = last2;
 861                 last2 = n1;
 862
 863                 if ( n2 > 0 ) {
 864                     // fgPrintf( FG_TERRAIN, FG_DEBUG, " (cont)\n");
 865
 866                     if ( odd ) {
 867                         fragment.add_face(last1, last2, n2);
 868                     } else {
 869                         fragment.add_face(last2, last1, n2);
 870                     }
 871
 872                     if ( shading ) {
 873                         // Shading model is "GL_SMOOTH"
 874                         // MAT3_SCALE_VEC(normal, normals[n2], scale);
 875                     } else {
 876                         // Shading model is "GL_FLAT"
 877                         if ( odd ) {
 878                             calc_normal(nodes[last1], nodes[last2],
 879                                         nodes[n2], approx_normal);
 880                         } else {
 881                             calc_normal(nodes[last2], nodes[last1],
 882                                         nodes[n2], approx_normal);
 883                         }
 884                         // MAT3_SCALE_VEC(normal, approx_normal, scale);
 885                     }
 886                     // xglNormal3dv(normal);
 887
 888                     pp = local_calc_tex_coords(nodes[n2], center);
 889                     // xglTexCoord2f(pp.lon(), pp.lat());
 890                     // xglVertex3dv(nodes[n2].get_n());
 891                     // printf("a normal, texcoord, and vertex (4th)\n");
 892
 893                     odd = !odd;
 894                     last1 = last2;
 895                     last2 = n2;
 896                 }
 897             } else {
 898                 FG_LOG( FG_TERRAIN, FG_WARN, "Unknown token in "
 899                         << path << " = " << token );
 900             }
 901
 902             // eat white space before start of while loop so if we are
 903             // done with useful input it is noticed before hand.
 904 #if defined( MACOS )
 905             in >> ::skipws;
 906 #else
 907             in >> skipws;
 908 #endif
 909         }
 910     }
 911
 912     if ( in_fragment ) {
 913         // close out the previous structure and start the next
 914         // xglEnd();
 915         // xglEndList();
 916         // printf("xglEnd(); xglEndList();\n");
 917
 918         // update fragment
 919         // fragment.display_list = display_list;
 920
 921         // push this fragment onto the tile's object list
 922         t->fragment_list.push_back(fragment);
 923     }
 924
 925 #if 0
 926     // Draw normal vectors (for visually verifying normals)
 927     xglBegin(GL_LINES);
 928     xglColor3f(0.0, 0.0, 0.0);
 929     for ( i = 0; i < t->ncount; i++ ) {
 930         xglVertex3d(nodes[i][0],
 931                     nodes[i][1] ,
 932                     nodes[i][2]);
 933         xglVertex3d(nodes[i][0] + 500*normals[i][0],
 934                     nodes[i][1] + 500*normals[i][1],
 935                     nodes[i][2] + 500*normals[i][2]);
 936     }
 937     xglEnd();
 938 #endif
 939
 940     t->nodes = nodes;
 941
 942     stopwatch.stop();
 943     FG_LOG( FG_TERRAIN, FG_DEBUG,
 944             "Loaded " << path << " in "
 945             << stopwatch.elapsedSeconds() << " seconds" );
 946
 947     // Generate a cloud layer above the tiles
 948     // if ( current_options.get_clouds() ) {
 949     //          fgGenCloudTile(path, t, tile);
 950     // }
 951     return tile;
 952 }
 953
 954