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