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
  59 #include "materialmgr.hxx"
  60 #include "obj.hxx"
  61
  62 FG_USING_STD(string);
  63 FG_USING_STD(vector);
  64
  65
  66 typedef vector < int > int_list;
  67 typedef int_list::iterator int_list_iterator;
  68 typedef int_list::const_iterator int_point_list_iterator;
  69
  70
  71 static double normals[FG_MAX_NODES][3];
  72 static double tex_coords[FG_MAX_NODES*3][3];
  73
  74
  75 // given three points defining a triangle, calculate the normal
  76 static void calc_normal(Point3D p1, Point3D p2,
  77                         Point3D p3, double normal[3])
  78 {
  79     double v1[3], v2[3];
  80     double temp;
  81
  82     v1[0] = p2[0] - p1[0]; v1[1] = p2[1] - p1[1]; v1[2] = p2[2] - p1[2];
  83     v2[0] = p3[0] - p1[0]; v2[1] = p3[1] - p1[1]; v2[2] = p3[2] - p1[2];
  84
  85     MAT3cross_product(normal, v1, v2);
  86     MAT3_NORMALIZE_VEC(normal,temp);
  87
  88     // fgPrintf( FG_TERRAIN, FG_DEBUG, "  Normal = %.2f %.2f %.2f\n",
  89     //           normal[0], normal[1], normal[2]);
  90 }
  91
  92
  93 #define FG_TEX_CONSTANT 69.0
  94
  95
  96 // Calculate texture coordinates for a given point.
  97 static Point3D 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     Point3D texs[4];
 212     for ( i = 0; i < 4; ++i ) {
 213         texs[i] = calc_tex_coords( rel[i], center );
 214         // cout << "texture coordinate = " << texs[i] << endl;
 215     }
 216
 217     // Build flight gear structure
 218     fragment.add_face(0, 1, 2);
 219     fragment.add_face(0, 2, 3);
 220     t->fragment_list.push_back(fragment);
 221
 222     // Build ssg structure
 223     t->vtlist = new sgVec3 [ 4 ];
 224     t->vnlist = new sgVec3 [ 4 ];
 225     t->tclist = new sgVec2 [ 4 ];
 226
 227     for ( i = 0; i < 4; ++i ) {
 228         sgSetVec3( t->vtlist[i],
 229                    rel[i].x(), rel[i].y(), rel[i].z() );
 230         sgSetVec3( t->vnlist[i],
 231                    normals[i].x(), normals[i].y(), normals[i].z() );
 232         sgSetVec2( t->tclist[i], texs[i].x(), texs[i].y() );
 233     }
 234
 235     unsigned short *vindex = new unsigned short [ 4 ];
 236     unsigned short *tindex = new unsigned short [ 4 ];
 237     for ( i = 0; i < 4; ++i ) {
 238         vindex[i] = i;
 239         tindex[i] = i;
 240     }
 241
 242     ssgLeaf *leaf =
 243         new ssgVTable ( GL_TRIANGLE_FAN,
 244                         4, vindex, t->vtlist,
 245                         4, vindex, t->vnlist,
 246                         4, tindex, t->tclist,
 247                         0, NULL, NULL ) ;
 248     leaf->setState( state );
 249
 250     tile->addKid( leaf );
 251
 252     return tile;
 253 }
 254
 255
 256 // Load a .obj file and build the fragment list
 257 ssgBranch *fgObjLoad( const string& path, FGTileEntry *t) {
 258     fgFRAGMENT fragment;
 259     Point3D pp;
 260     double approx_normal[3] /*, normal[3], scale = 0.0 */;
 261     // double x, y, z, xmax, xmin, ymax, ymin, zmax, zmin;
 262     // GLfloat sgenparams[] = { 1.0, 0.0, 0.0, 0.0 };
 263     // GLint display_list = 0;
 264     int shading;
 265     bool in_fragment = false, in_faces = false;
 266     int vncount, vtcount;
 267     int n1 = 0, n2 = 0, n3 = 0, n4 = 0;
 268     int tex;
 269     int last1 = 0, last2 = 0, odd = 0;
 270     point_list nodes;
 271     Point3D node;
 272     Point3D center;
 273     double scenery_version = 0.0;
 274     double tex_width = 1000.0, tex_height = 1000.0;
 275     bool shared_done = false;
 276     int_list fan_vertices;
 277     int_list fan_tex_coords;
 278     int i;
 279     ssgSimpleState *state = NULL;
 280
 281     ssgBranch *tile = new ssgBranch () ;
 282     tile -> setName ( (char *)path.c_str() ) ;
 283
 284     // Attempt to open "path.gz" or "path"
 285     fg_gzifstream in( path );
 286     if ( ! in.is_open() ) {
 287         FG_LOG( FG_TERRAIN, FG_ALERT, "Cannot open file: " << path );
 288         FG_LOG( FG_TERRAIN, FG_ALERT, "default to ocean tile: " << path );
 289
 290         return fgGenTile( path, t );
 291     }
 292
 293     shading = current_options.get_shading();
 294
 295     in_fragment = false;
 296     t->ncount = 0;
 297     vncount = 0;
 298     vtcount = 0;
 299     t->bounding_radius = 0.0;
 300     center = t->center;
 301
 302     StopWatch stopwatch;
 303     stopwatch.start();
 304
 305     // ignore initial comments and blank lines. (priming the pump)
 306     // in >> skipcomment;
 307     // string line;
 308
 309     string token;
 310     char c;
 311
 312 #ifdef __MWERKS__
 313     while ( in.get(c) && c  != '\0' ) {
 314         in.putback(c);
 315 #else
 316     while ( ! in.eof() ) {
 317 #endif
 318
 319 #if defined( MACOS )
 320         in >> ::skipws;
 321 #else
 322         in >> skipws;
 323 #endif
 324
 325         if ( in.get( c ) && c == '#' ) {
 326             // process a comment line
 327
 328             // getline( in, line );
 329             // cout << "comment = " << line << endl;
 330
 331             in >> token;
 332
 333             if ( token == "version" ) {
 334                 // read scenery versions number
 335                 in >> scenery_version;
 336                 // cout << "scenery_version = " << scenery_version << endl;
 337             } else if ( token == "gbs" ) {
 338                 // reference point (center offset)
 339                 in >> t->center >> t->bounding_radius;
 340                 center = t->center;
 341                 // cout << "center = " << center
 342                 //      << " radius = " << t->bounding_radius << endl;
 343             } else if ( token == "bs" ) {
 344                 // reference point (center offset)
 345                 in >> fragment.center;
 346                 in >> fragment.bounding_radius;
 347
 348                 // cout << "center = " << fragment.center
 349                 //      << " radius = " << fragment.bounding_radius << endl;
 350             } else if ( token == "usemtl" ) {
 351                 // material property specification
 352
 353                 // if first usemtl with shared_done = false, then set
 354                 // shared_done true and build the ssg shared lists
 355                 if ( ! shared_done ) {
 356                     // sanity check
 357                     if ( (int)nodes.size() != vncount ) {
 358                         FG_LOG( FG_TERRAIN, FG_ALERT,
 359                                 "Tile has mismatched nodes and normals: "
 360                                 << path );
 361                         // exit(-1);
 362                     }
 363                     shared_done = true;
 364
 365                     t->vtlist = new sgVec3 [ nodes.size() ];
 366                     t->vnlist = new sgVec3 [ vncount ];
 367                     t->tclist = new sgVec2 [ vtcount ];
 368
 369                     for ( i = 0; i < (int)nodes.size(); ++i ) {
 370                         sgSetVec3( t->vtlist[i],
 371                                    nodes[i][0], nodes[i][1], nodes[i][2] );
 372                     }
 373                     for ( i = 0; i < vncount; ++i ) {
 374                         sgSetVec3( t->vnlist[i],
 375                                    normals[i][0],
 376                                    normals[i][1],
 377                                    normals[i][2] );
 378                     }
 379                     for ( i = 0; i < vtcount; ++i ) {
 380                         sgSetVec2( t->tclist[i],
 381                                    tex_coords[i][0],
 382                                    tex_coords[i][1] );
 383                     }
 384                 }
 385
 386                 // series of individual triangles
 387                 // if ( in_faces ) {
 388                 //     xglEnd();
 389                 // }
 390
 391                 // this also signals the start of a new fragment
 392                 if ( in_fragment ) {
 393                     // close out the previous structure and start the next
 394                     // xglEndList();
 395                     // printf("xglEnd(); xglEndList();\n");
 396
 397                     // update fragment
 398                     // fragment.display_list = display_list;
 399
 400                     // push this fragment onto the tile's object list
 401                     t->fragment_list.push_back(fragment);
 402                 } else {
 403                     in_fragment = true;
 404                 }
 405
 406                 // printf("start of fragment (usemtl)\n");
 407
 408                 // display_list = xglGenLists(1);
 409                 // xglNewList(display_list, GL_COMPILE);
 410                 // printf("xglGenLists(); xglNewList();\n");
 411                 in_faces = false;
 412
 413                 // reset the existing face list
 414                 // printf("cleaning a fragment with %d faces\n",
 415                 //        fragment.faces.size());
 416                 fragment.init();
 417
 418                 // scan the material line
 419                 string material;
 420                 in >> material;
 421                 fragment.tile_ptr = t;
 422
 423                 // find this material in the properties list
 424                 if ( ! material_mgr.find( material, fragment.material_ptr )) {
 425                     FG_LOG( FG_TERRAIN, FG_ALERT,
 426                             "Ack! unknown usemtl name = " << material
 427                             << " in " << path );
 428                 }
 429
 430                 // set the texture width and height values for this
 431                 // material
 432                 FGMaterial m = fragment.material_ptr->get_m();
 433                 tex_width = m.get_xsize();
 434                 tex_height = m.get_ysize();
 435                 state = fragment.material_ptr->get_state();
 436                 // cout << "(w) = " << tex_width << " (h) = "
 437                 //      << tex_width << endl;
 438
 439                 // initialize the fragment transformation matrix
 440                 /*
 441                  for ( i = 0; i < 16; i++ ) {
 442                    fragment.matrix[i] = 0.0;
 443                  }
 444                  fragment.matrix[0] = fragment.matrix[5] =
 445                  fragment.matrix[10] = fragment.matrix[15] = 1.0;
 446                 */
 447             } else {
 448                 // unknown comment, just gobble the input untill the
 449                 // end of line
 450
 451                 in >> skipeol;
 452             }
 453         } else {
 454             in.putback( c );
 455
 456             in >> token;
 457
 458             // cout << "token = " << token << endl;
 459
 460             if ( token == "vn" ) {
 461                 // vertex normal
 462                 if ( vncount < FG_MAX_NODES ) {
 463                     in >> normals[vncount][0]
 464                        >> normals[vncount][1]
 465                        >> normals[vncount][2];
 466                     vncount++;
 467                 } else {
 468                     FG_LOG( FG_TERRAIN, FG_ALERT,
 469                             "Read too many vertex normals in " << path
 470                             << " ... dying :-(" );
 471                     exit(-1);
 472                 }
 473             } else if ( token == "vt" ) {
 474                 // vertex texture coordinate
 475                 if ( vtcount < FG_MAX_NODES*3 ) {
 476                     in >> tex_coords[vtcount][0]
 477                        >> tex_coords[vtcount][1];
 478                     vtcount++;
 479                 } else {
 480                     FG_LOG( FG_TERRAIN, FG_ALERT,
 481                             "Read too many vertex texture coords in " << path
 482                             << " ... dying :-("
 483                             );
 484                     exit(-1);
 485                 }
 486             } else if ( token == "v" ) {
 487                 // node (vertex)
 488                 if ( t->ncount < FG_MAX_NODES ) {
 489                     /* in >> nodes[t->ncount][0]
 490                        >> nodes[t->ncount][1]
 491                        >> nodes[t->ncount][2]; */
 492                     in >> node;
 493                     nodes.push_back(node);
 494                     t->ncount++;
 495                 } else {
 496                     FG_LOG( FG_TERRAIN, FG_ALERT,
 497                             "Read too many nodes in " << path
 498                             << " ... dying :-(");
 499                     exit(-1);
 500                 }
 501             } else if ( token == "t" ) {
 502                 // start a new triangle strip
 503
 504                 n1 = n2 = n3 = n4 = 0;
 505
 506                 // fgPrintf( FG_TERRAIN, FG_DEBUG,
 507                 //           "    new tri strip = %s", line);
 508                 in >> n1 >> n2 >> n3;
 509                 fragment.add_face(n1, n2, n3);
 510
 511                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "(t) = ");
 512
 513                 // xglBegin(GL_TRIANGLE_STRIP);
 514                 // printf("xglBegin(tristrip) %d %d %d\n", n1, n2, n3);
 515
 516                 odd = 1;
 517                 // scale = 1.0;
 518
 519                 if ( shading ) {
 520                     // Shading model is "GL_SMOOTH" so use precalculated
 521                     // (averaged) normals
 522                     // MAT3_SCALE_VEC(normal, normals[n1], scale);
 523                     // xglNormal3dv(normal);
 524                     pp = calc_tex_coords(nodes[n1], center);
 525                     // xglTexCoord2f(pp.lon(), pp.lat());
 526                     // xglVertex3dv(nodes[n1].get_n());
 527
 528                     // MAT3_SCALE_VEC(normal, normals[n2], scale);
 529                     // xglNormal3dv(normal);
 530                     pp = calc_tex_coords(nodes[n2], center);
 531                     // xglTexCoord2f(pp.lon(), pp.lat());
 532                     // xglVertex3dv(nodes[n2].get_n());
 533
 534                     // MAT3_SCALE_VEC(normal, normals[n3], scale);
 535                     // xglNormal3dv(normal);
 536                     pp = calc_tex_coords(nodes[n3], center);
 537                     // xglTexCoord2f(pp.lon(), pp.lat());
 538                     // xglVertex3dv(nodes[n3].get_n());
 539                 } else {
 540                     // Shading model is "GL_FLAT" so calculate per face
 541                     // normals on the fly.
 542                     if ( odd ) {
 543                         calc_normal(nodes[n1], nodes[n2],
 544                                     nodes[n3], approx_normal);
 545                     } else {
 546                         calc_normal(nodes[n2], nodes[n1],
 547                                     nodes[n3], approx_normal);
 548                     }
 549                     // MAT3_SCALE_VEC(normal, approx_normal, scale);
 550                     // xglNormal3dv(normal);
 551
 552                     pp = calc_tex_coords(nodes[n1], center);
 553                     // xglTexCoord2f(pp.lon(), pp.lat());
 554                     // xglVertex3dv(nodes[n1].get_n());
 555
 556                     pp = calc_tex_coords(nodes[n2], center);
 557                     // xglTexCoord2f(pp.lon(), pp.lat());
 558                     // xglVertex3dv(nodes[n2].get_n());
 559
 560                     pp = calc_tex_coords(nodes[n3], center);
 561                     // xglTexCoord2f(pp.lon(), pp.lat());
 562                     // xglVertex3dv(nodes[n3].get_n());
 563                 }
 564                 // printf("some normals, texcoords, and vertices\n");
 565
 566                 odd = 1 - odd;
 567                 last1 = n2;
 568                 last2 = n3;
 569
 570                 // There can be three or four values
 571                 char c;
 572                 while ( in.get(c) ) {
 573                     if ( c == '\n' ) {
 574                         break; // only the one
 575                     }
 576                     if ( isdigit(c) ){
 577                         in.putback(c);
 578                         in >> n4;
 579                         break;
 580                     }
 581                 }
 582
 583                 if ( n4 > 0 ) {
 584                     fragment.add_face(n3, n2, n4);
 585
 586                     if ( shading ) {
 587                         // Shading model is "GL_SMOOTH"
 588                         // MAT3_SCALE_VEC(normal, normals[n4], scale);
 589                     } else {
 590                         // Shading model is "GL_FLAT"
 591                         calc_normal(nodes[n3], nodes[n2], nodes[n4],
 592                                     approx_normal);
 593                         // MAT3_SCALE_VEC(normal, approx_normal, scale);
 594                     }
 595                     // xglNormal3dv(normal);
 596                     pp = calc_tex_coords(nodes[n4], center);
 597                     // xglTexCoord2f(pp.lon(), pp.lat());
 598                     // xglVertex3dv(nodes[n4].get_n());
 599
 600                     odd = 1 - odd;
 601                     last1 = n3;
 602                     last2 = n4;
 603                     // printf("a normal, texcoord, and vertex (4th)\n");
 604                 }
 605             } else if ( token == "tf" ) {
 606                 // triangle fan
 607                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "new fan");
 608
 609                 fan_vertices.clear();
 610                 fan_tex_coords.clear();
 611
 612                 // xglBegin(GL_TRIANGLE_FAN);
 613
 614                 in >> n1;
 615                 fan_vertices.push_back( n1 );
 616                 // xglNormal3dv(normals[n1]);
 617                 if ( in.get( c ) && c == '/' ) {
 618                     in >> tex;
 619                     fan_tex_coords.push_back( tex );
 620                     if ( scenery_version >= 0.4 ) {
 621                         t->tclist[tex][0] *= (1000.0 / tex_width);
 622                         t->tclist[tex][1] *= (1000.0 / tex_height);
 623                     }
 624                     pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 625                     pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 626                 } else {
 627                     in.putback( c );
 628                     pp = calc_tex_coords(nodes[n1], center);
 629                 }
 630                 // xglTexCoord2f(pp.x(), pp.y());
 631                 // xglVertex3dv(nodes[n1].get_n());
 632
 633                 in >> n2;
 634                 fan_vertices.push_back( n2 );
 635                 // xglNormal3dv(normals[n2]);
 636                 if ( in.get( c ) && c == '/' ) {
 637                     in >> tex;
 638                     fan_tex_coords.push_back( tex );
 639                     if ( scenery_version >= 0.4 ) {
 640                         t->tclist[tex][0] *= (1000.0 / tex_width);
 641                         t->tclist[tex][1] *= (1000.0 / tex_height);
 642                     }
 643                     pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 644                     pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 645                 } else {
 646                     in.putback( c );
 647                     pp = calc_tex_coords(nodes[n2], center);
 648                 }
 649                 // xglTexCoord2f(pp.x(), pp.y());
 650                 // xglVertex3dv(nodes[n2].get_n());
 651
 652                 // read all subsequent numbers until next thing isn't a number
 653                 while ( true ) {
 654 #if defined( MACOS )
 655                     in >> ::skipws;
 656 #else
 657                     in >> skipws;
 658 #endif
 659
 660                     char c;
 661                     in.get(c);
 662                     in.putback(c);
 663                     if ( ! isdigit(c) || in.eof() ) {
 664                         break;
 665                     }
 666
 667                     in >> n3;
 668                     fan_vertices.push_back( n3 );
 669                     // cout << "  triangle = "
 670                     //      << n1 << "," << n2 << "," << n3
 671                     //      << endl;
 672                     // xglNormal3dv(normals[n3]);
 673                     if ( in.get( c ) && c == '/' ) {
 674                         in >> tex;
 675                         fan_tex_coords.push_back( tex );
 676                         if ( scenery_version >= 0.4 ) {
 677                             t->tclist[tex][0] *= (1000.0 / tex_width);
 678                             t->tclist[tex][1] *= (1000.0 / tex_height);
 679                         }
 680                         pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 681                         pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 682                     } else {
 683                         in.putback( c );
 684                         pp = calc_tex_coords(nodes[n3], center);
 685                     }
 686                     // xglTexCoord2f(pp.x(), pp.y());
 687                     // xglVertex3dv(nodes[n3].get_n());
 688
 689                     fragment.add_face(n1, n2, n3);
 690                     n2 = n3;
 691                 }
 692
 693                 // xglEnd();
 694
 695                 // build the ssg entity
 696                 unsigned short *vindex =
 697                     new unsigned short [ fan_vertices.size() ];
 698                 unsigned short *tindex =
 699                     new unsigned short [ fan_tex_coords.size() ];
 700                 for ( i = 0; i < (int)fan_vertices.size(); ++i ) {
 701                     vindex[i] = fan_vertices[i];
 702                 }
 703                 for ( i = 0; i < (int)fan_tex_coords.size(); ++i ) {
 704                     tindex[i] = fan_tex_coords[i];
 705                 }
 706                 ssgLeaf *leaf =
 707                     new ssgVTable ( GL_TRIANGLE_FAN,
 708                                     fan_vertices.size(), vindex, t->vtlist,
 709                                     fan_vertices.size(), vindex, t->vnlist,
 710                                     fan_tex_coords.size(), tindex, t->tclist,
 711                                     0, NULL, NULL ) ;
 712                 leaf->setState( state );
 713
 714                 tile->addKid( leaf );
 715
 716             } else if ( token == "f" ) {
 717                 // unoptimized face
 718
 719                 if ( !in_faces ) {
 720                     // xglBegin(GL_TRIANGLES);
 721                     // printf("xglBegin(triangles)\n");
 722                     in_faces = true;
 723                 }
 724
 725                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "new triangle = %s", line);*/
 726                 in >> n1 >> n2 >> n3;
 727                 fragment.add_face(n1, n2, n3);
 728
 729                 // xglNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
 730                 // xglNormal3dv(normals[n1]);
 731                 pp = calc_tex_coords(nodes[n1], center);
 732                 // xglTexCoord2f(pp.lon(), pp.lat());
 733                 // xglVertex3dv(nodes[n1].get_n());
 734
 735                 // xglNormal3dv(normals[n2]);
 736                 pp = calc_tex_coords(nodes[n2], center);
 737                 // xglTexCoord2f(pp.lon(), pp.lat());
 738                 // xglVertex3dv(nodes[n2].get_n());
 739
 740                 // xglNormal3dv(normals[n3]);
 741                 pp = calc_tex_coords(nodes[n3], center);
 742                 // xglTexCoord2f(pp.lon(), pp.lat());
 743                 // xglVertex3dv(nodes[n3].get_n());
 744                 // printf("some normals, texcoords, and vertices (tris)\n");
 745             } else if ( token == "q" ) {
 746                 // continue a triangle strip
 747                 n1 = n2 = 0;
 748
 749                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "continued tri strip = %s ",
 750                 //           line);
 751                 in >> n1;
 752
 753                 // There can be one or two values
 754                 char c;
 755                 while ( in.get(c) ) {
 756                     if ( c == '\n' ) {
 757                         break; // only the one
 758                     }
 759
 760                     if ( isdigit(c) ) {
 761                         in.putback(c);
 762                         in >> n2;
 763                         break;
 764                     }
 765                 }
 766                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "read %d %d\n", n1, n2);
 767
 768                 if ( odd ) {
 769                     fragment.add_face(last1, last2, n1);
 770                 } else {
 771                     fragment.add_face(last2, last1, n1);
 772                 }
 773
 774                 if ( shading ) {
 775                     // Shading model is "GL_SMOOTH"
 776                     // MAT3_SCALE_VEC(normal, normals[n1], scale);
 777                 } else {
 778                     // Shading model is "GL_FLAT"
 779                     if ( odd ) {
 780                         calc_normal(nodes[last1], nodes[last2],
 781                                     nodes[n1], approx_normal);
 782                     } else {
 783                         calc_normal(nodes[last2], nodes[last1],
 784                                     nodes[n1], approx_normal);
 785                     }
 786                     // MAT3_SCALE_VEC(normal, approx_normal, scale);
 787                 }
 788                 // xglNormal3dv(normal);
 789
 790                 pp = calc_tex_coords(nodes[n1], center);
 791                 // xglTexCoord2f(pp.lon(), pp.lat());
 792                 // xglVertex3dv(nodes[n1].get_n());
 793                 // printf("a normal, texcoord, and vertex (4th)\n");
 794
 795                 odd = 1 - odd;
 796                 last1 = last2;
 797                 last2 = n1;
 798
 799                 if ( n2 > 0 ) {
 800                     // fgPrintf( FG_TERRAIN, FG_DEBUG, " (cont)\n");
 801
 802                     if ( odd ) {
 803                         fragment.add_face(last1, last2, n2);
 804                     } else {
 805                         fragment.add_face(last2, last1, n2);
 806                     }
 807
 808                     if ( shading ) {
 809                         // Shading model is "GL_SMOOTH"
 810                         // MAT3_SCALE_VEC(normal, normals[n2], scale);
 811                     } else {
 812                         // Shading model is "GL_FLAT"
 813                         if ( odd ) {
 814                             calc_normal(nodes[last1], nodes[last2],
 815                                         nodes[n2], approx_normal);
 816                         } else {
 817                             calc_normal(nodes[last2], nodes[last1],
 818                                         nodes[n2], approx_normal);
 819                         }
 820                         // MAT3_SCALE_VEC(normal, approx_normal, scale);
 821                     }
 822                     // xglNormal3dv(normal);
 823
 824                     pp = calc_tex_coords(nodes[n2], center);
 825                     // xglTexCoord2f(pp.lon(), pp.lat());
 826                     // xglVertex3dv(nodes[n2].get_n());
 827                     // printf("a normal, texcoord, and vertex (4th)\n");
 828
 829                     odd = 1 -odd;
 830                     last1 = last2;
 831                     last2 = n2;
 832                 }
 833             } else {
 834                 FG_LOG( FG_TERRAIN, FG_WARN, "Unknown token in "
 835                         << path << " = " << token );
 836             }
 837
 838             // eat white space before start of while loop so if we are
 839             // done with useful input it is noticed before hand.
 840 #if defined( MACOS )
 841             in >> ::skipws;
 842 #else
 843             in >> skipws;
 844 #endif
 845         }
 846     }
 847
 848     if ( in_fragment ) {
 849         // close out the previous structure and start the next
 850         // xglEnd();
 851         // xglEndList();
 852         // printf("xglEnd(); xglEndList();\n");
 853
 854         // update fragment
 855         // fragment.display_list = display_list;
 856
 857         // push this fragment onto the tile's object list
 858         t->fragment_list.push_back(fragment);
 859     }
 860
 861 #if 0
 862     // Draw normal vectors (for visually verifying normals)
 863     xglBegin(GL_LINES);
 864     xglColor3f(0.0, 0.0, 0.0);
 865     for ( i = 0; i < t->ncount; i++ ) {
 866         xglVertex3d(nodes[i][0],
 867                     nodes[i][1] ,
 868                     nodes[i][2]);
 869         xglVertex3d(nodes[i][0] + 500*normals[i][0],
 870                     nodes[i][1] + 500*normals[i][1],
 871                     nodes[i][2] + 500*normals[i][2]);
 872     }
 873     xglEnd();
 874 #endif
 875
 876     t->nodes = nodes;
 877
 878     stopwatch.stop();
 879     FG_LOG( FG_TERRAIN, FG_DEBUG,
 880             "Loaded " << path << " in "
 881             << stopwatch.elapsedSeconds() << " seconds" );
 882
 883     return tile;
 884 }
 885
 886