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