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