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 <simgear/compiler.h>
  41
  42 #include STL_STRING
  43 #include <map>                  // STL
  44 #include <vector>               // STL
  45 #include <ctype.h>              // isdigit()
  46
  47 #include <simgear/constants.h>
  48 #include <simgear/debug/logstream.hxx>
  49 #include <simgear/math/fg_geodesy.hxx>
  50 #include <simgear/math/fg_random.h>
  51 #include <simgear/math/point3d.hxx>
  52 #include <simgear/math/polar3d.hxx>
  53 #include <simgear/misc/fgstream.hxx>
  54 #include <simgear/misc/stopwatch.hxx>
  55 #include <simgear/misc/texcoord.hxx>
  56
  57 #include <Main/options.hxx>
  58 #include <Scenery/tileentry.hxx>
  59
  60 #include "materialmgr.hxx"
  61 #include "obj.hxx"
  62
  63 FG_USING_STD(string);
  64 FG_USING_STD(vector);
  65
  66
  67 typedef vector < int > int_list;
  68 typedef int_list::iterator int_list_iterator;
  69 typedef int_list::const_iterator int_point_list_iterator;
  70
  71
  72 static double normals[FG_MAX_NODES][3];
  73 static double tex_coords[FG_MAX_NODES*3][3];
  74
  75
  76 // given three points defining a triangle, calculate the normal
  77 static void calc_normal(Point3D p1, Point3D p2,
  78                         Point3D p3, sgVec3 normal)
  79 {
  80     sgVec3 v1, v2;
  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     sgVectorProductVec3( normal, v1, v2 );
  86     sgNormalizeVec3( normal );
  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 // Calculate texture coordinates for a given point.
  96 static Point3D local_calc_tex_coords(const Point3D& node, const Point3D& ref) {
  97     Point3D cp;
  98     Point3D pp;
  99     // double tmplon, tmplat;
 100
 101     // cout << "-> " << node[0] << " " << node[1] << " " << node[2] << endl;
 102     // cout << "-> " << ref.x() << " " << ref.y() << " " << ref.z() << endl;
 103
 104     cp = Point3D( node[0] + ref.x(),
 105                   node[1] + ref.y(),
 106                   node[2] + ref.z() );
 107
 108     pp = fgCartToPolar3d(cp);
 109
 110     // tmplon = pp.lon() * RAD_TO_DEG;
 111     // tmplat = pp.lat() * RAD_TO_DEG;
 112     // cout << tmplon << " " << tmplat << endl;
 113
 114     pp.setx( fmod(RAD_TO_DEG * FG_TEX_CONSTANT * pp.x(), 11.0) );
 115     pp.sety( fmod(RAD_TO_DEG * FG_TEX_CONSTANT * pp.y(), 11.0) );
 116
 117     if ( pp.x() < 0.0 ) {
 118         pp.setx( pp.x() + 11.0 );
 119     }
 120
 121     if ( pp.y() < 0.0 ) {
 122         pp.sety( pp.y() + 11.0 );
 123     }
 124
 125     // cout << pp << endl;
 126
 127     return(pp);
 128 }
 129
 130
 131 // Generate a generic ocean tile on the fly
 132 ssgBranch *fgGenTile( const string& path, FGTileEntry *t) {
 133     fgFRAGMENT fragment;
 134     fragment.init();
 135     fragment.tile_ptr = t;
 136
 137     ssgSimpleState *state = NULL;
 138
 139     ssgBranch *tile = new ssgBranch () ;
 140     tile -> setName ( (char *)path.c_str() ) ;
 141
 142     // find Ocean material in the properties list
 143     if ( ! material_mgr.find( "Ocean", fragment.material_ptr )) {
 144         FG_LOG( FG_TERRAIN, FG_ALERT,
 145                 "Ack! unknown usemtl name = " << "Ocean"
 146                 << " in " << path );
 147     }
 148
 149     // set the texture width and height values for this
 150     // material
 151     FGMaterial m = fragment.material_ptr->get_m();
 152     double tex_width = m.get_xsize();
 153     // double tex_height = m.get_ysize();
 154
 155     // set ssgState
 156     state = fragment.material_ptr->get_state();
 157
 158     // Calculate center point
 159     FGBucket b = t->tile_bucket;
 160     double clon = b.get_center_lon();
 161     double clat = b.get_center_lat();
 162     double height = b.get_height();
 163     double width = b.get_width();
 164
 165     Point3D center = fgGeodToCart(Point3D(clon*DEG_TO_RAD,clat*DEG_TO_RAD,0.0));
 166     t->center = center;
 167     fragment.center = center;
 168     // cout << "center = " << center << endl;;
 169
 170     // Caculate corner vertices
 171     Point3D geod[4];
 172     geod[0] = Point3D( clon - width/2.0, clat - height/2.0, 0.0 );
 173     geod[1] = Point3D( clon + width/2.0, clat - height/2.0, 0.0 );
 174     geod[2] = Point3D( clon + width/2.0, clat + height/2.0, 0.0 );
 175     geod[3] = Point3D( clon - width/2.0, clat + height/2.0, 0.0 );
 176
 177     Point3D rad[4];
 178     int i;
 179     for ( 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 ( 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 ( 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     point_list geod_nodes;
 211     geod_nodes.clear();
 212     for ( i = 0; i < 4; ++i ) {
 213         geod_nodes.push_back( geod[i] );
 214     }
 215     int_list rectangle;
 216     rectangle.clear();
 217     for ( i = 0; i < 4; ++i ) {
 218         rectangle.push_back( i );
 219     }
 220     point_list texs = calc_tex_coords( b, geod_nodes, rectangle,
 221                                        1000.0 / tex_width );
 222
 223     // Build flight gear structure
 224     fragment.add_face(0, 1, 2);
 225     fragment.add_face(0, 2, 3);
 226     t->fragment_list.push_back(fragment);
 227
 228     // Allocate ssg structure
 229     ssgVertexArray   *vl = new ssgVertexArray( 4 );
 230     ssgNormalArray   *nl = new ssgNormalArray( 4 );
 231     ssgTexCoordArray *tl = new ssgTexCoordArray( 4 );
 232     ssgColourArray   *cl = new ssgColourArray( 1 );
 233
 234     sgVec4 color;
 235     sgSetVec4( color, 1.0, 1.0, 1.0, 1.0 );
 236     cl->add( color );
 237
 238     // sgVec3 *vtlist = new sgVec3 [ 4 ];
 239     // t->vec3_ptrs.push_back( vtlist );
 240     // sgVec3 *vnlist = new sgVec3 [ 4 ];
 241     // t->vec3_ptrs.push_back( vnlist );
 242     // sgVec2 *tclist = new sgVec2 [ 4 ];
 243     // t->vec2_ptrs.push_back( tclist );
 244
 245     sgVec2 tmp2;
 246     sgVec3 tmp3;
 247     for ( i = 0; i < 4; ++i ) {
 248         sgSetVec3( tmp3,
 249                    rel[i].x(), rel[i].y(), rel[i].z() );
 250         vl->add( tmp3 );
 251
 252         sgSetVec3( tmp3,
 253                    normals[i].x(), normals[i].y(), normals[i].z() );
 254         nl->add( tmp3 );
 255
 256         sgSetVec2( tmp2, texs[i].x(), texs[i].y());
 257         tl->add( tmp2 );
 258     }
 259
 260     ssgLeaf *leaf =
 261         new ssgVtxTable ( GL_TRIANGLE_FAN, vl, nl, tl, cl );
 262
 263     leaf->setState( state );
 264
 265     tile->addKid( leaf );
 266     // if ( current_options.get_clouds() ) {
 267     //    fgGenCloudTile(path, t, tile);
 268     // }
 269
 270     return tile;
 271 }
 272
 273
 274 // Load a .obj file and build the fragment list
 275 ssgBranch *fgObjLoad( const string& path, FGTileEntry *t, const bool is_base) {
 276     fgFRAGMENT fragment;
 277     Point3D pp;
 278     sgVec3 approx_normal;
 279     // double normal[3], scale = 0.0;
 280     // double x, y, z, xmax, xmin, ymax, ymin, zmax, zmin;
 281     // GLfloat sgenparams[] = { 1.0, 0.0, 0.0, 0.0 };
 282     // GLint display_list = 0;
 283     int shading;
 284     bool in_fragment = false, in_faces = false;
 285     int vncount, vtcount;
 286     int n1 = 0, n2 = 0, n3 = 0, n4 = 0;
 287     int tex;
 288     int last1 = 0, last2 = 0;
 289     bool odd = false;
 290     point_list nodes;
 291     Point3D node;
 292     Point3D center;
 293     double scenery_version = 0.0;
 294     double tex_width = 1000.0, tex_height = 1000.0;
 295     bool shared_done = false;
 296     int_list fan_vertices;
 297     int_list fan_tex_coords;
 298     int i;
 299     ssgSimpleState *state = NULL;
 300     sgVec3 *vtlist, *vnlist;
 301     sgVec2 *tclist;
 302
 303     ssgBranch *tile = new ssgBranch () ;
 304
 305     tile -> setName ( (char *)path.c_str() ) ;
 306
 307     // Attempt to open "path.gz" or "path"
 308     fg_gzifstream in( path );
 309     if ( ! in.is_open() ) {
 310         FG_LOG( FG_TERRAIN, FG_ALERT, "Cannot open file: " << path );
 311         FG_LOG( FG_TERRAIN, FG_ALERT, "default to ocean tile: " << path );
 312
 313         return fgGenTile( path, t );
 314     }
 315
 316     shading = current_options.get_shading();
 317
 318     in_fragment = false;
 319     if ( is_base ) {
 320         t->ncount = 0;
 321     }
 322     vncount = 0;
 323     vtcount = 0;
 324     if ( is_base ) {
 325         t->bounding_radius = 0.0;
 326     }
 327     center = t->center;
 328
 329     StopWatch stopwatch;
 330     stopwatch.start();
 331
 332     // ignore initial comments and blank lines. (priming the pump)
 333     // in >> skipcomment;
 334     // string line;
 335
 336     string token;
 337     char c;
 338
 339 #ifdef __MWERKS__
 340     while ( in.get(c) && c  != '\0' ) {
 341         in.putback(c);
 342 #else
 343     while ( ! in.eof() ) {
 344 #endif
 345
 346 #if defined( MACOS )
 347         in >> ::skipws;
 348 #else
 349         in >> skipws;
 350 #endif
 351
 352         if ( in.get( c ) && c == '#' ) {
 353             // process a comment line
 354
 355             // getline( in, line );
 356             // cout << "comment = " << line << endl;
 357
 358             in >> token;
 359
 360             if ( token == "Version" ) {
 361                 // read scenery versions number
 362                 in >> scenery_version;
 363                 // cout << "scenery_version = " << scenery_version << endl;
 364             } else if ( token == "gbs" ) {
 365                 // reference point (center offset)
 366                 if ( is_base ) {
 367                     in >> t->center >> t->bounding_radius;
 368                 } else {
 369                     Point3D junk1;
 370                     double junk2;
 371                     in >> junk1 >> junk2;
 372                 }
 373                 center = t->center;
 374                 // cout << "center = " << center
 375                 //      << " radius = " << t->bounding_radius << endl;
 376             } else if ( token == "bs" ) {
 377                 // reference point (center offset)
 378                 in >> fragment.center;
 379                 in >> fragment.bounding_radius;
 380
 381                 // cout << "center = " << fragment.center
 382                 //      << " radius = " << fragment.bounding_radius << endl;
 383             } else if ( token == "usemtl" ) {
 384                 // material property specification
 385
 386                 // if first usemtl with shared_done = false, then set
 387                 // shared_done true and build the ssg shared lists
 388                 if ( ! shared_done ) {
 389                     // sanity check
 390                     if ( (int)nodes.size() != vncount ) {
 391                         FG_LOG( FG_TERRAIN, FG_ALERT,
 392                                 "Tile has mismatched nodes and normals: "
 393                                 << path );
 394                         // exit(-1);
 395                     }
 396                     shared_done = true;
 397
 398                     vtlist = new sgVec3 [ nodes.size() ];
 399                     t->vec3_ptrs.push_back( vtlist );
 400                     vnlist = new sgVec3 [ vncount ];
 401                     t->vec3_ptrs.push_back( vnlist );
 402                     tclist = new sgVec2 [ vtcount ];
 403                     t->vec2_ptrs.push_back( tclist );
 404
 405                     for ( i = 0; i < (int)nodes.size(); ++i ) {
 406                         sgSetVec3( vtlist[i],
 407                                    nodes[i][0], nodes[i][1], nodes[i][2] );
 408                     }
 409                     for ( i = 0; i < vncount; ++i ) {
 410                         sgSetVec3( vnlist[i],
 411                                    normals[i][0],
 412                                    normals[i][1],
 413                                    normals[i][2] );
 414                     }
 415                     for ( i = 0; i < vtcount; ++i ) {
 416                         sgSetVec2( tclist[i],
 417                                    tex_coords[i][0],
 418                                    tex_coords[i][1] );
 419                     }
 420                 }
 421
 422                 // series of individual triangles
 423                 // if ( in_faces ) {
 424                 //     xglEnd();
 425                 // }
 426
 427                 // this also signals the start of a new fragment
 428                 if ( in_fragment ) {
 429                     // close out the previous structure and start the next
 430                     // xglEndList();
 431                     // printf("xglEnd(); xglEndList();\n");
 432
 433                     // update fragment
 434                     // fragment.display_list = display_list;
 435
 436                     // push this fragment onto the tile's object list
 437                     t->fragment_list.push_back(fragment);
 438                 } else {
 439                     in_fragment = true;
 440                 }
 441
 442                 // printf("start of fragment (usemtl)\n");
 443
 444                 // display_list = xglGenLists(1);
 445                 // xglNewList(display_list, GL_COMPILE);
 446                 // printf("xglGenLists(); xglNewList();\n");
 447                 in_faces = false;
 448
 449                 // reset the existing face list
 450                 // printf("cleaning a fragment with %d faces\n",
 451                 //        fragment.faces.size());
 452                 fragment.init();
 453
 454                 // scan the material line
 455                 string material;
 456                 in >> material;
 457                 fragment.tile_ptr = t;
 458
 459                 // find this material in the properties list
 460                 if ( ! material_mgr.find( material, fragment.material_ptr )) {
 461                     FG_LOG( FG_TERRAIN, FG_ALERT,
 462                             "Ack! unknown usemtl name = " << material
 463                             << " in " << path );
 464                 }
 465
 466                 // set the texture width and height values for this
 467                 // material
 468                 FGMaterial m = fragment.material_ptr->get_m();
 469                 tex_width = m.get_xsize();
 470                 tex_height = m.get_ysize();
 471                 state = fragment.material_ptr->get_state();
 472                 // cout << "(w) = " << tex_width << " (h) = "
 473                 //      << tex_width << endl;
 474
 475                 // initialize the fragment transformation matrix
 476                 /*
 477                  for ( i = 0; i < 16; i++ ) {
 478                    fragment.matrix[i] = 0.0;
 479                  }
 480                  fragment.matrix[0] = fragment.matrix[5] =
 481                  fragment.matrix[10] = fragment.matrix[15] = 1.0;
 482                 */
 483             } else {
 484                 // unknown comment, just gobble the input untill the
 485                 // end of line
 486
 487                 in >> skipeol;
 488             }
 489         } else {
 490             in.putback( c );
 491
 492             in >> token;
 493
 494             // cout << "token = " << token << endl;
 495
 496             if ( token == "vn" ) {
 497                 // vertex normal
 498                 if ( vncount < FG_MAX_NODES ) {
 499                     in >> normals[vncount][0]
 500                        >> normals[vncount][1]
 501                        >> normals[vncount][2];
 502                     vncount++;
 503                 } else {
 504                     FG_LOG( FG_TERRAIN, FG_ALERT,
 505                             "Read too many vertex normals in " << path
 506                             << " ... dying :-(" );
 507                     exit(-1);
 508                 }
 509             } else if ( token == "vt" ) {
 510                 // vertex texture coordinate
 511                 if ( vtcount < FG_MAX_NODES*3 ) {
 512                     in >> tex_coords[vtcount][0]
 513                        >> tex_coords[vtcount][1];
 514                     vtcount++;
 515                 } else {
 516                     FG_LOG( FG_TERRAIN, FG_ALERT,
 517                             "Read too many vertex texture coords in " << path
 518                             << " ... dying :-("
 519                             );
 520                     exit(-1);
 521                 }
 522             } else if ( token == "v" ) {
 523                 // node (vertex)
 524                 if ( t->ncount < FG_MAX_NODES ) {
 525                     /* in >> nodes[t->ncount][0]
 526                        >> nodes[t->ncount][1]
 527                        >> nodes[t->ncount][2]; */
 528                     in >> node;
 529                     nodes.push_back(node);
 530                     if ( is_base ) {
 531                         t->ncount++;
 532                     }
 533                 } else {
 534                     FG_LOG( FG_TERRAIN, FG_ALERT,
 535                             "Read too many nodes in " << path
 536                             << " ... dying :-(");
 537                     exit(-1);
 538                 }
 539             } else if ( token == "t" ) {
 540                 // start a new triangle strip
 541
 542                 n1 = n2 = n3 = n4 = 0;
 543
 544                 // fgPrintf( FG_TERRAIN, FG_DEBUG,
 545                 //           "    new tri strip = %s", line);
 546                 in >> n1 >> n2 >> n3;
 547                 fragment.add_face(n1, n2, n3);
 548
 549                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "(t) = ");
 550
 551                 // xglBegin(GL_TRIANGLE_STRIP);
 552                 // printf("xglBegin(tristrip) %d %d %d\n", n1, n2, n3);
 553
 554                 odd = true;
 555                 // scale = 1.0;
 556
 557                 if ( shading ) {
 558                     // Shading model is "GL_SMOOTH" so use precalculated
 559                     // (averaged) normals
 560                     // MAT3_SCALE_VEC(normal, normals[n1], scale);
 561                     // xglNormal3dv(normal);
 562                     pp = local_calc_tex_coords(nodes[n1], center);
 563                     // xglTexCoord2f(pp.lon(), pp.lat());
 564                     // xglVertex3dv(nodes[n1].get_n());
 565
 566                     // MAT3_SCALE_VEC(normal, normals[n2], scale);
 567                     // xglNormal3dv(normal);
 568                     pp = local_calc_tex_coords(nodes[n2], center);
 569                     // xglTexCoord2f(pp.lon(), pp.lat());
 570                     // xglVertex3dv(nodes[n2].get_n());
 571
 572                     // MAT3_SCALE_VEC(normal, normals[n3], scale);
 573                     // xglNormal3dv(normal);
 574                     pp = local_calc_tex_coords(nodes[n3], center);
 575                     // xglTexCoord2f(pp.lon(), pp.lat());
 576                     // xglVertex3dv(nodes[n3].get_n());
 577                 } else {
 578                     // Shading model is "GL_FLAT" so calculate per face
 579                     // normals on the fly.
 580                     if ( odd ) {
 581                         calc_normal(nodes[n1], nodes[n2],
 582                                     nodes[n3], approx_normal);
 583                     } else {
 584                         calc_normal(nodes[n2], nodes[n1],
 585                                     nodes[n3], approx_normal);
 586                     }
 587                     // MAT3_SCALE_VEC(normal, approx_normal, scale);
 588                     // xglNormal3dv(normal);
 589
 590                     pp = local_calc_tex_coords(nodes[n1], center);
 591                     // xglTexCoord2f(pp.lon(), pp.lat());
 592                     // xglVertex3dv(nodes[n1].get_n());
 593
 594                     pp = local_calc_tex_coords(nodes[n2], center);
 595                     // xglTexCoord2f(pp.lon(), pp.lat());
 596                     // xglVertex3dv(nodes[n2].get_n());
 597
 598                     pp = local_calc_tex_coords(nodes[n3], center);
 599                     // xglTexCoord2f(pp.lon(), pp.lat());
 600                     // xglVertex3dv(nodes[n3].get_n());
 601                 }
 602                 // printf("some normals, texcoords, and vertices\n");
 603
 604                 odd = !odd;
 605                 last1 = n2;
 606                 last2 = n3;
 607
 608                 // There can be three or four values
 609                 char c;
 610                 while ( in.get(c) ) {
 611                     if ( c == '\n' ) {
 612                         break; // only the one
 613                     }
 614                     if ( isdigit(c) ){
 615                         in.putback(c);
 616                         in >> n4;
 617                         break;
 618                     }
 619                 }
 620
 621                 if ( n4 > 0 ) {
 622                     fragment.add_face(n3, n2, n4);
 623
 624                     if ( shading ) {
 625                         // Shading model is "GL_SMOOTH"
 626                         // MAT3_SCALE_VEC(normal, normals[n4], scale);
 627                     } else {
 628                         // Shading model is "GL_FLAT"
 629                         calc_normal(nodes[n3], nodes[n2], nodes[n4],
 630                                     approx_normal);
 631                         // MAT3_SCALE_VEC(normal, approx_normal, scale);
 632                     }
 633                     // xglNormal3dv(normal);
 634                     pp = local_calc_tex_coords(nodes[n4], center);
 635                     // xglTexCoord2f(pp.lon(), pp.lat());
 636                     // xglVertex3dv(nodes[n4].get_n());
 637
 638                     odd = !odd;
 639                     last1 = n3;
 640                     last2 = n4;
 641                     // printf("a normal, texcoord, and vertex (4th)\n");
 642                 }
 643             } else if ( (token == "tf") || (token == "ts") ) {
 644                 // triangle fan
 645                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "new fan");
 646
 647                 fan_vertices.clear();
 648                 fan_tex_coords.clear();
 649                 odd = true;
 650
 651                 // xglBegin(GL_TRIANGLE_FAN);
 652
 653                 in >> n1;
 654                 fan_vertices.push_back( n1 );
 655                 // xglNormal3dv(normals[n1]);
 656                 if ( in.get( c ) && c == '/' ) {
 657                     in >> tex;
 658                     fan_tex_coords.push_back( tex );
 659                     if ( scenery_version >= 0.4 ) {
 660                         if ( tex_width > 0 ) {
 661                             tclist[tex][0] *= (1000.0 / tex_width);
 662                         }
 663                         if ( tex_height > 0 ) {
 664                             tclist[tex][1] *= (1000.0 / tex_height);
 665                         }
 666                     }
 667                     pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 668                     pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 669                 } else {
 670                     in.putback( c );
 671                     pp = local_calc_tex_coords(nodes[n1], center);
 672                 }
 673                 // xglTexCoord2f(pp.x(), pp.y());
 674                 // xglVertex3dv(nodes[n1].get_n());
 675
 676                 in >> n2;
 677                 fan_vertices.push_back( n2 );
 678                 // xglNormal3dv(normals[n2]);
 679                 if ( in.get( c ) && c == '/' ) {
 680                     in >> tex;
 681                     fan_tex_coords.push_back( tex );
 682                     if ( scenery_version >= 0.4 ) {
 683                         if ( tex_width > 0 ) {
 684                             tclist[tex][0] *= (1000.0 / tex_width);
 685                         }
 686                         if ( tex_height > 0 ) {
 687                             tclist[tex][1] *= (1000.0 / tex_height);
 688                         }
 689                     }
 690                     pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 691                     pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 692                 } else {
 693                     in.putback( c );
 694                     pp = local_calc_tex_coords(nodes[n2], center);
 695                 }
 696                 // xglTexCoord2f(pp.x(), pp.y());
 697                 // xglVertex3dv(nodes[n2].get_n());
 698
 699                 // read all subsequent numbers until next thing isn't a number
 700                 while ( true ) {
 701 #if defined( MACOS )
 702                     in >> ::skipws;
 703 #else
 704                     in >> skipws;
 705 #endif
 706
 707                     char c;
 708                     in.get(c);
 709                     in.putback(c);
 710                     if ( ! isdigit(c) || in.eof() ) {
 711                         break;
 712                     }
 713
 714                     in >> n3;
 715                     fan_vertices.push_back( n3 );
 716                     // cout << "  triangle = "
 717                     //      << n1 << "," << n2 << "," << n3
 718                     //      << endl;
 719                     // xglNormal3dv(normals[n3]);
 720                     if ( in.get( c ) && c == '/' ) {
 721                         in >> tex;
 722                         fan_tex_coords.push_back( tex );
 723                         if ( scenery_version >= 0.4 ) {
 724                             if ( tex_width > 0 ) {
 725                                 tclist[tex][0] *= (1000.0 / tex_width);
 726                             }
 727                             if ( tex_height > 0 ) {
 728                                 tclist[tex][1] *= (1000.0 / tex_height);
 729                             }
 730                         }
 731                         pp.setx( tex_coords[tex][0] * (1000.0 / tex_width) );
 732                         pp.sety( tex_coords[tex][1] * (1000.0 / tex_height) );
 733                     } else {
 734                         in.putback( c );
 735                         pp = local_calc_tex_coords(nodes[n3], center);
 736                     }
 737                     // xglTexCoord2f(pp.x(), pp.y());
 738                     // xglVertex3dv(nodes[n3].get_n());
 739
 740                     if ( token == "tf" ) {
 741                         // triangle fan
 742                         fragment.add_face(n1, n2, n3);
 743                         n2 = n3;
 744                     } else {
 745                         // triangle strip
 746                         if ( odd ) {
 747                             fragment.add_face(n1, n2, n3);
 748                         } else {
 749                             fragment.add_face(n2, n1, n3);
 750                         }
 751                         odd = !odd;
 752                         n1 = n2;
 753                         n2 = n3;
 754                     }
 755                 }
 756
 757                 // xglEnd();
 758
 759                 // build the ssg entity
 760                 int size = (int)fan_vertices.size();
 761                 ssgVertexArray   *vl = new ssgVertexArray( size );
 762                 ssgNormalArray   *nl = new ssgNormalArray( size );
 763                 ssgTexCoordArray *tl = new ssgTexCoordArray( size );
 764                 ssgColourArray   *cl = new ssgColourArray( 1 );
 765
 766                 sgVec4 color;
 767                 sgSetVec4( color, 1.0, 1.0, 1.0, 1.0 );
 768                 cl->add( color );
 769
 770                 sgVec2 tmp2;
 771                 sgVec3 tmp3;
 772                 for ( i = 0; i < size; ++i ) {
 773                     sgCopyVec3( tmp3, vtlist[ fan_vertices[i] ] );
 774                     vl -> add( tmp3 );
 775
 776                     sgCopyVec3( tmp3, vnlist[ fan_vertices[i] ] );
 777                     nl -> add( tmp3 );
 778
 779                     sgCopyVec2( tmp2, tclist[ fan_tex_coords[i] ] );
 780                     tl -> add( tmp2 );
 781                 }
 782
 783                 ssgLeaf *leaf;
 784                 if ( token == "tf" ) {
 785                     // triangle fan
 786                     leaf =
 787                         new ssgVtxTable ( GL_TRIANGLE_FAN, vl, nl, tl, cl );
 788                 } else {
 789                     // triangle strip
 790                     leaf =
 791                         new ssgVtxTable ( GL_TRIANGLE_STRIP, vl, nl, tl, cl );
 792                 }
 793                 // leaf->makeDList();
 794                 leaf->setState( state );
 795
 796                 tile->addKid( leaf );
 797
 798             } else if ( token == "f" ) {
 799                 // unoptimized face
 800
 801                 if ( !in_faces ) {
 802                     // xglBegin(GL_TRIANGLES);
 803                     // printf("xglBegin(triangles)\n");
 804                     in_faces = true;
 805                 }
 806
 807                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "new triangle = %s", line);*/
 808                 in >> n1 >> n2 >> n3;
 809                 fragment.add_face(n1, n2, n3);
 810
 811                 // xglNormal3d(normals[n1][0], normals[n1][1], normals[n1][2]);
 812                 // xglNormal3dv(normals[n1]);
 813                 pp = local_calc_tex_coords(nodes[n1], center);
 814                 // xglTexCoord2f(pp.lon(), pp.lat());
 815                 // xglVertex3dv(nodes[n1].get_n());
 816
 817                 // xglNormal3dv(normals[n2]);
 818                 pp = local_calc_tex_coords(nodes[n2], center);
 819                 // xglTexCoord2f(pp.lon(), pp.lat());
 820                 // xglVertex3dv(nodes[n2].get_n());
 821
 822                 // xglNormal3dv(normals[n3]);
 823                 pp = local_calc_tex_coords(nodes[n3], center);
 824                 // xglTexCoord2f(pp.lon(), pp.lat());
 825                 // xglVertex3dv(nodes[n3].get_n());
 826                 // printf("some normals, texcoords, and vertices (tris)\n");
 827             } else if ( token == "q" ) {
 828                 // continue a triangle strip
 829                 n1 = n2 = 0;
 830
 831                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "continued tri strip = %s ",
 832                 //           line);
 833                 in >> n1;
 834
 835                 // There can be one or two values
 836                 char c;
 837                 while ( in.get(c) ) {
 838                     if ( c == '\n' ) {
 839                         break; // only the one
 840                     }
 841
 842                     if ( isdigit(c) ) {
 843                         in.putback(c);
 844                         in >> n2;
 845                         break;
 846                     }
 847                 }
 848                 // fgPrintf( FG_TERRAIN, FG_DEBUG, "read %d %d\n", n1, n2);
 849
 850                 if ( odd ) {
 851                     fragment.add_face(last1, last2, n1);
 852                 } else {
 853                     fragment.add_face(last2, last1, n1);
 854                 }
 855
 856                 if ( shading ) {
 857                     // Shading model is "GL_SMOOTH"
 858                     // MAT3_SCALE_VEC(normal, normals[n1], scale);
 859                 } else {
 860                     // Shading model is "GL_FLAT"
 861                     if ( odd ) {
 862                         calc_normal(nodes[last1], nodes[last2],
 863                                     nodes[n1], approx_normal);
 864                     } else {
 865                         calc_normal(nodes[last2], nodes[last1],
 866                                     nodes[n1], approx_normal);
 867                     }
 868                     // MAT3_SCALE_VEC(normal, approx_normal, scale);
 869                 }
 870                 // xglNormal3dv(normal);
 871
 872                 pp = local_calc_tex_coords(nodes[n1], center);
 873                 // xglTexCoord2f(pp.lon(), pp.lat());
 874                 // xglVertex3dv(nodes[n1].get_n());
 875                 // printf("a normal, texcoord, and vertex (4th)\n");
 876
 877                 odd = !odd;
 878                 last1 = last2;
 879                 last2 = n1;
 880
 881                 if ( n2 > 0 ) {
 882                     // fgPrintf( FG_TERRAIN, FG_DEBUG, " (cont)\n");
 883
 884                     if ( odd ) {
 885                         fragment.add_face(last1, last2, n2);
 886                     } else {
 887                         fragment.add_face(last2, last1, n2);
 888                     }
 889
 890                     if ( shading ) {
 891                         // Shading model is "GL_SMOOTH"
 892                         // MAT3_SCALE_VEC(normal, normals[n2], scale);
 893                     } else {
 894                         // Shading model is "GL_FLAT"
 895                         if ( odd ) {
 896                             calc_normal(nodes[last1], nodes[last2],
 897                                         nodes[n2], approx_normal);
 898                         } else {
 899                             calc_normal(nodes[last2], nodes[last1],
 900                                         nodes[n2], approx_normal);
 901                         }
 902                         // MAT3_SCALE_VEC(normal, approx_normal, scale);
 903                     }
 904                     // xglNormal3dv(normal);
 905
 906                     pp = local_calc_tex_coords(nodes[n2], center);
 907                     // xglTexCoord2f(pp.lon(), pp.lat());
 908                     // xglVertex3dv(nodes[n2].get_n());
 909                     // printf("a normal, texcoord, and vertex (4th)\n");
 910
 911                     odd = !odd;
 912                     last1 = last2;
 913                     last2 = n2;
 914                 }
 915             } else {
 916                 FG_LOG( FG_TERRAIN, FG_WARN, "Unknown token in "
 917                         << path << " = " << token );
 918             }
 919
 920             // eat white space before start of while loop so if we are
 921             // done with useful input it is noticed before hand.
 922 #if defined( MACOS )
 923             in >> ::skipws;
 924 #else
 925             in >> skipws;
 926 #endif
 927         }
 928     }
 929
 930     if ( in_fragment ) {
 931         // close out the previous structure and start the next
 932         // xglEnd();
 933         // xglEndList();
 934         // printf("xglEnd(); xglEndList();\n");
 935
 936         // update fragment
 937         // fragment.display_list = display_list;
 938
 939         // push this fragment onto the tile's object list
 940         t->fragment_list.push_back(fragment);
 941     }
 942
 943 #if 0
 944     // Draw normal vectors (for visually verifying normals)
 945     xglBegin(GL_LINES);
 946     xglColor3f(0.0, 0.0, 0.0);
 947     for ( i = 0; i < t->ncount; i++ ) {
 948         xglVertex3d(nodes[i][0],
 949                     nodes[i][1] ,
 950                     nodes[i][2]);
 951         xglVertex3d(nodes[i][0] + 500*normals[i][0],
 952                     nodes[i][1] + 500*normals[i][1],
 953                     nodes[i][2] + 500*normals[i][2]);
 954     }
 955     xglEnd();
 956 #endif
 957
 958     if ( is_base ) {
 959         t->nodes = nodes;
 960     }
 961
 962     stopwatch.stop();
 963     FG_LOG( FG_TERRAIN, FG_DEBUG,
 964             "Loaded " << path << " in "
 965             << stopwatch.elapsedSeconds() << " seconds" );
 966
 967     // Generate a cloud layer above the tiles
 968     // if ( current_options.get_clouds() ) {
 969     //          fgGenCloudTile(path, t, tile);
 970     // }
 971     return tile;
 972 }
 973
 974