1 // tri2obj.cxx -- read in a .ele/.node file pair generated by the triangle
2 // program and output a simple Wavefront .obj file.
4 // Written by Curtis Olson, started October 1997.
6 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 // (Log is kept at end of this file)
27 #include <stdlib.h> // for atoi()
29 #include <sys/stat.h> // for stat()
30 #include <unistd.h> // for stat()
32 #include "tri2obj.hxx"
34 #include <Include/fg_constants.h>
35 #include <Bucket/bucketutils.h>
37 #include <Math/fg_geodesy.hxx>
38 #include <Math/mat3.h>
39 #include <Math/polar3d.hxx>
42 int nodecount, tricount;
44 static Point3D nodes[MAX_NODES];
45 static int tris[MAX_TRIS][3];
47 static double normals[MAX_NODES][3];
50 fgBUCKET ne_index, nw_index, sw_index, se_index;
51 fgBUCKET north_index, south_index, east_index, west_index;
54 // given three points defining a triangle, calculate the normal
55 void calc_normal(const Point3D& p1, const Point3D& p2,
56 const Point3D& p3, double normal[3])
61 v1[0] = p2.x() - p1.x(); v1[1] = p2.y() - p1.y(); v1[2] = p2.z() - p1.z();
62 v2[0] = p3.x() - p1.x(); v2[1] = p3.y() - p1.y(); v2[2] = p3.z() - p1.z();
64 MAT3cross_product(normal, v1, v2);
65 MAT3_NORMALIZE_VEC(normal, temp);
67 // printf(" Normal = %.2f %.2f %.2f\n", normal[0], normal[1], normal[2]);
71 // return the index of all triangles containing the specified node
72 void find_tris(int n, int *t1, int *t2, int *t3, int *t4, int *t5) {
75 *t1 = *t2 = *t3 = *t4 = *t5 = 0;
78 while ( i <= tricount ) {
79 if ( (n == tris[i][0]) || (n == tris[i][1]) || (n == tris[i][2]) ) {
82 } else if ( *t2 == 0 ) {
84 } else if ( *t3 == 0 ) {
86 } else if ( *t4 == 0 ) {
97 // return the file base name ( foo/bar/file.ext = file.ext )
98 void extract_file(char *in, char *base) {
104 while ( (i >= 0) && (in[i] != '/') ) {
113 // return the file path name ( foo/bar/file.ext = foo/bar )
114 void extract_path(char *in, char *base) {
121 while ( (i >= 0) && (in[i] != '/') ) {
129 // check if a file exists
130 int file_exists(char *file) {
131 struct stat stat_buf;
134 printf("checking %s ... ", file);
136 result = stat(file, &stat_buf);
139 // stat failed, no file
140 printf("not found.\n");
143 // stat succeeded, file exists
150 // check to see if a shared object exists
151 int shared_object_exists(char *basepath, char *ext, char *file) {
152 char scene_path[256];
155 if ( strcmp(ext, ".sw") == 0 ) {
156 fgBucketGenBasePath(&my_index, scene_path);
157 index = fgBucketGenIndex(&my_index);
158 sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
159 if ( file_exists(file) ) {
162 fgBucketGenBasePath(&west_index, scene_path);
163 index = fgBucketGenIndex(&west_index);
164 sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
165 if ( file_exists(file) ) {
168 fgBucketGenBasePath(&sw_index, scene_path);
169 index = fgBucketGenIndex(&sw_index);
170 sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
171 if ( file_exists(file) ) {
174 fgBucketGenBasePath(&south_index, scene_path);
175 index = fgBucketGenIndex(&south_index);
176 sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
177 if ( file_exists(file) ) {
182 if ( strcmp(ext, ".se") == 0 ) {
183 fgBucketGenBasePath(&my_index, scene_path);
184 index = fgBucketGenIndex(&my_index);
185 sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
186 if ( file_exists(file) ) {
189 fgBucketGenBasePath(&east_index, scene_path);
190 index = fgBucketGenIndex(&east_index);
191 sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
192 if ( file_exists(file) ) {
195 fgBucketGenBasePath(&se_index, scene_path);
196 index = fgBucketGenIndex(&se_index);
197 sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
198 if ( file_exists(file) ) {
201 fgBucketGenBasePath(&south_index, scene_path);
202 index = fgBucketGenIndex(&south_index);
203 sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
204 if ( file_exists(file) ) {
209 if ( strcmp(ext, ".ne") == 0 ) {
210 fgBucketGenBasePath(&my_index, scene_path);
211 index = fgBucketGenIndex(&my_index);
212 sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
213 if ( file_exists(file) ) {
216 fgBucketGenBasePath(&east_index, scene_path);
217 index = fgBucketGenIndex(&east_index);
218 sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
219 if ( file_exists(file) ) {
222 fgBucketGenBasePath(&ne_index, scene_path);
223 index = fgBucketGenIndex(&ne_index);
224 sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
225 if ( file_exists(file) ) {
228 fgBucketGenBasePath(&north_index, scene_path);
229 index = fgBucketGenIndex(&north_index);
230 sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
231 if ( file_exists(file) ) {
236 if ( strcmp(ext, ".nw") == 0 ) {
237 fgBucketGenBasePath(&my_index, scene_path);
238 index = fgBucketGenIndex(&my_index);
239 sprintf(file, "%s/%s/%ld.1.nw", basepath, scene_path, index);
240 if ( file_exists(file) ) {
243 fgBucketGenBasePath(&west_index, scene_path);
244 index = fgBucketGenIndex(&west_index);
245 sprintf(file, "%s/%s/%ld.1.ne", basepath, scene_path, index);
246 if ( file_exists(file) ) {
249 fgBucketGenBasePath(&nw_index, scene_path);
250 index = fgBucketGenIndex(&nw_index);
251 sprintf(file, "%s/%s/%ld.1.se", basepath, scene_path, index);
252 if ( file_exists(file) ) {
255 fgBucketGenBasePath(&north_index, scene_path);
256 index = fgBucketGenIndex(&north_index);
257 sprintf(file, "%s/%s/%ld.1.sw", basepath, scene_path, index);
258 if ( file_exists(file) ) {
263 if ( strcmp(ext, ".south") == 0 ) {
264 fgBucketGenBasePath(&my_index, scene_path);
265 index = fgBucketGenIndex(&my_index);
266 sprintf(file, "%s/%s/%ld.1.south", basepath, scene_path, index);
267 if ( file_exists(file) ) {
270 fgBucketGenBasePath(&south_index, scene_path);
271 index = fgBucketGenIndex(&south_index);
272 sprintf(file, "%s/%s/%ld.1.north", basepath, scene_path, index);
273 if ( file_exists(file) ) {
278 if ( strcmp(ext, ".north") == 0 ) {
279 fgBucketGenBasePath(&my_index, scene_path);
280 index = fgBucketGenIndex(&my_index);
281 sprintf(file, "%s/%s/%ld.1.north", basepath, scene_path, index);
282 if ( file_exists(file) ) {
285 fgBucketGenBasePath(&north_index, scene_path);
286 index = fgBucketGenIndex(&north_index);
287 sprintf(file, "%s/%s/%ld.1.south", basepath, scene_path, index);
288 if ( file_exists(file) ) {
293 if ( strcmp(ext, ".west") == 0 ) {
294 fgBucketGenBasePath(&my_index, scene_path);
295 index = fgBucketGenIndex(&my_index);
296 sprintf(file, "%s/%s/%ld.1.west", basepath, scene_path, index);
297 if ( file_exists(file) ) {
300 fgBucketGenBasePath(&west_index, scene_path);
301 index = fgBucketGenIndex(&west_index);
302 sprintf(file, "%s/%s/%ld.1.east", basepath, scene_path, index);
303 if ( file_exists(file) ) {
308 if ( strcmp(ext, ".east") == 0 ) {
309 fgBucketGenBasePath(&my_index, scene_path);
310 index = fgBucketGenIndex(&my_index);
311 sprintf(file, "%s/%s/%ld.1.east", basepath, scene_path, index);
312 if ( file_exists(file) ) {
315 fgBucketGenBasePath(&east_index, scene_path);
316 index = fgBucketGenIndex(&east_index);
317 sprintf(file, "%s/%s/%ld.1.west", basepath, scene_path, index);
318 if ( file_exists(file) ) {
323 if ( strcmp(ext, ".body") == 0 ) {
324 fgBucketGenBasePath(&my_index, scene_path);
325 index = fgBucketGenIndex(&my_index);
326 sprintf(file, "%s/%s/%ld.1.body", basepath, scene_path, index);
327 if ( file_exists(file) ) {
336 // given a file pointer, read all the vn (normals from it)
337 void read_normals(FILE *fp) {
340 while ( fgets(line, 250, fp) != NULL ) {
341 if ( strncmp(line, "vn ", 3) == 0 ) {
342 sscanf( line, "vn %lf %lf %lf\n",
343 &normals[normalcount][0],
344 &normals[normalcount][1],
345 &normals[normalcount][2] );
347 printf("read_normals(%d) %.2f %.2f %.2f %s", normalcount,
348 normals[normalcount][0], normals[normalcount][1],
349 normals[normalcount][2], line);
357 // my custom file opening routine ... don't open if a shared edge or
358 // vertex alread exists
359 FILE *my_open(char *basename, char *basepath, char *ext) {
363 // check if a shared object already exists
364 if ( shared_object_exists(basepath, ext, filename) ) {
365 // not an actual file open error, but we've already got the
366 // shared edge, so we don't want to create another one
367 fp = fopen(filename, "r");
368 printf("Opening %s\n", filename);
372 printf("not opening\n");
378 // Initialize a new mesh structure
379 void triload(char *basename, char *basepath) {
380 char nodename[256], elename[256];
383 FILE *ne, *nw, *se, *sw, *north, *south, *east, *west;
385 int dim, junk1, junk2;
388 ne = my_open(basename, basepath, ".ne");
392 nw = my_open(basename, basepath, ".nw");
396 se = my_open(basename, basepath, ".se");
400 sw = my_open(basename, basepath, ".sw");
404 north = my_open(basename, basepath, ".north");
408 south = my_open(basename, basepath, ".south");
412 east = my_open(basename, basepath, ".east");
416 west = my_open(basename, basepath, ".west");
420 strcpy(nodename, basename);
421 strcat(nodename, ".node");
422 strcpy(elename, basename);
423 strcat(elename, ".ele");
425 printf("Loading node file: %s ...\n", nodename);
426 if ( (node = fopen(nodename, "r")) == NULL ) {
427 printf("Cannot open file '%s'\n", nodename);
431 fscanf(node, "%d %d %d %d", &nodecount, &dim, &junk1, &junk2);
433 if ( nodecount > MAX_NODES - 1 ) {
434 printf("Error, too many nodes, need to increase array size\n");
437 printf(" Expecting %d nodes\n", nodecount);
440 for ( i = 1; i <= nodecount; i++ ) {
441 fscanf(node, "%d %lf %lf %lf %d\n", &junk1,
442 &n[0], &n[1], &n[2], &junk2);
443 // printf("%d %.2f %.2f %.2f\n", junk1, n[0], n[1], n[2]);
444 p = Point3D( n[0] * ARCSEC_TO_RAD,
445 n[1] * ARCSEC_TO_RAD,
447 nodes[i] = fgGeodToCart(p);
448 // printf("%d %.2f %.2f %.2f\n",
449 // junk1, nodes[i].x, nodes[i].y, nodes[i].z);
454 printf("Loading element file: %s ...\n", elename);
455 if ( (ele = fopen(elename, "r")) == NULL ) {
456 printf("Cannot open file '%s'\n", elename);
460 fscanf(ele, "%d %d %d", &tricount, &junk1, &junk2);
462 if ( tricount > MAX_TRIS - 1 ) {
463 printf("Error, too many elements, need to increase array size\n");
466 printf(" Expecting %d elements\n", tricount);
469 for ( i = 1; i <= tricount; i++ ) {
470 fscanf(ele, "%d %d %d %d\n", &junk1,
471 &tris[i][0], &tris[i][1], &tris[i][2]);
472 // printf("%d %d %d %d\n", junk1, tris[i][0], tris[i][1], tris[i][2]);*/
479 // dump in WaveFront .obj format
480 void dump_obj(char *basename) {
482 double n1[3], n2[3], n3[3], n4[3], n5[3], norm[3], temp;
484 int i, t1, t2, t3, t4, t5, count;
487 strcpy(objname, basename);
488 strcat(objname, ".obj");
490 printf("Dumping to file: %s ...\n", objname);
492 obj = fopen(objname, "w");
495 printf(" writing vertices\n");
496 for ( i = 1; i <= nodecount; i++ ) {
500 fprintf(obj, "v %.6f %.6f %.6f\n", x, y, z);
503 printf(" calculating and writing normals\n");
504 printf(" First %d normals taken from shared files.\n", normalcount);
506 // calculate and generate normals
507 for ( i = 1; i <= nodecount; i++ ) {
509 if ( i <= normalcount ) {
510 // use precalculated (shared) normal
511 norm[0] = normals[i-1][0];
512 norm[1] = normals[i-1][1];
513 norm[2] = normals[i-1][2];
515 // printf("Finding normal\n");
517 find_tris(i, &t1, &t2, &t3, &t4, &t5);
519 n1[0] = n1[1] = n1[2] = 0.0;
520 n2[0] = n2[1] = n2[2] = 0.0;
521 n3[0] = n3[1] = n3[2] = 0.0;
522 n4[0] = n4[1] = n4[2] = 0.0;
523 n5[0] = n5[1] = n5[2] = 0.0;
526 calc_normal(nodes[tris[t1][0]], nodes[tris[t1][1]],
527 nodes[tris[t1][2]], n1);
530 calc_normal(nodes[tris[t2][0]], nodes[tris[t2][1]],
531 nodes[tris[t2][2]], n2);
536 calc_normal(nodes[tris[t3][0]], nodes[tris[t3][1]],
537 nodes[tris[t3][2]], n3);
542 calc_normal(nodes[tris[t4][0]], nodes[tris[t4][1]],
543 nodes[tris[t4][2]], n4);
548 calc_normal(nodes[tris[t5][0]], nodes[tris[t5][1]],
549 nodes[tris[t5][2]], n5);
553 // printf(" norm[2] = %.2f %.2f %.2f\n", n1[2], n2[2], n3[2]);
555 norm[0] = ( n1[0] + n2[0] + n3[0] + n4[0] + n5[0] ) / (double)count;
556 norm[1] = ( n1[1] + n2[1] + n3[1] + n4[1] + n5[1] ) / (double)count;
557 norm[2] = ( n1[2] + n2[2] + n3[2] + n4[2] + n5[2] ) / (double)count;
559 // printf(" count = %d\n", count);
560 // printf(" Ave. normal = %.4f %.4f %.4f\n",
561 // norm[0], norm[1], norm[2]);*/
562 MAT3_NORMALIZE_VEC(norm, temp);
563 // printf(" Normalized ave. normal = %.4f %.4f %.4f\n",
564 // norm[0], norm[1], norm[2]);
566 // printf("%d vn %.4f %.4f %.4f\n", i, norm[0], norm[1], norm[2]);
567 fprintf(obj, "vn %.4f %.4f %.4f\n", norm[0], norm[1], norm[2]);
571 printf(" writing faces\n");
572 for ( i = 1; i <= tricount; i++ ) {
573 fprintf(obj, "f %d %d %d\n", tris[i][0], tris[i][1], tris[i][2]);
579 int main(int argc, char **argv) {
580 char basename[256], basepath[256], temp[256];
584 strcpy(basename, argv[1]);
586 // find the base path of the file
587 extract_path(basename, basepath);
588 extract_path(basepath, basepath);
589 extract_path(basepath, basepath);
590 printf("%s\n", basepath);
592 // find the index of the current file
593 extract_file(basename, temp);
598 tmp_index = atoi(temp);
599 printf("%ld\n", tmp_index);
600 fgBucketParseIndex(tmp_index, &my_index);
602 printf("bucket = %d %d %d %d\n",
603 my_index.lon, my_index.lat, my_index.x, my_index.y);
604 // generate the indexes of the neighbors
605 fgBucketOffset(&my_index, &ne_index, 1, 1);
606 fgBucketOffset(&my_index, &nw_index, -1, 1);
607 fgBucketOffset(&my_index, &se_index, 1, -1);
608 fgBucketOffset(&my_index, &sw_index, -1, -1);
610 fgBucketOffset(&my_index, &north_index, 0, 1);
611 fgBucketOffset(&my_index, &south_index, 0, -1);
612 fgBucketOffset(&my_index, &east_index, 1, 0);
613 fgBucketOffset(&my_index, &west_index, -1, 0);
615 // load the input data files
616 triload(basename, basepath);
618 // dump in WaveFront .obj format
626 // Revision 1.5 1998/10/21 14:56:50 curt
627 // Minor parameter passing tweak.
629 // Revision 1.4 1998/10/20 15:52:46 curt
630 // Fixed a units conversion bug introduced when converting to Point3D class.
632 // Revision 1.3 1998/10/19 19:33:31 curt
635 // Revision 1.2 1998/10/18 01:17:29 curt
638 // Revision 1.1 1998/07/08 14:54:53 curt
639 // renamed *.[ch] to *.[ch]xx
641 // Revision 1.17 1998/07/04 00:56:40 curt
642 // typedef'd struct fgBUCKET.
644 // Revision 1.16 1998/05/23 15:20:41 curt
645 // Output more digits after the decimal place.
647 // Revision 1.15 1998/05/02 01:54:39 curt
648 // Converting to polar3d.h routines.
650 // Revision 1.14 1998/04/18 04:01:32 curt
651 // Now use libMath rather than having local copies of math routines.
653 // Revision 1.13 1998/04/14 02:26:11 curt
654 // Code reorganizations. Added a Lib/ directory for more general libraries.
656 // Revision 1.12 1998/04/08 23:22:18 curt
657 // Adopted Gnu automake/autoconf system.
659 // Revision 1.11 1998/03/03 16:01:00 curt
660 // More c++ compile tweaks.
662 // Revision 1.10 1998/01/31 00:41:27 curt
663 // Made a few changes converting floats to doubles.
665 // Revision 1.9 1998/01/27 18:37:04 curt
666 // Lots of updates to get back in sync with changes made over in .../Src/
668 // Revision 1.8 1998/01/17 01:25:39 curt
669 // Added support for shared normals.
671 // Revision 1.7 1998/01/12 02:42:00 curt
672 // Average up to five triangles per vertex instead of three.
674 // Revision 1.6 1998/01/09 23:03:15 curt
675 // Restructured to split 1deg x 1deg dem's into 64 subsections.
677 // Revision 1.5 1997/12/08 19:17:50 curt
678 // Fixed a type in the normal generation code.
680 // Revision 1.4 1997/12/02 13:13:32 curt
681 // Fixed problem with averaged vertex normals.
683 // Revision 1.3 1997/11/15 18:05:05 curt
686 // Revision 1.2 1997/11/14 00:29:13 curt
687 // Transform scenery coordinates at this point in pipeline when scenery is
688 // being translated to .obj format, not when it is being loaded into the end
689 // renderer. Precalculate normals for each node as average of the normals
690 // of each containing polygon so Garoude shading is now supportable.
692 // Revision 1.1 1997/10/29 23:05:15 curt