| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
greg |
2.4 |
static const char RCSid[] = "$Id: writewfobj.c,v 2.3 2020/04/23 22:35:27 greg Exp $"; |
| 3 |
greg |
2.1 |
#endif |
| 4 |
|
|
/* |
| 5 |
|
|
* writewfobj.c |
| 6 |
|
|
* |
| 7 |
|
|
* Routines for writing out Wavefront file. |
| 8 |
|
|
* |
| 9 |
|
|
* Created by Greg Ward on Thu Feb 12 2004. |
| 10 |
|
|
*/ |
| 11 |
|
|
|
| 12 |
greg |
2.2 |
#include "paths.h" |
| 13 |
greg |
2.1 |
#include "rterror.h" |
| 14 |
|
|
#include "objutil.h" |
| 15 |
|
|
|
| 16 |
|
|
/* Delete unreferenced vertices */ |
| 17 |
|
|
static void |
| 18 |
|
|
del_unref_verts(Scene *sc) |
| 19 |
|
|
{ |
| 20 |
|
|
int *vmap; |
| 21 |
|
|
Face *f; |
| 22 |
|
|
int nused, i; |
| 23 |
|
|
/* allocate index map */ |
| 24 |
|
|
if (!sc->nverts) |
| 25 |
|
|
return; |
| 26 |
|
|
i = sc->nverts; |
| 27 |
|
|
if (sc->ntex > i) |
| 28 |
|
|
i = sc->ntex; |
| 29 |
|
|
if (sc->nnorms > i) |
| 30 |
|
|
i = sc->nnorms; |
| 31 |
|
|
vmap = (int *)emalloc(sizeof(int)*i); |
| 32 |
|
|
/* remap positions */ |
| 33 |
|
|
for (i = nused = 0; i < sc->nverts; i++) { |
| 34 |
|
|
if (sc->vert[i].vflist == NULL) { |
| 35 |
|
|
vmap[i] = -1; |
| 36 |
|
|
continue; |
| 37 |
|
|
} |
| 38 |
|
|
if (nused != i) |
| 39 |
|
|
sc->vert[nused] = sc->vert[i]; |
| 40 |
|
|
vmap[i] = nused++; |
| 41 |
|
|
} |
| 42 |
|
|
if (nused == sc->nverts) |
| 43 |
|
|
goto skip_pos; |
| 44 |
|
|
sc->vert = (Vertex *)erealloc((char *)sc->vert, |
| 45 |
|
|
sizeof(Vertex)*(nused+(CHUNKSIZ-1))); |
| 46 |
|
|
sc->nverts = nused; |
| 47 |
|
|
for (f = sc->flist; f != NULL; f = f->next) |
| 48 |
|
|
for (i = f->nv; i--; ) |
| 49 |
|
|
if ((f->v[i].vid = vmap[f->v[i].vid]) < 0) |
| 50 |
|
|
error(CONSISTENCY, |
| 51 |
|
|
"Link error in del_unref_verts()"); |
| 52 |
|
|
skip_pos: |
| 53 |
|
|
/* remap texture coord's */ |
| 54 |
|
|
if (!sc->ntex) |
| 55 |
|
|
goto skip_tex; |
| 56 |
|
|
memset((void *)vmap, 0, sizeof(int)*sc->ntex); |
| 57 |
|
|
for (f = sc->flist; f != NULL; f = f->next) |
| 58 |
|
|
for (i = f->nv; i--; ) |
| 59 |
|
|
if (f->v[i].tid >= 0) |
| 60 |
|
|
vmap[f->v[i].tid] = 1; |
| 61 |
|
|
for (i = nused = 0; i < sc->ntex; i++) { |
| 62 |
|
|
if (!vmap[i]) |
| 63 |
|
|
continue; |
| 64 |
|
|
if (nused != i) |
| 65 |
|
|
sc->tex[nused] = sc->tex[i]; |
| 66 |
|
|
vmap[i] = nused++; |
| 67 |
|
|
} |
| 68 |
|
|
if (nused == sc->ntex) |
| 69 |
|
|
goto skip_tex; |
| 70 |
|
|
sc->tex = (TexCoord *)erealloc((char *)sc->tex, |
| 71 |
|
|
sizeof(TexCoord)*(nused+(CHUNKSIZ-1))); |
| 72 |
|
|
sc->ntex = nused; |
| 73 |
|
|
for (f = sc->flist; f != NULL; f = f->next) |
| 74 |
|
|
for (i = f->nv; i--; ) |
| 75 |
|
|
if (f->v[i].tid >= 0) |
| 76 |
|
|
f->v[i].tid = vmap[f->v[i].tid]; |
| 77 |
|
|
skip_tex: |
| 78 |
|
|
/* remap normals */ |
| 79 |
|
|
if (!sc->nnorms) |
| 80 |
|
|
goto skip_norms; |
| 81 |
|
|
memset((void *)vmap, 0, sizeof(int)*sc->nnorms); |
| 82 |
|
|
for (f = sc->flist; f != NULL; f = f->next) |
| 83 |
|
|
for (i = f->nv; i--; ) |
| 84 |
|
|
if (f->v[i].nid >= 0) |
| 85 |
|
|
vmap[f->v[i].nid] = 1; |
| 86 |
|
|
for (i = nused = 0; i < sc->nnorms; i++) { |
| 87 |
|
|
if (!vmap[i]) |
| 88 |
|
|
continue; |
| 89 |
|
|
if (nused != i) |
| 90 |
|
|
memcpy((void *)sc->norm[nused], |
| 91 |
|
|
(void *)sc->norm[i], |
| 92 |
|
|
sizeof(Normal)); |
| 93 |
|
|
vmap[i] = nused++; |
| 94 |
|
|
} |
| 95 |
|
|
if (nused == sc->nnorms) |
| 96 |
|
|
goto skip_norms; |
| 97 |
|
|
sc->norm = (Normal *)erealloc((char *)sc->norm, |
| 98 |
|
|
sizeof(Normal)*(nused+(CHUNKSIZ-1))); |
| 99 |
|
|
sc->nnorms = nused; |
| 100 |
|
|
for (f = sc->flist; f != NULL; f = f->next) |
| 101 |
|
|
for (i = f->nv; i--; ) |
| 102 |
|
|
if (f->v[i].nid >= 0) |
| 103 |
|
|
f->v[i].nid = vmap[f->v[i].nid]; |
| 104 |
|
|
skip_norms: |
| 105 |
|
|
/* clean up */ |
| 106 |
|
|
efree((char *)vmap); |
| 107 |
|
|
} |
| 108 |
|
|
|
| 109 |
|
|
/* Write out header comments */ |
| 110 |
|
|
static void |
| 111 |
|
|
write_header(Scene *sc, FILE *fp) |
| 112 |
|
|
{ |
| 113 |
|
|
int i; |
| 114 |
|
|
|
| 115 |
|
|
for (i = 0; i < sc->ndescr; i++) |
| 116 |
|
|
fprintf(fp, "# %s\n", sc->descr[i]); |
| 117 |
|
|
fputs("#\n", fp); |
| 118 |
|
|
fprintf(fp, "# %d final faces\n", sc->nfaces); |
| 119 |
|
|
fprintf(fp, |
| 120 |
|
|
"#\t%d vertices, %d texture coordinates, %d surface normals\n", |
| 121 |
|
|
sc->nverts, sc->ntex, sc->nnorms); |
| 122 |
|
|
fputs("#\n\n", fp); |
| 123 |
|
|
} |
| 124 |
|
|
|
| 125 |
|
|
/* Write out vertex lists */ |
| 126 |
|
|
static void |
| 127 |
|
|
write_verts(Scene *sc, FILE *fp) |
| 128 |
|
|
{ |
| 129 |
|
|
int i; |
| 130 |
|
|
|
| 131 |
|
|
fputs("# Vertex positions\n", fp); |
| 132 |
|
|
for (i = 0; i < sc->nverts; i++) |
| 133 |
|
|
fprintf(fp, "v %.12g %.12g %.12g\n", |
| 134 |
|
|
sc->vert[i].p[0], |
| 135 |
|
|
sc->vert[i].p[1], |
| 136 |
|
|
sc->vert[i].p[2]); |
| 137 |
|
|
fputs("\n# Vertex texture coordinates\n", fp); |
| 138 |
|
|
for (i = 0; i < sc->ntex; i++) |
| 139 |
|
|
fprintf(fp, "vt %.6g %.6g\n", |
| 140 |
|
|
sc->tex[i].u, sc->tex[i].v); |
| 141 |
|
|
fputs("\n# Vertex normals\n", fp); |
| 142 |
|
|
for (i = 0; i < sc->nnorms; i++) |
| 143 |
|
|
fprintf(fp, "vn %.6f %.6f %.6f\n", |
| 144 |
|
|
sc->norm[i][0], |
| 145 |
|
|
sc->norm[i][1], |
| 146 |
|
|
sc->norm[i][2]); |
| 147 |
|
|
fputc('\n', fp); |
| 148 |
|
|
} |
| 149 |
|
|
|
| 150 |
|
|
/* Write out an object group */ |
| 151 |
|
|
static void |
| 152 |
|
|
write_group(const Scene *sc, int gid, FILE *fp) |
| 153 |
|
|
{ |
| 154 |
|
|
int mid = -1; |
| 155 |
|
|
const Face *f; |
| 156 |
|
|
int j; |
| 157 |
|
|
|
| 158 |
|
|
fprintf(fp, "# Face group\ng %s\n", sc->grpname[gid]); |
| 159 |
|
|
for (f = sc->flist; f != NULL; f = f->next) { |
| 160 |
|
|
if (f->grp != gid) |
| 161 |
|
|
continue; |
| 162 |
|
|
if (f->mat != mid) |
| 163 |
|
|
fprintf(fp, "usemtl %s\n", sc->matname[mid=f->mat]); |
| 164 |
|
|
fputc('f', fp); |
| 165 |
|
|
for (j = 0; j < f->nv; j++) { |
| 166 |
|
|
fprintf(fp, " %d/", f->v[j].vid - sc->nverts); |
| 167 |
|
|
if (f->v[j].tid >= 0) |
| 168 |
|
|
fprintf(fp, "%d/", f->v[j].tid - sc->ntex); |
| 169 |
|
|
else |
| 170 |
|
|
fputc('/', fp); |
| 171 |
|
|
if (f->v[j].nid >= 0) |
| 172 |
|
|
fprintf(fp, "%d", f->v[j].nid - sc->nnorms); |
| 173 |
|
|
} |
| 174 |
|
|
fputc('\n', fp); |
| 175 |
|
|
} |
| 176 |
|
|
fprintf(fp, "# End of face group %s\n\n", sc->grpname[gid]); |
| 177 |
|
|
} |
| 178 |
|
|
|
| 179 |
|
|
/* Write a .OBJ to stream, return # faces written */ |
| 180 |
|
|
int |
| 181 |
|
|
toOBJ(Scene *sc, FILE *fp) |
| 182 |
|
|
{ |
| 183 |
|
|
int i; |
| 184 |
|
|
|
| 185 |
|
|
if (sc == NULL || sc->nfaces <= 0 || fp == NULL) |
| 186 |
|
|
return(0); |
| 187 |
|
|
if (verbose) |
| 188 |
|
|
fputs(" Removing unreferenced vertices\r", stderr); |
| 189 |
|
|
del_unref_verts(sc); /* clean up, first */ |
| 190 |
|
|
if (verbose) |
| 191 |
|
|
fputs(" Writing vertices \r", stderr); |
| 192 |
|
|
write_header(sc, fp); /* write out header */ |
| 193 |
|
|
write_verts(sc, fp); /* write out vertex lists */ |
| 194 |
|
|
/* write out each object group */ |
| 195 |
|
|
for (i = 0; i < sc->ngrps; i++) { |
| 196 |
|
|
if (verbose) |
| 197 |
greg |
2.4 |
fprintf(stderr, " Writing faces %-50s\r", |
| 198 |
greg |
2.1 |
sc->grpname[i]); |
| 199 |
|
|
write_group(sc, i, fp); |
| 200 |
|
|
} |
| 201 |
|
|
if (fflush(fp) < 0) { |
| 202 |
|
|
error(SYSTEM, "Error flushing .OBJ output"); |
| 203 |
|
|
return(-1); |
| 204 |
|
|
} |
| 205 |
greg |
2.4 |
if (verbose) |
| 206 |
|
|
fprintf(stderr, "Wrote %d faces \n", |
| 207 |
|
|
sc->nfaces); |
| 208 |
greg |
2.1 |
return(sc->nfaces); |
| 209 |
|
|
} |
| 210 |
|
|
|
| 211 |
|
|
/* Write a .OBJ file, return # faces written */ |
| 212 |
|
|
int |
| 213 |
|
|
writeOBJ(Scene *sc, const char *fspec) |
| 214 |
|
|
{ |
| 215 |
|
|
extern char *progname; |
| 216 |
|
|
FILE *fp; |
| 217 |
|
|
int n; |
| 218 |
|
|
|
| 219 |
|
|
if (sc == NULL || sc->nfaces <= 0 || fspec == NULL || !*fspec) |
| 220 |
|
|
return(0); |
| 221 |
|
|
#if POPEN_SUPPORT |
| 222 |
|
|
if (fspec[0] == '!') { |
| 223 |
|
|
if ((fp = popen(fspec+1, "w")) == NULL) { |
| 224 |
|
|
sprintf(errmsg, "%s: cannot execute", fspec); |
| 225 |
|
|
error(SYSTEM, errmsg); |
| 226 |
greg |
2.3 |
return(-1); |
| 227 |
greg |
2.1 |
} |
| 228 |
|
|
} else |
| 229 |
|
|
#endif |
| 230 |
|
|
if ((fp = fopen(fspec, "w")) == NULL) { |
| 231 |
|
|
sprintf(errmsg, "%s: cannot open for writing", fspec); |
| 232 |
|
|
error(SYSTEM, errmsg); |
| 233 |
greg |
2.3 |
return(-1); |
| 234 |
greg |
2.1 |
} |
| 235 |
|
|
/* start off header */ |
| 236 |
|
|
fprintf(fp, "# Wavefront .OBJ file created by %s\n#\n", progname); |
| 237 |
|
|
n = toOBJ(sc, fp); /* write scene */ |
| 238 |
|
|
#if POPEN_SUPPORT |
| 239 |
greg |
2.3 |
if (fspec[0] == '!') { |
| 240 |
|
|
if (pclose(fp)) { |
| 241 |
|
|
sprintf(errmsg, "%s: error writing to command\n", fspec); |
| 242 |
|
|
error(SYSTEM, errmsg); |
| 243 |
|
|
return(-1); |
| 244 |
|
|
} |
| 245 |
|
|
} else |
| 246 |
greg |
2.1 |
#endif |
| 247 |
greg |
2.3 |
fclose(fp); /* close it (already flushed) */ |
| 248 |
greg |
2.1 |
return(n); |
| 249 |
|
|
} |
