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greg |
2.1 |
#ifndef lint
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greg |
2.5 |
static const char RCSid[] = "$Id: writewfobj.c,v 2.4 2020/12/18 00:15:47 greg Exp $";
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greg |
2.1 |
#endif
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/*
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* writewfobj.c
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*
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* Routines for writing out Wavefront file.
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*
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* Created by Greg Ward on Thu Feb 12 2004.
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*/
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greg |
2.2 |
#include "paths.h"
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greg |
2.1 |
#include "rterror.h"
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#include "objutil.h"
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/* Write out header comments */
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static void
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write_header(Scene *sc, FILE *fp)
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{
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int i;
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for (i = 0; i < sc->ndescr; i++)
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fprintf(fp, "# %s\n", sc->descr[i]);
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fputs("#\n", fp);
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fprintf(fp, "# %d final faces\n", sc->nfaces);
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fprintf(fp,
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"#\t%d vertices, %d texture coordinates, %d surface normals\n",
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sc->nverts, sc->ntex, sc->nnorms);
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fputs("#\n\n", fp);
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}
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/* Write out vertex lists */
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static void
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write_verts(Scene *sc, FILE *fp)
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{
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int i;
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fputs("# Vertex positions\n", fp);
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for (i = 0; i < sc->nverts; i++)
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fprintf(fp, "v %.12g %.12g %.12g\n",
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sc->vert[i].p[0],
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sc->vert[i].p[1],
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sc->vert[i].p[2]);
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fputs("\n# Vertex texture coordinates\n", fp);
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for (i = 0; i < sc->ntex; i++)
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fprintf(fp, "vt %.6g %.6g\n",
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sc->tex[i].u, sc->tex[i].v);
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fputs("\n# Vertex normals\n", fp);
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for (i = 0; i < sc->nnorms; i++)
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fprintf(fp, "vn %.6f %.6f %.6f\n",
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sc->norm[i][0],
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sc->norm[i][1],
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sc->norm[i][2]);
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fputc('\n', fp);
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}
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/* Write out an object group */
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static void
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write_group(const Scene *sc, int gid, FILE *fp)
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{
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int mid = -1;
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const Face *f;
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int j;
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fprintf(fp, "# Face group\ng %s\n", sc->grpname[gid]);
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for (f = sc->flist; f != NULL; f = f->next) {
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if (f->grp != gid)
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continue;
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if (f->mat != mid)
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fprintf(fp, "usemtl %s\n", sc->matname[mid=f->mat]);
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fputc('f', fp);
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for (j = 0; j < f->nv; j++) {
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fprintf(fp, " %d/", f->v[j].vid - sc->nverts);
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if (f->v[j].tid >= 0)
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fprintf(fp, "%d/", f->v[j].tid - sc->ntex);
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else
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fputc('/', fp);
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if (f->v[j].nid >= 0)
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fprintf(fp, "%d", f->v[j].nid - sc->nnorms);
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}
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fputc('\n', fp);
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}
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fprintf(fp, "# End of face group %s\n\n", sc->grpname[gid]);
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}
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/* Write a .OBJ to stream, return # faces written */
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int
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toOBJ(Scene *sc, FILE *fp)
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{
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int i;
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if (sc == NULL || sc->nfaces <= 0 || fp == NULL)
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return(0);
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if (verbose)
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fputs(" Removing unreferenced vertices\r", stderr);
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greg |
2.5 |
deleteUnreferenced(sc); /* clean up, first */
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greg |
2.1 |
if (verbose)
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fputs(" Writing vertices \r", stderr);
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write_header(sc, fp); /* write out header */
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write_verts(sc, fp); /* write out vertex lists */
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/* write out each object group */
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for (i = 0; i < sc->ngrps; i++) {
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if (verbose)
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greg |
2.4 |
fprintf(stderr, " Writing faces %-50s\r",
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greg |
2.1 |
sc->grpname[i]);
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write_group(sc, i, fp);
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}
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if (fflush(fp) < 0) {
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error(SYSTEM, "Error flushing .OBJ output");
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return(-1);
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}
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greg |
2.4 |
if (verbose)
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fprintf(stderr, "Wrote %d faces \n",
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sc->nfaces);
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greg |
2.1 |
return(sc->nfaces);
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}
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/* Write a .OBJ file, return # faces written */
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int
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writeOBJ(Scene *sc, const char *fspec)
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{
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extern char *progname;
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FILE *fp;
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int n;
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if (sc == NULL || sc->nfaces <= 0 || fspec == NULL || !*fspec)
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return(0);
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#if POPEN_SUPPORT
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if (fspec[0] == '!') {
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if ((fp = popen(fspec+1, "w")) == NULL) {
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sprintf(errmsg, "%s: cannot execute", fspec);
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error(SYSTEM, errmsg);
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greg |
2.3 |
return(-1);
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greg |
2.1 |
}
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} else
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#endif
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if ((fp = fopen(fspec, "w")) == NULL) {
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sprintf(errmsg, "%s: cannot open for writing", fspec);
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error(SYSTEM, errmsg);
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greg |
2.3 |
return(-1);
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greg |
2.1 |
}
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/* start off header */
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fprintf(fp, "# Wavefront .OBJ file created by %s\n#\n", progname);
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n = toOBJ(sc, fp); /* write scene */
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#if POPEN_SUPPORT
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greg |
2.3 |
if (fspec[0] == '!') {
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if (pclose(fp)) {
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sprintf(errmsg, "%s: error writing to command\n", fspec);
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error(SYSTEM, errmsg);
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return(-1);
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}
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} else
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greg |
2.1 |
#endif
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greg |
2.3 |
fclose(fp); /* close it (already flushed) */
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greg |
2.1 |
return(n);
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}
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