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#ifndef lint |
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static const char RCSid[] = "$Id: convertobj.c,v 2.5 2021/04/16 15:18:33 greg Exp $"; |
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#endif |
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/* |
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* convertobj.c |
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* |
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* Convert .OBJ scene to Radiance |
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* |
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* Created by Greg Ward on Thu Apr 22 2004. |
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*/ |
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|
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#include "paths.h" |
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#include "fvect.h" |
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#include "tmesh.h" |
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#include "rterror.h" |
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#include "objutil.h" |
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|
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#define TEXNAME "T-nor" |
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|
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static int fcnt = 0; /* face output counter */ |
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|
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/* Callback for face smoothing detection */ |
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static int |
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checksmooth(Scene *sc, Face *f, void *ptr) |
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{ |
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int nrev = 0; |
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Normal fnrm; |
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int i; |
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|
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f->flags &= ~FACE_RESERVED; /* using reserved flag */ |
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|
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for (i = f->nv; i--; ) |
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if (f->v[i].nid < 0) |
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return(0); /* missing normal */ |
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|
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if (faceArea(sc, f, fnrm) == 0) /* degenerate?? */ |
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return(0); |
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/* check each normal */ |
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for (i = f->nv; i--; ) { |
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float *tnrm = sc->norm[f->v[i].nid]; |
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double dprod = DOT(tnrm, fnrm); |
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if (dprod >= COSTOL) /* this one agrees? */ |
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continue; |
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if (dprod > -COSTOL) /* active smoothing? */ |
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break; |
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++nrev; /* count opposite face normal */ |
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} |
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if ((i < 0) & !nrev) /* all normals agree w/ face? */ |
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return(0); |
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if (nrev == f->nv) { /* all reversed? */ |
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for (i = f->nv/2; i--; ) { /* swap vertices around */ |
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int j = f->nv-1 - i; |
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VertEnt tve = f->v[i]; |
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f->v[i] = f->v[j]; |
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f->v[j] = tve; |
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} |
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return(0); |
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} |
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f->flags |= FACE_RESERVED; /* else we got one to smooth */ |
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return(1); |
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} |
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|
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/* Callback to write out smoothed Radiance triangle */ |
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static int |
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trismooth(Scene *sc, Face *f, void *ptr) |
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{ |
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FILE *fp = (FILE *)ptr; |
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BARYCCM bcm; |
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FVECT coor[3]; |
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int i; |
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|
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if (f->nv != 3) |
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return(0); /* should never happen */ |
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#ifdef SMLFLT |
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for (i = 3; i--; ) { |
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double *v = sc->vert[f->v[i].vid].p; |
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VCOPY(coor[i], v); |
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} |
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if (comp_baryc(&bcm, coor[0], coor[1], coor[2]) < 0) |
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return(0); /* degenerate?? */ |
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#else |
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if (comp_baryc(&bcm, sc->vert[f->v[0].vid].p, |
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sc->vert[f->v[1].vid].p, sc->vert[f->v[2].vid].p) < 0) |
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return(0); /* degenerate?? */ |
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#endif |
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for (i = 3; i--; ) { /* assign BC normals */ |
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float *tnrm = sc->norm[f->v[i].nid]; |
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coor[0][i] = tnrm[0]; |
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coor[1][i] = tnrm[1]; |
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coor[2][i] = tnrm[2]; |
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} /* print texture */ |
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fprintf(fp, "\n%s texfunc %s\n4 dx dy dz %s\n0\n", |
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sc->matname[f->mat], TEXNAME, TCALNAME); |
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fput_baryc(&bcm, coor, 3, fp); /* with BC normals */ |
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fprintf(fp, "\n%s polygon %s.%d\n0\n0\n9\n", |
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TEXNAME, sc->grpname[f->grp], ++fcnt); |
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for (i = 0; i < 3; i++) { /* then triangle */ |
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double *v = sc->vert[f->v[i].vid].p; |
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fprintf(fp, "\t%18.12g %18.12g %18.12g\n", v[0], v[1], v[2]); |
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} |
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return(1); |
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} |
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|
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/* Callback to convert face to Radiance */ |
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static int |
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radface(Scene *sc, Face *f, void *ptr) |
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{ |
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FILE *fp = (FILE *)ptr; |
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int i; |
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|
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fprintf(fp, "\n%s polygon %s.%d\n0\n0\n%d\n", sc->matname[f->mat], |
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sc->grpname[f->grp], ++fcnt, 3*f->nv); |
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for (i = 0; i < f->nv; i++) { |
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Vertex *vp = sc->vert + f->v[i].vid; |
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fprintf(fp, "\t%18.12g %18.12g %18.12g\n", |
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vp->p[0], vp->p[1], vp->p[2]); |
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} |
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return(1); |
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} |
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|
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/* Convert indicated faces to Radiance, return # written or -1 on error */ |
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int |
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toRadiance(Scene *sc, FILE *fp, int flreq, int flexc) |
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{ |
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int n; |
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|
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if (sc == NULL || sc->nfaces <= 0 || fp == NULL) |
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return(0); |
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/* not passing empties */ |
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flexc |= FACE_DEGENERATE; |
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/* reset counter if not stdout */ |
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fcnt *= (fp == stdout); |
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/* write comments */ |
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for (n = 0; n < sc->ndescr; n++) |
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fprintf(fp, "# %s\n", sc->descr[n]); |
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/* flag faces to smooth */ |
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n = foreachFace(sc, checksmooth, flreq, flexc, NULL); |
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if (n > 0) { /* write smooth faces */ |
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Scene *smoothies = dupScene(sc, flreq|FACE_RESERVED, flexc); |
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if (!smoothies) |
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return(-1); |
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n = triangulateScene(smoothies); |
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if (n >= 0) |
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n = foreachFace(smoothies, trismooth, 0, 0, fp); |
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freeScene(smoothies); |
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} |
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if (n < 0) |
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return(-1); |
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/* write flat faces */ |
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n += foreachFace(sc, radface, flreq, flexc|FACE_RESERVED, fp); |
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|
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if (fflush(fp) < 0) { |
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error(SYSTEM, "Error writing Radiance scene data"); |
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return(-1); |
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} |
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return(n); |
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} |
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|
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/* Convert faces to Radiance file, return # written or -1 on error */ |
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int |
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writeRadiance(Scene *sc, const char *fspec, int flreq, int flexc) |
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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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|
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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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return(-1); |
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} |
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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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return(-1); |
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} |
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/* start off header */ |
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fprintf(fp, "# Radiance scene file converted from .OBJ by %s\n#\n", |
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progname); |
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n = toRadiance(sc, fp, flreq, flexc); /* write file */ |
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#if POPEN_SUPPORT |
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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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#endif |
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fclose(fp); /* close it (already flushed) */ |
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return(n); |
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} |
