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#ifndef lint
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static const char RCSid[] = "$Id: obj2mesh.c,v 2.7 2003/07/14 05:00:45 greg Exp $";
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#endif
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/*
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* Main program to compile a Wavefront .OBJ file into a Radiance mesh
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*/
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#include "copyright.h"
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#include "platform.h"
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#include "standard.h"
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#include "resolu.h"
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#include "cvmesh.h"
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#include "otypes.h"
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extern int o_face(); /* XXX should go to a header file */
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int o_default() { return(O_MISS); }
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FUN ofun[NUMOTYPE] = INIT_OTYPE; /* needed for link resolution */
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char *progname; /* argv[0] */
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int nowarn = 0; /* supress warnings? */
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int objlim = 15; /* # of objects before split */
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int resolu = 16384; /* octree resolution limit */
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double mincusize; /* minimum cube size from resolu */
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static void addface(CUBE *cu, OBJECT obj);
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static void add2full(CUBE *cu, OBJECT obj);
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int
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main( /* compile a .OBJ file into a mesh */
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int argc,
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char *argv[]
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)
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{
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int nmatf = 0;
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char *matinp[32];
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int i, j;
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progname = argv[0];
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ofun[OBJ_FACE].funp = o_face;
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for (i = 1; i < argc && argv[i][0] == '-'; i++)
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switch (argv[i][1]) {
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case 'n': /* set limit */
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objlim = atoi(argv[++i]);
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break;
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case 'r': /* resolution limit */
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resolu = atoi(argv[++i]);
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break;
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case 'a': /* material file */
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matinp[nmatf++] = argv[++i];
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break;
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case 'w': /* supress warnings */
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nowarn = 1;
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break;
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default:
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sprintf(errmsg, "unknown option: '%s'", argv[i]);
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error(USER, errmsg);
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break;
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}
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if (i < argc-2)
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error(USER, "too many file arguments");
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/* initialize mesh */
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cvinit(i==argc-2 ? argv[i+1] : "<stdout>");
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/* load material input */
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for (j = 0; j < nmatf; j++)
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readobj(matinp[j]);
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/* read .OBJ file into triangles */
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if (i == argc)
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wfreadobj(NULL);
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else
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wfreadobj(argv[i]);
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cvmeshbounds(); /* set octree boundaries */
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if (i == argc-2) /* open output file */
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if (freopen(argv[i+1], "w", stdout) == NULL)
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error(SYSTEM, "cannot open output file");
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SET_FILE_BINARY(stdout);
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newheader("RADIANCE", stdout); /* new binary file header */
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printargs(i<argc ? i+1 : argc, argv, stdout);
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fputformat(MESHFMT, stdout);
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fputc('\n', stdout);
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mincusize = ourmesh->mcube.cusize / resolu - FTINY;
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for (i = 0; i < nobjects; i++) /* add triangles to octree */
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if (objptr(i)->otype == OBJ_FACE)
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addface(&ourmesh->mcube, i);
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/* optimize octree */
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ourmesh->mcube.cutree = combine(ourmesh->mcube.cutree);
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if (ourmesh->mcube.cutree == EMPTY)
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error(WARNING, "mesh is empty");
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cvmesh(); /* convert mesh and leaf nodes */
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writemesh(ourmesh, stdout); /* write mesh to output */
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/* printmeshstats(ourmesh, stderr); */
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quit(0);
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return 0; /* pro forma return */
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}
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void
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quit( /* exit program */
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int code
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)
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{
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exit(code);
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}
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void
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cputs(void) /* interactive error */
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{
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/* referenced, but not used */
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}
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void
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wputs( /* warning message */
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char *s
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)
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{
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if (!nowarn)
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eputs(s);
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}
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void
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eputs( /* put string to stderr */
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register char *s
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)
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{
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static int inln = 0;
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if (!inln++) {
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fputs(progname, stderr);
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fputs(": ", stderr);
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}
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fputs(s, stderr);
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if (*s && s[strlen(s)-1] == '\n')
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inln = 0;
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}
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static void
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addface( /* add a face to a cube */
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register CUBE *cu,
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OBJECT obj
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)
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{
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if (o_face(objptr(obj), cu) == O_MISS)
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return;
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if (istree(cu->cutree)) {
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CUBE cukid; /* do children */
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int i, j;
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cukid.cusize = cu->cusize * 0.5;
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for (i = 0; i < 8; i++) {
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cukid.cutree = octkid(cu->cutree, i);
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for (j = 0; j < 3; j++) {
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cukid.cuorg[j] = cu->cuorg[j];
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if ((1<<j) & i)
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cukid.cuorg[j] += cukid.cusize;
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}
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addface(&cukid, obj);
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octkid(cu->cutree, i) = cukid.cutree;
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}
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return;
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}
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if (isempty(cu->cutree)) {
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OBJECT oset[2]; /* singular set */
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oset[0] = 1; oset[1] = obj;
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cu->cutree = fullnode(oset);
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return;
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}
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/* add to full node */
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add2full(cu, obj);
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}
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static void
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add2full( /* add object to full node */
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register CUBE *cu,
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OBJECT obj
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)
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{
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OCTREE ot;
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OBJECT oset[MAXSET+1];
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CUBE cukid;
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register int i, j;
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objset(oset, cu->cutree);
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cukid.cusize = cu->cusize * 0.5;
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if (oset[0] < objlim || cukid.cusize < mincusize) {
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/* add to set */
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if (oset[0] >= MAXSET) {
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sprintf(errmsg, "set overflow in addobject (%s)",
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objptr(obj)->oname);
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error(INTERNAL, errmsg);
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}
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insertelem(oset, obj);
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cu->cutree = fullnode(oset);
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return;
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}
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/* subdivide cube */
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if ((ot = octalloc()) == EMPTY)
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error(SYSTEM, "out of octree space");
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/* assign subcubes */
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for (i = 0; i < 8; i++) {
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cukid.cutree = EMPTY;
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for (j = 0; j < 3; j++) {
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cukid.cuorg[j] = cu->cuorg[j];
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if ((1<<j) & i)
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cukid.cuorg[j] += cukid.cusize;
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}
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for (j = 1; j <= oset[0]; j++)
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addface(&cukid, oset[j]);
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addface(&cukid, obj);
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/* returned node */
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octkid(ot, i) = cukid.cutree;
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}
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cu->cutree = ot;
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}
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