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#ifndef lint |
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static const char RCSid[] = "$Id: obj2mesh.c,v 2.17 2023/02/06 22:40:21 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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|
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#include "copyright.h" |
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#include "paths.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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|
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extern int o_face(); /* XXX should go to a header file */ |
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|
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int o_default() { return(O_MISS); } |
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|
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FUN ofun[NUMOTYPE] = INIT_OTYPE; /* needed for link resolution */ |
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|
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int nowarn = 0; /* supress warnings? */ |
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|
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int objlim = 9; /* # of objects before split */ |
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|
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int resolu = 16384; /* octree resolution limit */ |
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|
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double mincusize; /* minimum cube size from resolu */ |
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|
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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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|
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|
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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 verbose = 0; |
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char *cp; |
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int i, j; |
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|
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fixargv0(argv[0]); /* sets global progname */ |
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|
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ofun[OBJ_FACE].funp = o_face; |
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|
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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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readobj(argv[++i]); |
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break; |
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case 'l': /* library material */ |
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cp = getpath(argv[++i], getrlibpath(), R_OK); |
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if (cp == NULL) { |
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sprintf(errmsg, |
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"cannot find library material: '%s'", |
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argv[i]); |
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error(SYSTEM, errmsg); |
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} |
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readobj(cp); |
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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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case 'v': /* print mesh stats */ |
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verbose = 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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|
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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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/* 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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|
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cvmeshbounds(); /* set octree boundaries */ |
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|
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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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|
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mincusize = ourmesh->mcube.cusize / resolu - FTINY; |
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|
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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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|
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/* optimize octree */ |
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ourmesh->mcube.cutree = combine(ourmesh->mcube.cutree); |
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|
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if (ourmesh->mcube.cutree == EMPTY) |
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error(WARNING, "mesh is empty"); |
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|
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cvmesh(); /* convert mesh and leaf nodes */ |
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|
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writemesh(ourmesh, stdout); /* write mesh to output */ |
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|
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if (verbose) |
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printmeshstats(ourmesh, stderr); |
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|
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quit(0); |
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return 0; /* pro forma return */ |
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} |
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|
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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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|
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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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|
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|
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void |
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wputs( /* warning message */ |
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const 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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|
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|
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void |
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eputs( /* put string to stderr */ |
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const char *s |
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) |
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{ |
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static int inln = 0; |
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|
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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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|
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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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CUBE *cu, |
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OBJECT obj |
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) |
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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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|
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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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|
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|
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static void |
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add2full( /* add object to full node */ |
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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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int i, j; |
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|
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objset(oset, cu->cutree); |
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cukid.cusize = cu->cusize * 0.5; |
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|
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if (oset[0] < objlim || cukid.cusize < |
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(oset[0] < MAXSET ? mincusize : mincusize/256.0)) { |
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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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} |
