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#ifndef lint
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static const char RCSid[] = "$Id: genrhgrid.c,v 3.5 2003/07/27 22:12:02 schorsch Exp $";
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#endif
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/*
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* Generate renderable grids from a holodeck file
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*/
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#include "holo.h"
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#include "platform.h"
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char *progname; /* global argv[0] */
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char *mat, *name; /* material and object id */
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double rad; /* grid line radius */
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int sect;
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progname = argv[0];
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if ((argc < 5) | (argc > 6))
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goto userr;
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mat = argv[1];
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name = argv[2];
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rad = atof(argv[3]);
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sect = argc==5 ? -1 : atoi(argv[5]);
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fputs("# ", stdout);
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printargs(argc, argv, stdout);
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gridsect(argv[4], sect);
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quit(0);
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userr:
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fprintf(stderr, "Usage: %s mat name rad input.hdk [section]\n",
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progname);
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exit(1);
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}
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gridsect(fname, sect) /* get specified section(s) and print grids */
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char *fname;
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int sect;
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{
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FILE *fp;
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HOLO hdsect;
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int fd;
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int32 nextloc;
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int n;
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/* open holodeck file */
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if ((fp = fopen(fname, "r")) == NULL) {
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sprintf(errmsg, "cannot open \"%s\"", fname);
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error(SYSTEM, errmsg);
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}
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/* check header and magic number */
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if (checkheader(fp, HOLOFMT, NULL) < 0 || getw(fp) != HOLOMAGIC) {
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sprintf(errmsg, "file \"%s\" not in holodeck format", fname);
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error(USER, errmsg);
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}
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fd = dup(fileno(fp)); /* dup file handle */
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nextloc = ftell(fp); /* get stdio position */
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fclose(fp); /* done with stdio */
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for (n = 0; nextloc > 0L; n++) { /* get the section(s) */
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lseek(fd, (off_t)nextloc, SEEK_SET);
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read(fd, (char *)&nextloc, sizeof(nextloc));
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if ((sect < 0) | (n == sect)) {
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read(fd, (char *)&hdsect, sizeof(HDGRID));
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hdcompgrid(&hdsect);
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putgrid(&hdsect); /* print grid */
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}
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}
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}
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putgrid(hp) /* run through holodeck section grid lines */
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register HOLO *hp;
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{
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register int w, i;
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int g0, g1;
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FVECT wp[2], mov;
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double d;
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/* do each wall on this section */
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for (w = 0; w < 6; w++) {
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g0 = hdwg0[w];
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g1 = hdwg1[w];
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d = 1.0/hp->grid[g0];
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mov[0] = d * hp->xv[g0][0];
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mov[1] = d * hp->xv[g0][1];
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mov[2] = d * hp->xv[g0][2];
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if (w & 1) {
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VSUM(wp[0], hp->orig, hp->xv[w>>1], 1.);
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VSUM(wp[0], wp[0], mov, 1.);
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} else
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VCOPY(wp[0], hp->orig);
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VSUM(wp[1], wp[0], hp->xv[g1], 1.);
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for (i = hp->grid[g0]; ; ) { /* g0 lines */
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putline(wp);
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if (!--i) break;
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wp[0][0] += mov[0]; wp[0][1] += mov[1];
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wp[0][2] += mov[2]; wp[1][0] += mov[0];
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wp[1][1] += mov[1]; wp[1][2] += mov[2];
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}
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d = 1.0/hp->grid[g1];
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mov[0] = d * hp->xv[g1][0];
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mov[1] = d * hp->xv[g1][1];
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mov[2] = d * hp->xv[g1][2];
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if (w & 1)
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VSUM(wp[0], hp->orig, hp->xv[w>>1], 1.);
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else
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VSUM(wp[0], hp->orig, mov, 1.);
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VSUM(wp[1], wp[0], hp->xv[g0], 1.);
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for (i = hp->grid[g1]; ; ) { /* g1 lines */
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putline(wp);
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if (!--i) break;
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wp[0][0] += mov[0]; wp[0][1] += mov[1];
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wp[0][2] += mov[2]; wp[1][0] += mov[0];
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wp[1][1] += mov[1]; wp[1][2] += mov[2];
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}
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}
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}
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putline(wp) /* put out a line */
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register FVECT wp[2];
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{
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static int cnt = 0;
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printf("\n%s cylinder %s.%d\n0\n0\n7\n", mat, name, ++cnt);
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printf("\t%.4e %.4e %.4e\n", wp[0][0], wp[0][1], wp[0][2]);
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printf("\t%.4e %.4e %.4e\n", wp[1][0], wp[1][1], wp[1][2]);
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printf("\t%.4e\n", rad);
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}
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