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#ifndef lint |
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static const char RCSid[] = "$Id: genrhgrid.c,v 3.11 2025/06/06 19:11:21 greg 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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|
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#include "platform.h" |
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#include "resolu.h" |
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#include "holo.h" |
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|
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char *mat, *name; /* material and object id */ |
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double rad; /* grid line radius */ |
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|
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static void gridsect(char *fname, int sect); |
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static void putgrid(HOLO *hp); |
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static void putline(FVECT wp[2]); |
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|
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|
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int |
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main( |
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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 sect; |
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|
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fixargv0(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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|
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|
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void |
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gridsect( /* 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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{ |
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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, "rb")) == 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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|
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|
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void |
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putgrid( /* run through holodeck section grid lines */ |
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HOLO *hp |
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) |
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{ |
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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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|
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|
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void |
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putline( /* put out a line */ |
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FVECT wp[2] |
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) |
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{ |
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static int cnt = 0; |
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|
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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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} |
