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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* Replace markers in Radiance scene description with objects or instances. |
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* |
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* Created: 17 Feb 1991 Greg Ward |
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*/ |
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|
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#include <stdio.h> |
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#include <ctype.h> |
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#include <math.h> |
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|
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#include "fvect.h" |
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|
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#ifdef M_PI |
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#define PI M_PI |
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#else |
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#define PI 3.14159265358979323846 |
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#endif |
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|
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#define MAXVERT 6 /* maximum number of vertices for markers */ |
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|
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typedef struct { |
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short beg, end; /* beginning and ending vertex */ |
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float len2; /* length squared */ |
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} EDGE; /* a marker edge */ |
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|
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int expand = 0; /* expand commands? */ |
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|
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char *modout = "void"; /* output modifier (for instances) */ |
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|
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double markscale = 0.0; /* scale markers by this to get unit */ |
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|
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char *modin = NULL; /* input modifier indicating marker */ |
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|
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char *objname = NULL; /* output object file (octree if instance) */ |
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int doxform; /* true if xform, false if instance */ |
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|
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char *progname; |
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|
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|
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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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FILE *fp; |
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int i, j; |
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|
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progname = argv[0]; |
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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 'i': |
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doxform = 0; |
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objname = argv[++i]; |
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break; |
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case 'x': |
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doxform = 1; |
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objname = argv[++i]; |
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break; |
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case 'e': |
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expand = !expand; |
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break; |
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case 'm': |
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modout = argv[++i]; |
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break; |
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case 's': |
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markscale = atof(argv[++i]); |
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break; |
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default: |
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goto userr; |
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} |
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if (i < argc) |
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modin = argv[i++]; |
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if (objname == NULL || modin == NULL) |
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goto userr; |
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/* simple header */ |
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putchar('#'); |
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for (j = 0; j < i; j++) { |
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putchar(' '); |
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fputs(argv[j], stdout); |
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} |
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putchar('\n'); |
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if (i == argc) |
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convert("<stdin>", stdin); |
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else |
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for ( ; i < argc; i++) { |
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if ((fp = fopen(argv[i], "r")) == NULL) { |
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perror(argv[i]); |
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exit(1); |
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} |
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convert(argv[i], fp); |
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fclose(fp); |
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} |
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exit(0); |
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userr: |
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fprintf(stderr, |
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"Usage: %s [-e][-s size][-m modout] {-x objfile|-i octree} modname [file ..]\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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convert(name, fin) /* replace marks in a stream */ |
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char *name; |
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register FILE *fin; |
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{ |
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register int c; |
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|
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while ((c = getc(fin)) != EOF) { |
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if (isspace(c)) /* blank */ |
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continue; |
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if (c == '#') { /* comment */ |
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putchar(c); |
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do { |
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if ((c = getc(fin)) == EOF) |
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return; |
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putchar(c); |
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} while (c != '\n'); |
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} else if (c == '!') { /* command */ |
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ungetc(c, fin); |
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cvcomm(name, fin); |
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} else { /* object */ |
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ungetc(c, fin); |
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cvobject(name, fin); |
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} |
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} |
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} |
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|
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|
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cvcomm(fname, fin) /* convert a command */ |
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char *fname; |
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FILE *fin; |
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{ |
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FILE *pin, *popen(); |
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char buf[512], *fgetline(); |
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|
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fgetline(buf, sizeof(buf), fin); |
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if (expand) { |
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if ((pin = popen(buf+1, "r")) == NULL) { |
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fprintf(stderr, |
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"%s: (%s): cannot execute \"%s\"\n", |
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progname, fname, buf); |
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exit(1); |
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} |
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convert(buf, pin); |
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pclose(pin); |
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} else |
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printf("\n%s\n", buf); |
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} |
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|
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|
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cvobject(fname, fin) /* convert an object */ |
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char *fname; |
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FILE *fin; |
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{ |
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char buf[128], typ[16], nam[128]; |
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int i, j, n; |
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|
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if (fscanf(fin, "%s %s %s", buf, typ, nam) != 3) |
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goto readerr; |
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if (!strcmp(buf, modin) && !strcmp(typ, "polygon")) { |
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replace(fname, nam, fin); |
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return; |
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} |
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printf("\n%s %s %s\n", buf, typ, nam); |
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if (!strcmp(typ, "alias")) { /* alias special case */ |
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if (fscanf(fin, "%s", buf) != 1) |
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goto readerr; |
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printf("\t%s\n", buf); |
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return; |
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} |
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for (i = 0; i < 3; i++) { /* pass along arguments */ |
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if (fscanf(fin, "%d", &n) != 1) |
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goto readerr; |
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printf("%d", n); |
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for (j = 0; j < n; j++) { |
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if (fscanf(fin, "%s", buf) != 1) |
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goto readerr; |
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if (j%3 == 0) |
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putchar('\n'); |
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printf("\t%s", buf); |
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} |
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putchar('\n'); |
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} |
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return; |
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readerr: |
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fprintf(stderr, "%s: (%s): read error for %s \"%s\"\n", |
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progname, fname, typ, nam); |
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} |
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|
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|
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replace(fname, mark, fin) /* replace marker */ |
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char *fname, *mark; |
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FILE *fin; |
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{ |
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int n; |
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char buf[256]; |
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|
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if (doxform) { |
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sprintf(buf, "xform -e -n %s", mark); |
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if (buildxf(buf+strlen(buf), fin) < 0) |
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goto badxf; |
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sprintf(buf+strlen(buf), " %s", objname); |
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if (expand) { |
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fflush(stdout); |
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system(buf); |
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} else |
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printf("\n!%s\n", buf); |
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} else { |
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if ((n = buildxf(buf, fin)) < 0) |
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goto badxf; |
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printf("\n%s instance %s\n", modout, mark); |
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printf("%d %s%s\n", n+1, objname, buf); |
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printf("\n0\n0\n"); |
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} |
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return; |
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badxf: |
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fprintf(stderr, "%s: (%s): bad arguments for marker \"%s\"\n", |
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progname, fname, mark); |
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exit(1); |
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} |
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|
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|
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edgecmp(e1, e2) /* compare two edges, descending order */ |
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EDGE *e1, *e2; |
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{ |
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if (e1->len2 > e2->len2) |
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return(-1); |
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if (e1->len2 < e2->len2) |
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return(1); |
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return(0); |
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} |
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|
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|
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int |
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buildxf(xf, fin) /* build transform for marker */ |
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char *xf; |
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FILE *fin; |
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{ |
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static FVECT vlist[MAXVERT]; |
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static EDGE elist[MAXVERT]; |
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FVECT xvec, yvec, zvec; |
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double xlen; |
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int n; |
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register int i; |
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/* |
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* Read and sort vectors: longest is hypotenuse, |
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* second longest is x' axis, |
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* third longest is y' axis (approximate), |
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* other vectors are ignored. |
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* It is an error if the x' and y' axes do |
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* not share a common vertex (their origin). |
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*/ |
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if (fscanf(fin, "%*d %*d %d", &n) != 1) |
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return(-1); |
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if (n%3 != 0) |
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return(-1); |
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n /= 3; |
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if (n < 3 || n > MAXVERT) |
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return(-1); |
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/* sort edges in descending order */ |
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for (i = 0; i < n; i++) { |
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if (fscanf(fin, "%lf %lf %lf", &vlist[i][0], |
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&vlist[i][1], &vlist[i][2]) != 3) |
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return(-1); |
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if (i) { |
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elist[i].beg = i-1; |
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elist[i].end = i; |
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elist[i].len2 = dist2(vlist[i-1],vlist[i]); |
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} |
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} |
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elist[0].beg = n-1; |
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elist[0].end = 0; |
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elist[0].len2 = dist2(vlist[n-1],vlist[0]); |
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qsort(elist, n, sizeof(EDGE), edgecmp); |
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/* find x' and y' */ |
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if (elist[1].end == elist[2].beg || elist[1].end == elist[2].end) { |
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i = elist[1].beg; |
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elist[1].beg = elist[1].end; |
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elist[1].end = i; |
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} |
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if (elist[2].end == elist[1].beg) { |
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i = elist[2].beg; |
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elist[2].beg = elist[2].end; |
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elist[2].end = i; |
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} |
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if (elist[1].beg != elist[2].beg) |
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return(-1); /* x' and y' not connected! */ |
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for (i = 0; i < 3; i++) { |
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xvec[i] = vlist[elist[1].end][i] - vlist[elist[1].beg][i]; |
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yvec[i] = vlist[elist[2].end][i] - vlist[elist[2].beg][i]; |
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} |
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if ((xlen = normalize(xvec)) == 0.0) |
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return(-1); |
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fcross(zvec, xvec, yvec); |
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if (normalize(zvec) == 0.0) |
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return(-1); |
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fcross(yvec, zvec, xvec); |
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n = 0; /* start transformation... */ |
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if (markscale > 0.0) { /* add scale factor */ |
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sprintf(xf, " -s %f", xlen*markscale); |
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n += 2; |
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xf += strlen(xf); |
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} |
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/* add rotation */ |
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n += addrot(xf, xvec, yvec, zvec); |
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xf += strlen(xf); |
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/* add translation */ |
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n += 4; |
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sprintf(xf, " -t %f %f %f", vlist[elist[1].beg][0], |
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vlist[elist[1].beg][1], vlist[elist[1].beg][2]); |
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return(n); /* all done */ |
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} |
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|
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|
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addrot(xf, xp, yp, zp) /* compute rotation (x,y,z) => (xp,yp,zp) */ |
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char *xf; |
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FVECT xp, yp, zp; |
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{ |
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double tx, ty, tz; |
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|
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tx = atan2(yp[2], zp[2]); |
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ty = asin(-xp[2]); |
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tz = atan2(xp[1], xp[0]); |
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sprintf(xf, " -rx %f -ry %f -rz %f", tx*(180./PI), |
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ty*(180./PI), tz*(180./PI)); |
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return(6); |
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} |
