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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* Convert Pete Shirley's simple format to MGF */ |
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|
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#include <stdio.h> |
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|
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#define PI 3.14159265358979323846 |
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#define WHTEFFICACY 179.0 /* lumens/watt conversion factor */ |
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|
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#define FEQ(a,b) ((a)-(b) < 1e-4 && (a)-(b) > -1e-4) |
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|
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|
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main(argc, argv) /* input files are passed parameters */ |
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int argc; |
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char **argv; |
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{ |
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int i; |
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|
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if (argc == 1) |
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translate(NULL); |
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else |
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for (i = 1; i < argc; i++) |
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translate(argv[i]); |
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exit(0); |
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} |
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|
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|
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translate(fname) /* translate file fname */ |
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char *fname; |
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{ |
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FILE *fp; |
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register int c; |
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|
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if (fname == NULL) { |
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fname = "<stdin>"; |
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fp = stdin; |
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} else if ((fp = fopen(fname, "r")) == NULL) { |
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perror(fname); |
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exit(1); |
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} |
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while ((c = getc(fp)) != EOF) |
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switch (c) { |
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case ' ': /* white space */ |
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case '\t': |
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case '\n': |
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case '\f': |
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case '\r': |
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break; |
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case 'q': /* quad */ |
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doquad(fname, fp); |
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break; |
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case 's': /* sphere */ |
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dosphere(fname, fp); |
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break; |
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default: /* illegal */ |
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fprintf(stderr, "%s: illegal character (%d)\n", |
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fname, c); |
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exit(1); |
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} |
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} |
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|
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|
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doquad(fn, fp) /* translate quadrilateral */ |
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char *fn; |
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FILE *fp; |
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{ |
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double vert[3]; |
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register int i; |
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|
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for (i = 0; i < 4; i++) { |
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if (fscanf(fp, "%lf %lf %lf", &vert[0], |
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&vert[1], &vert[2]) != 3) { |
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fprintf(stderr, "%s: bad quad\n", fn); |
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exit(1); |
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} |
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printf("v qv%d =\n\tp %.9g %.9g %.9g\n", |
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i, vert[0], vert[1], vert[2]); |
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} |
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domat(fn, fp); |
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printf("f qv0 qv1 qv2 qv3\n"); |
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} |
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|
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|
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dosphere(fn, fp) /* translate sphere */ |
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char *fn; |
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FILE *fp; |
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{ |
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double cent[3], radius; |
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|
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if (fscanf(fp, "%lf %lf %lf %lf", ¢[0], ¢[1], |
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¢[2], &radius) != 4) { |
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fprintf(stderr, "%s: bad sphere\n", fn); |
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exit(1); |
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} |
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printf("v sc = \n\tp %.9g %.9g %.9g\n", |
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cent[0], cent[1], cent[2]); |
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domat(fn, fp); |
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printf("sph sc %.9g\n", radius); |
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} |
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|
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|
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domat(fn, fp) /* translate material */ |
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char *fn; |
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FILE *fp; |
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{ |
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static short curtype = 0; |
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static double curv1, curv2; |
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double d1, d2; |
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double f; |
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|
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nextchar: |
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switch(getc(fp)) { |
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case ' ': |
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case '\t': |
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case '\n': |
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case '\f': |
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case '\r': |
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goto nextchar; |
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case 'd': /* diffuse reflector */ |
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if (fscanf(fp, "%lf", &d1) != 1) |
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break; |
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if (curtype == 'd' && FEQ(d1, curv1)) |
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return; |
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curtype = 'd'; |
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curv1 = d1; |
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printf("m\n\tc\n"); |
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printf("\trd %.4f\n", d1); |
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return; |
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case 's': /* specular reflector */ |
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if (fscanf(fp, "%lf", &d1) != 1) |
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break; |
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if (curtype == 's' && FEQ(d1, curv1)) |
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return; |
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curtype = 's'; |
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curv1 = d1; |
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printf("m\n\tc\n"); |
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printf("\trs %.4f 0\n", d1); |
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return; |
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case 't': /* dielectric */ |
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if (fscanf(fp, "%lf", &d1) != 1) |
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break; |
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if (curtype == 't' && FEQ(d1, curv1)) |
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return; |
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curtype = 't'; |
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curv1 = d1; |
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printf("m\n\tc\n"); |
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printf("\tsides 1\n\tir %.3f 0\n", d1); |
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f = (1.0 - d1)/(1.0 + d1); |
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f *= f; |
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printf("\trs %.4f 0\n", f); |
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printf("\tts %.4f 0\n", 1.0-f); |
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return; |
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case 'l': /* light source */ |
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if (fscanf(fp, "%lf %lf", &d1, &d2) != 2) |
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break; |
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if (curtype == 'l' && FEQ(d1, curv1) && FEQ(d2, curv2)) |
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return; |
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curtype = 'l'; |
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curv1 = d1; |
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curv2 = d2; |
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printf("m\n\tc\n"); |
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printf("\tsides 1\n\trd %.4f\n\ted %.2f\n", |
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d1, PI*WHTEFFICACY*d2); |
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return; |
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} |
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fprintf(stderr, "%s: material format error\n", fn); |
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exit(1); |
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} |
