| 1 |
/* Copyright (c) 1996 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Convert MGF (Materials and Geometry Format) to Radiance |
| 9 |
*/ |
| 10 |
|
| 11 |
#include <stdio.h> |
| 12 |
#include <math.h> |
| 13 |
#include <string.h> |
| 14 |
#include "mgflib/parser.h" |
| 15 |
#include "color.h" |
| 16 |
#include "tmesh.h" |
| 17 |
|
| 18 |
#define putv(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
| 19 |
|
| 20 |
#define invert (xf_context != NULL && xf_context->rev) |
| 21 |
|
| 22 |
double glowdist = FHUGE; /* glow test distance */ |
| 23 |
|
| 24 |
double emult = 1.; /* emitter multiplier */ |
| 25 |
|
| 26 |
FILE *matfp = stdout; /* material output file */ |
| 27 |
|
| 28 |
int r_comment(), r_cone(), r_cyl(), r_face(), r_ies(), r_ring(), r_sph(); |
| 29 |
char *material(), *object(), *addarg(); |
| 30 |
|
| 31 |
|
| 32 |
main(argc, argv) /* convert files to stdout */ |
| 33 |
int argc; |
| 34 |
char *argv[]; |
| 35 |
{ |
| 36 |
int i; |
| 37 |
/* print out parser version */ |
| 38 |
printf("## Translated from MGF Version %d.%d\n", MG_VMAJOR, MG_VMINOR); |
| 39 |
/* initialize dispatch table */ |
| 40 |
mg_ehand[MG_E_COMMENT] = r_comment; /* we pass comments */ |
| 41 |
mg_ehand[MG_E_COLOR] = c_hcolor; /* they get color */ |
| 42 |
mg_ehand[MG_E_CONE] = r_cone; /* we do cones */ |
| 43 |
mg_ehand[MG_E_CMIX] = c_hcolor; /* they mix colors */ |
| 44 |
mg_ehand[MG_E_CSPEC] = c_hcolor; /* they get spectra */ |
| 45 |
mg_ehand[MG_E_CXY] = c_hcolor; /* they get chromaticities */ |
| 46 |
mg_ehand[MG_E_CCT] = c_hcolor; /* they get color temp's */ |
| 47 |
mg_ehand[MG_E_CYL] = r_cyl; /* we do cylinders */ |
| 48 |
mg_ehand[MG_E_ED] = c_hmaterial; /* they get emission */ |
| 49 |
mg_ehand[MG_E_FACE] = r_face; /* we do faces */ |
| 50 |
mg_ehand[MG_E_IES] = r_ies; /* we do IES files */ |
| 51 |
mg_ehand[MG_E_IR] = c_hmaterial; /* they get refractive index */ |
| 52 |
mg_ehand[MG_E_MATERIAL] = c_hmaterial; /* they get materials */ |
| 53 |
mg_ehand[MG_E_NORMAL] = c_hvertex; /* they get normals */ |
| 54 |
mg_ehand[MG_E_OBJECT] = obj_handler; /* they track object names */ |
| 55 |
mg_ehand[MG_E_POINT] = c_hvertex; /* they get points */ |
| 56 |
mg_ehand[MG_E_RD] = c_hmaterial; /* they get diffuse refl. */ |
| 57 |
mg_ehand[MG_E_RING] = r_ring; /* we do rings */ |
| 58 |
mg_ehand[MG_E_RS] = c_hmaterial; /* they get specular refl. */ |
| 59 |
mg_ehand[MG_E_SIDES] = c_hmaterial; /* they get # sides */ |
| 60 |
mg_ehand[MG_E_SPH] = r_sph; /* we do spheres */ |
| 61 |
mg_ehand[MG_E_TD] = c_hmaterial; /* they get diffuse trans. */ |
| 62 |
mg_ehand[MG_E_TS] = c_hmaterial; /* they get specular trans. */ |
| 63 |
mg_ehand[MG_E_VERTEX] = c_hvertex; /* they get vertices */ |
| 64 |
mg_ehand[MG_E_XF] = xf_handler; /* they track transforms */ |
| 65 |
mg_init(); /* initialize the parser */ |
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/* get our options & print header */ |
| 67 |
printf("## %s", argv[0]); |
| 68 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
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printf(" %s", argv[i]); |
| 70 |
switch (argv[i][1]) { |
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case 'g': /* glow distance (meters) */ |
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if (argv[i][2] || badarg(argc-i-1, argv+i+1, "f")) |
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goto userr; |
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glowdist = atof(argv[++i]); |
| 75 |
printf(" %s", argv[i]); |
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break; |
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case 'e': /* emitter multiplier */ |
| 78 |
if (argv[i][2] || badarg(argc-i-1, argv+i+1, "f")) |
| 79 |
goto userr; |
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emult = atof(argv[++i]); |
| 81 |
printf(" %s", argv[i]); |
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break; |
| 83 |
case 'm': /* materials file */ |
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matfp = fopen(argv[++i], "a"); |
| 85 |
if (matfp == NULL) { |
| 86 |
fprintf(stderr, "%s: cannot append\n", argv[i]); |
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exit(1); |
| 88 |
} |
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printf(" %s", argv[i]); |
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break; |
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default: |
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goto userr; |
| 93 |
} |
| 94 |
} |
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putchar('\n'); |
| 96 |
if (i == argc) { /* convert stdin */ |
| 97 |
if (mg_load(NULL) != MG_OK) |
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exit(1); |
| 99 |
if (mg_nunknown) |
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printf("## %s: %u unknown entities\n", |
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argv[0], mg_nunknown); |
| 102 |
} else /* convert each file */ |
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for ( ; i < argc; i++) { |
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printf("## %s %s ##############################\n", |
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argv[0], argv[i]); |
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if (mg_load(argv[i]) != MG_OK) |
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exit(1); |
| 108 |
if (mg_nunknown) { |
| 109 |
printf("## %s %s: %u unknown entities\n", |
| 110 |
argv[0], argv[i], mg_nunknown); |
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mg_nunknown = 0; |
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} |
| 113 |
} |
| 114 |
exit(0); |
| 115 |
userr: |
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fprintf(stderr, "Usage: %s [-g dist][-e mult][-m matf] [file.mgf] ..\n", |
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argv[0]); |
| 118 |
exit(1); |
| 119 |
} |
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|
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|
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int |
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r_comment(ac, av) /* repeat a comment verbatim */ |
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register int ac; |
| 125 |
register char **av; |
| 126 |
{ |
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putchar('#'); /* use Radiance comment character */ |
| 128 |
while (--ac) { /* pass through verbatim */ |
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putchar(' '); |
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fputs(*++av, stdout); |
| 131 |
} |
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putchar('\n'); |
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return(MG_OK); |
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} |
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|
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|
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int |
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r_cone(ac, av) /* put out a cone */ |
| 139 |
int ac; |
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char **av; |
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{ |
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static int ncones; |
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char *mat; |
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double r1, r2; |
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C_VERTEX *cv1, *cv2; |
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FVECT p1, p2; |
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int inv; |
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/* check argument count and type */ |
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if (ac != 5) |
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return(MG_EARGC); |
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if (!isflt(av[2]) || !isflt(av[4])) |
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return(MG_ETYPE); |
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/* get the endpoint vertices */ |
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if ((cv1 = c_getvert(av[1])) == NULL || |
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(cv2 = c_getvert(av[3])) == NULL) |
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return(MG_EUNDEF); |
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xf_xfmpoint(p1, cv1->p); /* transform endpoints */ |
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xf_xfmpoint(p2, cv2->p); |
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r1 = xf_scale(atof(av[2])); /* scale radii */ |
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r2 = xf_scale(atof(av[4])); |
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inv = r1 < 0.; /* check for inverted cone */ |
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if (r1 == 0.) { /* check for illegal radii */ |
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if (r2 == 0.) |
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return(MG_EILL); |
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inv = r2 < 0.; |
| 166 |
} else if (r2 != 0. && inv ^ r2 < 0.) |
| 167 |
return(MG_EILL); |
| 168 |
if (inv) { |
| 169 |
r1 = -r1; |
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r2 = -r2; |
| 171 |
} |
| 172 |
if ((mat = material()) == NULL) /* get material */ |
| 173 |
return(MG_EBADMAT); |
| 174 |
/* spit the sucker out */ |
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printf("\n%s %s %sc%d\n", mat, inv ? "cup" : "cone", |
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object(), ++ncones); |
| 177 |
printf("0\n0\n8\n"); |
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putv(p1); |
| 179 |
putv(p2); |
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printf("%18.12g %18.12g\n", r1, r2); |
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return(MG_OK); |
| 182 |
} |
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|
| 184 |
|
| 185 |
int |
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r_cyl(ac, av) /* put out a cylinder */ |
| 187 |
int ac; |
| 188 |
char **av; |
| 189 |
{ |
| 190 |
static int ncyls; |
| 191 |
char *mat; |
| 192 |
double rad; |
| 193 |
C_VERTEX *cv1, *cv2; |
| 194 |
FVECT p1, p2; |
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int inv; |
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/* check argument count and type */ |
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if (ac != 4) |
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return(MG_EARGC); |
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if (!isflt(av[2])) |
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return(MG_ETYPE); |
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/* get the endpoint vertices */ |
| 202 |
if ((cv1 = c_getvert(av[1])) == NULL || |
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(cv2 = c_getvert(av[3])) == NULL) |
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return(MG_EUNDEF); |
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xf_xfmpoint(p1, cv1->p); /* transform endpoints */ |
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xf_xfmpoint(p2, cv2->p); |
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rad = xf_scale(atof(av[2])); /* scale radius */ |
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if ((inv = rad < 0.)) /* check for inverted cylinder */ |
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rad = -rad; |
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if ((mat = material()) == NULL) /* get material */ |
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return(MG_EBADMAT); |
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/* spit out the primitive */ |
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printf("\n%s %s %scy%d\n", mat, inv ? "tube" : "cylinder", |
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object(), ++ncyls); |
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printf("0\n0\n7\n"); |
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putv(p1); |
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putv(p2); |
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printf("%18.12g\n", rad); |
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return(MG_OK); |
| 220 |
} |
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|
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|
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int |
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r_sph(ac, av) /* put out a sphere */ |
| 225 |
int ac; |
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char **av; |
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{ |
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static int nsphs; |
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char *mat; |
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double rad; |
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C_VERTEX *cv; |
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FVECT cent; |
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int inv; |
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/* check argument count and type */ |
| 235 |
if (ac != 3) |
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return(MG_EARGC); |
| 237 |
if (!isflt(av[2])) |
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return(MG_ETYPE); |
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if ((cv = c_getvert(av[1])) == NULL) /* get center vertex */ |
| 240 |
return(MG_EUNDEF); |
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xf_xfmpoint(cent, cv->p); /* transform center */ |
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rad = xf_scale(atof(av[2])); /* scale radius */ |
| 243 |
if ((inv = rad < 0.)) /* check for inversion */ |
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rad = -rad; |
| 245 |
if ((mat = material()) == NULL) /* get material */ |
| 246 |
return(MG_EBADMAT); |
| 247 |
/* spit out primitive */ |
| 248 |
printf("\n%s %s %ss%d\n", mat, inv ? "bubble" : "sphere", |
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object(), ++nsphs); |
| 250 |
printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
| 251 |
cent[0], cent[1], cent[2], rad); |
| 252 |
return(MG_OK); |
| 253 |
} |
| 254 |
|
| 255 |
|
| 256 |
int |
| 257 |
r_ring(ac, av) /* put out a ring */ |
| 258 |
int ac; |
| 259 |
char **av; |
| 260 |
{ |
| 261 |
static int nrings; |
| 262 |
char *mat; |
| 263 |
double r1, r2; |
| 264 |
C_VERTEX *cv; |
| 265 |
FVECT cent, norm; |
| 266 |
/* check argument count and type */ |
| 267 |
if (ac != 4) |
| 268 |
return(MG_EARGC); |
| 269 |
if (!isflt(av[2]) || !isflt(av[3])) |
| 270 |
return(MG_ETYPE); |
| 271 |
if ((cv = c_getvert(av[1])) == NULL) /* get center vertex */ |
| 272 |
return(MG_EUNDEF); |
| 273 |
if (is0vect(cv->n)) /* make sure we have normal */ |
| 274 |
return(MG_EILL); |
| 275 |
xf_xfmpoint(cent, cv->p); /* transform center */ |
| 276 |
xf_rotvect(norm, cv->n); /* rotate normal */ |
| 277 |
r1 = xf_scale(atof(av[2])); /* scale radii */ |
| 278 |
r2 = xf_scale(atof(av[3])); |
| 279 |
if (r1 < 0. | r2 <= r1) |
| 280 |
return(MG_EILL); |
| 281 |
if ((mat = material()) == NULL) /* get material */ |
| 282 |
return(MG_EBADMAT); |
| 283 |
/* spit out primitive */ |
| 284 |
printf("\n%s ring %sr%d\n", mat, object(), ++nrings); |
| 285 |
printf("0\n0\n8\n"); |
| 286 |
putv(cent); |
| 287 |
putv(norm); |
| 288 |
printf("%18.12g %18.12g\n", r1, r2); |
| 289 |
return(MG_OK); |
| 290 |
} |
| 291 |
|
| 292 |
|
| 293 |
int |
| 294 |
r_face(ac, av) /* convert a face */ |
| 295 |
int ac; |
| 296 |
char **av; |
| 297 |
{ |
| 298 |
static int nfaces; |
| 299 |
char *mat; |
| 300 |
register int i; |
| 301 |
register C_VERTEX *cv; |
| 302 |
FVECT v; |
| 303 |
int rv; |
| 304 |
/* check argument count and type */ |
| 305 |
if (ac < 4) |
| 306 |
return(MG_EARGC); |
| 307 |
if ((mat = material()) == NULL) /* get material */ |
| 308 |
return(MG_EBADMAT); |
| 309 |
if (ac <= 5) { /* check for smoothing */ |
| 310 |
C_VERTEX *cva[5]; |
| 311 |
for (i = 1; i < ac; i++) { |
| 312 |
if ((cva[i-1] = c_getvert(av[i])) == NULL) |
| 313 |
return(MG_EUNDEF); |
| 314 |
if (is0vect(cva[i-1]->n)) |
| 315 |
break; |
| 316 |
} |
| 317 |
if (i == ac) { |
| 318 |
i = flat_tri(cva[0]->p, cva[1]->p, cva[2]->p, |
| 319 |
cva[0]->n, cva[1]->n, cva[2]->n); |
| 320 |
if (i < 0) |
| 321 |
return(MG_OK); /* degenerate (error?) */ |
| 322 |
} |
| 323 |
if (!i) { /* smoothed triangles */ |
| 324 |
do_tri(mat, cva[0], cva[1], cva[2]); |
| 325 |
if (ac == 5) |
| 326 |
do_tri(mat, cva[2], cva[3], cva[0]); |
| 327 |
return(MG_OK); |
| 328 |
} |
| 329 |
} |
| 330 |
/* spit out unsmoothed primitive */ |
| 331 |
printf("\n%s polygon %sf%d\n", mat, object(), ++nfaces); |
| 332 |
printf("0\n0\n%d\n", 3*(ac-1)); |
| 333 |
for (i = 1; i < ac; i++) { /* get, transform, print each vertex */ |
| 334 |
if ((cv = c_getvert(av[invert ? ac-i : i])) == NULL) |
| 335 |
return(MG_EUNDEF); |
| 336 |
xf_xfmpoint(v, cv->p); |
| 337 |
putv(v); |
| 338 |
} |
| 339 |
return(MG_OK); |
| 340 |
} |
| 341 |
|
| 342 |
|
| 343 |
int |
| 344 |
r_ies(ac, av) /* convert an IES luminaire file */ |
| 345 |
int ac; |
| 346 |
char **av; |
| 347 |
{ |
| 348 |
int xa0 = 2; |
| 349 |
char combuf[128]; |
| 350 |
char fname[48]; |
| 351 |
char *oname; |
| 352 |
register char *op; |
| 353 |
register int i; |
| 354 |
/* check argument count */ |
| 355 |
if (ac < 2) |
| 356 |
return(MG_EARGC); |
| 357 |
/* construct output file name */ |
| 358 |
if ((op = strrchr(av[1], '/')) != NULL) |
| 359 |
op++; |
| 360 |
else |
| 361 |
op = av[1]; |
| 362 |
(void)strcpy(fname, op); |
| 363 |
if ((op = strrchr(fname, '.')) == NULL) |
| 364 |
op = fname + strlen(fname); |
| 365 |
(void)strcpy(op, ".rad"); |
| 366 |
/* see if we need to run ies2rad */ |
| 367 |
if (access(fname, 0) == -1) { |
| 368 |
(void)strcpy(combuf, "ies2rad");/* build ies2rad command */ |
| 369 |
op = combuf + 7; /* get -m option (first) */ |
| 370 |
if (ac-xa0 >= 2 && !strcmp(av[xa0], "-m")) { |
| 371 |
if (!isflt(av[xa0+1])) |
| 372 |
return(MG_ETYPE); |
| 373 |
op = addarg(addarg(op, "-m"), av[xa0+1]); |
| 374 |
xa0 += 2; |
| 375 |
} |
| 376 |
*op++ = ' '; /* build IES filename */ |
| 377 |
i = 0; |
| 378 |
if (mg_file != NULL && |
| 379 |
(oname = strrchr(mg_file->fname,'/')) != NULL) { |
| 380 |
i = oname - mg_file->fname + 1; |
| 381 |
(void)strcpy(op, mg_file->fname); |
| 382 |
} |
| 383 |
(void)strcpy(op+i, av[1]); |
| 384 |
if (access(op, 0) == -1) /* check for file existence */ |
| 385 |
return(MG_ENOFILE); |
| 386 |
system(combuf); /* run ies2rad */ |
| 387 |
if (access(fname, 0) == -1) /* check success */ |
| 388 |
return(MG_EINCL); |
| 389 |
} |
| 390 |
printf("\n!xform"); /* put out xform command */ |
| 391 |
oname = object(); |
| 392 |
if (*oname) { |
| 393 |
printf(" -n "); |
| 394 |
for (op = oname; op[1]; op++) /* remove trailing separator */ |
| 395 |
putchar(*op); |
| 396 |
} |
| 397 |
for (i = xa0; i < ac; i++) |
| 398 |
printf(" %s", av[i]); |
| 399 |
if (ac > xa0 && xf_argc > 0) |
| 400 |
printf(" -i 1"); |
| 401 |
for (i = 0; i < xf_argc; i++) |
| 402 |
printf(" %s", xf_argv[i]); |
| 403 |
printf(" %s\n", fname); |
| 404 |
return(MG_OK); |
| 405 |
} |
| 406 |
|
| 407 |
|
| 408 |
do_tri(mat, cv1, cv2, cv3) /* put out smoothed triangle */ |
| 409 |
char *mat; |
| 410 |
C_VERTEX *cv1, *cv2, *cv3; |
| 411 |
{ |
| 412 |
static int ntris; |
| 413 |
BARYCCM bvecs; |
| 414 |
FLOAT bcoor[3][3]; |
| 415 |
C_VERTEX *cvt; |
| 416 |
FVECT v1, v2, v3; |
| 417 |
FVECT n1, n2, n3; |
| 418 |
register int i; |
| 419 |
|
| 420 |
if (invert) { /* swap vertex order if inverted */ |
| 421 |
cvt = cv1; |
| 422 |
cv1 = cv3; |
| 423 |
cv3 = cvt; |
| 424 |
} |
| 425 |
xf_xfmpoint(v1, cv1->p); |
| 426 |
xf_xfmpoint(v2, cv2->p); |
| 427 |
xf_xfmpoint(v3, cv3->p); |
| 428 |
/* compute barycentric coords. */ |
| 429 |
if (comp_baryc(&bvecs, v1, v2, v3) < 0) |
| 430 |
return; /* degenerate triangle! */ |
| 431 |
printf("\n%s texfunc T-nor\n", mat); /* put out texture */ |
| 432 |
printf("4 dx dy dz %s\n0\n", TCALNAME); |
| 433 |
xf_rotvect(n1, cv1->n); |
| 434 |
xf_rotvect(n2, cv2->n); |
| 435 |
xf_rotvect(n3, cv3->n); |
| 436 |
for (i = 0; i < 3; i++) { |
| 437 |
bcoor[i][0] = n1[i]; |
| 438 |
bcoor[i][1] = n2[i]; |
| 439 |
bcoor[i][2] = n3[i]; |
| 440 |
} |
| 441 |
put_baryc(&bvecs, bcoor, 3); |
| 442 |
/* put out triangle */ |
| 443 |
printf("\nT-nor polygon %st%d\n", object(), ++ntris); |
| 444 |
printf("0\n0\n9\n"); |
| 445 |
putv(v1); |
| 446 |
putv(v2); |
| 447 |
putv(v3); |
| 448 |
} |
| 449 |
|
| 450 |
|
| 451 |
char * |
| 452 |
material() /* get (and print) current material */ |
| 453 |
{ |
| 454 |
char *mname = "mat"; |
| 455 |
COLOR radrgb, c2; |
| 456 |
double d; |
| 457 |
register int i; |
| 458 |
|
| 459 |
if (c_cmname != NULL) |
| 460 |
mname = c_cmname; |
| 461 |
if (!c_cmaterial->clock) |
| 462 |
return(mname); /* already current */ |
| 463 |
/* else update output */ |
| 464 |
c_cmaterial->clock = 0; |
| 465 |
if (c_cmaterial->ed > .1) { /* emitter */ |
| 466 |
cvtcolor(radrgb, &c_cmaterial->ed_c, |
| 467 |
emult*c_cmaterial->ed/(PI*WHTEFFICACY)); |
| 468 |
if (glowdist < FHUGE) { /* do a glow */ |
| 469 |
fprintf(matfp, "\nvoid glow %s\n0\n0\n", mname); |
| 470 |
fprintf(matfp, "4 %f %f %f %f\n", colval(radrgb,RED), |
| 471 |
colval(radrgb,GRN), |
| 472 |
colval(radrgb,BLU), glowdist); |
| 473 |
} else { |
| 474 |
fprintf(matfp, "\nvoid light %s\n0\n0\n", mname); |
| 475 |
fprintf(matfp, "3 %f %f %f\n", colval(radrgb,RED), |
| 476 |
colval(radrgb,GRN), |
| 477 |
colval(radrgb,BLU)); |
| 478 |
} |
| 479 |
return(mname); |
| 480 |
} |
| 481 |
d = c_cmaterial->rd + c_cmaterial->td + |
| 482 |
c_cmaterial->rs + c_cmaterial->ts; |
| 483 |
if (d < 0. | d > 1.) |
| 484 |
return(NULL); |
| 485 |
/* check for glass/dielectric */ |
| 486 |
if (c_cmaterial->nr > 1.1 && |
| 487 |
c_cmaterial->ts > .25 && c_cmaterial->rs <= .125 && |
| 488 |
c_cmaterial->td <= .01 && c_cmaterial->rd <= .01 && |
| 489 |
c_cmaterial->rs_a <= .01 && c_cmaterial->ts_a <= .01) { |
| 490 |
cvtcolor(radrgb, &c_cmaterial->ts_c, |
| 491 |
c_cmaterial->ts + c_cmaterial->rs); |
| 492 |
if (c_cmaterial->sided) { /* dielectric */ |
| 493 |
colval(radrgb,RED) = pow(colval(radrgb,RED), |
| 494 |
1./C_1SIDEDTHICK); |
| 495 |
colval(radrgb,GRN) = pow(colval(radrgb,GRN), |
| 496 |
1./C_1SIDEDTHICK); |
| 497 |
colval(radrgb,BLU) = pow(colval(radrgb,BLU), |
| 498 |
1./C_1SIDEDTHICK); |
| 499 |
fprintf(matfp, "\nvoid dielectric %s\n0\n0\n", mname); |
| 500 |
fprintf(matfp, "5 %g %g %g %f 0\n", colval(radrgb,RED), |
| 501 |
colval(radrgb,GRN), colval(radrgb,BLU), |
| 502 |
c_cmaterial->nr); |
| 503 |
return(mname); |
| 504 |
} |
| 505 |
/* glass */ |
| 506 |
fprintf(matfp, "\nvoid glass %s\n0\n0\n", mname); |
| 507 |
fprintf(matfp, "4 %f %f %f %f\n", colval(radrgb,RED), |
| 508 |
colval(radrgb,GRN), colval(radrgb,BLU), |
| 509 |
c_cmaterial->nr); |
| 510 |
return(mname); |
| 511 |
} |
| 512 |
/* check for trans */ |
| 513 |
if (c_cmaterial->td > .01 || c_cmaterial->ts > .01) { |
| 514 |
double ts, a5, a6; |
| 515 |
|
| 516 |
if (c_cmaterial->sided) { |
| 517 |
ts = sqrt(c_cmaterial->ts); /* approximate */ |
| 518 |
a5 = .5; |
| 519 |
} else { |
| 520 |
ts = c_cmaterial->ts; |
| 521 |
a5 = 1.; |
| 522 |
} |
| 523 |
/* average colors */ |
| 524 |
d = c_cmaterial->rd + c_cmaterial->td + ts; |
| 525 |
cvtcolor(radrgb, &c_cmaterial->rd_c, c_cmaterial->rd/d); |
| 526 |
cvtcolor(c2, &c_cmaterial->td_c, c_cmaterial->td/d); |
| 527 |
addcolor(radrgb, c2); |
| 528 |
cvtcolor(c2, &c_cmaterial->ts_c, ts/d); |
| 529 |
addcolor(radrgb, c2); |
| 530 |
if (c_cmaterial->rs + ts > .0001) |
| 531 |
a5 = (c_cmaterial->rs*c_cmaterial->rs_a + |
| 532 |
ts*a5*c_cmaterial->ts_a) / |
| 533 |
(c_cmaterial->rs + ts); |
| 534 |
a6 = (c_cmaterial->td + ts) / |
| 535 |
(c_cmaterial->rd + c_cmaterial->td + ts); |
| 536 |
if (a6 < .999) |
| 537 |
d = c_cmaterial->rd/(1. - c_cmaterial->rs)/(1. - a6); |
| 538 |
else |
| 539 |
d = c_cmaterial->td + ts; |
| 540 |
scalecolor(radrgb, d); |
| 541 |
fprintf(matfp, "\nvoid trans %s\n0\n0\n", mname); |
| 542 |
fprintf(matfp, "7 %f %f %f\n", colval(radrgb,RED), |
| 543 |
colval(radrgb,GRN), colval(radrgb,BLU)); |
| 544 |
fprintf(matfp, "\t%f %f %f %f\n", c_cmaterial->rs, a5, a6, |
| 545 |
ts/(ts + c_cmaterial->td)); |
| 546 |
return(mname); |
| 547 |
} |
| 548 |
/* check for plastic */ |
| 549 |
if (c_cmaterial->rs < .1) { |
| 550 |
cvtcolor(radrgb, &c_cmaterial->rd_c, |
| 551 |
c_cmaterial->rd/(1.-c_cmaterial->rs)); |
| 552 |
fprintf(matfp, "\nvoid plastic %s\n0\n0\n", mname); |
| 553 |
fprintf(matfp, "5 %f %f %f %f %f\n", colval(radrgb,RED), |
| 554 |
colval(radrgb,GRN), colval(radrgb,BLU), |
| 555 |
c_cmaterial->rs, c_cmaterial->rs_a); |
| 556 |
return(mname); |
| 557 |
} |
| 558 |
/* else it's metal */ |
| 559 |
/* average colors */ |
| 560 |
cvtcolor(radrgb, &c_cmaterial->rd_c, c_cmaterial->rd); |
| 561 |
cvtcolor(c2, &c_cmaterial->rs_c, c_cmaterial->rs); |
| 562 |
addcolor(radrgb, c2); |
| 563 |
fprintf(matfp, "\nvoid metal %s\n0\n0\n", mname); |
| 564 |
fprintf(matfp, "5 %f %f %f %f %f\n", colval(radrgb,RED), |
| 565 |
colval(radrgb,GRN), colval(radrgb,BLU), |
| 566 |
c_cmaterial->rs/(c_cmaterial->rd + c_cmaterial->rs), |
| 567 |
c_cmaterial->rs_a); |
| 568 |
return(mname); |
| 569 |
} |
| 570 |
|
| 571 |
|
| 572 |
cvtcolor(radrgb, ciec, intensity) /* convert a CIE XYZ color to RGB */ |
| 573 |
COLOR radrgb; |
| 574 |
register C_COLOR *ciec; |
| 575 |
double intensity; |
| 576 |
{ |
| 577 |
static COLOR ciexyz; |
| 578 |
|
| 579 |
c_ccvt(ciec, C_CSXY); /* get xy representation */ |
| 580 |
ciexyz[1] = intensity; |
| 581 |
ciexyz[0] = ciec->cx/ciec->cy*ciexyz[1]; |
| 582 |
ciexyz[2] = ciexyz[1]*(1./ciec->cy - 1.) - ciexyz[0]; |
| 583 |
cie_rgb(radrgb, ciexyz); |
| 584 |
} |
| 585 |
|
| 586 |
|
| 587 |
char * |
| 588 |
object() /* return current object name */ |
| 589 |
{ |
| 590 |
static char objbuf[64]; |
| 591 |
register int i; |
| 592 |
register char *cp; |
| 593 |
int len; |
| 594 |
/* tracked by obj_handler */ |
| 595 |
i = obj_nnames - sizeof(objbuf)/16; |
| 596 |
if (i < 0) |
| 597 |
i = 0; |
| 598 |
for (cp = objbuf; i < obj_nnames && |
| 599 |
cp + (len=strlen(obj_name[i])) < objbuf+sizeof(objbuf)-1; |
| 600 |
i++, *cp++ = '.') { |
| 601 |
strcpy(cp, obj_name[i]); |
| 602 |
cp += len; |
| 603 |
} |
| 604 |
*cp = '\0'; |
| 605 |
return(objbuf); |
| 606 |
} |
| 607 |
|
| 608 |
|
| 609 |
char * |
| 610 |
addarg(op, arg) /* add argument and advance pointer */ |
| 611 |
register char *op, *arg; |
| 612 |
{ |
| 613 |
*op = ' '; |
| 614 |
while (*++op = *arg++) |
| 615 |
; |
| 616 |
return(op); |
| 617 |
} |
