10 |
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#include "copyright.h" |
11 |
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|
12 |
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#include "ray.h" |
13 |
< |
|
13 |
> |
#include "source.h" |
14 |
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#include "otypes.h" |
15 |
– |
|
15 |
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#include "otspecial.h" |
16 |
+ |
#include "random.h" |
17 |
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|
18 |
|
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
19 |
|
|
20 |
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unsigned long raynum = 0; /* next unique ray number */ |
21 |
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unsigned long nrays = 0; /* number of calls to localhit */ |
22 |
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|
23 |
< |
static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
23 |
> |
static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
24 |
|
OBJREC Lamb = { |
25 |
|
OVOID, MAT_PLASTIC, "Lambertian", |
26 |
< |
{0, 5, NULL, Lambfa}, NULL, |
26 |
> |
{NULL, Lambfa, 0, 5}, NULL |
27 |
|
}; /* a Lambertian surface */ |
28 |
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|
29 |
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OBJREC Aftplane; /* aft clipping plane object */ |
30 |
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|
31 |
– |
static int raymove(), checkhit(); |
32 |
– |
static void checkset(); |
33 |
– |
|
34 |
– |
#ifndef MAXLOOP |
35 |
– |
#define MAXLOOP 0 /* modifier loop detection */ |
36 |
– |
#endif |
37 |
– |
|
31 |
|
#define RAYHIT (-1) /* return value for intercepted ray */ |
32 |
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|
33 |
+ |
static int raymove(FVECT pos, OBJECT *cxs, int dirf, RAY *r, CUBE *cu); |
34 |
+ |
static int checkhit(RAY *r, CUBE *cu, OBJECT *cxs); |
35 |
+ |
static void checkset(OBJECT *os, OBJECT *cs); |
36 |
|
|
41 |
– |
int |
42 |
– |
rayorigin(r, ro, rt, rw) /* start new ray from old one */ |
43 |
– |
register RAY *r, *ro; |
44 |
– |
int rt; |
45 |
– |
double rw; |
46 |
– |
{ |
47 |
– |
double re; |
37 |
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|
38 |
+ |
extern int |
39 |
+ |
rayorigin( /* start new ray from old one */ |
40 |
+ |
RAY *r, |
41 |
+ |
int rt, |
42 |
+ |
const RAY *ro, |
43 |
+ |
const COLOR rc |
44 |
+ |
) |
45 |
+ |
{ |
46 |
+ |
double rw, re; |
47 |
+ |
/* assign coefficient/weight */ |
48 |
+ |
if (rc == NULL) { |
49 |
+ |
rw = 1.0; |
50 |
+ |
setcolor(r->rcoef, 1., 1., 1.); |
51 |
+ |
} else { |
52 |
+ |
rw = intens(rc); |
53 |
+ |
if (rc != r->rcoef) |
54 |
+ |
copycolor(r->rcoef, rc); |
55 |
+ |
} |
56 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
57 |
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r->rlvl = 0; |
58 |
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r->rweight = rw; |
65 |
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r->gecc = seccg; |
66 |
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r->slights = NULL; |
67 |
|
} else { /* spawned ray */ |
68 |
+ |
if (ro->rot >= FHUGE) { |
69 |
+ |
memset(r, 0, sizeof(RAY)); |
70 |
+ |
return(-1); /* illegal continuation */ |
71 |
+ |
} |
72 |
|
r->rlvl = ro->rlvl; |
73 |
|
if (rt & RAYREFL) { |
74 |
|
r->rlvl++; |
88 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
89 |
|
VCOPY(r->rorg, ro->rop); |
90 |
|
r->rweight = ro->rweight * rw; |
91 |
< |
/* estimate absorption */ |
91 |
> |
/* estimate extinction */ |
92 |
|
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
93 |
|
colval(ro->cext,RED) : colval(ro->cext,GRN); |
94 |
|
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
95 |
< |
if (re > 0.) |
96 |
< |
r->rweight *= exp(-re*ro->rot); |
95 |
> |
re *= ro->rot; |
96 |
> |
if (re > 0.1) { |
97 |
> |
if (re > 92.) { |
98 |
> |
r->rweight = 0.0; |
99 |
> |
} else { |
100 |
> |
r->rweight *= exp(-re); |
101 |
> |
} |
102 |
> |
} |
103 |
|
} |
104 |
|
rayclear(r); |
105 |
< |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
105 |
> |
if (r->rweight <= 0.0) /* check for expiration */ |
106 |
> |
return(-1); |
107 |
> |
if (r->crtype & SHADOW) /* shadow commitment */ |
108 |
> |
return(0); |
109 |
> |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
110 |
> |
if (minweight <= 0.0) |
111 |
> |
error(USER, "zero ray weight in Russian roulette"); |
112 |
> |
if (maxdepth < 0 && r->rlvl > -maxdepth) |
113 |
> |
return(-1); /* upper reflection limit */ |
114 |
> |
if (r->rweight >= minweight) |
115 |
> |
return(0); |
116 |
> |
if (frandom() > r->rweight/minweight) |
117 |
> |
return(-1); |
118 |
> |
rw = minweight/r->rweight; /* promote survivor */ |
119 |
> |
scalecolor(r->rcoef, rw); |
120 |
> |
r->rweight = minweight; |
121 |
> |
return(0); |
122 |
> |
} |
123 |
> |
return(r->rlvl <= abs(maxdepth) && r->rweight >= minweight ? 0 : -1); |
124 |
|
} |
125 |
|
|
126 |
|
|
127 |
< |
void |
128 |
< |
rayclear(r) /* clear a ray for (re)evaluation */ |
129 |
< |
register RAY *r; |
127 |
> |
extern void |
128 |
> |
rayclear( /* clear a ray for (re)evaluation */ |
129 |
> |
register RAY *r |
130 |
> |
) |
131 |
|
{ |
132 |
|
r->rno = raynum++; |
133 |
|
r->newcset = r->clipset; |
143 |
|
} |
144 |
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|
145 |
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|
146 |
< |
void |
147 |
< |
raytrace(r) /* trace a ray and compute its value */ |
148 |
< |
RAY *r; |
146 |
> |
extern void |
147 |
> |
raytrace( /* trace a ray and compute its value */ |
148 |
> |
RAY *r |
149 |
> |
) |
150 |
|
{ |
151 |
|
if (localhit(r, &thescene)) |
152 |
|
raycont(r); /* hit local surface, evaluate */ |
156 |
|
} else if (sourcehit(r)) |
157 |
|
rayshade(r, r->ro->omod); /* distant source */ |
158 |
|
|
122 |
– |
rayparticipate(r); /* for participating medium */ |
123 |
– |
|
159 |
|
if (trace != NULL) |
160 |
|
(*trace)(r); /* trace execution */ |
161 |
+ |
|
162 |
+ |
rayparticipate(r); /* for participating medium */ |
163 |
|
} |
164 |
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|
165 |
|
|
166 |
< |
void |
167 |
< |
raycont(r) /* check for clipped object and continue */ |
168 |
< |
register RAY *r; |
166 |
> |
extern void |
167 |
> |
raycont( /* check for clipped object and continue */ |
168 |
> |
register RAY *r |
169 |
> |
) |
170 |
|
{ |
171 |
|
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
172 |
|
!rayshade(r, r->ro->omod)) |
174 |
|
} |
175 |
|
|
176 |
|
|
177 |
< |
void |
178 |
< |
raytrans(r) /* transmit ray as is */ |
179 |
< |
register RAY *r; |
177 |
> |
extern void |
178 |
> |
raytrans( /* transmit ray as is */ |
179 |
> |
register RAY *r |
180 |
> |
) |
181 |
|
{ |
182 |
|
RAY tr; |
183 |
|
|
184 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
184 |
> |
if (rayorigin(&tr, TRANS, r, NULL) == 0) { |
185 |
|
VCOPY(tr.rdir, r->rdir); |
186 |
|
rayvalue(&tr); |
187 |
|
copycolor(r->rcol, tr.rcol); |
190 |
|
} |
191 |
|
|
192 |
|
|
193 |
< |
int |
194 |
< |
rayshade(r, mod) /* shade ray r with material mod */ |
195 |
< |
register RAY *r; |
196 |
< |
int mod; |
193 |
> |
extern int |
194 |
> |
rayshade( /* shade ray r with material mod */ |
195 |
> |
register RAY *r, |
196 |
> |
int mod |
197 |
> |
) |
198 |
|
{ |
159 |
– |
int gotmat; |
199 |
|
register OBJREC *m; |
200 |
< |
#if MAXLOOP |
162 |
< |
static int depth = 0; |
163 |
< |
/* check for infinite loop */ |
164 |
< |
if (depth++ >= MAXLOOP) |
165 |
< |
objerror(r->ro, USER, "possible modifier loop"); |
166 |
< |
#endif |
200 |
> |
|
201 |
|
r->rt = r->rot; /* set effective ray length */ |
202 |
< |
for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
202 |
> |
for ( ; mod != OVOID; mod = m->omod) { |
203 |
|
m = objptr(mod); |
204 |
|
/****** unnecessary test since modifier() is always called |
205 |
|
if (!ismodifier(m->otype)) { |
209 |
|
******/ |
210 |
|
/* hack for irradiance calculation */ |
211 |
|
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
212 |
+ |
m->otype != MAT_CLIP && |
213 |
|
(ofun[m->otype].flags & (T_M|T_X))) { |
214 |
|
if (irr_ignore(m->otype)) { |
180 |
– |
#if MAXLOOP |
181 |
– |
depth--; |
182 |
– |
#endif |
215 |
|
raytrans(r); |
216 |
|
return(1); |
217 |
|
} |
218 |
|
if (!islight(m->otype)) |
219 |
|
m = &Lamb; |
220 |
|
} |
221 |
< |
/* materials call raytexture */ |
222 |
< |
gotmat = (*ofun[m->otype].funp)(m, r); |
221 |
> |
if ((*ofun[m->otype].funp)(m, r)) |
222 |
> |
return(1); /* materials call raytexture() */ |
223 |
|
} |
224 |
< |
#if MAXLOOP |
193 |
< |
depth--; |
194 |
< |
#endif |
195 |
< |
return(gotmat); |
224 |
> |
return(0); /* no material! */ |
225 |
|
} |
226 |
|
|
227 |
|
|
228 |
< |
void |
229 |
< |
rayparticipate(r) /* compute ray medium participation */ |
230 |
< |
register RAY *r; |
228 |
> |
extern void |
229 |
> |
rayparticipate( /* compute ray medium participation */ |
230 |
> |
register RAY *r |
231 |
> |
) |
232 |
|
{ |
233 |
|
COLOR ce, ca; |
234 |
|
double re, ge, be; |
243 |
|
ge *= 1. - colval(r->albedo,GRN); |
244 |
|
be *= 1. - colval(r->albedo,BLU); |
245 |
|
} |
246 |
< |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
247 |
< |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
248 |
< |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
249 |
< |
multcolor(r->rcol, ce); /* path absorption */ |
246 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
247 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
248 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
249 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
250 |
|
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
251 |
|
return; /* no scattering */ |
252 |
|
setcolor(ca, |
258 |
|
} |
259 |
|
|
260 |
|
|
261 |
< |
void |
262 |
< |
raytexture(r, mod) /* get material modifiers */ |
263 |
< |
RAY *r; |
264 |
< |
OBJECT mod; |
261 |
> |
extern void |
262 |
> |
raytexture( /* get material modifiers */ |
263 |
> |
RAY *r, |
264 |
> |
OBJECT mod |
265 |
> |
) |
266 |
|
{ |
267 |
|
register OBJREC *m; |
237 |
– |
#if MAXLOOP |
238 |
– |
static int depth = 0; |
239 |
– |
/* check for infinite loop */ |
240 |
– |
if (depth++ >= MAXLOOP) |
241 |
– |
objerror(r->ro, USER, "modifier loop"); |
242 |
– |
#endif |
268 |
|
/* execute textures and patterns */ |
269 |
|
for ( ; mod != OVOID; mod = m->omod) { |
270 |
|
m = objptr(mod); |
280 |
|
objerror(r->ro, USER, errmsg); |
281 |
|
} |
282 |
|
} |
258 |
– |
#if MAXLOOP |
259 |
– |
depth--; /* end here */ |
260 |
– |
#endif |
283 |
|
} |
284 |
|
|
285 |
|
|
286 |
< |
int |
287 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
288 |
< |
register RAY *r; |
289 |
< |
OBJECT fore, back; |
290 |
< |
double coef; |
286 |
> |
extern int |
287 |
> |
raymixture( /* mix modifiers */ |
288 |
> |
register RAY *r, |
289 |
> |
OBJECT fore, |
290 |
> |
OBJECT back, |
291 |
> |
double coef |
292 |
> |
) |
293 |
|
{ |
294 |
|
RAY fr, br; |
295 |
|
int foremat, backmat; |
302 |
|
/* compute foreground and background */ |
303 |
|
foremat = backmat = 0; |
304 |
|
/* foreground */ |
305 |
< |
copystruct(&fr, r); |
306 |
< |
if (coef > FTINY) |
305 |
> |
fr = *r; |
306 |
> |
if (coef > FTINY) { |
307 |
> |
scalecolor(fr.rcoef, coef); |
308 |
|
foremat = rayshade(&fr, fore); |
309 |
+ |
} |
310 |
|
/* background */ |
311 |
< |
copystruct(&br, r); |
312 |
< |
if (coef < 1.0-FTINY) |
311 |
> |
br = *r; |
312 |
> |
if (coef < 1.0-FTINY) { |
313 |
> |
scalecolor(br.rcoef, 1.0-coef); |
314 |
|
backmat = rayshade(&br, back); |
315 |
+ |
} |
316 |
|
/* check for transparency */ |
317 |
< |
if (backmat ^ foremat) |
317 |
> |
if (backmat ^ foremat) { |
318 |
|
if (backmat && coef > FTINY) |
319 |
|
raytrans(&fr); |
320 |
|
else if (foremat && coef < 1.0-FTINY) |
321 |
|
raytrans(&br); |
322 |
+ |
} |
323 |
|
/* mix perturbations */ |
324 |
|
for (i = 0; i < 3; i++) |
325 |
|
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
341 |
|
} |
342 |
|
|
343 |
|
|
344 |
< |
double |
345 |
< |
raydist(r, flags) /* compute (cumulative) ray distance */ |
346 |
< |
register RAY *r; |
347 |
< |
register int flags; |
344 |
> |
extern double |
345 |
> |
raydist( /* compute (cumulative) ray distance */ |
346 |
> |
register const RAY *r, |
347 |
> |
register int flags |
348 |
> |
) |
349 |
|
{ |
350 |
|
double sum = 0.0; |
351 |
|
|
357 |
|
} |
358 |
|
|
359 |
|
|
360 |
< |
double |
361 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
362 |
< |
FVECT norm; |
363 |
< |
register RAY *r; |
360 |
> |
extern void |
361 |
> |
raycontrib( /* compute (cumulative) ray contribution */ |
362 |
> |
double rc[3], |
363 |
> |
const RAY *r, |
364 |
> |
int flags |
365 |
> |
) |
366 |
|
{ |
367 |
+ |
double eext[3]; |
368 |
+ |
int i; |
369 |
+ |
|
370 |
+ |
eext[0] = eext[1] = eext[2] = 0.; |
371 |
+ |
rc[0] = rc[1] = rc[2] = 1.; |
372 |
+ |
|
373 |
+ |
while (r != NULL && r->crtype&flags) { |
374 |
+ |
for (i = 3; i--; ) { |
375 |
+ |
rc[i] *= colval(r->rcoef,i); |
376 |
+ |
eext[i] += r->rot * colval(r->cext,i); |
377 |
+ |
} |
378 |
+ |
r = r->parent; |
379 |
+ |
} |
380 |
+ |
for (i = 3; i--; ) |
381 |
+ |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
382 |
+ |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
383 |
+ |
} |
384 |
+ |
|
385 |
+ |
|
386 |
+ |
extern double |
387 |
+ |
raynormal( /* compute perturbed normal for ray */ |
388 |
+ |
FVECT norm, |
389 |
+ |
register RAY *r |
390 |
+ |
) |
391 |
+ |
{ |
392 |
|
double newdot; |
393 |
|
register int i; |
394 |
|
|
419 |
|
} |
420 |
|
|
421 |
|
|
422 |
< |
void |
423 |
< |
newrayxf(r) /* get new tranformation matrix for ray */ |
424 |
< |
RAY *r; |
422 |
> |
extern void |
423 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
424 |
> |
RAY *r |
425 |
> |
) |
426 |
|
{ |
427 |
|
static struct xfn { |
428 |
|
struct xfn *next; |
429 |
|
FULLXF xf; |
430 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
431 |
|
register struct xfn *xp; |
432 |
< |
register RAY *rp; |
432 |
> |
register const RAY *rp; |
433 |
|
|
434 |
|
/* |
435 |
|
* Search for transform in circular list that |
457 |
|
} |
458 |
|
|
459 |
|
|
460 |
< |
void |
461 |
< |
flipsurface(r) /* reverse surface orientation */ |
462 |
< |
register RAY *r; |
460 |
> |
extern void |
461 |
> |
flipsurface( /* reverse surface orientation */ |
462 |
> |
register RAY *r |
463 |
> |
) |
464 |
|
{ |
465 |
|
r->rod = -r->rod; |
466 |
|
r->ron[0] = -r->ron[0]; |
472 |
|
} |
473 |
|
|
474 |
|
|
475 |
< |
void |
476 |
< |
rayhit(oset, r) /* standard ray hit test */ |
477 |
< |
OBJECT *oset; |
478 |
< |
RAY *r; |
475 |
> |
extern void |
476 |
> |
rayhit( /* standard ray hit test */ |
477 |
> |
OBJECT *oset, |
478 |
> |
RAY *r |
479 |
> |
) |
480 |
|
{ |
481 |
|
OBJREC *o; |
482 |
|
int i; |
489 |
|
} |
490 |
|
|
491 |
|
|
492 |
< |
int |
493 |
< |
localhit(r, scene) /* check for hit in the octree */ |
494 |
< |
register RAY *r; |
495 |
< |
register CUBE *scene; |
492 |
> |
extern int |
493 |
> |
localhit( /* check for hit in the octree */ |
494 |
> |
register RAY *r, |
495 |
> |
register CUBE *scene |
496 |
> |
) |
497 |
|
{ |
498 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
499 |
|
FVECT curpos; /* current cube position */ |
548 |
|
} |
549 |
|
cxset[0] = 0; |
550 |
|
raymove(curpos, cxset, sflags, r, scene); |
551 |
< |
return(r->ro != NULL & r->ro != &Aftplane); |
551 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
552 |
|
} |
553 |
|
|
554 |
|
|
555 |
|
static int |
556 |
< |
raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
557 |
< |
FVECT pos; /* current position, modified herein */ |
558 |
< |
OBJECT *cxs; /* checked objects, modified by checkhit */ |
559 |
< |
int dirf; /* direction indicators to speed tests */ |
560 |
< |
register RAY *r; |
561 |
< |
register CUBE *cu; |
556 |
> |
raymove( /* check for hit as we move */ |
557 |
> |
FVECT pos, /* current position, modified herein */ |
558 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
559 |
> |
int dirf, /* direction indicators to speed tests */ |
560 |
> |
register RAY *r, |
561 |
> |
register CUBE *cu |
562 |
> |
) |
563 |
|
{ |
564 |
|
int ax; |
565 |
|
double dt, t; |
640 |
|
|
641 |
|
|
642 |
|
static int |
643 |
< |
checkhit(r, cu, cxs) /* check for hit in full cube */ |
644 |
< |
register RAY *r; |
645 |
< |
CUBE *cu; |
646 |
< |
OBJECT *cxs; |
643 |
> |
checkhit( /* check for hit in full cube */ |
644 |
> |
register RAY *r, |
645 |
> |
CUBE *cu, |
646 |
> |
OBJECT *cxs |
647 |
> |
) |
648 |
|
{ |
649 |
|
OBJECT oset[MAXSET+1]; |
650 |
|
|
661 |
|
|
662 |
|
|
663 |
|
static void |
664 |
< |
checkset(os, cs) /* modify checked set and set to check */ |
665 |
< |
register OBJECT *os; /* os' = os - cs */ |
666 |
< |
register OBJECT *cs; /* cs' = cs + os */ |
664 |
> |
checkset( /* modify checked set and set to check */ |
665 |
> |
register OBJECT *os, /* os' = os - cs */ |
666 |
> |
register OBJECT *cs /* cs' = cs + os */ |
667 |
> |
) |
668 |
|
{ |
669 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
670 |
|
register int i, j; |