13 |
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#include "source.h" |
14 |
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#include "otypes.h" |
15 |
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#include "otspecial.h" |
16 |
+ |
#include "random.h" |
17 |
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|
18 |
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
19 |
|
|
20 |
< |
unsigned long raynum = 0; /* next unique ray number */ |
21 |
< |
unsigned long nrays = 0; /* number of calls to localhit */ |
20 |
> |
RNUMBER raynum = 0; /* next unique ray number */ |
21 |
> |
RNUMBER nrays = 0; /* number of calls to localhit */ |
22 |
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|
23 |
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static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
24 |
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OBJREC Lamb = { |
25 |
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OVOID, MAT_PLASTIC, "Lambertian", |
26 |
< |
{0, 5, NULL, Lambfa}, NULL, |
26 |
> |
{NULL, Lambfa, 0, 5}, NULL |
27 |
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}; /* a Lambertian surface */ |
28 |
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|
29 |
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OBJREC Aftplane; /* aft clipping plane object */ |
37 |
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|
38 |
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extern int |
39 |
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rayorigin( /* start new ray from old one */ |
40 |
< |
register RAY *r, |
40 |
< |
register RAY *ro, |
40 |
> |
RAY *r, |
41 |
|
int rt, |
42 |
< |
double rw |
42 |
> |
const RAY *ro, |
43 |
> |
const COLOR rc |
44 |
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) |
45 |
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{ |
46 |
< |
double re; |
47 |
< |
|
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 |
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if ((r->parent = ro) == NULL) { /* primary ray */ |
57 |
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r->rlvl = 0; |
58 |
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r->rweight = rw; |
59 |
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r->crtype = r->rtype = rt; |
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r->rsrc = -1; |
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r->clipset = NULL; |
62 |
+ |
r->revf = raytrace; |
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copycolor(r->cext, cextinction); |
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copycolor(r->albedo, salbedo); |
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r->gecc = seccg; |
66 |
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r->slights = NULL; |
57 |
– |
} else if (ro->rot >= FHUGE) { /* illegal continuation */ |
58 |
– |
memset(r, 0, sizeof(RAY)); |
59 |
– |
return(-1); |
67 |
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} else { /* spawned ray */ |
68 |
+ |
if (ro->rot >= FHUGE) { |
69 |
+ |
memset(r, 0, sizeof(RAY)); |
70 |
+ |
return(-1); /* illegal continuation */ |
71 |
+ |
} |
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r->rlvl = ro->rlvl; |
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if (rt & RAYREFL) { |
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r->rlvl++; |
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r->clipset = ro->newcset; |
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r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
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} |
83 |
+ |
r->revf = ro->revf; |
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copycolor(r->cext, ro->cext); |
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copycolor(r->albedo, ro->albedo); |
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r->gecc = ro->gecc; |
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r->crtype = ro->crtype | (r->rtype = rt); |
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VCOPY(r->rorg, ro->rop); |
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r->rweight = ro->rweight * rw; |
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< |
/* estimate absorption */ |
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> |
/* estimate extinction */ |
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re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
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colval(ro->cext,RED) : colval(ro->cext,GRN); |
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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); |
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> |
} |
102 |
> |
} |
103 |
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} |
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rayclear(r); |
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< |
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->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1); |
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} |
125 |
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|
126 |
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|
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extern void |
128 |
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rayclear( /* clear a ray for (re)evaluation */ |
129 |
< |
register RAY *r |
129 |
> |
RAY *r |
130 |
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) |
131 |
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{ |
132 |
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r->rno = raynum++; |
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|
145 |
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|
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extern void |
147 |
< |
rayvalue( /* trace a ray and compute its value */ |
147 |
> |
raytrace( /* trace a ray and compute its value */ |
148 |
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RAY *r |
149 |
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) |
150 |
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{ |
156 |
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} else if (sourcehit(r)) |
157 |
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rayshade(r, r->ro->omod); /* distant source */ |
158 |
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|
123 |
– |
rayparticipate(r); /* for participating medium */ |
124 |
– |
|
159 |
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if (trace != NULL) |
160 |
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(*trace)(r); /* trace execution */ |
161 |
+ |
|
162 |
+ |
rayparticipate(r); /* for participating medium */ |
163 |
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} |
164 |
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|
165 |
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|
166 |
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extern void |
167 |
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raycont( /* check for clipped object and continue */ |
168 |
< |
register RAY *r |
168 |
> |
RAY *r |
169 |
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) |
170 |
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{ |
171 |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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|
177 |
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extern void |
178 |
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raytrans( /* transmit ray as is */ |
179 |
< |
register RAY *r |
179 |
> |
RAY *r |
180 |
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) |
181 |
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{ |
182 |
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RAY tr; |
183 |
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|
184 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
184 |
> |
if (rayorigin(&tr, TRANS, r, NULL) == 0) { |
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VCOPY(tr.rdir, r->rdir); |
186 |
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rayvalue(&tr); |
187 |
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copycolor(r->rcol, tr.rcol); |
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|
193 |
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extern int |
194 |
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rayshade( /* shade ray r with material mod */ |
195 |
< |
register RAY *r, |
195 |
> |
RAY *r, |
196 |
|
int mod |
197 |
|
) |
198 |
|
{ |
199 |
< |
register OBJREC *m; |
199 |
> |
OBJREC *m; |
200 |
|
|
201 |
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r->rt = r->rot; /* set effective ray length */ |
202 |
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for ( ; mod != OVOID; mod = m->omod) { |
227 |
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|
228 |
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extern void |
229 |
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rayparticipate( /* compute ray medium participation */ |
230 |
< |
register RAY *r |
230 |
> |
RAY *r |
231 |
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) |
232 |
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{ |
233 |
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COLOR ce, ca; |
243 |
|
ge *= 1. - colval(r->albedo,GRN); |
244 |
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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 |
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if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
251 |
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return; /* no scattering */ |
252 |
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setcolor(ca, |
264 |
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OBJECT mod |
265 |
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) |
266 |
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{ |
267 |
< |
register OBJREC *m; |
267 |
> |
OBJREC *m; |
268 |
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/* execute textures and patterns */ |
269 |
|
for ( ; mod != OVOID; mod = m->omod) { |
270 |
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m = objptr(mod); |
285 |
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|
286 |
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extern int |
287 |
|
raymixture( /* mix modifiers */ |
288 |
< |
register RAY *r, |
288 |
> |
RAY *r, |
289 |
|
OBJECT fore, |
290 |
|
OBJECT back, |
291 |
|
double coef |
293 |
|
{ |
294 |
|
RAY fr, br; |
295 |
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int foremat, backmat; |
296 |
< |
register int i; |
296 |
> |
int i; |
297 |
|
/* bound coefficient */ |
298 |
|
if (coef > 1.0) |
299 |
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coef = 1.0; |
303 |
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foremat = backmat = 0; |
304 |
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/* foreground */ |
305 |
|
fr = *r; |
306 |
< |
if (coef > FTINY) |
306 |
> |
if (coef > FTINY) { |
307 |
> |
fr.rweight *= coef; |
308 |
> |
scalecolor(fr.rcoef, coef); |
309 |
|
foremat = rayshade(&fr, fore); |
310 |
+ |
} |
311 |
|
/* background */ |
312 |
|
br = *r; |
313 |
< |
if (coef < 1.0-FTINY) |
313 |
> |
if (coef < 1.0-FTINY) { |
314 |
> |
br.rweight *= 1.0-coef; |
315 |
> |
scalecolor(br.rcoef, 1.0-coef); |
316 |
|
backmat = rayshade(&br, back); |
317 |
+ |
} |
318 |
|
/* check for transparency */ |
319 |
|
if (backmat ^ foremat) { |
320 |
|
if (backmat && coef > FTINY) |
345 |
|
|
346 |
|
extern double |
347 |
|
raydist( /* compute (cumulative) ray distance */ |
348 |
< |
register RAY *r, |
349 |
< |
register int flags |
348 |
> |
const RAY *r, |
349 |
> |
int flags |
350 |
|
) |
351 |
|
{ |
352 |
|
double sum = 0.0; |
359 |
|
} |
360 |
|
|
361 |
|
|
362 |
+ |
extern void |
363 |
+ |
raycontrib( /* compute (cumulative) ray contribution */ |
364 |
+ |
RREAL rc[3], |
365 |
+ |
const RAY *r, |
366 |
+ |
int flags |
367 |
+ |
) |
368 |
+ |
{ |
369 |
+ |
double eext[3]; |
370 |
+ |
int i; |
371 |
+ |
|
372 |
+ |
eext[0] = eext[1] = eext[2] = 0.; |
373 |
+ |
rc[0] = rc[1] = rc[2] = 1.; |
374 |
+ |
|
375 |
+ |
while (r != NULL && r->crtype&flags) { |
376 |
+ |
for (i = 3; i--; ) { |
377 |
+ |
rc[i] *= colval(r->rcoef,i); |
378 |
+ |
eext[i] += r->rot * colval(r->cext,i); |
379 |
+ |
} |
380 |
+ |
r = r->parent; |
381 |
+ |
} |
382 |
+ |
for (i = 3; i--; ) |
383 |
+ |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
384 |
+ |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
385 |
+ |
} |
386 |
+ |
|
387 |
+ |
|
388 |
|
extern double |
389 |
|
raynormal( /* compute perturbed normal for ray */ |
390 |
|
FVECT norm, |
391 |
< |
register RAY *r |
391 |
> |
RAY *r |
392 |
|
) |
393 |
|
{ |
394 |
|
double newdot; |
395 |
< |
register int i; |
395 |
> |
int i; |
396 |
|
|
397 |
|
/* The perturbation is added to the surface normal to obtain |
398 |
|
* the new normal. If the new normal would affect the surface |
430 |
|
struct xfn *next; |
431 |
|
FULLXF xf; |
432 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
433 |
< |
register struct xfn *xp; |
434 |
< |
register RAY *rp; |
433 |
> |
struct xfn *xp; |
434 |
> |
const RAY *rp; |
435 |
|
|
436 |
|
/* |
437 |
|
* Search for transform in circular list that |
442 |
|
if (rp->rox == &xp->xf) { /* xp in use */ |
443 |
|
xp = xp->next; /* move to next */ |
444 |
|
if (xp == xflast) { /* need new one */ |
445 |
< |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
445 |
> |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
446 |
|
if (xp == NULL) |
447 |
|
error(SYSTEM, |
448 |
|
"out of memory in newrayxf"); |
461 |
|
|
462 |
|
extern void |
463 |
|
flipsurface( /* reverse surface orientation */ |
464 |
< |
register RAY *r |
464 |
> |
RAY *r |
465 |
|
) |
466 |
|
{ |
467 |
|
r->rod = -r->rod; |
493 |
|
|
494 |
|
extern int |
495 |
|
localhit( /* check for hit in the octree */ |
496 |
< |
register RAY *r, |
497 |
< |
register CUBE *scene |
496 |
> |
RAY *r, |
497 |
> |
CUBE *scene |
498 |
|
) |
499 |
|
{ |
500 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
501 |
|
FVECT curpos; /* current cube position */ |
502 |
|
int sflags; /* sign flags */ |
503 |
|
double t, dt; |
504 |
< |
register int i; |
504 |
> |
int i; |
505 |
|
|
506 |
|
nrays++; /* increment trace counter */ |
507 |
|
sflags = 0; |
512 |
|
else if (r->rdir[i] < -1e-7) |
513 |
|
sflags |= 0x10 << i; |
514 |
|
} |
515 |
< |
if (sflags == 0) |
516 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
515 |
> |
if (!sflags) { |
516 |
> |
error(WARNING, "zero ray direction in localhit"); |
517 |
> |
return(0); |
518 |
> |
} |
519 |
|
/* start off assuming nothing hit */ |
520 |
|
if (r->rmax > FTINY) { /* except aft plane if one */ |
521 |
|
r->ro = &Aftplane; |
522 |
|
r->rot = r->rmax; |
523 |
< |
for (i = 0; i < 3; i++) |
454 |
< |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
523 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
524 |
|
} |
525 |
|
/* find global cube entrance point */ |
526 |
|
t = 0.0; |
543 |
|
if (t >= r->rot) /* clipped already */ |
544 |
|
return(0); |
545 |
|
/* advance position */ |
546 |
< |
for (i = 0; i < 3; i++) |
478 |
< |
curpos[i] += r->rdir[i]*t; |
546 |
> |
VSUM(curpos, curpos, r->rdir, t); |
547 |
|
|
548 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
549 |
|
return(0); |
559 |
|
FVECT pos, /* current position, modified herein */ |
560 |
|
OBJECT *cxs, /* checked objects, modified by checkhit */ |
561 |
|
int dirf, /* direction indicators to speed tests */ |
562 |
< |
register RAY *r, |
563 |
< |
register CUBE *cu |
562 |
> |
RAY *r, |
563 |
> |
CUBE *cu |
564 |
|
) |
565 |
|
{ |
566 |
|
int ax; |
568 |
|
|
569 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
570 |
|
CUBE cukid; |
571 |
< |
register int br, sgn; |
571 |
> |
int br, sgn; |
572 |
|
|
573 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
574 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
634 |
|
ax = 2; |
635 |
|
} |
636 |
|
} |
637 |
< |
pos[0] += r->rdir[0]*t; |
570 |
< |
pos[1] += r->rdir[1]*t; |
571 |
< |
pos[2] += r->rdir[2]*t; |
637 |
> |
VSUM(pos, pos, r->rdir, t); |
638 |
|
return(ax); |
639 |
|
} |
640 |
|
|
641 |
|
|
642 |
|
static int |
643 |
|
checkhit( /* check for hit in full cube */ |
644 |
< |
register RAY *r, |
644 |
> |
RAY *r, |
645 |
|
CUBE *cu, |
646 |
|
OBJECT *cxs |
647 |
|
) |
662 |
|
|
663 |
|
static void |
664 |
|
checkset( /* modify checked set and set to check */ |
665 |
< |
register OBJECT *os, /* os' = os - cs */ |
666 |
< |
register OBJECT *cs /* cs' = cs + os */ |
665 |
> |
OBJECT *os, /* os' = os - cs */ |
666 |
> |
OBJECT *cs /* cs' = cs + os */ |
667 |
|
) |
668 |
|
{ |
669 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
670 |
< |
register int i, j; |
670 |
> |
int i, j; |
671 |
|
int k; |
672 |
|
/* copy os in place, cset <- cs */ |
673 |
|
cset[0] = 0; |