1 |
– |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* raytrace.c - routines for tracing and shading rays. |
6 |
|
* |
7 |
< |
* 8/7/85 |
7 |
> |
* External symbols declared in ray.h |
8 |
|
*/ |
9 |
|
|
10 |
< |
#include "ray.h" |
10 |
> |
#include "copyright.h" |
11 |
|
|
12 |
< |
#include "octree.h" |
13 |
< |
|
12 |
> |
#include "ray.h" |
13 |
> |
#include "source.h" |
14 |
|
#include "otypes.h" |
15 |
+ |
#include "otspecial.h" |
16 |
+ |
#include "random.h" |
17 |
+ |
#include "pmap.h" |
18 |
|
|
19 |
< |
extern CUBE thescene; /* our scene */ |
20 |
< |
extern int maxdepth; /* maximum recursion depth */ |
21 |
< |
extern double minweight; /* minimum ray weight */ |
19 |
> |
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
20 |
|
|
21 |
< |
long nrays = 0L; /* number of rays traced */ |
21 |
> |
RNUMBER raynum = 0; /* next unique ray number */ |
22 |
> |
RNUMBER nrays = 0; /* number of calls to localhit */ |
23 |
|
|
24 |
< |
#define MAXLOOP 32 /* modifier loop detection */ |
24 |
> |
static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
25 |
> |
OBJREC Lamb = { |
26 |
> |
OVOID, MAT_PLASTIC, "Lambertian", |
27 |
> |
{NULL, Lambfa, 0, 5}, NULL |
28 |
> |
}; /* a Lambertian surface */ |
29 |
|
|
30 |
+ |
OBJREC Aftplane; /* aft clipping plane object */ |
31 |
+ |
|
32 |
|
#define RAYHIT (-1) /* return value for intercepted ray */ |
33 |
|
|
34 |
+ |
static int raymove(FVECT pos, OBJECT *cxs, int dirf, RAY *r, CUBE *cu); |
35 |
+ |
static int checkhit(RAY *r, CUBE *cu, OBJECT *cxs); |
36 |
+ |
static void checkset(OBJECT *os, OBJECT *cs); |
37 |
|
|
38 |
< |
rayorigin(r, ro, rt, rw) /* start new ray from old one */ |
39 |
< |
register RAY *r, *ro; |
40 |
< |
int rt; |
41 |
< |
double rw; |
38 |
> |
|
39 |
> |
int |
40 |
> |
rayorigin( /* start new ray from old one */ |
41 |
> |
RAY *r, |
42 |
> |
int rt, |
43 |
> |
const RAY *ro, |
44 |
> |
const SCOLOR rc |
45 |
> |
) |
46 |
|
{ |
47 |
+ |
double rw, re; |
48 |
+ |
/* assign coefficient/weight */ |
49 |
+ |
if (rc == NULL) { |
50 |
+ |
rw = 1.0; |
51 |
+ |
setscolor(r->rcoef, 1., 1., 1.); |
52 |
+ |
} else { |
53 |
+ |
rw = sintens((COLORV *)rc); |
54 |
+ |
if (rw > 1.0) |
55 |
+ |
rw = 1.0; /* avoid calculation growth */ |
56 |
+ |
if (rc != r->rcoef) |
57 |
+ |
copyscolor(r->rcoef, rc); |
58 |
+ |
} |
59 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
60 |
|
r->rlvl = 0; |
61 |
|
r->rweight = rw; |
62 |
|
r->crtype = r->rtype = rt; |
63 |
|
r->rsrc = -1; |
64 |
+ |
#ifdef SSKIPOPT |
65 |
+ |
r->scorr = 1.f; |
66 |
+ |
#endif |
67 |
|
r->clipset = NULL; |
68 |
+ |
r->revf = raytrace; |
69 |
+ |
copycolor(r->cext, cextinction); |
70 |
+ |
copycolor(r->albedo, salbedo); |
71 |
+ |
r->gecc = seccg; |
72 |
+ |
r->slights = NULL; |
73 |
|
} else { /* spawned ray */ |
74 |
+ |
if (ro->rot >= FHUGE*.99) { |
75 |
+ |
memset(r, 0, sizeof(RAY)); |
76 |
+ |
return(-1); /* illegal continuation */ |
77 |
+ |
} |
78 |
|
r->rlvl = ro->rlvl; |
79 |
+ |
r->rsrc = ro->rsrc; |
80 |
+ |
#ifdef SSKIPOPT |
81 |
+ |
r->scorr = ro->scorr; |
82 |
+ |
#endif |
83 |
|
if (rt & RAYREFL) { |
84 |
|
r->rlvl++; |
85 |
< |
r->rsrc = -1; |
85 |
> |
if (r->rsrc >= 0) /* malfunctioning material? */ |
86 |
> |
r->rsrc = -1; |
87 |
|
r->clipset = ro->clipset; |
88 |
+ |
r->rmax = 0.0; |
89 |
|
} else { |
48 |
– |
r->rsrc = ro->rsrc; |
90 |
|
r->clipset = ro->newcset; |
91 |
+ |
r->rmax = (ro->rmax > FTINY)*(ro->rmax - ro->rot); |
92 |
|
} |
93 |
< |
r->rweight = ro->rweight * rw; |
93 |
> |
r->revf = ro->revf; |
94 |
> |
copycolor(r->cext, ro->cext); |
95 |
> |
copycolor(r->albedo, ro->albedo); |
96 |
> |
r->gecc = ro->gecc; |
97 |
> |
r->slights = ro->slights; |
98 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
99 |
|
VCOPY(r->rorg, ro->rop); |
100 |
+ |
r->rweight = ro->rweight * rw; |
101 |
+ |
/* estimate extinction */ |
102 |
+ |
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
103 |
+ |
colval(ro->cext,RED) : colval(ro->cext,GRN); |
104 |
+ |
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
105 |
+ |
re *= ro->rot; |
106 |
+ |
if (re > 0.1) { |
107 |
+ |
if (re > 92.) { |
108 |
+ |
r->rweight = 0.0; |
109 |
+ |
} else { |
110 |
+ |
r->rweight *= exp(-re); |
111 |
+ |
} |
112 |
+ |
} |
113 |
|
} |
114 |
< |
r->rno = nrays; |
114 |
> |
rayclear(r); |
115 |
> |
if (r->rweight <= 0.0) /* check for expiration */ |
116 |
> |
return(-1); |
117 |
> |
if (r->crtype & SHADOW) /* shadow commitment */ |
118 |
> |
return(0); |
119 |
> |
/* ambient in photon map? */ |
120 |
> |
if (ro != NULL && ro->crtype & AMBIENT) { |
121 |
> |
if (causticPhotonMapping) |
122 |
> |
return(-1); |
123 |
> |
if (photonMapping && rt != TRANS) |
124 |
> |
return(-1); |
125 |
> |
} |
126 |
> |
if ((maxdepth <= 0) & (rc != NULL)) { /* Russian roulette */ |
127 |
> |
if (minweight <= 0.0) |
128 |
> |
error(USER, "zero ray weight in Russian roulette"); |
129 |
> |
if ((maxdepth < 0) & (r->rlvl > -maxdepth)) |
130 |
> |
return(-1); /* upper reflection limit */ |
131 |
> |
if (r->rweight >= minweight) |
132 |
> |
return(0); |
133 |
> |
if (frandom() > r->rweight/minweight) |
134 |
> |
return(-1); |
135 |
> |
rw = minweight/r->rweight; /* promote survivor */ |
136 |
> |
scalescolor(r->rcoef, rw); |
137 |
> |
r->rweight = minweight; |
138 |
> |
return(0); |
139 |
> |
} |
140 |
> |
return((r->rweight >= minweight) & (r->rlvl <= abs(maxdepth)) ? 0 : -1); |
141 |
> |
} |
142 |
> |
|
143 |
> |
|
144 |
> |
void |
145 |
> |
rayclear( /* clear a ray for (re)evaluation */ |
146 |
> |
RAY *r |
147 |
> |
) |
148 |
> |
{ |
149 |
> |
r->rno = raynum++; |
150 |
|
r->newcset = r->clipset; |
151 |
+ |
r->hitf = rayhit; |
152 |
+ |
r->robj = OVOID; |
153 |
|
r->ro = NULL; |
154 |
< |
r->rot = FHUGE; |
155 |
< |
r->rofs = 1.0; setident4(r->rofx); |
156 |
< |
r->robs = 1.0; setident4(r->robx); |
154 |
> |
r->rox = NULL; |
155 |
> |
r->rxt = r->rmt = r->rot = FHUGE; |
156 |
> |
VCOPY(r->rop, r->rorg); |
157 |
> |
r->ron[0] = -r->rdir[0]; r->ron[1] = -r->rdir[1]; r->ron[2] = -r->rdir[2]; |
158 |
> |
r->rod = 1.0; |
159 |
|
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
160 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
161 |
< |
setcolor(r->rcol, 0.0, 0.0, 0.0); |
162 |
< |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
160 |
> |
r->rflips = 0; |
161 |
> |
r->uv[0] = r->uv[1] = 0.0; |
162 |
> |
setscolor(r->pcol, 1.0, 1.0, 1.0); |
163 |
> |
scolorblack(r->mcol); |
164 |
> |
scolorblack(r->rcol); |
165 |
|
} |
166 |
|
|
167 |
|
|
168 |
< |
rayvalue(r) /* compute a ray's value */ |
169 |
< |
register RAY *r; |
168 |
> |
void |
169 |
> |
raytrace( /* trace a ray and compute its value */ |
170 |
> |
RAY *r |
171 |
> |
) |
172 |
|
{ |
71 |
– |
extern int (*trace)(); |
72 |
– |
|
173 |
|
if (localhit(r, &thescene)) |
174 |
< |
if (r->clipset != NULL && inset(r->clipset, r->ro->omod)) |
175 |
< |
raytrans(r); /* object is clipped */ |
176 |
< |
else |
177 |
< |
rayshade(r, r->ro->omod); |
178 |
< |
else if (sourcehit(r)) |
179 |
< |
rayshade(r, r->ro->omod); |
174 |
> |
raycont(r); /* hit local surface, evaluate */ |
175 |
> |
else if (r->ro == &Aftplane) { |
176 |
> |
r->ro = NULL; /* hit aft clipping plane */ |
177 |
> |
r->rot = FHUGE; |
178 |
> |
} else if (sourcehit(r)) |
179 |
> |
rayshade(r, r->ro->omod); /* distant source */ |
180 |
|
|
181 |
|
if (trace != NULL) |
182 |
|
(*trace)(r); /* trace execution */ |
183 |
+ |
|
184 |
+ |
rayparticipate(r); /* for participating medium */ |
185 |
|
} |
186 |
|
|
187 |
|
|
188 |
< |
raytrans(r) /* transmit ray as is */ |
189 |
< |
RAY *r; |
188 |
> |
void |
189 |
> |
raycont( /* check for clipped object and continue */ |
190 |
> |
RAY *r |
191 |
> |
) |
192 |
|
{ |
193 |
+ |
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
194 |
+ |
!rayshade(r, r->ro->omod)) |
195 |
+ |
raytrans(r); |
196 |
+ |
} |
197 |
+ |
|
198 |
+ |
|
199 |
+ |
void |
200 |
+ |
raytrans( /* transmit ray as is */ |
201 |
+ |
RAY *r |
202 |
+ |
) |
203 |
+ |
{ |
204 |
|
RAY tr; |
205 |
|
|
206 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
207 |
< |
VCOPY(tr.rdir, r->rdir); |
208 |
< |
rayvalue(&tr); |
209 |
< |
copycolor(r->rcol, tr.rcol); |
206 |
> |
rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
207 |
> |
VCOPY(tr.rdir, r->rdir); |
208 |
> |
rayvalue(&tr); |
209 |
> |
copyscolor(r->mcol, tr.mcol); |
210 |
> |
copyscolor(r->rcol, tr.rcol); |
211 |
> |
r->rmt = r->rot + tr.rmt; |
212 |
> |
r->rxt = r->rot + tr.rxt; |
213 |
> |
} |
214 |
> |
|
215 |
> |
|
216 |
> |
int |
217 |
> |
raytirrad( /* irradiance hack */ |
218 |
> |
OBJREC *m, |
219 |
> |
RAY *r |
220 |
> |
) |
221 |
> |
{ |
222 |
> |
if (m->otype != MAT_CLIP && ismaterial(m->otype)) { |
223 |
> |
if (istransp(m->otype) || isBSDFproxy(m)) { |
224 |
> |
raytrans(r); |
225 |
> |
return(1); |
226 |
> |
} |
227 |
> |
if (!islight(m->otype)) { |
228 |
> |
setscolor(r->pcol, 1.0, 1.0, 1.0); |
229 |
> |
return((*ofun[Lamb.otype].funp)(&Lamb, r)); |
230 |
> |
} |
231 |
|
} |
232 |
+ |
return(0); /* not a qualifying surface */ |
233 |
|
} |
234 |
|
|
235 |
|
|
236 |
< |
rayshade(r, mod) /* shade ray r with material mod */ |
237 |
< |
register RAY *r; |
238 |
< |
int mod; |
236 |
> |
int |
237 |
> |
rayshade( /* shade ray r with material mod */ |
238 |
> |
RAY *r, |
239 |
> |
int mod |
240 |
> |
) |
241 |
|
{ |
242 |
< |
static int depth = 0; |
243 |
< |
register OBJREC *m; |
244 |
< |
/* check for infinite loop */ |
245 |
< |
if (depth++ >= MAXLOOP) |
107 |
< |
objerror(r->ro, USER, "material loop"); |
242 |
> |
int tst_irrad = do_irrad && !(r->crtype & ~(PRIMARY|TRANS)); |
243 |
> |
OBJREC *m; |
244 |
> |
|
245 |
> |
r->rxt = r->rot; /* preset effective ray length */ |
246 |
|
for ( ; mod != OVOID; mod = m->omod) { |
247 |
|
m = objptr(mod); |
248 |
+ |
/****** unnecessary test since modifier() is always called |
249 |
|
if (!ismodifier(m->otype)) { |
250 |
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
251 |
|
error(USER, errmsg); |
252 |
|
} |
253 |
< |
(*ofun[m->otype].funp)(m, r); /* execute function */ |
254 |
< |
m->lastrno = r->rno; |
255 |
< |
if (ismaterial(m->otype)) { /* materials call raytexture */ |
256 |
< |
depth--; |
257 |
< |
return; /* we're done */ |
258 |
< |
} |
253 |
> |
******/ |
254 |
> |
/* hack for irradiance calculation */ |
255 |
> |
if (tst_irrad && raytirrad(m, r)) |
256 |
> |
return(1); |
257 |
> |
|
258 |
> |
if ((*ofun[m->otype].funp)(m, r)) |
259 |
> |
return(1); /* materials call raytexture() */ |
260 |
|
} |
261 |
< |
objerror(r->ro, USER, "material not found"); |
261 |
> |
return(0); /* no material! */ |
262 |
|
} |
263 |
|
|
264 |
|
|
265 |
< |
raytexture(r, mod) /* get material modifiers */ |
266 |
< |
RAY *r; |
267 |
< |
int mod; |
265 |
> |
void |
266 |
> |
rayparticipate( /* compute ray medium participation */ |
267 |
> |
RAY *r |
268 |
> |
) |
269 |
|
{ |
270 |
< |
static int depth = 0; |
271 |
< |
register OBJREC *m; |
272 |
< |
/* check for infinite loop */ |
273 |
< |
if (depth++ >= MAXLOOP) |
274 |
< |
objerror(r->ro, USER, "modifier loop"); |
270 |
> |
SCOLOR ce, ca; |
271 |
> |
double re, ge, be; |
272 |
> |
|
273 |
> |
if (intens(r->cext) <= 1./FHUGE) |
274 |
> |
return; /* no medium */ |
275 |
> |
re = r->rot*colval(r->cext,RED); |
276 |
> |
ge = r->rot*colval(r->cext,GRN); |
277 |
> |
be = r->rot*colval(r->cext,BLU); |
278 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
279 |
> |
re *= 1. - colval(r->albedo,RED); |
280 |
> |
ge *= 1. - colval(r->albedo,GRN); |
281 |
> |
be *= 1. - colval(r->albedo,BLU); |
282 |
> |
} |
283 |
> |
setscolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
284 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
285 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
286 |
> |
smultscolor(r->rcol, ce); /* path extinction */ |
287 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
288 |
> |
return; /* no scattering */ |
289 |
> |
|
290 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
291 |
> |
if (!volumePhotonMapping) { |
292 |
> |
setscolor(ca, |
293 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
294 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
295 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
296 |
> |
saddscolor(r->rcol, ca); /* ambient in scattering */ |
297 |
> |
} |
298 |
> |
|
299 |
> |
srcscatter(r); /* source in scattering */ |
300 |
> |
} |
301 |
> |
|
302 |
> |
|
303 |
> |
void |
304 |
> |
raytexture( /* get material modifiers */ |
305 |
> |
RAY *r, |
306 |
> |
OBJECT mod |
307 |
> |
) |
308 |
> |
{ |
309 |
> |
OBJREC *m; |
310 |
|
/* execute textures and patterns */ |
311 |
|
for ( ; mod != OVOID; mod = m->omod) { |
312 |
|
m = objptr(mod); |
313 |
< |
if (!istexture(m->otype)) { |
313 |
> |
/****** unnecessary test since modifier() is always called |
314 |
> |
if (!ismodifier(m->otype)) { |
315 |
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
316 |
|
error(USER, errmsg); |
317 |
|
} |
318 |
< |
(*ofun[m->otype].funp)(m, r); |
319 |
< |
m->lastrno = r->rno; |
318 |
> |
******/ |
319 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
320 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
321 |
> |
m->oname); |
322 |
> |
objerror(r->ro, USER, errmsg); |
323 |
> |
} |
324 |
|
} |
144 |
– |
depth--; /* end here */ |
325 |
|
} |
326 |
|
|
327 |
|
|
328 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
329 |
< |
register RAY *r; |
330 |
< |
OBJECT fore, back; |
331 |
< |
double coef; |
328 |
> |
int |
329 |
> |
raymixture( /* mix modifiers */ |
330 |
> |
RAY *r, |
331 |
> |
OBJECT fore, |
332 |
> |
OBJECT back, |
333 |
> |
double coef |
334 |
> |
) |
335 |
|
{ |
336 |
< |
FVECT curpert, forepert, backpert; |
337 |
< |
COLOR curpcol, forepcol, backpcol; |
338 |
< |
register int i; |
339 |
< |
/* clip coefficient */ |
336 |
> |
RAY fr, br; |
337 |
> |
double mfore, mback; |
338 |
> |
int foremat, backmat; |
339 |
> |
int i; |
340 |
> |
/* bound coefficient */ |
341 |
|
if (coef > 1.0) |
342 |
|
coef = 1.0; |
343 |
|
else if (coef < 0.0) |
344 |
|
coef = 0.0; |
345 |
< |
/* save current mods */ |
346 |
< |
VCOPY(curpert, r->pert); |
347 |
< |
copycolor(curpcol, r->pcol); |
348 |
< |
/* compute new mods */ |
349 |
< |
/* foreground */ |
350 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
351 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
352 |
< |
if (fore != OVOID && coef > FTINY) |
353 |
< |
raytexture(r, fore); |
354 |
< |
VCOPY(forepert, r->pert); |
355 |
< |
copycolor(forepcol, r->pcol); |
356 |
< |
/* background */ |
357 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
358 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
359 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
360 |
< |
raytexture(r, back); |
361 |
< |
VCOPY(backpert, r->pert); |
362 |
< |
copycolor(backpcol, r->pcol); |
363 |
< |
/* sum perturbations */ |
345 |
> |
/* compute foreground and background */ |
346 |
> |
foremat = backmat = 0; |
347 |
> |
/* foreground */ |
348 |
> |
fr = *r; |
349 |
> |
if (coef > FTINY) { |
350 |
> |
fr.rweight *= coef; |
351 |
> |
scalescolor(fr.rcoef, coef); |
352 |
> |
foremat = rayshade(&fr, fore); |
353 |
> |
} |
354 |
> |
/* background */ |
355 |
> |
br = *r; |
356 |
> |
if (coef < 1.0-FTINY) { |
357 |
> |
br.rweight *= 1.0-coef; |
358 |
> |
scalescolor(br.rcoef, 1.0-coef); |
359 |
> |
backmat = rayshade(&br, back); |
360 |
> |
} |
361 |
> |
/* check for transparency */ |
362 |
> |
if (backmat ^ foremat) { |
363 |
> |
if (backmat && coef > FTINY) |
364 |
> |
raytrans(&fr); |
365 |
> |
else if (foremat && coef < 1.0-FTINY) |
366 |
> |
raytrans(&br); |
367 |
> |
} |
368 |
> |
/* mix perturbations */ |
369 |
|
for (i = 0; i < 3; i++) |
370 |
< |
r->pert[i] = curpert[i] + coef*forepert[i] + |
371 |
< |
(1.0-coef)*backpert[i]; |
372 |
< |
/* multiply colors */ |
373 |
< |
setcolor(r->pcol, coef*colval(forepcol,RED) + |
374 |
< |
(1.0-coef)*colval(backpcol,RED), |
375 |
< |
coef*colval(forepcol,GRN) + |
376 |
< |
(1.0-coef)*colval(backpcol,GRN), |
377 |
< |
coef*colval(forepcol,BLU) + |
378 |
< |
(1.0-coef)*colval(backpcol,BLU)); |
379 |
< |
multcolor(r->pcol, curpcol); |
370 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
371 |
> |
/* mix pattern colors */ |
372 |
> |
scalescolor(fr.pcol, coef); |
373 |
> |
scalescolor(br.pcol, 1.0-coef); |
374 |
> |
copyscolor(r->pcol, fr.pcol); |
375 |
> |
saddscolor(r->pcol, br.pcol); |
376 |
> |
/* return value tells if material */ |
377 |
> |
if (!foremat & !backmat) |
378 |
> |
return(0); |
379 |
> |
/* mix returned ray values */ |
380 |
> |
scalescolor(fr.rcol, coef); |
381 |
> |
scalescolor(br.rcol, 1.0-coef); |
382 |
> |
copyscolor(r->rcol, fr.rcol); |
383 |
> |
saddscolor(r->rcol, br.rcol); |
384 |
> |
scalescolor(fr.mcol, coef); |
385 |
> |
scalescolor(br.mcol, 1.0-coef); |
386 |
> |
copyscolor(r->mcol, fr.mcol); |
387 |
> |
saddscolor(r->mcol, br.mcol); |
388 |
> |
mfore = pbright(fr.mcol); mback = pbright(br.mcol); |
389 |
> |
r->rmt = mfore > mback ? fr.rmt : br.rmt; |
390 |
> |
r->rxt = pbright(fr.rcol)-mfore > pbright(br.rcol)-mback ? |
391 |
> |
fr.rxt : br.rxt; |
392 |
> |
return(1); |
393 |
|
} |
394 |
|
|
395 |
|
|
396 |
|
double |
397 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
398 |
< |
FVECT norm; |
399 |
< |
register RAY *r; |
397 |
> |
raydist( /* compute (cumulative) ray distance */ |
398 |
> |
const RAY *r, |
399 |
> |
int flags |
400 |
> |
) |
401 |
|
{ |
402 |
+ |
double sum = 0.0; |
403 |
+ |
|
404 |
+ |
while (r != NULL && r->crtype&flags) { |
405 |
+ |
sum += r->rot; |
406 |
+ |
r = r->parent; |
407 |
+ |
} |
408 |
+ |
return(sum); |
409 |
+ |
} |
410 |
+ |
|
411 |
+ |
|
412 |
+ |
void |
413 |
+ |
raycontrib( /* compute (cumulative) ray contribution */ |
414 |
+ |
SCOLOR rc, |
415 |
+ |
const RAY *r, |
416 |
+ |
int flags |
417 |
+ |
) |
418 |
+ |
{ |
419 |
+ |
static int warnedPM = 0; |
420 |
+ |
|
421 |
+ |
setscolor(rc, 1., 1., 1.); |
422 |
+ |
|
423 |
+ |
while (r != NULL && r->crtype&flags) { |
424 |
+ |
smultscolor(rc, r->rcoef); |
425 |
+ |
/* check for participating medium */ |
426 |
+ |
if (!warnedPM && (bright(r->cext) > FTINY) | |
427 |
+ |
(bright(r->albedo) > FTINY)) { |
428 |
+ |
error(WARNING, |
429 |
+ |
"ray contribution calculation does not support participating media"); |
430 |
+ |
warnedPM++; |
431 |
+ |
} |
432 |
+ |
r = r->parent; |
433 |
+ |
} |
434 |
+ |
} |
435 |
+ |
|
436 |
+ |
|
437 |
+ |
double |
438 |
+ |
raynormal( /* compute perturbed normal for ray */ |
439 |
+ |
FVECT norm, |
440 |
+ |
RAY *r |
441 |
+ |
) |
442 |
+ |
{ |
443 |
|
double newdot; |
444 |
< |
register int i; |
444 |
> |
int i; |
445 |
|
|
446 |
|
/* The perturbation is added to the surface normal to obtain |
447 |
|
* the new normal. If the new normal would affect the surface |
449 |
|
* still fraught with problems since reflected rays and similar |
450 |
|
* directions calculated from the surface normal may spawn rays behind |
451 |
|
* the surface. The only solution is to curb textures at high |
452 |
< |
* incidence (Rdot << 1). |
452 |
> |
* incidence (namely, keep DOT(rdir,pert) < Rdot). |
453 |
|
*/ |
454 |
|
|
455 |
|
for (i = 0; i < 3; i++) |
470 |
|
} |
471 |
|
|
472 |
|
|
473 |
< |
flipsurface(r) /* reverse surface orientation */ |
474 |
< |
register RAY *r; |
473 |
> |
void |
474 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
475 |
> |
RAY *r |
476 |
> |
) |
477 |
|
{ |
478 |
+ |
static struct xfn { |
479 |
+ |
struct xfn *next; |
480 |
+ |
FULLXF xf; |
481 |
+ |
} xfseed = { &xfseed }, *xflast = &xfseed; |
482 |
+ |
struct xfn *xp; |
483 |
+ |
const RAY *rp; |
484 |
+ |
|
485 |
+ |
/* |
486 |
+ |
* Search for transform in circular list that |
487 |
+ |
* has no associated ray in the tree. |
488 |
+ |
*/ |
489 |
+ |
xp = xflast; |
490 |
+ |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
491 |
+ |
if (rp->rox == &xp->xf) { /* xp in use */ |
492 |
+ |
xp = xp->next; /* move to next */ |
493 |
+ |
if (xp == xflast) { /* need new one */ |
494 |
+ |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
495 |
+ |
if (xp == NULL) |
496 |
+ |
error(SYSTEM, |
497 |
+ |
"out of memory in newrayxf"); |
498 |
+ |
/* insert in list */ |
499 |
+ |
xp->next = xflast->next; |
500 |
+ |
xflast->next = xp; |
501 |
+ |
break; /* we're done */ |
502 |
+ |
} |
503 |
+ |
rp = r; /* start check over */ |
504 |
+ |
} |
505 |
+ |
/* got it */ |
506 |
+ |
r->rox = &xp->xf; |
507 |
+ |
xflast = xp; |
508 |
+ |
} |
509 |
+ |
|
510 |
+ |
|
511 |
+ |
void |
512 |
+ |
flipsurface( /* reverse surface orientation */ |
513 |
+ |
RAY *r |
514 |
+ |
) |
515 |
+ |
{ |
516 |
|
r->rod = -r->rod; |
517 |
|
r->ron[0] = -r->ron[0]; |
518 |
|
r->ron[1] = -r->ron[1]; |
520 |
|
r->pert[0] = -r->pert[0]; |
521 |
|
r->pert[1] = -r->pert[1]; |
522 |
|
r->pert[2] = -r->pert[2]; |
523 |
+ |
r->rflips++; |
524 |
|
} |
525 |
|
|
526 |
|
|
527 |
< |
localhit(r, scene) /* check for hit in the octree */ |
528 |
< |
register RAY *r; |
529 |
< |
register CUBE *scene; |
527 |
> |
int |
528 |
> |
rayreject( /* check if candidate hit is worse than current */ |
529 |
> |
OBJREC *o, |
530 |
> |
RAY *r, |
531 |
> |
double t, |
532 |
> |
double rod |
533 |
> |
) |
534 |
|
{ |
535 |
+ |
OBJREC *mnew, *mray; |
536 |
+ |
|
537 |
+ |
if ((t <= FTINY) | (t > r->rot + FTINY)) |
538 |
+ |
return(1); |
539 |
+ |
if (t < r->rot - FTINY) /* is new hit significantly closer? */ |
540 |
+ |
return(0); |
541 |
+ |
/* coincident point, so decide... */ |
542 |
+ |
if (o == r->ro) |
543 |
+ |
return(1); /* shouldn't happen */ |
544 |
+ |
if (r->ro == NULL) |
545 |
+ |
return(0); /* ditto */ |
546 |
+ |
mnew = findmaterial(o); |
547 |
+ |
mray = findmaterial(r->ro); /* check material transparencies */ |
548 |
+ |
if (mnew == NULL) { |
549 |
+ |
if (mray != NULL) |
550 |
+ |
return(1); /* old has material, new does not */ |
551 |
+ |
} else if (mray == NULL) { |
552 |
+ |
return(0); /* new has material, old does not */ |
553 |
+ |
} else if (istransp(mnew->otype)) { |
554 |
+ |
if (!istransp(mray->otype)) |
555 |
+ |
return(1); /* new is transparent, old is not */ |
556 |
+ |
} else if (istransp(mray->otype)) { |
557 |
+ |
return(0); /* old is transparent, new is not */ |
558 |
+ |
} |
559 |
+ |
if (rod <= 0) { /* check which side we hit */ |
560 |
+ |
if (r->rod > 0) |
561 |
+ |
return(1); /* old hit front, new did not */ |
562 |
+ |
} else if (r->rod <= 0) { |
563 |
+ |
return(0); /* new hit front, old did not */ |
564 |
+ |
} |
565 |
+ |
/* earlier modifier definition wins tie */ |
566 |
+ |
return (r->ro->omod >= o->omod); |
567 |
+ |
} |
568 |
+ |
|
569 |
+ |
void |
570 |
+ |
rayhit( /* standard ray hit test */ |
571 |
+ |
OBJECT *oset, |
572 |
+ |
RAY *r |
573 |
+ |
) |
574 |
+ |
{ |
575 |
+ |
OBJREC *o; |
576 |
+ |
int i; |
577 |
+ |
|
578 |
+ |
for (i = oset[0]; i > 0; i--) { |
579 |
+ |
o = objptr(oset[i]); |
580 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
581 |
+ |
r->robj = oset[i]; |
582 |
+ |
} |
583 |
+ |
} |
584 |
+ |
|
585 |
+ |
|
586 |
+ |
int |
587 |
+ |
localhit( /* check for hit in the octree */ |
588 |
+ |
RAY *r, |
589 |
+ |
CUBE *scene |
590 |
+ |
) |
591 |
+ |
{ |
592 |
+ |
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
593 |
|
FVECT curpos; /* current cube position */ |
594 |
< |
int mpos, mneg; /* sign flags */ |
594 |
> |
int sflags; /* sign flags */ |
595 |
|
double t, dt; |
596 |
< |
register int i; |
596 |
> |
int i; |
597 |
|
|
598 |
|
nrays++; /* increment trace counter */ |
599 |
< |
|
253 |
< |
mpos = mneg = 0; |
599 |
> |
sflags = 0; |
600 |
|
for (i = 0; i < 3; i++) { |
601 |
|
curpos[i] = r->rorg[i]; |
602 |
< |
if (r->rdir[i] > FTINY) |
603 |
< |
mpos |= 1 << i; |
604 |
< |
else if (r->rdir[i] < -FTINY) |
605 |
< |
mneg |= 1 << i; |
602 |
> |
if (r->rdir[i] > 1e-7) |
603 |
> |
sflags |= 1 << i; |
604 |
> |
else if (r->rdir[i] < -1e-7) |
605 |
> |
sflags |= 0x10 << i; |
606 |
|
} |
607 |
+ |
if (!sflags) { |
608 |
+ |
error(WARNING, "zero ray direction in localhit"); |
609 |
+ |
return(0); |
610 |
+ |
} |
611 |
+ |
/* start off assuming nothing hit */ |
612 |
+ |
if (r->rmax > FTINY) { /* except aft plane if one */ |
613 |
+ |
r->ro = &Aftplane; |
614 |
+ |
r->rot = r->rmax; |
615 |
+ |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
616 |
+ |
} |
617 |
+ |
/* find global cube entrance point */ |
618 |
|
t = 0.0; |
619 |
|
if (!incube(scene, curpos)) { |
620 |
|
/* find distance to entry */ |
621 |
|
for (i = 0; i < 3; i++) { |
622 |
|
/* plane in our direction */ |
623 |
< |
if (mpos & 1<<i) |
623 |
> |
if (sflags & 1<<i) |
624 |
|
dt = scene->cuorg[i]; |
625 |
< |
else if (mneg & 1<<i) |
625 |
> |
else if (sflags & 0x10<<i) |
626 |
|
dt = scene->cuorg[i] + scene->cusize; |
627 |
|
else |
628 |
|
continue; |
632 |
|
t = dt; /* farthest face is the one */ |
633 |
|
} |
634 |
|
t += FTINY; /* fudge to get inside cube */ |
635 |
+ |
if (t >= r->rot) /* clipped already */ |
636 |
+ |
return(0); |
637 |
|
/* advance position */ |
638 |
< |
for (i = 0; i < 3; i++) |
280 |
< |
curpos[i] += r->rdir[i]*t; |
638 |
> |
VSUM(curpos, curpos, r->rdir, t); |
639 |
|
|
640 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
641 |
|
return(0); |
642 |
|
} |
643 |
< |
return(raymove(curpos, mpos, mneg, r, scene) == RAYHIT); |
643 |
> |
cxset[0] = 0; |
644 |
> |
raymove(curpos, cxset, sflags, r, scene); |
645 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
646 |
|
} |
647 |
|
|
648 |
|
|
649 |
|
static int |
650 |
< |
raymove(pos, plus, minus, r, cu) /* check for hit as we move */ |
651 |
< |
FVECT pos; /* modified */ |
652 |
< |
int plus, minus; /* direction indicators to speed tests */ |
653 |
< |
register RAY *r; |
654 |
< |
register CUBE *cu; |
650 |
> |
raymove( /* check for hit as we move */ |
651 |
> |
FVECT pos, /* current position, modified herein */ |
652 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
653 |
> |
int dirf, /* direction indicators to speed tests */ |
654 |
> |
RAY *r, |
655 |
> |
CUBE *cu |
656 |
> |
) |
657 |
|
{ |
658 |
|
int ax; |
659 |
|
double dt, t; |
298 |
– |
register int sgn; |
660 |
|
|
661 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
662 |
|
CUBE cukid; |
663 |
< |
register int br; |
663 |
> |
int br, sgn; |
664 |
|
|
665 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
666 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
679 |
|
} |
680 |
|
for ( ; ; ) { |
681 |
|
cukid.cutree = octkid(cu->cutree, br); |
682 |
< |
if ((ax = raymove(pos,plus,minus,r,&cukid)) == RAYHIT) |
682 |
> |
if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
683 |
|
return(RAYHIT); |
684 |
|
sgn = 1 << ax; |
685 |
< |
if (sgn & minus) /* negative axis? */ |
325 |
< |
if (sgn & br) { |
326 |
< |
cukid.cuorg[ax] -= cukid.cusize; |
327 |
< |
br &= ~sgn; |
328 |
< |
} else |
329 |
< |
return(ax); /* underflow */ |
330 |
< |
else |
685 |
> |
if (sgn & dirf) /* positive axis? */ |
686 |
|
if (sgn & br) |
687 |
|
return(ax); /* overflow */ |
688 |
|
else { |
689 |
|
cukid.cuorg[ax] += cukid.cusize; |
690 |
|
br |= sgn; |
691 |
|
} |
692 |
+ |
else |
693 |
+ |
if (sgn & br) { |
694 |
+ |
cukid.cuorg[ax] -= cukid.cusize; |
695 |
+ |
br &= ~sgn; |
696 |
+ |
} else |
697 |
+ |
return(ax); /* underflow */ |
698 |
|
} |
699 |
|
/*NOTREACHED*/ |
700 |
|
} |
701 |
< |
if (isfull(cu->cutree) && checkhit(r, cu)) |
701 |
> |
if (isfull(cu->cutree)) { |
702 |
> |
if (checkhit(r, cu, cxs)) |
703 |
> |
return(RAYHIT); |
704 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
705 |
|
return(RAYHIT); |
706 |
|
/* advance to next cube */ |
707 |
< |
sgn = plus | minus; |
708 |
< |
if (sgn&1) { |
345 |
< |
dt = plus&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
707 |
> |
if (dirf&0x11) { |
708 |
> |
dt = dirf&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
709 |
|
t = (dt - pos[0])/r->rdir[0]; |
710 |
|
ax = 0; |
711 |
|
} else |
712 |
|
t = FHUGE; |
713 |
< |
if (sgn&2) { |
714 |
< |
dt = plus&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
713 |
> |
if (dirf&0x22) { |
714 |
> |
dt = dirf&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
715 |
|
dt = (dt - pos[1])/r->rdir[1]; |
716 |
|
if (dt < t) { |
717 |
|
t = dt; |
718 |
|
ax = 1; |
719 |
|
} |
720 |
|
} |
721 |
< |
if (sgn&4) { |
722 |
< |
dt = plus&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
721 |
> |
if (dirf&0x44) { |
722 |
> |
dt = dirf&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
723 |
|
dt = (dt - pos[2])/r->rdir[2]; |
724 |
|
if (dt < t) { |
725 |
|
t = dt; |
726 |
|
ax = 2; |
727 |
|
} |
728 |
|
} |
729 |
< |
pos[0] += r->rdir[0]*t; |
367 |
< |
pos[1] += r->rdir[1]*t; |
368 |
< |
pos[2] += r->rdir[2]*t; |
729 |
> |
VSUM(pos, pos, r->rdir, t); |
730 |
|
return(ax); |
731 |
|
} |
732 |
|
|
733 |
|
|
734 |
< |
static |
735 |
< |
checkhit(r, cu) /* check for hit in full cube */ |
736 |
< |
register RAY *r; |
737 |
< |
CUBE *cu; |
734 |
> |
static int |
735 |
> |
checkhit( /* check for hit in full cube */ |
736 |
> |
RAY *r, |
737 |
> |
CUBE *cu, |
738 |
> |
OBJECT *cxs |
739 |
> |
) |
740 |
|
{ |
741 |
|
OBJECT oset[MAXSET+1]; |
379 |
– |
register OBJREC *o; |
380 |
– |
register int i; |
742 |
|
|
743 |
|
objset(oset, cu->cutree); |
744 |
< |
for (i = oset[0]; i > 0; i--) { |
745 |
< |
o = objptr(oset[i]); |
746 |
< |
if (o->lastrno == r->rno) /* checked already? */ |
747 |
< |
continue; |
748 |
< |
(*ofun[o->otype].funp)(o, r); |
388 |
< |
o->lastrno = r->rno; |
389 |
< |
} |
390 |
< |
if (r->ro == NULL) |
744 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
745 |
> |
|
746 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
747 |
> |
|
748 |
> |
if (r->robj == OVOID) |
749 |
|
return(0); /* no scores yet */ |
750 |
|
|
751 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
752 |
+ |
} |
753 |
+ |
|
754 |
+ |
|
755 |
+ |
static void |
756 |
+ |
checkset( /* modify checked set and set to check */ |
757 |
+ |
OBJECT *os, /* os' = os - cs */ |
758 |
+ |
OBJECT *cs /* cs' = cs + os */ |
759 |
+ |
) |
760 |
+ |
{ |
761 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
762 |
+ |
int i, j; |
763 |
+ |
int k; |
764 |
+ |
/* copy os in place, cset <- cs */ |
765 |
+ |
cset[0] = 0; |
766 |
+ |
k = 0; |
767 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
768 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
769 |
+ |
cset[++cset[0]] = cs[j++]; |
770 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
771 |
+ |
os[++k] = os[i]; |
772 |
+ |
cset[++cset[0]] = os[i]; |
773 |
+ |
} |
774 |
+ |
} |
775 |
+ |
if (!(os[0] = k)) /* new "to check" set size */ |
776 |
+ |
return; /* special case */ |
777 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
778 |
+ |
cset[++cset[0]] = cs[j++]; |
779 |
+ |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
780 |
+ |
cset[0] = MAXCSET; |
781 |
+ |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
782 |
+ |
os = cset; |
783 |
+ |
for (i = os[0]; i-- >= 0; ) |
784 |
+ |
*cs++ = *os++; |
785 |
|
} |