1 |
– |
/* Copyright (c) 1991 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" |
18 |
– |
|
15 |
|
#include "otspecial.h" |
16 |
+ |
#include "random.h" |
17 |
+ |
#include "pmap.h" |
18 |
|
|
19 |
< |
extern CUBE thescene; /* our scene */ |
22 |
< |
extern int maxdepth; /* maximum recursion depth */ |
23 |
< |
extern double minweight; /* minimum ray weight */ |
24 |
< |
extern int do_irrad; /* compute irradiance? */ |
19 |
> |
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
20 |
|
|
21 |
< |
long raynum = 0L; /* next unique ray number */ |
22 |
< |
long nrays = 0L; /* number of calls to localhit */ |
21 |
> |
RNUMBER raynum = 0; /* next unique ray number */ |
22 |
> |
RNUMBER nrays = 0; /* number of calls to localhit */ |
23 |
|
|
24 |
< |
static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
24 |
> |
static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
25 |
|
OBJREC Lamb = { |
26 |
|
OVOID, MAT_PLASTIC, "Lambertian", |
27 |
< |
{0, 5, NULL, Lambfa}, NULL, -1, |
27 |
> |
{NULL, Lambfa, 0, 5}, NULL |
28 |
|
}; /* a Lambertian surface */ |
29 |
|
|
30 |
< |
#define MAXLOOP 128 /* modifier loop detection */ |
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 COLOR rc |
45 |
> |
) |
46 |
|
{ |
47 |
+ |
double rw, re; |
48 |
+ |
/* assign coefficient/weight */ |
49 |
+ |
if (rc == NULL) { |
50 |
+ |
rw = 1.0; |
51 |
+ |
setcolor(r->rcoef, 1., 1., 1.); |
52 |
+ |
} else { |
53 |
+ |
rw = intens(rc); |
54 |
+ |
if (rw > 1.0) |
55 |
+ |
rw = 1.0; /* avoid calculation growth */ |
56 |
+ |
if (rc != r->rcoef) |
57 |
+ |
copycolor(r->rcoef, rc); |
58 |
+ |
} |
59 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
60 |
|
r->rlvl = 0; |
61 |
|
r->rweight = rw; |
63 |
|
r->rsrc = -1; |
64 |
|
r->clipset = NULL; |
65 |
|
r->revf = raytrace; |
66 |
+ |
copycolor(r->cext, cextinction); |
67 |
+ |
copycolor(r->albedo, salbedo); |
68 |
+ |
r->gecc = seccg; |
69 |
+ |
r->slights = NULL; |
70 |
|
} else { /* spawned ray */ |
71 |
+ |
if (ro->rot >= FHUGE) { |
72 |
+ |
memset(r, 0, sizeof(RAY)); |
73 |
+ |
return(-1); /* illegal continuation */ |
74 |
+ |
} |
75 |
|
r->rlvl = ro->rlvl; |
76 |
|
if (rt & RAYREFL) { |
77 |
|
r->rlvl++; |
78 |
|
r->rsrc = -1; |
79 |
|
r->clipset = ro->clipset; |
80 |
+ |
r->rmax = 0.0; |
81 |
|
} else { |
82 |
|
r->rsrc = ro->rsrc; |
83 |
|
r->clipset = ro->newcset; |
84 |
+ |
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
85 |
|
} |
86 |
|
r->revf = ro->revf; |
87 |
< |
r->rweight = ro->rweight * rw; |
87 |
> |
copycolor(r->cext, ro->cext); |
88 |
> |
copycolor(r->albedo, ro->albedo); |
89 |
> |
r->gecc = ro->gecc; |
90 |
> |
r->slights = ro->slights; |
91 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
92 |
|
VCOPY(r->rorg, ro->rop); |
93 |
+ |
r->rweight = ro->rweight * rw; |
94 |
+ |
/* estimate extinction */ |
95 |
+ |
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
96 |
+ |
colval(ro->cext,RED) : colval(ro->cext,GRN); |
97 |
+ |
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
98 |
+ |
re *= ro->rot; |
99 |
+ |
if (re > 0.1) { |
100 |
+ |
if (re > 92.) { |
101 |
+ |
r->rweight = 0.0; |
102 |
+ |
} else { |
103 |
+ |
r->rweight *= exp(-re); |
104 |
+ |
} |
105 |
+ |
} |
106 |
|
} |
107 |
|
rayclear(r); |
108 |
< |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
108 |
> |
if (r->rweight <= 0.0) /* check for expiration */ |
109 |
> |
return(-1); |
110 |
> |
if (r->crtype & SHADOW) /* shadow commitment */ |
111 |
> |
return(0); |
112 |
> |
/* ambient in photon map? */ |
113 |
> |
if (ro != NULL && ro->crtype & AMBIENT) { |
114 |
> |
if (causticPhotonMapping) |
115 |
> |
return(-1); |
116 |
> |
if (photonMapping && rt != TRANS) |
117 |
> |
return(-1); |
118 |
> |
} |
119 |
> |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
120 |
> |
if (minweight <= 0.0) |
121 |
> |
error(USER, "zero ray weight in Russian roulette"); |
122 |
> |
if (maxdepth < 0 && r->rlvl > -maxdepth) |
123 |
> |
return(-1); /* upper reflection limit */ |
124 |
> |
if (r->rweight >= minweight) |
125 |
> |
return(0); |
126 |
> |
if (frandom() > r->rweight/minweight) |
127 |
> |
return(-1); |
128 |
> |
rw = minweight/r->rweight; /* promote survivor */ |
129 |
> |
scalecolor(r->rcoef, rw); |
130 |
> |
r->rweight = minweight; |
131 |
> |
return(0); |
132 |
> |
} |
133 |
> |
return(r->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1); |
134 |
|
} |
135 |
|
|
136 |
|
|
137 |
< |
rayclear(r) /* clear a ray for (re)evaluation */ |
138 |
< |
register RAY *r; |
137 |
> |
void |
138 |
> |
rayclear( /* clear a ray for (re)evaluation */ |
139 |
> |
RAY *r |
140 |
> |
) |
141 |
|
{ |
142 |
|
r->rno = raynum++; |
143 |
|
r->newcset = r->clipset; |
144 |
+ |
r->hitf = rayhit; |
145 |
+ |
r->robj = OVOID; |
146 |
|
r->ro = NULL; |
147 |
< |
r->rot = FHUGE; |
147 |
> |
r->rox = NULL; |
148 |
> |
r->rxt = r->rmt = r->rot = FHUGE; |
149 |
|
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
150 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
151 |
|
setcolor(r->pcol, 1.0, 1.0, 1.0); |
152 |
+ |
setcolor(r->mcol, 0.0, 0.0, 0.0); |
153 |
|
setcolor(r->rcol, 0.0, 0.0, 0.0); |
82 |
– |
r->rt = 0.0; |
154 |
|
} |
155 |
|
|
156 |
|
|
157 |
< |
raytrace(r) /* trace a ray and compute its value */ |
158 |
< |
RAY *r; |
157 |
> |
void |
158 |
> |
raytrace( /* trace a ray and compute its value */ |
159 |
> |
RAY *r |
160 |
> |
) |
161 |
|
{ |
89 |
– |
extern int (*trace)(); |
90 |
– |
|
162 |
|
if (localhit(r, &thescene)) |
163 |
< |
raycont(r); |
164 |
< |
else if (sourcehit(r)) |
165 |
< |
rayshade(r, r->ro->omod); |
163 |
> |
raycont(r); /* hit local surface, evaluate */ |
164 |
> |
else if (r->ro == &Aftplane) { |
165 |
> |
r->ro = NULL; /* hit aft clipping plane */ |
166 |
> |
r->rot = FHUGE; |
167 |
> |
} else if (sourcehit(r)) |
168 |
> |
rayshade(r, r->ro->omod); /* distant source */ |
169 |
|
|
170 |
|
if (trace != NULL) |
171 |
|
(*trace)(r); /* trace execution */ |
172 |
+ |
|
173 |
+ |
rayparticipate(r); /* for participating medium */ |
174 |
|
} |
175 |
|
|
176 |
|
|
177 |
< |
raycont(r) /* check for clipped object and continue */ |
178 |
< |
register RAY *r; |
177 |
> |
void |
178 |
> |
raycont( /* check for clipped object and continue */ |
179 |
> |
RAY *r |
180 |
> |
) |
181 |
|
{ |
182 |
< |
if (r->clipset != NULL && inset(r->clipset, r->ro->omod)) |
182 |
> |
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
183 |
> |
!rayshade(r, r->ro->omod)) |
184 |
|
raytrans(r); |
106 |
– |
else |
107 |
– |
rayshade(r, r->ro->omod); |
185 |
|
} |
186 |
|
|
187 |
|
|
188 |
< |
raytrans(r) /* transmit ray as is */ |
189 |
< |
register RAY *r; |
188 |
> |
void |
189 |
> |
raytrans( /* transmit ray as is */ |
190 |
> |
RAY *r |
191 |
> |
) |
192 |
|
{ |
193 |
|
RAY tr; |
194 |
|
|
195 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
196 |
< |
VCOPY(tr.rdir, r->rdir); |
197 |
< |
rayvalue(&tr); |
198 |
< |
copycolor(r->rcol, tr.rcol); |
199 |
< |
r->rt = r->rot + tr.rt; |
200 |
< |
} |
195 |
> |
rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
196 |
> |
VCOPY(tr.rdir, r->rdir); |
197 |
> |
rayvalue(&tr); |
198 |
> |
copycolor(r->rcol, tr.rcol); |
199 |
> |
r->rmt = r->rot + tr.rmt; |
200 |
> |
r->rxt = r->rot + tr.rxt; |
201 |
|
} |
202 |
|
|
203 |
|
|
204 |
< |
rayshade(r, mod) /* shade ray r with material mod */ |
205 |
< |
register RAY *r; |
206 |
< |
int mod; |
204 |
> |
int |
205 |
> |
rayshade( /* shade ray r with material mod */ |
206 |
> |
RAY *r, |
207 |
> |
int mod |
208 |
> |
) |
209 |
|
{ |
210 |
< |
static int depth = 0; |
211 |
< |
register OBJREC *m; |
212 |
< |
/* check for infinite loop */ |
132 |
< |
if (depth++ >= MAXLOOP) |
133 |
< |
objerror(r->ro, USER, "possible modifier loop"); |
134 |
< |
r->rt = r->rot; /* set effective ray length */ |
210 |
> |
OBJREC *m; |
211 |
> |
|
212 |
> |
r->rxt = r->rmt = r->rot; /* preset effective ray length */ |
213 |
|
for ( ; mod != OVOID; mod = m->omod) { |
214 |
|
m = objptr(mod); |
215 |
|
/****** unnecessary test since modifier() is always called |
219 |
|
} |
220 |
|
******/ |
221 |
|
/* hack for irradiance calculation */ |
222 |
< |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
223 |
< |
if (irr_ignore(m->otype)) { |
224 |
< |
depth--; |
222 |
> |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
223 |
> |
(ofun[m->otype].flags & (T_M|T_X)) && |
224 |
> |
m->otype != MAT_CLIP) { |
225 |
> |
if (istransp(m->otype) || isBSDFproxy(m)) { |
226 |
|
raytrans(r); |
227 |
< |
return; |
227 |
> |
return(1); |
228 |
|
} |
229 |
|
if (!islight(m->otype)) |
230 |
|
m = &Lamb; |
231 |
|
} |
232 |
< |
(*ofun[m->otype].funp)(m, r); /* execute function */ |
233 |
< |
m->lastrno = r->rno; |
155 |
< |
if (ismaterial(m->otype)) { /* materials call raytexture */ |
156 |
< |
depth--; |
157 |
< |
return; /* we're done */ |
158 |
< |
} |
232 |
> |
if ((*ofun[m->otype].funp)(m, r)) |
233 |
> |
return(1); /* materials call raytexture() */ |
234 |
|
} |
235 |
< |
objerror(r->ro, USER, "material not found"); |
235 |
> |
return(0); /* no material! */ |
236 |
|
} |
237 |
|
|
238 |
|
|
239 |
< |
raytexture(r, mod) /* get material modifiers */ |
240 |
< |
RAY *r; |
241 |
< |
int mod; |
239 |
> |
void |
240 |
> |
rayparticipate( /* compute ray medium participation */ |
241 |
> |
RAY *r |
242 |
> |
) |
243 |
|
{ |
244 |
< |
static int depth = 0; |
245 |
< |
register OBJREC *m; |
246 |
< |
/* check for infinite loop */ |
247 |
< |
if (depth++ >= MAXLOOP) |
248 |
< |
objerror(r->ro, USER, "modifier loop"); |
244 |
> |
COLOR ce, ca; |
245 |
> |
double re, ge, be; |
246 |
> |
|
247 |
> |
if (intens(r->cext) <= 1./FHUGE) |
248 |
> |
return; /* no medium */ |
249 |
> |
re = r->rot*colval(r->cext,RED); |
250 |
> |
ge = r->rot*colval(r->cext,GRN); |
251 |
> |
be = r->rot*colval(r->cext,BLU); |
252 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
253 |
> |
re *= 1. - colval(r->albedo,RED); |
254 |
> |
ge *= 1. - colval(r->albedo,GRN); |
255 |
> |
be *= 1. - colval(r->albedo,BLU); |
256 |
> |
} |
257 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
258 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
259 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
260 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
261 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
262 |
> |
return; /* no scattering */ |
263 |
> |
|
264 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
265 |
> |
if (!volumePhotonMapping) { |
266 |
> |
setcolor(ca, |
267 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
268 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
269 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
270 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
271 |
> |
} |
272 |
> |
|
273 |
> |
srcscatter(r); /* source in scattering */ |
274 |
> |
} |
275 |
> |
|
276 |
> |
|
277 |
> |
void |
278 |
> |
raytexture( /* get material modifiers */ |
279 |
> |
RAY *r, |
280 |
> |
OBJECT mod |
281 |
> |
) |
282 |
> |
{ |
283 |
> |
OBJREC *m; |
284 |
|
/* execute textures and patterns */ |
285 |
|
for ( ; mod != OVOID; mod = m->omod) { |
286 |
|
m = objptr(mod); |
287 |
< |
if (!istexture(m->otype)) { |
287 |
> |
/****** unnecessary test since modifier() is always called |
288 |
> |
if (!ismodifier(m->otype)) { |
289 |
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
290 |
|
error(USER, errmsg); |
291 |
|
} |
292 |
< |
(*ofun[m->otype].funp)(m, r); |
293 |
< |
m->lastrno = r->rno; |
292 |
> |
******/ |
293 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
294 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
295 |
> |
m->oname); |
296 |
> |
objerror(r->ro, USER, errmsg); |
297 |
> |
} |
298 |
|
} |
183 |
– |
depth--; /* end here */ |
299 |
|
} |
300 |
|
|
301 |
|
|
302 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
303 |
< |
register RAY *r; |
304 |
< |
OBJECT fore, back; |
305 |
< |
double coef; |
302 |
> |
int |
303 |
> |
raymixture( /* mix modifiers */ |
304 |
> |
RAY *r, |
305 |
> |
OBJECT fore, |
306 |
> |
OBJECT back, |
307 |
> |
double coef |
308 |
> |
) |
309 |
|
{ |
310 |
< |
FVECT curpert, forepert, backpert; |
311 |
< |
COLOR curpcol, forepcol, backpcol; |
312 |
< |
register int i; |
313 |
< |
/* clip coefficient */ |
310 |
> |
RAY fr, br; |
311 |
> |
double mfore, mback; |
312 |
> |
int foremat, backmat; |
313 |
> |
int i; |
314 |
> |
/* bound coefficient */ |
315 |
|
if (coef > 1.0) |
316 |
|
coef = 1.0; |
317 |
|
else if (coef < 0.0) |
318 |
|
coef = 0.0; |
319 |
< |
/* save current mods */ |
320 |
< |
VCOPY(curpert, r->pert); |
321 |
< |
copycolor(curpcol, r->pcol); |
322 |
< |
/* compute new mods */ |
323 |
< |
/* foreground */ |
324 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
325 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
326 |
< |
if (fore != OVOID && coef > FTINY) |
327 |
< |
raytexture(r, fore); |
328 |
< |
VCOPY(forepert, r->pert); |
329 |
< |
copycolor(forepcol, r->pcol); |
330 |
< |
/* background */ |
331 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
332 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
333 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
334 |
< |
raytexture(r, back); |
335 |
< |
VCOPY(backpert, r->pert); |
336 |
< |
copycolor(backpcol, r->pcol); |
337 |
< |
/* sum perturbations */ |
319 |
> |
/* compute foreground and background */ |
320 |
> |
foremat = backmat = 0; |
321 |
> |
/* foreground */ |
322 |
> |
fr = *r; |
323 |
> |
if (coef > FTINY) { |
324 |
> |
fr.rweight *= coef; |
325 |
> |
scalecolor(fr.rcoef, coef); |
326 |
> |
foremat = rayshade(&fr, fore); |
327 |
> |
} |
328 |
> |
/* background */ |
329 |
> |
br = *r; |
330 |
> |
if (coef < 1.0-FTINY) { |
331 |
> |
br.rweight *= 1.0-coef; |
332 |
> |
scalecolor(br.rcoef, 1.0-coef); |
333 |
> |
backmat = rayshade(&br, back); |
334 |
> |
} |
335 |
> |
/* check for transparency */ |
336 |
> |
if (backmat ^ foremat) { |
337 |
> |
if (backmat && coef > FTINY) |
338 |
> |
raytrans(&fr); |
339 |
> |
else if (foremat && coef < 1.0-FTINY) |
340 |
> |
raytrans(&br); |
341 |
> |
} |
342 |
> |
/* mix perturbations */ |
343 |
|
for (i = 0; i < 3; i++) |
344 |
< |
r->pert[i] = curpert[i] + coef*forepert[i] + |
345 |
< |
(1.0-coef)*backpert[i]; |
346 |
< |
/* multiply colors */ |
347 |
< |
setcolor(r->pcol, coef*colval(forepcol,RED) + |
348 |
< |
(1.0-coef)*colval(backpcol,RED), |
349 |
< |
coef*colval(forepcol,GRN) + |
350 |
< |
(1.0-coef)*colval(backpcol,GRN), |
351 |
< |
coef*colval(forepcol,BLU) + |
352 |
< |
(1.0-coef)*colval(backpcol,BLU)); |
353 |
< |
multcolor(r->pcol, curpcol); |
344 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
345 |
> |
/* mix pattern colors */ |
346 |
> |
scalecolor(fr.pcol, coef); |
347 |
> |
scalecolor(br.pcol, 1.0-coef); |
348 |
> |
copycolor(r->pcol, fr.pcol); |
349 |
> |
addcolor(r->pcol, br.pcol); |
350 |
> |
/* return value tells if material */ |
351 |
> |
if (!foremat & !backmat) |
352 |
> |
return(0); |
353 |
> |
/* mix returned ray values */ |
354 |
> |
scalecolor(fr.rcol, coef); |
355 |
> |
scalecolor(br.rcol, 1.0-coef); |
356 |
> |
copycolor(r->rcol, fr.rcol); |
357 |
> |
addcolor(r->rcol, br.rcol); |
358 |
> |
mfore = bright(fr.mcol); mback = bright(br.mcol); |
359 |
> |
r->rmt = mfore > mback ? fr.rmt : br.rmt; |
360 |
> |
r->rxt = bright(fr.rcol)-mfore > bright(br.rcol)-mback ? |
361 |
> |
fr.rxt : br.rxt; |
362 |
> |
return(1); |
363 |
|
} |
364 |
|
|
365 |
|
|
366 |
|
double |
367 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
368 |
< |
FVECT norm; |
369 |
< |
register RAY *r; |
367 |
> |
raydist( /* compute (cumulative) ray distance */ |
368 |
> |
const RAY *r, |
369 |
> |
int flags |
370 |
> |
) |
371 |
|
{ |
372 |
+ |
double sum = 0.0; |
373 |
+ |
|
374 |
+ |
while (r != NULL && r->crtype&flags) { |
375 |
+ |
sum += r->rot; |
376 |
+ |
r = r->parent; |
377 |
+ |
} |
378 |
+ |
return(sum); |
379 |
+ |
} |
380 |
+ |
|
381 |
+ |
|
382 |
+ |
void |
383 |
+ |
raycontrib( /* compute (cumulative) ray contribution */ |
384 |
+ |
RREAL rc[3], |
385 |
+ |
const RAY *r, |
386 |
+ |
int flags |
387 |
+ |
) |
388 |
+ |
{ |
389 |
+ |
double eext[3]; |
390 |
+ |
int i; |
391 |
+ |
|
392 |
+ |
eext[0] = eext[1] = eext[2] = 0.; |
393 |
+ |
rc[0] = rc[1] = rc[2] = 1.; |
394 |
+ |
|
395 |
+ |
while (r != NULL && r->crtype&flags) { |
396 |
+ |
for (i = 3; i--; ) { |
397 |
+ |
rc[i] *= colval(r->rcoef,i); |
398 |
+ |
eext[i] += r->rot * colval(r->cext,i); |
399 |
+ |
} |
400 |
+ |
r = r->parent; |
401 |
+ |
} |
402 |
+ |
for (i = 3; i--; ) |
403 |
+ |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
404 |
+ |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
405 |
+ |
} |
406 |
+ |
|
407 |
+ |
|
408 |
+ |
double |
409 |
+ |
raynormal( /* compute perturbed normal for ray */ |
410 |
+ |
FVECT norm, |
411 |
+ |
RAY *r |
412 |
+ |
) |
413 |
+ |
{ |
414 |
|
double newdot; |
415 |
< |
register int i; |
415 |
> |
int i; |
416 |
|
|
417 |
|
/* The perturbation is added to the surface normal to obtain |
418 |
|
* the new normal. If the new normal would affect the surface |
441 |
|
} |
442 |
|
|
443 |
|
|
444 |
< |
newrayxf(r) /* get new tranformation matrix for ray */ |
445 |
< |
RAY *r; |
444 |
> |
void |
445 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
446 |
> |
RAY *r |
447 |
> |
) |
448 |
|
{ |
449 |
|
static struct xfn { |
450 |
|
struct xfn *next; |
451 |
|
FULLXF xf; |
452 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
453 |
< |
register struct xfn *xp; |
454 |
< |
register RAY *rp; |
453 |
> |
struct xfn *xp; |
454 |
> |
const RAY *rp; |
455 |
|
|
456 |
|
/* |
457 |
|
* Search for transform in circular list that |
479 |
|
} |
480 |
|
|
481 |
|
|
482 |
< |
flipsurface(r) /* reverse surface orientation */ |
483 |
< |
register RAY *r; |
482 |
> |
void |
483 |
> |
flipsurface( /* reverse surface orientation */ |
484 |
> |
RAY *r |
485 |
> |
) |
486 |
|
{ |
487 |
|
r->rod = -r->rod; |
488 |
|
r->ron[0] = -r->ron[0]; |
494 |
|
} |
495 |
|
|
496 |
|
|
497 |
< |
localhit(r, scene) /* check for hit in the octree */ |
498 |
< |
register RAY *r; |
499 |
< |
register CUBE *scene; |
497 |
> |
void |
498 |
> |
rayhit( /* standard ray hit test */ |
499 |
> |
OBJECT *oset, |
500 |
> |
RAY *r |
501 |
> |
) |
502 |
|
{ |
503 |
+ |
OBJREC *o; |
504 |
+ |
int i; |
505 |
+ |
|
506 |
+ |
for (i = oset[0]; i > 0; i--) { |
507 |
+ |
o = objptr(oset[i]); |
508 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
509 |
+ |
r->robj = oset[i]; |
510 |
+ |
} |
511 |
+ |
} |
512 |
+ |
|
513 |
+ |
|
514 |
+ |
int |
515 |
+ |
localhit( /* check for hit in the octree */ |
516 |
+ |
RAY *r, |
517 |
+ |
CUBE *scene |
518 |
+ |
) |
519 |
+ |
{ |
520 |
+ |
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
521 |
|
FVECT curpos; /* current cube position */ |
522 |
|
int sflags; /* sign flags */ |
523 |
|
double t, dt; |
524 |
< |
register int i; |
524 |
> |
int i; |
525 |
|
|
526 |
|
nrays++; /* increment trace counter */ |
527 |
|
sflags = 0; |
528 |
|
for (i = 0; i < 3; i++) { |
529 |
|
curpos[i] = r->rorg[i]; |
530 |
< |
if (r->rdir[i] > FTINY) |
530 |
> |
if (r->rdir[i] > 1e-7) |
531 |
|
sflags |= 1 << i; |
532 |
< |
else if (r->rdir[i] < -FTINY) |
532 |
> |
else if (r->rdir[i] < -1e-7) |
533 |
|
sflags |= 0x10 << i; |
534 |
|
} |
535 |
< |
if (sflags == 0) |
536 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
535 |
> |
if (!sflags) { |
536 |
> |
error(WARNING, "zero ray direction in localhit"); |
537 |
> |
return(0); |
538 |
> |
} |
539 |
> |
/* start off assuming nothing hit */ |
540 |
> |
if (r->rmax > FTINY) { /* except aft plane if one */ |
541 |
> |
r->ro = &Aftplane; |
542 |
> |
r->rot = r->rmax; |
543 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
544 |
> |
} |
545 |
> |
/* find global cube entrance point */ |
546 |
|
t = 0.0; |
547 |
|
if (!incube(scene, curpos)) { |
548 |
|
/* find distance to entry */ |
560 |
|
t = dt; /* farthest face is the one */ |
561 |
|
} |
562 |
|
t += FTINY; /* fudge to get inside cube */ |
563 |
+ |
if (t >= r->rot) /* clipped already */ |
564 |
+ |
return(0); |
565 |
|
/* advance position */ |
566 |
< |
for (i = 0; i < 3; i++) |
356 |
< |
curpos[i] += r->rdir[i]*t; |
566 |
> |
VSUM(curpos, curpos, r->rdir, t); |
567 |
|
|
568 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
569 |
|
return(0); |
570 |
|
} |
571 |
< |
return(raymove(curpos, sflags, r, scene) == RAYHIT); |
571 |
> |
cxset[0] = 0; |
572 |
> |
raymove(curpos, cxset, sflags, r, scene); |
573 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
574 |
|
} |
575 |
|
|
576 |
|
|
577 |
|
static int |
578 |
< |
raymove(pos, dirf, r, cu) /* check for hit as we move */ |
579 |
< |
FVECT pos; /* modified */ |
580 |
< |
int dirf; /* direction indicators to speed tests */ |
581 |
< |
register RAY *r; |
582 |
< |
register CUBE *cu; |
578 |
> |
raymove( /* check for hit as we move */ |
579 |
> |
FVECT pos, /* current position, modified herein */ |
580 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
581 |
> |
int dirf, /* direction indicators to speed tests */ |
582 |
> |
RAY *r, |
583 |
> |
CUBE *cu |
584 |
> |
) |
585 |
|
{ |
586 |
|
int ax; |
587 |
|
double dt, t; |
588 |
|
|
589 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
590 |
|
CUBE cukid; |
591 |
< |
register int br, sgn; |
591 |
> |
int br, sgn; |
592 |
|
|
593 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
594 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
607 |
|
} |
608 |
|
for ( ; ; ) { |
609 |
|
cukid.cutree = octkid(cu->cutree, br); |
610 |
< |
if ((ax = raymove(pos,dirf,r,&cukid)) == RAYHIT) |
610 |
> |
if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
611 |
|
return(RAYHIT); |
612 |
|
sgn = 1 << ax; |
613 |
|
if (sgn & dirf) /* positive axis? */ |
626 |
|
} |
627 |
|
/*NOTREACHED*/ |
628 |
|
} |
629 |
< |
if (isfull(cu->cutree) && checkhit(r, cu)) |
629 |
> |
if (isfull(cu->cutree)) { |
630 |
> |
if (checkhit(r, cu, cxs)) |
631 |
> |
return(RAYHIT); |
632 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
633 |
|
return(RAYHIT); |
634 |
|
/* advance to next cube */ |
635 |
|
if (dirf&0x11) { |
654 |
|
ax = 2; |
655 |
|
} |
656 |
|
} |
657 |
< |
pos[0] += r->rdir[0]*t; |
441 |
< |
pos[1] += r->rdir[1]*t; |
442 |
< |
pos[2] += r->rdir[2]*t; |
657 |
> |
VSUM(pos, pos, r->rdir, t); |
658 |
|
return(ax); |
659 |
|
} |
660 |
|
|
661 |
|
|
662 |
< |
static |
663 |
< |
checkhit(r, cu) /* check for hit in full cube */ |
664 |
< |
register RAY *r; |
665 |
< |
CUBE *cu; |
662 |
> |
static int |
663 |
> |
checkhit( /* check for hit in full cube */ |
664 |
> |
RAY *r, |
665 |
> |
CUBE *cu, |
666 |
> |
OBJECT *cxs |
667 |
> |
) |
668 |
|
{ |
669 |
|
OBJECT oset[MAXSET+1]; |
453 |
– |
register OBJREC *o; |
454 |
– |
register int i; |
670 |
|
|
671 |
|
objset(oset, cu->cutree); |
672 |
< |
for (i = oset[0]; i > 0; i--) { |
673 |
< |
o = objptr(oset[i]); |
674 |
< |
if (o->lastrno == r->rno) /* checked already? */ |
675 |
< |
continue; |
676 |
< |
(*ofun[o->otype].funp)(o, r); |
462 |
< |
o->lastrno = r->rno; |
463 |
< |
} |
464 |
< |
if (r->ro == NULL) |
672 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
673 |
> |
|
674 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
675 |
> |
|
676 |
> |
if (r->robj == OVOID) |
677 |
|
return(0); /* no scores yet */ |
678 |
|
|
679 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
680 |
+ |
} |
681 |
+ |
|
682 |
+ |
|
683 |
+ |
static void |
684 |
+ |
checkset( /* modify checked set and set to check */ |
685 |
+ |
OBJECT *os, /* os' = os - cs */ |
686 |
+ |
OBJECT *cs /* cs' = cs + os */ |
687 |
+ |
) |
688 |
+ |
{ |
689 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
690 |
+ |
int i, j; |
691 |
+ |
int k; |
692 |
+ |
/* copy os in place, cset <- cs */ |
693 |
+ |
cset[0] = 0; |
694 |
+ |
k = 0; |
695 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
696 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
697 |
+ |
cset[++cset[0]] = cs[j++]; |
698 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
699 |
+ |
os[++k] = os[i]; |
700 |
+ |
cset[++cset[0]] = os[i]; |
701 |
+ |
} |
702 |
+ |
} |
703 |
+ |
if (!(os[0] = k)) /* new "to check" set size */ |
704 |
+ |
return; /* special case */ |
705 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
706 |
+ |
cset[++cset[0]] = cs[j++]; |
707 |
+ |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
708 |
+ |
cset[0] = MAXCSET; |
709 |
+ |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
710 |
+ |
os = cset; |
711 |
+ |
for (i = os[0]; i-- >= 0; ) |
712 |
+ |
*cs++ = *os++; |
713 |
|
} |