1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.68 |
static const char RCSid[] = "$Id: raytrace.c,v 2.67 2015/05/21 15:28:24 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
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/* |
5 |
|
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* raytrace.c - routines for tracing and shading rays. |
6 |
|
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* |
7 |
greg |
2.34 |
* External symbols declared in ray.h |
8 |
|
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*/ |
9 |
|
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|
10 |
greg |
2.35 |
#include "copyright.h" |
11 |
greg |
1.1 |
|
12 |
|
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#include "ray.h" |
13 |
schorsch |
2.45 |
#include "source.h" |
14 |
greg |
1.1 |
#include "otypes.h" |
15 |
greg |
1.15 |
#include "otspecial.h" |
16 |
greg |
2.51 |
#include "random.h" |
17 |
greg |
2.66 |
#include "pmap.h" |
18 |
greg |
1.15 |
|
19 |
greg |
2.3 |
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
20 |
|
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|
21 |
greg |
2.60 |
RNUMBER raynum = 0; /* next unique ray number */ |
22 |
|
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RNUMBER nrays = 0; /* number of calls to localhit */ |
23 |
greg |
1.1 |
|
24 |
schorsch |
2.40 |
static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
25 |
greg |
1.15 |
OBJREC Lamb = { |
26 |
|
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OVOID, MAT_PLASTIC, "Lambertian", |
27 |
greg |
2.57 |
{NULL, Lambfa, 0, 5}, NULL |
28 |
greg |
1.15 |
}; /* a Lambertian surface */ |
29 |
|
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|
30 |
greg |
2.17 |
OBJREC Aftplane; /* aft clipping plane object */ |
31 |
greg |
2.16 |
|
32 |
schorsch |
2.45 |
#define RAYHIT (-1) /* return value for intercepted ray */ |
33 |
greg |
2.5 |
|
34 |
schorsch |
2.45 |
static int raymove(FVECT pos, OBJECT *cxs, int dirf, RAY *r, CUBE *cu); |
35 |
|
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static int checkhit(RAY *r, CUBE *cu, OBJECT *cxs); |
36 |
|
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static void checkset(OBJECT *os, OBJECT *cs); |
37 |
greg |
1.1 |
|
38 |
|
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|
39 |
greg |
2.65 |
int |
40 |
schorsch |
2.45 |
rayorigin( /* start new ray from old one */ |
41 |
greg |
2.49 |
RAY *r, |
42 |
schorsch |
2.45 |
int rt, |
43 |
greg |
2.49 |
const RAY *ro, |
44 |
|
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const COLOR rc |
45 |
schorsch |
2.45 |
) |
46 |
greg |
1.1 |
{ |
47 |
greg |
2.49 |
double rw, re; |
48 |
|
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/* assign coefficient/weight */ |
49 |
|
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if (rc == NULL) { |
50 |
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rw = 1.0; |
51 |
|
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setcolor(r->rcoef, 1., 1., 1.); |
52 |
|
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} else { |
53 |
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rw = intens(rc); |
54 |
|
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if (rc != r->rcoef) |
55 |
|
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copycolor(r->rcoef, rc); |
56 |
|
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} |
57 |
greg |
1.1 |
if ((r->parent = ro) == NULL) { /* primary ray */ |
58 |
|
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r->rlvl = 0; |
59 |
|
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r->rweight = rw; |
60 |
|
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r->crtype = r->rtype = rt; |
61 |
|
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r->rsrc = -1; |
62 |
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r->clipset = NULL; |
63 |
greg |
2.50 |
r->revf = raytrace; |
64 |
greg |
2.23 |
copycolor(r->cext, cextinction); |
65 |
greg |
2.26 |
copycolor(r->albedo, salbedo); |
66 |
greg |
2.23 |
r->gecc = seccg; |
67 |
|
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r->slights = NULL; |
68 |
greg |
1.1 |
} else { /* spawned ray */ |
69 |
greg |
2.49 |
if (ro->rot >= FHUGE) { |
70 |
|
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memset(r, 0, sizeof(RAY)); |
71 |
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return(-1); /* illegal continuation */ |
72 |
|
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} |
73 |
greg |
1.1 |
r->rlvl = ro->rlvl; |
74 |
|
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if (rt & RAYREFL) { |
75 |
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r->rlvl++; |
76 |
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r->rsrc = -1; |
77 |
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r->clipset = ro->clipset; |
78 |
greg |
2.22 |
r->rmax = 0.0; |
79 |
greg |
1.1 |
} else { |
80 |
|
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r->rsrc = ro->rsrc; |
81 |
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r->clipset = ro->newcset; |
82 |
greg |
2.22 |
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
83 |
greg |
1.1 |
} |
84 |
greg |
2.50 |
r->revf = ro->revf; |
85 |
greg |
2.23 |
copycolor(r->cext, ro->cext); |
86 |
greg |
2.26 |
copycolor(r->albedo, ro->albedo); |
87 |
greg |
2.23 |
r->gecc = ro->gecc; |
88 |
|
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r->slights = ro->slights; |
89 |
greg |
1.1 |
r->crtype = ro->crtype | (r->rtype = rt); |
90 |
|
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VCOPY(r->rorg, ro->rop); |
91 |
gwlarson |
2.31 |
r->rweight = ro->rweight * rw; |
92 |
greg |
2.49 |
/* estimate extinction */ |
93 |
gwlarson |
2.31 |
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
94 |
|
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colval(ro->cext,RED) : colval(ro->cext,GRN); |
95 |
|
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if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
96 |
greg |
2.49 |
re *= ro->rot; |
97 |
schorsch |
2.58 |
if (re > 0.1) { |
98 |
|
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if (re > 92.) { |
99 |
greg |
2.53 |
r->rweight = 0.0; |
100 |
schorsch |
2.58 |
} else { |
101 |
greg |
2.53 |
r->rweight *= exp(-re); |
102 |
schorsch |
2.58 |
} |
103 |
|
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} |
104 |
greg |
1.1 |
} |
105 |
greg |
1.22 |
rayclear(r); |
106 |
greg |
2.53 |
if (r->rweight <= 0.0) /* check for expiration */ |
107 |
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return(-1); |
108 |
greg |
2.52 |
if (r->crtype & SHADOW) /* shadow commitment */ |
109 |
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return(0); |
110 |
greg |
2.67 |
/* ambient in photon map? */ |
111 |
greg |
2.68 |
if (photonMapping && ro != NULL && ro->crtype & AMBIENT) |
112 |
greg |
2.67 |
return(-1); |
113 |
greg |
2.51 |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
114 |
|
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if (minweight <= 0.0) |
115 |
|
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error(USER, "zero ray weight in Russian roulette"); |
116 |
|
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if (maxdepth < 0 && r->rlvl > -maxdepth) |
117 |
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return(-1); /* upper reflection limit */ |
118 |
|
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if (r->rweight >= minweight) |
119 |
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return(0); |
120 |
greg |
2.55 |
if (frandom() > r->rweight/minweight) |
121 |
greg |
2.51 |
return(-1); |
122 |
|
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rw = minweight/r->rweight; /* promote survivor */ |
123 |
|
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scalecolor(r->rcoef, rw); |
124 |
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r->rweight = minweight; |
125 |
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return(0); |
126 |
|
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} |
127 |
greg |
2.64 |
return(r->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1); |
128 |
greg |
1.22 |
} |
129 |
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|
130 |
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|
131 |
greg |
2.65 |
void |
132 |
schorsch |
2.45 |
rayclear( /* clear a ray for (re)evaluation */ |
133 |
greg |
2.64 |
RAY *r |
134 |
schorsch |
2.45 |
) |
135 |
greg |
1.22 |
{ |
136 |
greg |
1.20 |
r->rno = raynum++; |
137 |
greg |
1.1 |
r->newcset = r->clipset; |
138 |
greg |
2.36 |
r->hitf = rayhit; |
139 |
greg |
2.28 |
r->robj = OVOID; |
140 |
greg |
2.17 |
r->ro = NULL; |
141 |
greg |
2.34 |
r->rox = NULL; |
142 |
gregl |
2.29 |
r->rt = r->rot = FHUGE; |
143 |
greg |
1.1 |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
144 |
greg |
2.37 |
r->uv[0] = r->uv[1] = 0.0; |
145 |
greg |
1.1 |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
146 |
|
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setcolor(r->rcol, 0.0, 0.0, 0.0); |
147 |
|
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} |
148 |
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|
149 |
|
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|
150 |
greg |
2.65 |
void |
151 |
greg |
2.50 |
raytrace( /* trace a ray and compute its value */ |
152 |
schorsch |
2.45 |
RAY *r |
153 |
|
|
) |
154 |
greg |
1.1 |
{ |
155 |
greg |
1.15 |
if (localhit(r, &thescene)) |
156 |
greg |
2.24 |
raycont(r); /* hit local surface, evaluate */ |
157 |
greg |
2.16 |
else if (r->ro == &Aftplane) { |
158 |
greg |
2.23 |
r->ro = NULL; /* hit aft clipping plane */ |
159 |
greg |
2.16 |
r->rot = FHUGE; |
160 |
|
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} else if (sourcehit(r)) |
161 |
greg |
2.24 |
rayshade(r, r->ro->omod); /* distant source */ |
162 |
greg |
1.1 |
|
163 |
|
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if (trace != NULL) |
164 |
|
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(*trace)(r); /* trace execution */ |
165 |
greg |
2.49 |
|
166 |
|
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rayparticipate(r); /* for participating medium */ |
167 |
greg |
1.1 |
} |
168 |
|
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|
169 |
|
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|
170 |
greg |
2.65 |
void |
171 |
schorsch |
2.45 |
raycont( /* check for clipped object and continue */ |
172 |
greg |
2.64 |
RAY *r |
173 |
schorsch |
2.45 |
) |
174 |
greg |
1.8 |
{ |
175 |
greg |
2.7 |
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
176 |
greg |
2.24 |
!rayshade(r, r->ro->omod)) |
177 |
greg |
1.8 |
raytrans(r); |
178 |
|
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} |
179 |
|
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|
180 |
|
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|
181 |
greg |
2.65 |
void |
182 |
schorsch |
2.45 |
raytrans( /* transmit ray as is */ |
183 |
greg |
2.64 |
RAY *r |
184 |
schorsch |
2.45 |
) |
185 |
greg |
1.1 |
{ |
186 |
|
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RAY tr; |
187 |
|
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|
188 |
greg |
2.67 |
rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
189 |
|
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VCOPY(tr.rdir, r->rdir); |
190 |
|
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rayvalue(&tr); |
191 |
|
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copycolor(r->rcol, tr.rcol); |
192 |
|
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r->rt = r->rot + tr.rt; |
193 |
greg |
1.1 |
} |
194 |
|
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|
195 |
|
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|
196 |
greg |
2.65 |
int |
197 |
schorsch |
2.45 |
rayshade( /* shade ray r with material mod */ |
198 |
greg |
2.64 |
RAY *r, |
199 |
schorsch |
2.45 |
int mod |
200 |
|
|
) |
201 |
greg |
1.1 |
{ |
202 |
greg |
2.64 |
OBJREC *m; |
203 |
greg |
2.47 |
|
204 |
greg |
1.19 |
r->rt = r->rot; /* set effective ray length */ |
205 |
greg |
2.47 |
for ( ; mod != OVOID; mod = m->omod) { |
206 |
greg |
1.1 |
m = objptr(mod); |
207 |
greg |
1.4 |
/****** unnecessary test since modifier() is always called |
208 |
greg |
1.1 |
if (!ismodifier(m->otype)) { |
209 |
|
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
210 |
|
|
error(USER, errmsg); |
211 |
|
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} |
212 |
greg |
1.4 |
******/ |
213 |
greg |
1.16 |
/* hack for irradiance calculation */ |
214 |
greg |
2.38 |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
215 |
greg |
2.43 |
m->otype != MAT_CLIP && |
216 |
greg |
2.38 |
(ofun[m->otype].flags & (T_M|T_X))) { |
217 |
greg |
1.16 |
if (irr_ignore(m->otype)) { |
218 |
|
|
raytrans(r); |
219 |
greg |
2.15 |
return(1); |
220 |
greg |
1.16 |
} |
221 |
greg |
1.18 |
if (!islight(m->otype)) |
222 |
greg |
1.16 |
m = &Lamb; |
223 |
|
|
} |
224 |
greg |
2.47 |
if ((*ofun[m->otype].funp)(m, r)) |
225 |
|
|
return(1); /* materials call raytexture() */ |
226 |
greg |
1.1 |
} |
227 |
greg |
2.47 |
return(0); /* no material! */ |
228 |
greg |
2.23 |
} |
229 |
|
|
|
230 |
|
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|
231 |
greg |
2.65 |
void |
232 |
schorsch |
2.45 |
rayparticipate( /* compute ray medium participation */ |
233 |
greg |
2.64 |
RAY *r |
234 |
schorsch |
2.45 |
) |
235 |
greg |
2.23 |
{ |
236 |
|
|
COLOR ce, ca; |
237 |
|
|
double re, ge, be; |
238 |
|
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|
239 |
|
|
if (intens(r->cext) <= 1./FHUGE) |
240 |
|
|
return; /* no medium */ |
241 |
greg |
2.27 |
re = r->rot*colval(r->cext,RED); |
242 |
|
|
ge = r->rot*colval(r->cext,GRN); |
243 |
|
|
be = r->rot*colval(r->cext,BLU); |
244 |
greg |
2.26 |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
245 |
|
|
re *= 1. - colval(r->albedo,RED); |
246 |
|
|
ge *= 1. - colval(r->albedo,GRN); |
247 |
|
|
be *= 1. - colval(r->albedo,BLU); |
248 |
|
|
} |
249 |
greg |
2.49 |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
250 |
|
|
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
251 |
|
|
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
252 |
|
|
multcolor(r->rcol, ce); /* path extinction */ |
253 |
greg |
2.26 |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
254 |
greg |
2.23 |
return; /* no scattering */ |
255 |
greg |
2.66 |
|
256 |
|
|
/* PMAP: indirect inscattering accounted for by volume photons? */ |
257 |
|
|
if (!volumePhotonMapping) { |
258 |
|
|
setcolor(ca, |
259 |
|
|
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
260 |
|
|
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
261 |
|
|
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
262 |
|
|
addcolor(r->rcol, ca); /* ambient in scattering */ |
263 |
|
|
} |
264 |
|
|
|
265 |
greg |
2.23 |
srcscatter(r); /* source in scattering */ |
266 |
greg |
1.1 |
} |
267 |
|
|
|
268 |
|
|
|
269 |
greg |
2.65 |
void |
270 |
schorsch |
2.45 |
raytexture( /* get material modifiers */ |
271 |
|
|
RAY *r, |
272 |
|
|
OBJECT mod |
273 |
|
|
) |
274 |
greg |
1.1 |
{ |
275 |
greg |
2.64 |
OBJREC *m; |
276 |
greg |
1.1 |
/* execute textures and patterns */ |
277 |
|
|
for ( ; mod != OVOID; mod = m->omod) { |
278 |
|
|
m = objptr(mod); |
279 |
greg |
2.9 |
/****** unnecessary test since modifier() is always called |
280 |
|
|
if (!ismodifier(m->otype)) { |
281 |
greg |
1.1 |
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
282 |
|
|
error(USER, errmsg); |
283 |
|
|
} |
284 |
greg |
2.9 |
******/ |
285 |
greg |
2.20 |
if ((*ofun[m->otype].funp)(m, r)) { |
286 |
|
|
sprintf(errmsg, "conflicting material \"%s\"", |
287 |
|
|
m->oname); |
288 |
|
|
objerror(r->ro, USER, errmsg); |
289 |
|
|
} |
290 |
greg |
1.1 |
} |
291 |
|
|
} |
292 |
|
|
|
293 |
|
|
|
294 |
greg |
2.65 |
int |
295 |
schorsch |
2.45 |
raymixture( /* mix modifiers */ |
296 |
greg |
2.64 |
RAY *r, |
297 |
schorsch |
2.45 |
OBJECT fore, |
298 |
|
|
OBJECT back, |
299 |
|
|
double coef |
300 |
|
|
) |
301 |
greg |
1.1 |
{ |
302 |
greg |
2.9 |
RAY fr, br; |
303 |
|
|
int foremat, backmat; |
304 |
greg |
2.64 |
int i; |
305 |
greg |
2.24 |
/* bound coefficient */ |
306 |
greg |
1.1 |
if (coef > 1.0) |
307 |
|
|
coef = 1.0; |
308 |
|
|
else if (coef < 0.0) |
309 |
|
|
coef = 0.0; |
310 |
greg |
2.13 |
/* compute foreground and background */ |
311 |
greg |
2.24 |
foremat = backmat = 0; |
312 |
greg |
2.9 |
/* foreground */ |
313 |
schorsch |
2.41 |
fr = *r; |
314 |
greg |
2.54 |
if (coef > FTINY) { |
315 |
greg |
2.59 |
fr.rweight *= coef; |
316 |
greg |
2.54 |
scalecolor(fr.rcoef, coef); |
317 |
greg |
2.9 |
foremat = rayshade(&fr, fore); |
318 |
greg |
2.54 |
} |
319 |
greg |
2.9 |
/* background */ |
320 |
schorsch |
2.41 |
br = *r; |
321 |
greg |
2.54 |
if (coef < 1.0-FTINY) { |
322 |
greg |
2.59 |
br.rweight *= 1.0-coef; |
323 |
greg |
2.54 |
scalecolor(br.rcoef, 1.0-coef); |
324 |
greg |
2.9 |
backmat = rayshade(&br, back); |
325 |
greg |
2.54 |
} |
326 |
greg |
2.24 |
/* check for transparency */ |
327 |
schorsch |
2.41 |
if (backmat ^ foremat) { |
328 |
gwlarson |
2.33 |
if (backmat && coef > FTINY) |
329 |
greg |
2.24 |
raytrans(&fr); |
330 |
gwlarson |
2.33 |
else if (foremat && coef < 1.0-FTINY) |
331 |
greg |
2.24 |
raytrans(&br); |
332 |
schorsch |
2.41 |
} |
333 |
greg |
2.12 |
/* mix perturbations */ |
334 |
greg |
1.1 |
for (i = 0; i < 3; i++) |
335 |
greg |
2.12 |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
336 |
|
|
/* mix pattern colors */ |
337 |
greg |
2.9 |
scalecolor(fr.pcol, coef); |
338 |
|
|
scalecolor(br.pcol, 1.0-coef); |
339 |
greg |
2.12 |
copycolor(r->pcol, fr.pcol); |
340 |
|
|
addcolor(r->pcol, br.pcol); |
341 |
greg |
2.24 |
/* return value tells if material */ |
342 |
|
|
if (!foremat & !backmat) |
343 |
|
|
return(0); |
344 |
greg |
2.12 |
/* mix returned ray values */ |
345 |
greg |
2.24 |
scalecolor(fr.rcol, coef); |
346 |
|
|
scalecolor(br.rcol, 1.0-coef); |
347 |
|
|
copycolor(r->rcol, fr.rcol); |
348 |
|
|
addcolor(r->rcol, br.rcol); |
349 |
|
|
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
350 |
|
|
return(1); |
351 |
greg |
1.1 |
} |
352 |
|
|
|
353 |
|
|
|
354 |
greg |
2.65 |
double |
355 |
schorsch |
2.45 |
raydist( /* compute (cumulative) ray distance */ |
356 |
greg |
2.64 |
const RAY *r, |
357 |
|
|
int flags |
358 |
schorsch |
2.45 |
) |
359 |
greg |
2.21 |
{ |
360 |
|
|
double sum = 0.0; |
361 |
|
|
|
362 |
|
|
while (r != NULL && r->crtype&flags) { |
363 |
|
|
sum += r->rot; |
364 |
|
|
r = r->parent; |
365 |
|
|
} |
366 |
|
|
return(sum); |
367 |
|
|
} |
368 |
|
|
|
369 |
|
|
|
370 |
greg |
2.65 |
void |
371 |
greg |
2.49 |
raycontrib( /* compute (cumulative) ray contribution */ |
372 |
greg |
2.63 |
RREAL rc[3], |
373 |
greg |
2.49 |
const RAY *r, |
374 |
|
|
int flags |
375 |
|
|
) |
376 |
|
|
{ |
377 |
greg |
2.52 |
double eext[3]; |
378 |
|
|
int i; |
379 |
|
|
|
380 |
|
|
eext[0] = eext[1] = eext[2] = 0.; |
381 |
|
|
rc[0] = rc[1] = rc[2] = 1.; |
382 |
greg |
2.49 |
|
383 |
|
|
while (r != NULL && r->crtype&flags) { |
384 |
greg |
2.52 |
for (i = 3; i--; ) { |
385 |
|
|
rc[i] *= colval(r->rcoef,i); |
386 |
|
|
eext[i] += r->rot * colval(r->cext,i); |
387 |
|
|
} |
388 |
greg |
2.49 |
r = r->parent; |
389 |
|
|
} |
390 |
greg |
2.52 |
for (i = 3; i--; ) |
391 |
|
|
rc[i] *= (eext[i] <= FTINY) ? 1. : |
392 |
greg |
2.53 |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
393 |
greg |
2.49 |
} |
394 |
|
|
|
395 |
|
|
|
396 |
greg |
2.65 |
double |
397 |
schorsch |
2.45 |
raynormal( /* compute perturbed normal for ray */ |
398 |
|
|
FVECT norm, |
399 |
greg |
2.64 |
RAY *r |
400 |
schorsch |
2.45 |
) |
401 |
greg |
1.1 |
{ |
402 |
|
|
double newdot; |
403 |
greg |
2.64 |
int i; |
404 |
greg |
1.1 |
|
405 |
|
|
/* The perturbation is added to the surface normal to obtain |
406 |
|
|
* the new normal. If the new normal would affect the surface |
407 |
|
|
* orientation wrt. the ray, a correction is made. The method is |
408 |
|
|
* still fraught with problems since reflected rays and similar |
409 |
|
|
* directions calculated from the surface normal may spawn rays behind |
410 |
|
|
* the surface. The only solution is to curb textures at high |
411 |
greg |
1.9 |
* incidence (namely, keep DOT(rdir,pert) < Rdot). |
412 |
greg |
1.1 |
*/ |
413 |
|
|
|
414 |
|
|
for (i = 0; i < 3; i++) |
415 |
|
|
norm[i] = r->ron[i] + r->pert[i]; |
416 |
|
|
|
417 |
|
|
if (normalize(norm) == 0.0) { |
418 |
|
|
objerror(r->ro, WARNING, "illegal normal perturbation"); |
419 |
|
|
VCOPY(norm, r->ron); |
420 |
|
|
return(r->rod); |
421 |
|
|
} |
422 |
|
|
newdot = -DOT(norm, r->rdir); |
423 |
|
|
if ((newdot > 0.0) != (r->rod > 0.0)) { /* fix orientation */ |
424 |
|
|
for (i = 0; i < 3; i++) |
425 |
|
|
norm[i] += 2.0*newdot*r->rdir[i]; |
426 |
|
|
newdot = -newdot; |
427 |
|
|
} |
428 |
|
|
return(newdot); |
429 |
greg |
1.12 |
} |
430 |
|
|
|
431 |
|
|
|
432 |
greg |
2.65 |
void |
433 |
schorsch |
2.45 |
newrayxf( /* get new tranformation matrix for ray */ |
434 |
|
|
RAY *r |
435 |
|
|
) |
436 |
greg |
1.12 |
{ |
437 |
|
|
static struct xfn { |
438 |
|
|
struct xfn *next; |
439 |
|
|
FULLXF xf; |
440 |
|
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
441 |
greg |
2.64 |
struct xfn *xp; |
442 |
|
|
const RAY *rp; |
443 |
greg |
1.12 |
|
444 |
|
|
/* |
445 |
|
|
* Search for transform in circular list that |
446 |
|
|
* has no associated ray in the tree. |
447 |
|
|
*/ |
448 |
|
|
xp = xflast; |
449 |
|
|
for (rp = r->parent; rp != NULL; rp = rp->parent) |
450 |
|
|
if (rp->rox == &xp->xf) { /* xp in use */ |
451 |
|
|
xp = xp->next; /* move to next */ |
452 |
|
|
if (xp == xflast) { /* need new one */ |
453 |
greg |
2.64 |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
454 |
greg |
1.12 |
if (xp == NULL) |
455 |
|
|
error(SYSTEM, |
456 |
|
|
"out of memory in newrayxf"); |
457 |
|
|
/* insert in list */ |
458 |
|
|
xp->next = xflast->next; |
459 |
|
|
xflast->next = xp; |
460 |
|
|
break; /* we're done */ |
461 |
|
|
} |
462 |
|
|
rp = r; /* start check over */ |
463 |
|
|
} |
464 |
|
|
/* got it */ |
465 |
|
|
r->rox = &xp->xf; |
466 |
|
|
xflast = xp; |
467 |
greg |
1.1 |
} |
468 |
|
|
|
469 |
|
|
|
470 |
greg |
2.65 |
void |
471 |
schorsch |
2.45 |
flipsurface( /* reverse surface orientation */ |
472 |
greg |
2.64 |
RAY *r |
473 |
schorsch |
2.45 |
) |
474 |
greg |
1.1 |
{ |
475 |
|
|
r->rod = -r->rod; |
476 |
|
|
r->ron[0] = -r->ron[0]; |
477 |
|
|
r->ron[1] = -r->ron[1]; |
478 |
|
|
r->ron[2] = -r->ron[2]; |
479 |
|
|
r->pert[0] = -r->pert[0]; |
480 |
|
|
r->pert[1] = -r->pert[1]; |
481 |
|
|
r->pert[2] = -r->pert[2]; |
482 |
|
|
} |
483 |
|
|
|
484 |
|
|
|
485 |
greg |
2.65 |
void |
486 |
schorsch |
2.45 |
rayhit( /* standard ray hit test */ |
487 |
|
|
OBJECT *oset, |
488 |
|
|
RAY *r |
489 |
|
|
) |
490 |
greg |
2.36 |
{ |
491 |
|
|
OBJREC *o; |
492 |
|
|
int i; |
493 |
|
|
|
494 |
|
|
for (i = oset[0]; i > 0; i--) { |
495 |
|
|
o = objptr(oset[i]); |
496 |
|
|
if ((*ofun[o->otype].funp)(o, r)) |
497 |
|
|
r->robj = oset[i]; |
498 |
|
|
} |
499 |
|
|
} |
500 |
|
|
|
501 |
|
|
|
502 |
greg |
2.65 |
int |
503 |
schorsch |
2.45 |
localhit( /* check for hit in the octree */ |
504 |
greg |
2.64 |
RAY *r, |
505 |
|
|
CUBE *scene |
506 |
schorsch |
2.45 |
) |
507 |
greg |
1.1 |
{ |
508 |
greg |
2.3 |
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
509 |
greg |
1.1 |
FVECT curpos; /* current cube position */ |
510 |
greg |
1.11 |
int sflags; /* sign flags */ |
511 |
greg |
1.1 |
double t, dt; |
512 |
greg |
2.64 |
int i; |
513 |
greg |
1.1 |
|
514 |
greg |
1.21 |
nrays++; /* increment trace counter */ |
515 |
greg |
1.11 |
sflags = 0; |
516 |
greg |
1.1 |
for (i = 0; i < 3; i++) { |
517 |
|
|
curpos[i] = r->rorg[i]; |
518 |
greg |
2.8 |
if (r->rdir[i] > 1e-7) |
519 |
greg |
1.11 |
sflags |= 1 << i; |
520 |
greg |
2.8 |
else if (r->rdir[i] < -1e-7) |
521 |
greg |
1.11 |
sflags |= 0x10 << i; |
522 |
greg |
1.1 |
} |
523 |
greg |
2.61 |
if (!sflags) { |
524 |
|
|
error(WARNING, "zero ray direction in localhit"); |
525 |
|
|
return(0); |
526 |
|
|
} |
527 |
greg |
2.17 |
/* start off assuming nothing hit */ |
528 |
|
|
if (r->rmax > FTINY) { /* except aft plane if one */ |
529 |
|
|
r->ro = &Aftplane; |
530 |
|
|
r->rot = r->rmax; |
531 |
greg |
2.62 |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
532 |
greg |
2.17 |
} |
533 |
|
|
/* find global cube entrance point */ |
534 |
greg |
1.1 |
t = 0.0; |
535 |
|
|
if (!incube(scene, curpos)) { |
536 |
|
|
/* find distance to entry */ |
537 |
|
|
for (i = 0; i < 3; i++) { |
538 |
|
|
/* plane in our direction */ |
539 |
greg |
1.11 |
if (sflags & 1<<i) |
540 |
greg |
1.1 |
dt = scene->cuorg[i]; |
541 |
greg |
1.11 |
else if (sflags & 0x10<<i) |
542 |
greg |
1.1 |
dt = scene->cuorg[i] + scene->cusize; |
543 |
|
|
else |
544 |
|
|
continue; |
545 |
|
|
/* distance to the plane */ |
546 |
|
|
dt = (dt - r->rorg[i])/r->rdir[i]; |
547 |
|
|
if (dt > t) |
548 |
|
|
t = dt; /* farthest face is the one */ |
549 |
|
|
} |
550 |
|
|
t += FTINY; /* fudge to get inside cube */ |
551 |
greg |
2.17 |
if (t >= r->rot) /* clipped already */ |
552 |
|
|
return(0); |
553 |
greg |
1.1 |
/* advance position */ |
554 |
greg |
2.62 |
VSUM(curpos, curpos, r->rdir, t); |
555 |
greg |
1.1 |
|
556 |
|
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
557 |
|
|
return(0); |
558 |
|
|
} |
559 |
greg |
2.3 |
cxset[0] = 0; |
560 |
greg |
2.19 |
raymove(curpos, cxset, sflags, r, scene); |
561 |
schorsch |
2.42 |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
562 |
greg |
1.1 |
} |
563 |
|
|
|
564 |
|
|
|
565 |
|
|
static int |
566 |
schorsch |
2.45 |
raymove( /* check for hit as we move */ |
567 |
|
|
FVECT pos, /* current position, modified herein */ |
568 |
|
|
OBJECT *cxs, /* checked objects, modified by checkhit */ |
569 |
|
|
int dirf, /* direction indicators to speed tests */ |
570 |
greg |
2.64 |
RAY *r, |
571 |
|
|
CUBE *cu |
572 |
schorsch |
2.45 |
) |
573 |
greg |
1.1 |
{ |
574 |
|
|
int ax; |
575 |
|
|
double dt, t; |
576 |
|
|
|
577 |
|
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
578 |
|
|
CUBE cukid; |
579 |
greg |
2.64 |
int br, sgn; |
580 |
greg |
1.1 |
|
581 |
|
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
582 |
|
|
VCOPY(cukid.cuorg, cu->cuorg); |
583 |
|
|
br = 0; |
584 |
|
|
if (pos[0] >= cukid.cuorg[0]+cukid.cusize) { |
585 |
|
|
cukid.cuorg[0] += cukid.cusize; |
586 |
|
|
br |= 1; |
587 |
|
|
} |
588 |
|
|
if (pos[1] >= cukid.cuorg[1]+cukid.cusize) { |
589 |
|
|
cukid.cuorg[1] += cukid.cusize; |
590 |
|
|
br |= 2; |
591 |
|
|
} |
592 |
|
|
if (pos[2] >= cukid.cuorg[2]+cukid.cusize) { |
593 |
|
|
cukid.cuorg[2] += cukid.cusize; |
594 |
|
|
br |= 4; |
595 |
|
|
} |
596 |
|
|
for ( ; ; ) { |
597 |
|
|
cukid.cutree = octkid(cu->cutree, br); |
598 |
greg |
2.3 |
if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
599 |
greg |
1.1 |
return(RAYHIT); |
600 |
|
|
sgn = 1 << ax; |
601 |
greg |
1.11 |
if (sgn & dirf) /* positive axis? */ |
602 |
greg |
1.1 |
if (sgn & br) |
603 |
|
|
return(ax); /* overflow */ |
604 |
|
|
else { |
605 |
|
|
cukid.cuorg[ax] += cukid.cusize; |
606 |
|
|
br |= sgn; |
607 |
|
|
} |
608 |
greg |
1.11 |
else |
609 |
|
|
if (sgn & br) { |
610 |
|
|
cukid.cuorg[ax] -= cukid.cusize; |
611 |
|
|
br &= ~sgn; |
612 |
|
|
} else |
613 |
|
|
return(ax); /* underflow */ |
614 |
greg |
1.1 |
} |
615 |
|
|
/*NOTREACHED*/ |
616 |
|
|
} |
617 |
greg |
2.18 |
if (isfull(cu->cutree)) { |
618 |
|
|
if (checkhit(r, cu, cxs)) |
619 |
|
|
return(RAYHIT); |
620 |
|
|
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
621 |
greg |
1.1 |
return(RAYHIT); |
622 |
|
|
/* advance to next cube */ |
623 |
greg |
1.11 |
if (dirf&0x11) { |
624 |
|
|
dt = dirf&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
625 |
greg |
1.1 |
t = (dt - pos[0])/r->rdir[0]; |
626 |
|
|
ax = 0; |
627 |
|
|
} else |
628 |
|
|
t = FHUGE; |
629 |
greg |
1.11 |
if (dirf&0x22) { |
630 |
|
|
dt = dirf&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
631 |
greg |
1.1 |
dt = (dt - pos[1])/r->rdir[1]; |
632 |
|
|
if (dt < t) { |
633 |
|
|
t = dt; |
634 |
|
|
ax = 1; |
635 |
|
|
} |
636 |
|
|
} |
637 |
greg |
1.11 |
if (dirf&0x44) { |
638 |
|
|
dt = dirf&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
639 |
greg |
1.1 |
dt = (dt - pos[2])/r->rdir[2]; |
640 |
|
|
if (dt < t) { |
641 |
|
|
t = dt; |
642 |
|
|
ax = 2; |
643 |
|
|
} |
644 |
|
|
} |
645 |
greg |
2.62 |
VSUM(pos, pos, r->rdir, t); |
646 |
greg |
1.1 |
return(ax); |
647 |
|
|
} |
648 |
|
|
|
649 |
|
|
|
650 |
greg |
2.34 |
static int |
651 |
schorsch |
2.45 |
checkhit( /* check for hit in full cube */ |
652 |
greg |
2.64 |
RAY *r, |
653 |
schorsch |
2.45 |
CUBE *cu, |
654 |
|
|
OBJECT *cxs |
655 |
|
|
) |
656 |
greg |
1.1 |
{ |
657 |
|
|
OBJECT oset[MAXSET+1]; |
658 |
|
|
|
659 |
|
|
objset(oset, cu->cutree); |
660 |
greg |
2.36 |
checkset(oset, cxs); /* avoid double-checking */ |
661 |
|
|
|
662 |
|
|
(*r->hitf)(oset, r); /* test for hit in set */ |
663 |
|
|
|
664 |
|
|
if (r->robj == OVOID) |
665 |
greg |
1.1 |
return(0); /* no scores yet */ |
666 |
|
|
|
667 |
|
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
668 |
greg |
2.2 |
} |
669 |
|
|
|
670 |
|
|
|
671 |
greg |
2.34 |
static void |
672 |
schorsch |
2.45 |
checkset( /* modify checked set and set to check */ |
673 |
greg |
2.64 |
OBJECT *os, /* os' = os - cs */ |
674 |
|
|
OBJECT *cs /* cs' = cs + os */ |
675 |
schorsch |
2.45 |
) |
676 |
greg |
2.2 |
{ |
677 |
|
|
OBJECT cset[MAXCSET+MAXSET+1]; |
678 |
greg |
2.64 |
int i, j; |
679 |
greg |
2.3 |
int k; |
680 |
greg |
2.2 |
/* copy os in place, cset <- cs */ |
681 |
|
|
cset[0] = 0; |
682 |
|
|
k = 0; |
683 |
|
|
for (i = j = 1; i <= os[0]; i++) { |
684 |
|
|
while (j <= cs[0] && cs[j] < os[i]) |
685 |
|
|
cset[++cset[0]] = cs[j++]; |
686 |
|
|
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
687 |
|
|
os[++k] = os[i]; |
688 |
|
|
cset[++cset[0]] = os[i]; |
689 |
|
|
} |
690 |
|
|
} |
691 |
greg |
2.3 |
if (!(os[0] = k)) /* new "to check" set size */ |
692 |
|
|
return; /* special case */ |
693 |
greg |
2.2 |
while (j <= cs[0]) /* get the rest of cs */ |
694 |
|
|
cset[++cset[0]] = cs[j++]; |
695 |
greg |
2.3 |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
696 |
greg |
2.2 |
cset[0] = MAXCSET; |
697 |
greg |
2.3 |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
698 |
|
|
os = cset; |
699 |
|
|
for (i = os[0]; i-- >= 0; ) |
700 |
|
|
*cs++ = *os++; |
701 |
greg |
1.1 |
} |