| 1 |
– |
/* Copyright (c) 1994 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 |
|
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
| 20 |
|
|
| 21 |
< |
extern CUBE thescene; /* our scene */ |
| 22 |
< |
extern int maxdepth; /* maximum recursion depth */ |
| 25 |
< |
extern double minweight; /* minimum ray weight */ |
| 26 |
< |
extern int do_irrad; /* compute irradiance? */ |
| 21 |
> |
RNUMBER raynum = 0; /* next unique ray number */ |
| 22 |
> |
RNUMBER nrays = 0; /* number of calls to localhit */ |
| 23 |
|
|
| 24 |
< |
unsigned long raynum = 0; /* next unique ray number */ |
| 29 |
< |
unsigned long nrays = 0; /* number of calls to localhit */ |
| 30 |
< |
|
| 31 |
< |
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, |
| 27 |
> |
{NULL, Lambfa, 0, 5}, NULL |
| 28 |
|
}; /* a Lambertian surface */ |
| 29 |
|
|
| 30 |
< |
static int raymove(), checkset(), checkhit(); |
| 30 |
> |
OBJREC Aftplane; /* aft clipping plane object */ |
| 31 |
|
|
| 39 |
– |
#define MAXLOOP 128 /* modifier loop detection */ |
| 40 |
– |
|
| 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 (rc != r->rcoef) |
| 55 |
+ |
copycolor(r->rcoef, rc); |
| 56 |
+ |
} |
| 57 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
| 58 |
|
r->rlvl = 0; |
| 59 |
|
r->rweight = rw; |
| 61 |
|
r->rsrc = -1; |
| 62 |
|
r->clipset = NULL; |
| 63 |
|
r->revf = raytrace; |
| 64 |
+ |
copycolor(r->cext, cextinction); |
| 65 |
+ |
copycolor(r->albedo, salbedo); |
| 66 |
+ |
r->gecc = seccg; |
| 67 |
+ |
r->slights = NULL; |
| 68 |
|
} else { /* spawned ray */ |
| 69 |
+ |
if (ro->rot >= FHUGE) { |
| 70 |
+ |
memset(r, 0, sizeof(RAY)); |
| 71 |
+ |
return(-1); /* illegal continuation */ |
| 72 |
+ |
} |
| 73 |
|
r->rlvl = ro->rlvl; |
| 74 |
|
if (rt & RAYREFL) { |
| 75 |
|
r->rlvl++; |
| 76 |
|
r->rsrc = -1; |
| 77 |
|
r->clipset = ro->clipset; |
| 78 |
+ |
r->rmax = 0.0; |
| 79 |
|
} else { |
| 80 |
|
r->rsrc = ro->rsrc; |
| 81 |
|
r->clipset = ro->newcset; |
| 82 |
+ |
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
| 83 |
|
} |
| 84 |
|
r->revf = ro->revf; |
| 85 |
< |
r->rweight = ro->rweight * rw; |
| 85 |
> |
copycolor(r->cext, ro->cext); |
| 86 |
> |
copycolor(r->albedo, ro->albedo); |
| 87 |
> |
r->gecc = ro->gecc; |
| 88 |
> |
r->slights = ro->slights; |
| 89 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
| 90 |
|
VCOPY(r->rorg, ro->rop); |
| 91 |
+ |
r->rweight = ro->rweight * rw; |
| 92 |
+ |
/* estimate extinction */ |
| 93 |
+ |
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
| 94 |
+ |
colval(ro->cext,RED) : colval(ro->cext,GRN); |
| 95 |
+ |
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
| 96 |
+ |
re *= ro->rot; |
| 97 |
+ |
if (re > 0.1) { |
| 98 |
+ |
if (re > 92.) { |
| 99 |
+ |
r->rweight = 0.0; |
| 100 |
+ |
} else { |
| 101 |
+ |
r->rweight *= exp(-re); |
| 102 |
+ |
} |
| 103 |
+ |
} |
| 104 |
|
} |
| 105 |
|
rayclear(r); |
| 106 |
< |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
| 106 |
> |
if (r->rweight <= 0.0) /* check for expiration */ |
| 107 |
> |
return(-1); |
| 108 |
> |
if (r->crtype & SHADOW) /* shadow commitment */ |
| 109 |
> |
return(0); |
| 110 |
> |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
| 111 |
> |
if (minweight <= 0.0) |
| 112 |
> |
error(USER, "zero ray weight in Russian roulette"); |
| 113 |
> |
if (maxdepth < 0 && r->rlvl > -maxdepth) |
| 114 |
> |
return(-1); /* upper reflection limit */ |
| 115 |
> |
if (r->rweight >= minweight) |
| 116 |
> |
return(0); |
| 117 |
> |
if (frandom() > r->rweight/minweight) |
| 118 |
> |
return(-1); |
| 119 |
> |
rw = minweight/r->rweight; /* promote survivor */ |
| 120 |
> |
scalecolor(r->rcoef, rw); |
| 121 |
> |
r->rweight = minweight; |
| 122 |
> |
return(0); |
| 123 |
> |
} |
| 124 |
> |
return(r->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1); |
| 125 |
|
} |
| 126 |
|
|
| 127 |
|
|
| 128 |
< |
rayclear(r) /* clear a ray for (re)evaluation */ |
| 129 |
< |
register RAY *r; |
| 128 |
> |
void |
| 129 |
> |
rayclear( /* clear a ray for (re)evaluation */ |
| 130 |
> |
RAY *r |
| 131 |
> |
) |
| 132 |
|
{ |
| 133 |
|
r->rno = raynum++; |
| 134 |
|
r->newcset = r->clipset; |
| 135 |
+ |
r->hitf = rayhit; |
| 136 |
+ |
r->robj = OVOID; |
| 137 |
|
r->ro = NULL; |
| 138 |
< |
r->rot = FHUGE; |
| 138 |
> |
r->rox = NULL; |
| 139 |
> |
r->rt = r->rot = FHUGE; |
| 140 |
|
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 141 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
| 142 |
|
setcolor(r->pcol, 1.0, 1.0, 1.0); |
| 143 |
|
setcolor(r->rcol, 0.0, 0.0, 0.0); |
| 86 |
– |
r->rt = 0.0; |
| 144 |
|
} |
| 145 |
|
|
| 146 |
|
|
| 147 |
< |
raytrace(r) /* trace a ray and compute its value */ |
| 148 |
< |
RAY *r; |
| 147 |
> |
void |
| 148 |
> |
raytrace( /* trace a ray and compute its value */ |
| 149 |
> |
RAY *r |
| 150 |
> |
) |
| 151 |
|
{ |
| 93 |
– |
extern int (*trace)(); |
| 94 |
– |
int gotmat; |
| 95 |
– |
|
| 152 |
|
if (localhit(r, &thescene)) |
| 153 |
< |
gotmat = raycont(r); |
| 154 |
< |
else if (sourcehit(r)) |
| 155 |
< |
gotmat = rayshade(r, r->ro->omod); |
| 153 |
> |
raycont(r); /* hit local surface, evaluate */ |
| 154 |
> |
else if (r->ro == &Aftplane) { |
| 155 |
> |
r->ro = NULL; /* hit aft clipping plane */ |
| 156 |
> |
r->rot = FHUGE; |
| 157 |
> |
} else if (sourcehit(r)) |
| 158 |
> |
rayshade(r, r->ro->omod); /* distant source */ |
| 159 |
|
|
| 101 |
– |
if (!gotmat) |
| 102 |
– |
objerror(r->ro, USER, "material not found"); |
| 103 |
– |
|
| 160 |
|
if (trace != NULL) |
| 161 |
|
(*trace)(r); /* trace execution */ |
| 162 |
+ |
|
| 163 |
+ |
rayparticipate(r); /* for participating medium */ |
| 164 |
|
} |
| 165 |
|
|
| 166 |
|
|
| 167 |
< |
raycont(r) /* check for clipped object and continue */ |
| 168 |
< |
register RAY *r; |
| 167 |
> |
void |
| 168 |
> |
raycont( /* check for clipped object and continue */ |
| 169 |
> |
RAY *r |
| 170 |
> |
) |
| 171 |
|
{ |
| 172 |
|
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
| 173 |
< |
r->ro->omod == OVOID) { |
| 173 |
> |
!rayshade(r, r->ro->omod)) |
| 174 |
|
raytrans(r); |
| 115 |
– |
return(1); |
| 116 |
– |
} |
| 117 |
– |
return(rayshade(r, r->ro->omod)); |
| 175 |
|
} |
| 176 |
|
|
| 177 |
|
|
| 178 |
< |
raytrans(r) /* transmit ray as is */ |
| 179 |
< |
register RAY *r; |
| 178 |
> |
void |
| 179 |
> |
raytrans( /* transmit ray as is */ |
| 180 |
> |
RAY *r |
| 181 |
> |
) |
| 182 |
|
{ |
| 183 |
|
RAY tr; |
| 184 |
|
|
| 185 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
| 185 |
> |
if (rayorigin(&tr, TRANS, r, NULL) == 0) { |
| 186 |
|
VCOPY(tr.rdir, r->rdir); |
| 187 |
|
rayvalue(&tr); |
| 188 |
|
copycolor(r->rcol, tr.rcol); |
| 191 |
|
} |
| 192 |
|
|
| 193 |
|
|
| 194 |
< |
rayshade(r, mod) /* shade ray r with material mod */ |
| 195 |
< |
register RAY *r; |
| 196 |
< |
int mod; |
| 194 |
> |
int |
| 195 |
> |
rayshade( /* shade ray r with material mod */ |
| 196 |
> |
RAY *r, |
| 197 |
> |
int mod |
| 198 |
> |
) |
| 199 |
|
{ |
| 200 |
< |
static int depth = 0; |
| 201 |
< |
int gotmat; |
| 141 |
< |
register OBJREC *m; |
| 142 |
< |
/* check for infinite loop */ |
| 143 |
< |
if (depth++ >= MAXLOOP) |
| 144 |
< |
objerror(r->ro, USER, "possible modifier loop"); |
| 200 |
> |
OBJREC *m; |
| 201 |
> |
|
| 202 |
|
r->rt = r->rot; /* set effective ray length */ |
| 203 |
< |
for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
| 203 |
> |
for ( ; mod != OVOID; mod = m->omod) { |
| 204 |
|
m = objptr(mod); |
| 205 |
|
/****** unnecessary test since modifier() is always called |
| 206 |
|
if (!ismodifier(m->otype)) { |
| 209 |
|
} |
| 210 |
|
******/ |
| 211 |
|
/* hack for irradiance calculation */ |
| 212 |
< |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
| 212 |
> |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
| 213 |
> |
m->otype != MAT_CLIP && |
| 214 |
> |
(ofun[m->otype].flags & (T_M|T_X))) { |
| 215 |
|
if (irr_ignore(m->otype)) { |
| 157 |
– |
depth--; |
| 216 |
|
raytrans(r); |
| 217 |
< |
return; |
| 217 |
> |
return(1); |
| 218 |
|
} |
| 219 |
|
if (!islight(m->otype)) |
| 220 |
|
m = &Lamb; |
| 221 |
|
} |
| 222 |
< |
/* materials call raytexture */ |
| 223 |
< |
gotmat = (*ofun[m->otype].funp)(m, r); |
| 222 |
> |
if ((*ofun[m->otype].funp)(m, r)) |
| 223 |
> |
return(1); /* materials call raytexture() */ |
| 224 |
|
} |
| 225 |
< |
depth--; |
| 168 |
< |
return(gotmat); |
| 225 |
> |
return(0); /* no material! */ |
| 226 |
|
} |
| 227 |
|
|
| 228 |
|
|
| 229 |
< |
raytexture(r, mod) /* get material modifiers */ |
| 230 |
< |
RAY *r; |
| 231 |
< |
int mod; |
| 229 |
> |
void |
| 230 |
> |
rayparticipate( /* compute ray medium participation */ |
| 231 |
> |
RAY *r |
| 232 |
> |
) |
| 233 |
|
{ |
| 234 |
< |
static int depth = 0; |
| 235 |
< |
register OBJREC *m; |
| 236 |
< |
/* check for infinite loop */ |
| 237 |
< |
if (depth++ >= MAXLOOP) |
| 238 |
< |
objerror(r->ro, USER, "modifier loop"); |
| 234 |
> |
COLOR ce, ca; |
| 235 |
> |
double re, ge, be; |
| 236 |
> |
|
| 237 |
> |
if (intens(r->cext) <= 1./FHUGE) |
| 238 |
> |
return; /* no medium */ |
| 239 |
> |
re = r->rot*colval(r->cext,RED); |
| 240 |
> |
ge = r->rot*colval(r->cext,GRN); |
| 241 |
> |
be = r->rot*colval(r->cext,BLU); |
| 242 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
| 243 |
> |
re *= 1. - colval(r->albedo,RED); |
| 244 |
> |
ge *= 1. - colval(r->albedo,GRN); |
| 245 |
> |
be *= 1. - colval(r->albedo,BLU); |
| 246 |
> |
} |
| 247 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
| 248 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
| 249 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
| 250 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
| 251 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
| 252 |
> |
return; /* no scattering */ |
| 253 |
> |
|
| 254 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
| 255 |
> |
if (!volumePhotonMapping) { |
| 256 |
> |
setcolor(ca, |
| 257 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
| 258 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
| 259 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
| 260 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
| 261 |
> |
} |
| 262 |
> |
|
| 263 |
> |
srcscatter(r); /* source in scattering */ |
| 264 |
> |
} |
| 265 |
> |
|
| 266 |
> |
|
| 267 |
> |
void |
| 268 |
> |
raytexture( /* get material modifiers */ |
| 269 |
> |
RAY *r, |
| 270 |
> |
OBJECT mod |
| 271 |
> |
) |
| 272 |
> |
{ |
| 273 |
> |
OBJREC *m; |
| 274 |
|
/* execute textures and patterns */ |
| 275 |
|
for ( ; mod != OVOID; mod = m->omod) { |
| 276 |
|
m = objptr(mod); |
| 280 |
|
error(USER, errmsg); |
| 281 |
|
} |
| 282 |
|
******/ |
| 283 |
< |
if ((*ofun[m->otype].funp)(m, r)) |
| 284 |
< |
objerror(r->ro, USER, "conflicting materials"); |
| 283 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
| 284 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
| 285 |
> |
m->oname); |
| 286 |
> |
objerror(r->ro, USER, errmsg); |
| 287 |
> |
} |
| 288 |
|
} |
| 193 |
– |
depth--; /* end here */ |
| 289 |
|
} |
| 290 |
|
|
| 291 |
|
|
| 292 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
| 293 |
< |
register RAY *r; |
| 294 |
< |
OBJECT fore, back; |
| 295 |
< |
double coef; |
| 292 |
> |
int |
| 293 |
> |
raymixture( /* mix modifiers */ |
| 294 |
> |
RAY *r, |
| 295 |
> |
OBJECT fore, |
| 296 |
> |
OBJECT back, |
| 297 |
> |
double coef |
| 298 |
> |
) |
| 299 |
|
{ |
| 300 |
|
RAY fr, br; |
| 203 |
– |
COLOR ctmp; |
| 301 |
|
int foremat, backmat; |
| 302 |
< |
register int i; |
| 303 |
< |
/* clip coefficient */ |
| 302 |
> |
int i; |
| 303 |
> |
/* bound coefficient */ |
| 304 |
|
if (coef > 1.0) |
| 305 |
|
coef = 1.0; |
| 306 |
|
else if (coef < 0.0) |
| 307 |
|
coef = 0.0; |
| 308 |
+ |
/* compute foreground and background */ |
| 309 |
+ |
foremat = backmat = 0; |
| 310 |
|
/* foreground */ |
| 311 |
< |
copystruct(&fr, r); |
| 312 |
< |
fr.pert[0] = fr.pert[1] = fr.pert[2] = 0.0; |
| 313 |
< |
setcolor(fr.pcol, 1.0, 1.0, 1.0); |
| 314 |
< |
setcolor(fr.rcol, 0.0, 0.0, 0.0); |
| 216 |
< |
if (fore != OVOID && coef > FTINY) |
| 311 |
> |
fr = *r; |
| 312 |
> |
if (coef > FTINY) { |
| 313 |
> |
fr.rweight *= coef; |
| 314 |
> |
scalecolor(fr.rcoef, coef); |
| 315 |
|
foremat = rayshade(&fr, fore); |
| 316 |
< |
else |
| 219 |
< |
foremat = 0; |
| 316 |
> |
} |
| 317 |
|
/* background */ |
| 318 |
< |
copystruct(&br, r); |
| 319 |
< |
br.pert[0] = br.pert[1] = br.pert[2] = 0.0; |
| 320 |
< |
setcolor(br.pcol, 1.0, 1.0, 1.0); |
| 321 |
< |
setcolor(br.rcol, 0.0, 0.0, 0.0); |
| 225 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
| 318 |
> |
br = *r; |
| 319 |
> |
if (coef < 1.0-FTINY) { |
| 320 |
> |
br.rweight *= 1.0-coef; |
| 321 |
> |
scalecolor(br.rcoef, 1.0-coef); |
| 322 |
|
backmat = rayshade(&br, back); |
| 323 |
< |
else |
| 324 |
< |
backmat = foremat; |
| 325 |
< |
/* check */ |
| 326 |
< |
if (backmat != foremat) |
| 327 |
< |
objerror(r->ro, USER, "mixing material with non-material"); |
| 328 |
< |
/* sum perturbations */ |
| 323 |
> |
} |
| 324 |
> |
/* check for transparency */ |
| 325 |
> |
if (backmat ^ foremat) { |
| 326 |
> |
if (backmat && coef > FTINY) |
| 327 |
> |
raytrans(&fr); |
| 328 |
> |
else if (foremat && coef < 1.0-FTINY) |
| 329 |
> |
raytrans(&br); |
| 330 |
> |
} |
| 331 |
> |
/* mix perturbations */ |
| 332 |
|
for (i = 0; i < 3; i++) |
| 333 |
< |
r->pert[i] += coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
| 334 |
< |
/* multiply pattern colors */ |
| 333 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
| 334 |
> |
/* mix pattern colors */ |
| 335 |
|
scalecolor(fr.pcol, coef); |
| 336 |
|
scalecolor(br.pcol, 1.0-coef); |
| 337 |
< |
copycolor(ctmp, fr.pcol); |
| 338 |
< |
addcolor(ctmp, br.pcol); |
| 339 |
< |
multcolor(r->pcol, ctmp); |
| 340 |
< |
/* sum returned ray values */ |
| 337 |
> |
copycolor(r->pcol, fr.pcol); |
| 338 |
> |
addcolor(r->pcol, br.pcol); |
| 339 |
> |
/* return value tells if material */ |
| 340 |
> |
if (!foremat & !backmat) |
| 341 |
> |
return(0); |
| 342 |
> |
/* mix returned ray values */ |
| 343 |
|
scalecolor(fr.rcol, coef); |
| 344 |
|
scalecolor(br.rcol, 1.0-coef); |
| 345 |
< |
addcolor(r->rcol, fr.rcol); |
| 345 |
> |
copycolor(r->rcol, fr.rcol); |
| 346 |
|
addcolor(r->rcol, br.rcol); |
| 347 |
< |
if (foremat) |
| 348 |
< |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
| 248 |
< |
/* return value tells if material */ |
| 249 |
< |
return(foremat); |
| 347 |
> |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
| 348 |
> |
return(1); |
| 349 |
|
} |
| 350 |
|
|
| 351 |
|
|
| 352 |
|
double |
| 353 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
| 354 |
< |
FVECT norm; |
| 355 |
< |
register RAY *r; |
| 353 |
> |
raydist( /* compute (cumulative) ray distance */ |
| 354 |
> |
const RAY *r, |
| 355 |
> |
int flags |
| 356 |
> |
) |
| 357 |
|
{ |
| 358 |
+ |
double sum = 0.0; |
| 359 |
+ |
|
| 360 |
+ |
while (r != NULL && r->crtype&flags) { |
| 361 |
+ |
sum += r->rot; |
| 362 |
+ |
r = r->parent; |
| 363 |
+ |
} |
| 364 |
+ |
return(sum); |
| 365 |
+ |
} |
| 366 |
+ |
|
| 367 |
+ |
|
| 368 |
+ |
void |
| 369 |
+ |
raycontrib( /* compute (cumulative) ray contribution */ |
| 370 |
+ |
RREAL rc[3], |
| 371 |
+ |
const RAY *r, |
| 372 |
+ |
int flags |
| 373 |
+ |
) |
| 374 |
+ |
{ |
| 375 |
+ |
double eext[3]; |
| 376 |
+ |
int i; |
| 377 |
+ |
|
| 378 |
+ |
eext[0] = eext[1] = eext[2] = 0.; |
| 379 |
+ |
rc[0] = rc[1] = rc[2] = 1.; |
| 380 |
+ |
|
| 381 |
+ |
while (r != NULL && r->crtype&flags) { |
| 382 |
+ |
for (i = 3; i--; ) { |
| 383 |
+ |
rc[i] *= colval(r->rcoef,i); |
| 384 |
+ |
eext[i] += r->rot * colval(r->cext,i); |
| 385 |
+ |
} |
| 386 |
+ |
r = r->parent; |
| 387 |
+ |
} |
| 388 |
+ |
for (i = 3; i--; ) |
| 389 |
+ |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
| 390 |
+ |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
| 391 |
+ |
} |
| 392 |
+ |
|
| 393 |
+ |
|
| 394 |
+ |
double |
| 395 |
+ |
raynormal( /* compute perturbed normal for ray */ |
| 396 |
+ |
FVECT norm, |
| 397 |
+ |
RAY *r |
| 398 |
+ |
) |
| 399 |
+ |
{ |
| 400 |
|
double newdot; |
| 401 |
< |
register int i; |
| 401 |
> |
int i; |
| 402 |
|
|
| 403 |
|
/* The perturbation is added to the surface normal to obtain |
| 404 |
|
* the new normal. If the new normal would affect the surface |
| 427 |
|
} |
| 428 |
|
|
| 429 |
|
|
| 430 |
< |
newrayxf(r) /* get new tranformation matrix for ray */ |
| 431 |
< |
RAY *r; |
| 430 |
> |
void |
| 431 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
| 432 |
> |
RAY *r |
| 433 |
> |
) |
| 434 |
|
{ |
| 435 |
|
static struct xfn { |
| 436 |
|
struct xfn *next; |
| 437 |
|
FULLXF xf; |
| 438 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
| 439 |
< |
register struct xfn *xp; |
| 440 |
< |
register RAY *rp; |
| 439 |
> |
struct xfn *xp; |
| 440 |
> |
const RAY *rp; |
| 441 |
|
|
| 442 |
|
/* |
| 443 |
|
* Search for transform in circular list that |
| 465 |
|
} |
| 466 |
|
|
| 467 |
|
|
| 468 |
< |
flipsurface(r) /* reverse surface orientation */ |
| 469 |
< |
register RAY *r; |
| 468 |
> |
void |
| 469 |
> |
flipsurface( /* reverse surface orientation */ |
| 470 |
> |
RAY *r |
| 471 |
> |
) |
| 472 |
|
{ |
| 473 |
|
r->rod = -r->rod; |
| 474 |
|
r->ron[0] = -r->ron[0]; |
| 480 |
|
} |
| 481 |
|
|
| 482 |
|
|
| 483 |
< |
localhit(r, scene) /* check for hit in the octree */ |
| 484 |
< |
register RAY *r; |
| 485 |
< |
register CUBE *scene; |
| 483 |
> |
void |
| 484 |
> |
rayhit( /* standard ray hit test */ |
| 485 |
> |
OBJECT *oset, |
| 486 |
> |
RAY *r |
| 487 |
> |
) |
| 488 |
|
{ |
| 489 |
+ |
OBJREC *o; |
| 490 |
+ |
int i; |
| 491 |
+ |
|
| 492 |
+ |
for (i = oset[0]; i > 0; i--) { |
| 493 |
+ |
o = objptr(oset[i]); |
| 494 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
| 495 |
+ |
r->robj = oset[i]; |
| 496 |
+ |
} |
| 497 |
+ |
} |
| 498 |
+ |
|
| 499 |
+ |
|
| 500 |
+ |
int |
| 501 |
+ |
localhit( /* check for hit in the octree */ |
| 502 |
+ |
RAY *r, |
| 503 |
+ |
CUBE *scene |
| 504 |
+ |
) |
| 505 |
+ |
{ |
| 506 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
| 507 |
|
FVECT curpos; /* current cube position */ |
| 508 |
|
int sflags; /* sign flags */ |
| 509 |
|
double t, dt; |
| 510 |
< |
register int i; |
| 510 |
> |
int i; |
| 511 |
|
|
| 512 |
|
nrays++; /* increment trace counter */ |
| 513 |
|
sflags = 0; |
| 518 |
|
else if (r->rdir[i] < -1e-7) |
| 519 |
|
sflags |= 0x10 << i; |
| 520 |
|
} |
| 521 |
< |
if (sflags == 0) |
| 522 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
| 521 |
> |
if (!sflags) { |
| 522 |
> |
error(WARNING, "zero ray direction in localhit"); |
| 523 |
> |
return(0); |
| 524 |
> |
} |
| 525 |
> |
/* start off assuming nothing hit */ |
| 526 |
> |
if (r->rmax > FTINY) { /* except aft plane if one */ |
| 527 |
> |
r->ro = &Aftplane; |
| 528 |
> |
r->rot = r->rmax; |
| 529 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
| 530 |
> |
} |
| 531 |
> |
/* find global cube entrance point */ |
| 532 |
|
t = 0.0; |
| 533 |
|
if (!incube(scene, curpos)) { |
| 534 |
|
/* find distance to entry */ |
| 546 |
|
t = dt; /* farthest face is the one */ |
| 547 |
|
} |
| 548 |
|
t += FTINY; /* fudge to get inside cube */ |
| 549 |
+ |
if (t >= r->rot) /* clipped already */ |
| 550 |
+ |
return(0); |
| 551 |
|
/* advance position */ |
| 552 |
< |
for (i = 0; i < 3; i++) |
| 377 |
< |
curpos[i] += r->rdir[i]*t; |
| 552 |
> |
VSUM(curpos, curpos, r->rdir, t); |
| 553 |
|
|
| 554 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
| 555 |
|
return(0); |
| 556 |
|
} |
| 557 |
|
cxset[0] = 0; |
| 558 |
< |
return(raymove(curpos, cxset, sflags, r, scene) == RAYHIT); |
| 558 |
> |
raymove(curpos, cxset, sflags, r, scene); |
| 559 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
| 560 |
|
} |
| 561 |
|
|
| 562 |
|
|
| 563 |
|
static int |
| 564 |
< |
raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
| 565 |
< |
FVECT pos; /* current position, modified herein */ |
| 566 |
< |
OBJECT *cxs; /* checked objects, modified by checkhit */ |
| 567 |
< |
int dirf; /* direction indicators to speed tests */ |
| 568 |
< |
register RAY *r; |
| 569 |
< |
register CUBE *cu; |
| 564 |
> |
raymove( /* check for hit as we move */ |
| 565 |
> |
FVECT pos, /* current position, modified herein */ |
| 566 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
| 567 |
> |
int dirf, /* direction indicators to speed tests */ |
| 568 |
> |
RAY *r, |
| 569 |
> |
CUBE *cu |
| 570 |
> |
) |
| 571 |
|
{ |
| 572 |
|
int ax; |
| 573 |
|
double dt, t; |
| 574 |
|
|
| 575 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
| 576 |
|
CUBE cukid; |
| 577 |
< |
register int br, sgn; |
| 577 |
> |
int br, sgn; |
| 578 |
|
|
| 579 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
| 580 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
| 612 |
|
} |
| 613 |
|
/*NOTREACHED*/ |
| 614 |
|
} |
| 615 |
< |
if (isfull(cu->cutree) && checkhit(r, cu, cxs)) |
| 615 |
> |
if (isfull(cu->cutree)) { |
| 616 |
> |
if (checkhit(r, cu, cxs)) |
| 617 |
> |
return(RAYHIT); |
| 618 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
| 619 |
|
return(RAYHIT); |
| 620 |
|
/* advance to next cube */ |
| 621 |
|
if (dirf&0x11) { |
| 640 |
|
ax = 2; |
| 641 |
|
} |
| 642 |
|
} |
| 643 |
< |
pos[0] += r->rdir[0]*t; |
| 464 |
< |
pos[1] += r->rdir[1]*t; |
| 465 |
< |
pos[2] += r->rdir[2]*t; |
| 643 |
> |
VSUM(pos, pos, r->rdir, t); |
| 644 |
|
return(ax); |
| 645 |
|
} |
| 646 |
|
|
| 647 |
|
|
| 648 |
< |
static |
| 649 |
< |
checkhit(r, cu, cxs) /* check for hit in full cube */ |
| 650 |
< |
register RAY *r; |
| 651 |
< |
CUBE *cu; |
| 652 |
< |
OBJECT *cxs; |
| 648 |
> |
static int |
| 649 |
> |
checkhit( /* check for hit in full cube */ |
| 650 |
> |
RAY *r, |
| 651 |
> |
CUBE *cu, |
| 652 |
> |
OBJECT *cxs |
| 653 |
> |
) |
| 654 |
|
{ |
| 655 |
|
OBJECT oset[MAXSET+1]; |
| 477 |
– |
register OBJREC *o; |
| 478 |
– |
register int i; |
| 656 |
|
|
| 657 |
|
objset(oset, cu->cutree); |
| 658 |
< |
checkset(oset, cxs); /* eliminate double-checking */ |
| 659 |
< |
for (i = oset[0]; i > 0; i--) { |
| 660 |
< |
o = objptr(oset[i]); |
| 661 |
< |
(*ofun[o->otype].funp)(o, r); |
| 662 |
< |
} |
| 486 |
< |
if (r->ro == NULL) |
| 658 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
| 659 |
> |
|
| 660 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
| 661 |
> |
|
| 662 |
> |
if (r->robj == OVOID) |
| 663 |
|
return(0); /* no scores yet */ |
| 664 |
|
|
| 665 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
| 666 |
|
} |
| 667 |
|
|
| 668 |
|
|
| 669 |
< |
static |
| 670 |
< |
checkset(os, cs) /* modify checked set and set to check */ |
| 671 |
< |
register OBJECT *os; /* os' = os - cs */ |
| 672 |
< |
register OBJECT *cs; /* cs' = cs + os */ |
| 669 |
> |
static void |
| 670 |
> |
checkset( /* modify checked set and set to check */ |
| 671 |
> |
OBJECT *os, /* os' = os - cs */ |
| 672 |
> |
OBJECT *cs /* cs' = cs + os */ |
| 673 |
> |
) |
| 674 |
|
{ |
| 675 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
| 676 |
< |
register int i, j; |
| 676 |
> |
int i, j; |
| 677 |
|
int k; |
| 678 |
|
/* copy os in place, cset <- cs */ |
| 679 |
|
cset[0] = 0; |
