| 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 |
|
|
| 17 |
< |
extern CUBE thescene; /* our scene */ |
| 20 |
< |
extern int maxdepth; /* maximum recursion depth */ |
| 21 |
< |
extern double minweight; /* minimum ray weight */ |
| 17 |
> |
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
| 18 |
|
|
| 19 |
< |
long nrays = 0L; /* number of rays traced */ |
| 19 |
> |
unsigned long raynum = 0; /* next unique ray number */ |
| 20 |
> |
unsigned long nrays = 0; /* number of calls to localhit */ |
| 21 |
|
|
| 22 |
< |
#define MAXLOOP 32 /* modifier loop detection */ |
| 22 |
> |
static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
| 23 |
> |
OBJREC Lamb = { |
| 24 |
> |
OVOID, MAT_PLASTIC, "Lambertian", |
| 25 |
> |
{0, 5, NULL, Lambfa}, NULL, |
| 26 |
> |
}; /* a Lambertian surface */ |
| 27 |
|
|
| 28 |
+ |
OBJREC Aftplane; /* aft clipping plane object */ |
| 29 |
+ |
|
| 30 |
|
#define RAYHIT (-1) /* return value for intercepted ray */ |
| 31 |
|
|
| 32 |
+ |
static int raymove(FVECT pos, OBJECT *cxs, int dirf, RAY *r, CUBE *cu); |
| 33 |
+ |
static int checkhit(RAY *r, CUBE *cu, OBJECT *cxs); |
| 34 |
+ |
static void checkset(OBJECT *os, OBJECT *cs); |
| 35 |
|
|
| 36 |
< |
rayorigin(r, ro, rt, rw) /* start new ray from old one */ |
| 37 |
< |
register RAY *r, *ro; |
| 38 |
< |
int rt; |
| 39 |
< |
double rw; |
| 36 |
> |
|
| 37 |
> |
extern int |
| 38 |
> |
rayorigin( /* start new ray from old one */ |
| 39 |
> |
register RAY *r, |
| 40 |
> |
register RAY *ro, |
| 41 |
> |
int rt, |
| 42 |
> |
double rw |
| 43 |
> |
) |
| 44 |
|
{ |
| 45 |
+ |
double re; |
| 46 |
+ |
|
| 47 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
| 48 |
|
r->rlvl = 0; |
| 49 |
|
r->rweight = rw; |
| 50 |
|
r->crtype = r->rtype = rt; |
| 51 |
|
r->rsrc = -1; |
| 52 |
|
r->clipset = NULL; |
| 53 |
+ |
r->revf = raytrace; |
| 54 |
+ |
copycolor(r->cext, cextinction); |
| 55 |
+ |
copycolor(r->albedo, salbedo); |
| 56 |
+ |
r->gecc = seccg; |
| 57 |
+ |
r->slights = NULL; |
| 58 |
+ |
} else if (ro->rot >= FHUGE) { /* illegal continuation */ |
| 59 |
+ |
memset(r, 0, sizeof(RAY)); |
| 60 |
+ |
return(-1); |
| 61 |
|
} else { /* spawned ray */ |
| 62 |
|
r->rlvl = ro->rlvl; |
| 63 |
|
if (rt & RAYREFL) { |
| 64 |
|
r->rlvl++; |
| 65 |
|
r->rsrc = -1; |
| 66 |
|
r->clipset = ro->clipset; |
| 67 |
+ |
r->rmax = 0.0; |
| 68 |
|
} else { |
| 69 |
|
r->rsrc = ro->rsrc; |
| 70 |
|
r->clipset = ro->newcset; |
| 71 |
+ |
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
| 72 |
|
} |
| 73 |
< |
r->rweight = ro->rweight * rw; |
| 73 |
> |
r->revf = ro->revf; |
| 74 |
> |
copycolor(r->cext, ro->cext); |
| 75 |
> |
copycolor(r->albedo, ro->albedo); |
| 76 |
> |
r->gecc = ro->gecc; |
| 77 |
> |
r->slights = ro->slights; |
| 78 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
| 79 |
|
VCOPY(r->rorg, ro->rop); |
| 80 |
+ |
r->rweight = ro->rweight * rw; |
| 81 |
+ |
/* estimate absorption */ |
| 82 |
+ |
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
| 83 |
+ |
colval(ro->cext,RED) : colval(ro->cext,GRN); |
| 84 |
+ |
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
| 85 |
+ |
if (re > 0.) |
| 86 |
+ |
r->rweight *= exp(-re*ro->rot); |
| 87 |
|
} |
| 88 |
< |
r->rno = nrays; |
| 88 |
> |
rayclear(r); |
| 89 |
> |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
| 90 |
> |
} |
| 91 |
> |
|
| 92 |
> |
|
| 93 |
> |
extern void |
| 94 |
> |
rayclear( /* clear a ray for (re)evaluation */ |
| 95 |
> |
register RAY *r |
| 96 |
> |
) |
| 97 |
> |
{ |
| 98 |
> |
r->rno = raynum++; |
| 99 |
|
r->newcset = r->clipset; |
| 100 |
+ |
r->hitf = rayhit; |
| 101 |
+ |
r->robj = OVOID; |
| 102 |
|
r->ro = NULL; |
| 103 |
< |
r->rot = FHUGE; |
| 104 |
< |
r->ros = 1.0; setident4(r->rox); |
| 103 |
> |
r->rox = NULL; |
| 104 |
> |
r->rt = r->rot = FHUGE; |
| 105 |
|
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 106 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
| 107 |
|
setcolor(r->pcol, 1.0, 1.0, 1.0); |
| 108 |
|
setcolor(r->rcol, 0.0, 0.0, 0.0); |
| 63 |
– |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
| 109 |
|
} |
| 110 |
|
|
| 111 |
|
|
| 112 |
< |
rayvalue(r) /* compute a ray's value */ |
| 113 |
< |
register RAY *r; |
| 112 |
> |
extern void |
| 113 |
> |
raytrace( /* trace a ray and compute its value */ |
| 114 |
> |
RAY *r |
| 115 |
> |
) |
| 116 |
|
{ |
| 70 |
– |
extern int (*trace)(); |
| 71 |
– |
|
| 117 |
|
if (localhit(r, &thescene)) |
| 118 |
< |
if (r->clipset != NULL && inset(r->clipset, r->ro->omod)) |
| 119 |
< |
raytrans(r); /* object is clipped */ |
| 120 |
< |
else |
| 121 |
< |
rayshade(r, r->ro->omod); |
| 122 |
< |
else if (sourcehit(r)) |
| 123 |
< |
rayshade(r, r->ro->omod); |
| 118 |
> |
raycont(r); /* hit local surface, evaluate */ |
| 119 |
> |
else if (r->ro == &Aftplane) { |
| 120 |
> |
r->ro = NULL; /* hit aft clipping plane */ |
| 121 |
> |
r->rot = FHUGE; |
| 122 |
> |
} else if (sourcehit(r)) |
| 123 |
> |
rayshade(r, r->ro->omod); /* distant source */ |
| 124 |
|
|
| 125 |
+ |
rayparticipate(r); /* for participating medium */ |
| 126 |
+ |
|
| 127 |
|
if (trace != NULL) |
| 128 |
|
(*trace)(r); /* trace execution */ |
| 129 |
|
} |
| 130 |
|
|
| 131 |
|
|
| 132 |
< |
raytrans(r) /* transmit ray as is */ |
| 133 |
< |
RAY *r; |
| 132 |
> |
extern void |
| 133 |
> |
raycont( /* check for clipped object and continue */ |
| 134 |
> |
register RAY *r |
| 135 |
> |
) |
| 136 |
|
{ |
| 137 |
+ |
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
| 138 |
+ |
!rayshade(r, r->ro->omod)) |
| 139 |
+ |
raytrans(r); |
| 140 |
+ |
} |
| 141 |
+ |
|
| 142 |
+ |
|
| 143 |
+ |
extern void |
| 144 |
+ |
raytrans( /* transmit ray as is */ |
| 145 |
+ |
register RAY *r |
| 146 |
+ |
) |
| 147 |
+ |
{ |
| 148 |
|
RAY tr; |
| 149 |
|
|
| 150 |
|
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
| 151 |
|
VCOPY(tr.rdir, r->rdir); |
| 152 |
|
rayvalue(&tr); |
| 153 |
|
copycolor(r->rcol, tr.rcol); |
| 154 |
+ |
r->rt = r->rot + tr.rt; |
| 155 |
|
} |
| 156 |
|
} |
| 157 |
|
|
| 158 |
|
|
| 159 |
< |
rayshade(r, mod) /* shade ray r with material mod */ |
| 160 |
< |
register RAY *r; |
| 161 |
< |
int mod; |
| 159 |
> |
extern int |
| 160 |
> |
rayshade( /* shade ray r with material mod */ |
| 161 |
> |
register RAY *r, |
| 162 |
> |
int mod |
| 163 |
> |
) |
| 164 |
|
{ |
| 165 |
< |
static int depth = 0; |
| 165 |
> |
int gotmat; |
| 166 |
|
register OBJREC *m; |
| 167 |
< |
/* check for infinite loop */ |
| 168 |
< |
if (depth++ >= MAXLOOP) |
| 106 |
< |
objerror(r->ro, USER, "material loop"); |
| 107 |
< |
for ( ; mod != OVOID; mod = m->omod) { |
| 167 |
> |
r->rt = r->rot; /* set effective ray length */ |
| 168 |
> |
for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
| 169 |
|
m = objptr(mod); |
| 170 |
+ |
/****** unnecessary test since modifier() is always called |
| 171 |
|
if (!ismodifier(m->otype)) { |
| 172 |
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
| 173 |
|
error(USER, errmsg); |
| 174 |
|
} |
| 175 |
< |
(*ofun[m->otype].funp)(m, r); /* execute function */ |
| 176 |
< |
m->lastrno = r->rno; |
| 177 |
< |
if (ismaterial(m->otype)) { /* materials call raytexture */ |
| 178 |
< |
depth--; |
| 179 |
< |
return; /* we're done */ |
| 175 |
> |
******/ |
| 176 |
> |
/* hack for irradiance calculation */ |
| 177 |
> |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
| 178 |
> |
m->otype != MAT_CLIP && |
| 179 |
> |
(ofun[m->otype].flags & (T_M|T_X))) { |
| 180 |
> |
if (irr_ignore(m->otype)) { |
| 181 |
> |
raytrans(r); |
| 182 |
> |
return(1); |
| 183 |
> |
} |
| 184 |
> |
if (!islight(m->otype)) |
| 185 |
> |
m = &Lamb; |
| 186 |
|
} |
| 187 |
+ |
/* materials call raytexture */ |
| 188 |
+ |
gotmat = (*ofun[m->otype].funp)(m, r); |
| 189 |
|
} |
| 190 |
< |
objerror(r->ro, USER, "material not found"); |
| 190 |
> |
return(gotmat); |
| 191 |
|
} |
| 192 |
|
|
| 193 |
|
|
| 194 |
< |
raytexture(r, mod) /* get material modifiers */ |
| 195 |
< |
RAY *r; |
| 196 |
< |
int mod; |
| 194 |
> |
extern void |
| 195 |
> |
rayparticipate( /* compute ray medium participation */ |
| 196 |
> |
register RAY *r |
| 197 |
> |
) |
| 198 |
|
{ |
| 199 |
< |
static int depth = 0; |
| 199 |
> |
COLOR ce, ca; |
| 200 |
> |
double re, ge, be; |
| 201 |
> |
|
| 202 |
> |
if (intens(r->cext) <= 1./FHUGE) |
| 203 |
> |
return; /* no medium */ |
| 204 |
> |
re = r->rot*colval(r->cext,RED); |
| 205 |
> |
ge = r->rot*colval(r->cext,GRN); |
| 206 |
> |
be = r->rot*colval(r->cext,BLU); |
| 207 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
| 208 |
> |
re *= 1. - colval(r->albedo,RED); |
| 209 |
> |
ge *= 1. - colval(r->albedo,GRN); |
| 210 |
> |
be *= 1. - colval(r->albedo,BLU); |
| 211 |
> |
} |
| 212 |
> |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
| 213 |
> |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
| 214 |
> |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
| 215 |
> |
multcolor(r->rcol, ce); /* path absorption */ |
| 216 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
| 217 |
> |
return; /* no scattering */ |
| 218 |
> |
setcolor(ca, |
| 219 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
| 220 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
| 221 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
| 222 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
| 223 |
> |
srcscatter(r); /* source in scattering */ |
| 224 |
> |
} |
| 225 |
> |
|
| 226 |
> |
|
| 227 |
> |
extern void |
| 228 |
> |
raytexture( /* get material modifiers */ |
| 229 |
> |
RAY *r, |
| 230 |
> |
OBJECT mod |
| 231 |
> |
) |
| 232 |
> |
{ |
| 233 |
|
register OBJREC *m; |
| 130 |
– |
/* check for infinite loop */ |
| 131 |
– |
if (depth++ >= MAXLOOP) |
| 132 |
– |
objerror(r->ro, USER, "modifier loop"); |
| 234 |
|
/* execute textures and patterns */ |
| 235 |
|
for ( ; mod != OVOID; mod = m->omod) { |
| 236 |
|
m = objptr(mod); |
| 237 |
< |
if (!istexture(m->otype)) { |
| 237 |
> |
/****** unnecessary test since modifier() is always called |
| 238 |
> |
if (!ismodifier(m->otype)) { |
| 239 |
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
| 240 |
|
error(USER, errmsg); |
| 241 |
|
} |
| 242 |
< |
(*ofun[m->otype].funp)(m, r); |
| 243 |
< |
m->lastrno = r->rno; |
| 242 |
> |
******/ |
| 243 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
| 244 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
| 245 |
> |
m->oname); |
| 246 |
> |
objerror(r->ro, USER, errmsg); |
| 247 |
> |
} |
| 248 |
|
} |
| 143 |
– |
depth--; /* end here */ |
| 249 |
|
} |
| 250 |
|
|
| 251 |
|
|
| 252 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
| 253 |
< |
register RAY *r; |
| 254 |
< |
OBJECT fore, back; |
| 255 |
< |
double coef; |
| 252 |
> |
extern int |
| 253 |
> |
raymixture( /* mix modifiers */ |
| 254 |
> |
register RAY *r, |
| 255 |
> |
OBJECT fore, |
| 256 |
> |
OBJECT back, |
| 257 |
> |
double coef |
| 258 |
> |
) |
| 259 |
|
{ |
| 260 |
< |
FVECT curpert, forepert, backpert; |
| 261 |
< |
COLOR curpcol, forepcol, backpcol; |
| 260 |
> |
RAY fr, br; |
| 261 |
> |
int foremat, backmat; |
| 262 |
|
register int i; |
| 263 |
< |
/* clip coefficient */ |
| 263 |
> |
/* bound coefficient */ |
| 264 |
|
if (coef > 1.0) |
| 265 |
|
coef = 1.0; |
| 266 |
|
else if (coef < 0.0) |
| 267 |
|
coef = 0.0; |
| 268 |
< |
/* save current mods */ |
| 269 |
< |
VCOPY(curpert, r->pert); |
| 270 |
< |
copycolor(curpcol, r->pcol); |
| 271 |
< |
/* compute new mods */ |
| 272 |
< |
/* foreground */ |
| 273 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 274 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
| 275 |
< |
if (fore != OVOID && coef > FTINY) |
| 276 |
< |
raytexture(r, fore); |
| 277 |
< |
VCOPY(forepert, r->pert); |
| 278 |
< |
copycolor(forepcol, r->pcol); |
| 279 |
< |
/* background */ |
| 280 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 281 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
| 282 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
| 283 |
< |
raytexture(r, back); |
| 284 |
< |
VCOPY(backpert, r->pert); |
| 285 |
< |
copycolor(backpcol, r->pcol); |
| 178 |
< |
/* sum perturbations */ |
| 268 |
> |
/* compute foreground and background */ |
| 269 |
> |
foremat = backmat = 0; |
| 270 |
> |
/* foreground */ |
| 271 |
> |
fr = *r; |
| 272 |
> |
if (coef > FTINY) |
| 273 |
> |
foremat = rayshade(&fr, fore); |
| 274 |
> |
/* background */ |
| 275 |
> |
br = *r; |
| 276 |
> |
if (coef < 1.0-FTINY) |
| 277 |
> |
backmat = rayshade(&br, back); |
| 278 |
> |
/* check for transparency */ |
| 279 |
> |
if (backmat ^ foremat) { |
| 280 |
> |
if (backmat && coef > FTINY) |
| 281 |
> |
raytrans(&fr); |
| 282 |
> |
else if (foremat && coef < 1.0-FTINY) |
| 283 |
> |
raytrans(&br); |
| 284 |
> |
} |
| 285 |
> |
/* mix perturbations */ |
| 286 |
|
for (i = 0; i < 3; i++) |
| 287 |
< |
r->pert[i] = curpert[i] + coef*forepert[i] + |
| 288 |
< |
(1.0-coef)*backpert[i]; |
| 289 |
< |
/* multiply colors */ |
| 290 |
< |
setcolor(r->pcol, coef*colval(forepcol,RED) + |
| 291 |
< |
(1.0-coef)*colval(backpcol,RED), |
| 292 |
< |
coef*colval(forepcol,GRN) + |
| 293 |
< |
(1.0-coef)*colval(backpcol,GRN), |
| 294 |
< |
coef*colval(forepcol,BLU) + |
| 295 |
< |
(1.0-coef)*colval(backpcol,BLU)); |
| 296 |
< |
multcolor(r->pcol, curpcol); |
| 287 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
| 288 |
> |
/* mix pattern colors */ |
| 289 |
> |
scalecolor(fr.pcol, coef); |
| 290 |
> |
scalecolor(br.pcol, 1.0-coef); |
| 291 |
> |
copycolor(r->pcol, fr.pcol); |
| 292 |
> |
addcolor(r->pcol, br.pcol); |
| 293 |
> |
/* return value tells if material */ |
| 294 |
> |
if (!foremat & !backmat) |
| 295 |
> |
return(0); |
| 296 |
> |
/* mix returned ray values */ |
| 297 |
> |
scalecolor(fr.rcol, coef); |
| 298 |
> |
scalecolor(br.rcol, 1.0-coef); |
| 299 |
> |
copycolor(r->rcol, fr.rcol); |
| 300 |
> |
addcolor(r->rcol, br.rcol); |
| 301 |
> |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
| 302 |
> |
return(1); |
| 303 |
|
} |
| 304 |
|
|
| 305 |
|
|
| 306 |
< |
double |
| 307 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
| 308 |
< |
FVECT norm; |
| 309 |
< |
register RAY *r; |
| 306 |
> |
extern double |
| 307 |
> |
raydist( /* compute (cumulative) ray distance */ |
| 308 |
> |
register RAY *r, |
| 309 |
> |
register int flags |
| 310 |
> |
) |
| 311 |
|
{ |
| 312 |
+ |
double sum = 0.0; |
| 313 |
+ |
|
| 314 |
+ |
while (r != NULL && r->crtype&flags) { |
| 315 |
+ |
sum += r->rot; |
| 316 |
+ |
r = r->parent; |
| 317 |
+ |
} |
| 318 |
+ |
return(sum); |
| 319 |
+ |
} |
| 320 |
+ |
|
| 321 |
+ |
|
| 322 |
+ |
extern double |
| 323 |
+ |
raynormal( /* compute perturbed normal for ray */ |
| 324 |
+ |
FVECT norm, |
| 325 |
+ |
register RAY *r |
| 326 |
+ |
) |
| 327 |
+ |
{ |
| 328 |
|
double newdot; |
| 329 |
|
register int i; |
| 330 |
|
|
| 334 |
|
* still fraught with problems since reflected rays and similar |
| 335 |
|
* directions calculated from the surface normal may spawn rays behind |
| 336 |
|
* the surface. The only solution is to curb textures at high |
| 337 |
< |
* incidence (Rdot << 1). |
| 337 |
> |
* incidence (namely, keep DOT(rdir,pert) < Rdot). |
| 338 |
|
*/ |
| 339 |
|
|
| 340 |
|
for (i = 0; i < 3; i++) |
| 355 |
|
} |
| 356 |
|
|
| 357 |
|
|
| 358 |
< |
flipsurface(r) /* reverse surface orientation */ |
| 359 |
< |
register RAY *r; |
| 358 |
> |
extern void |
| 359 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
| 360 |
> |
RAY *r |
| 361 |
> |
) |
| 362 |
|
{ |
| 363 |
+ |
static struct xfn { |
| 364 |
+ |
struct xfn *next; |
| 365 |
+ |
FULLXF xf; |
| 366 |
+ |
} xfseed = { &xfseed }, *xflast = &xfseed; |
| 367 |
+ |
register struct xfn *xp; |
| 368 |
+ |
register RAY *rp; |
| 369 |
+ |
|
| 370 |
+ |
/* |
| 371 |
+ |
* Search for transform in circular list that |
| 372 |
+ |
* has no associated ray in the tree. |
| 373 |
+ |
*/ |
| 374 |
+ |
xp = xflast; |
| 375 |
+ |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
| 376 |
+ |
if (rp->rox == &xp->xf) { /* xp in use */ |
| 377 |
+ |
xp = xp->next; /* move to next */ |
| 378 |
+ |
if (xp == xflast) { /* need new one */ |
| 379 |
+ |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
| 380 |
+ |
if (xp == NULL) |
| 381 |
+ |
error(SYSTEM, |
| 382 |
+ |
"out of memory in newrayxf"); |
| 383 |
+ |
/* insert in list */ |
| 384 |
+ |
xp->next = xflast->next; |
| 385 |
+ |
xflast->next = xp; |
| 386 |
+ |
break; /* we're done */ |
| 387 |
+ |
} |
| 388 |
+ |
rp = r; /* start check over */ |
| 389 |
+ |
} |
| 390 |
+ |
/* got it */ |
| 391 |
+ |
r->rox = &xp->xf; |
| 392 |
+ |
xflast = xp; |
| 393 |
+ |
} |
| 394 |
+ |
|
| 395 |
+ |
|
| 396 |
+ |
extern void |
| 397 |
+ |
flipsurface( /* reverse surface orientation */ |
| 398 |
+ |
register RAY *r |
| 399 |
+ |
) |
| 400 |
+ |
{ |
| 401 |
|
r->rod = -r->rod; |
| 402 |
|
r->ron[0] = -r->ron[0]; |
| 403 |
|
r->ron[1] = -r->ron[1]; |
| 408 |
|
} |
| 409 |
|
|
| 410 |
|
|
| 411 |
< |
localhit(r, scene) /* check for hit in the octree */ |
| 412 |
< |
register RAY *r; |
| 413 |
< |
register CUBE *scene; |
| 411 |
> |
extern void |
| 412 |
> |
rayhit( /* standard ray hit test */ |
| 413 |
> |
OBJECT *oset, |
| 414 |
> |
RAY *r |
| 415 |
> |
) |
| 416 |
|
{ |
| 417 |
+ |
OBJREC *o; |
| 418 |
+ |
int i; |
| 419 |
+ |
|
| 420 |
+ |
for (i = oset[0]; i > 0; i--) { |
| 421 |
+ |
o = objptr(oset[i]); |
| 422 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
| 423 |
+ |
r->robj = oset[i]; |
| 424 |
+ |
} |
| 425 |
+ |
} |
| 426 |
+ |
|
| 427 |
+ |
|
| 428 |
+ |
extern int |
| 429 |
+ |
localhit( /* check for hit in the octree */ |
| 430 |
+ |
register RAY *r, |
| 431 |
+ |
register CUBE *scene |
| 432 |
+ |
) |
| 433 |
+ |
{ |
| 434 |
+ |
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
| 435 |
|
FVECT curpos; /* current cube position */ |
| 436 |
< |
int mpos, mneg; /* sign flags */ |
| 436 |
> |
int sflags; /* sign flags */ |
| 437 |
|
double t, dt; |
| 438 |
|
register int i; |
| 439 |
|
|
| 440 |
|
nrays++; /* increment trace counter */ |
| 441 |
< |
|
| 252 |
< |
mpos = mneg = 0; |
| 441 |
> |
sflags = 0; |
| 442 |
|
for (i = 0; i < 3; i++) { |
| 443 |
|
curpos[i] = r->rorg[i]; |
| 444 |
< |
if (r->rdir[i] > FTINY) |
| 445 |
< |
mpos |= 1 << i; |
| 446 |
< |
else if (r->rdir[i] < -FTINY) |
| 447 |
< |
mneg |= 1 << i; |
| 444 |
> |
if (r->rdir[i] > 1e-7) |
| 445 |
> |
sflags |= 1 << i; |
| 446 |
> |
else if (r->rdir[i] < -1e-7) |
| 447 |
> |
sflags |= 0x10 << i; |
| 448 |
|
} |
| 449 |
+ |
if (sflags == 0) |
| 450 |
+ |
error(CONSISTENCY, "zero ray direction in localhit"); |
| 451 |
+ |
/* start off assuming nothing hit */ |
| 452 |
+ |
if (r->rmax > FTINY) { /* except aft plane if one */ |
| 453 |
+ |
r->ro = &Aftplane; |
| 454 |
+ |
r->rot = r->rmax; |
| 455 |
+ |
for (i = 0; i < 3; i++) |
| 456 |
+ |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
| 457 |
+ |
} |
| 458 |
+ |
/* find global cube entrance point */ |
| 459 |
|
t = 0.0; |
| 460 |
|
if (!incube(scene, curpos)) { |
| 461 |
|
/* find distance to entry */ |
| 462 |
|
for (i = 0; i < 3; i++) { |
| 463 |
|
/* plane in our direction */ |
| 464 |
< |
if (mpos & 1<<i) |
| 464 |
> |
if (sflags & 1<<i) |
| 465 |
|
dt = scene->cuorg[i]; |
| 466 |
< |
else if (mneg & 1<<i) |
| 466 |
> |
else if (sflags & 0x10<<i) |
| 467 |
|
dt = scene->cuorg[i] + scene->cusize; |
| 468 |
|
else |
| 469 |
|
continue; |
| 473 |
|
t = dt; /* farthest face is the one */ |
| 474 |
|
} |
| 475 |
|
t += FTINY; /* fudge to get inside cube */ |
| 476 |
+ |
if (t >= r->rot) /* clipped already */ |
| 477 |
+ |
return(0); |
| 478 |
|
/* advance position */ |
| 479 |
|
for (i = 0; i < 3; i++) |
| 480 |
|
curpos[i] += r->rdir[i]*t; |
| 482 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
| 483 |
|
return(0); |
| 484 |
|
} |
| 485 |
< |
return(raymove(curpos, mpos, mneg, r, scene) == RAYHIT); |
| 485 |
> |
cxset[0] = 0; |
| 486 |
> |
raymove(curpos, cxset, sflags, r, scene); |
| 487 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
| 488 |
|
} |
| 489 |
|
|
| 490 |
|
|
| 491 |
|
static int |
| 492 |
< |
raymove(pos, plus, minus, r, cu) /* check for hit as we move */ |
| 493 |
< |
FVECT pos; /* modified */ |
| 494 |
< |
int plus, minus; /* direction indicators to speed tests */ |
| 495 |
< |
register RAY *r; |
| 496 |
< |
register CUBE *cu; |
| 492 |
> |
raymove( /* check for hit as we move */ |
| 493 |
> |
FVECT pos, /* current position, modified herein */ |
| 494 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
| 495 |
> |
int dirf, /* direction indicators to speed tests */ |
| 496 |
> |
register RAY *r, |
| 497 |
> |
register CUBE *cu |
| 498 |
> |
) |
| 499 |
|
{ |
| 500 |
|
int ax; |
| 501 |
|
double dt, t; |
| 297 |
– |
register int sgn; |
| 502 |
|
|
| 503 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
| 504 |
|
CUBE cukid; |
| 505 |
< |
register int br; |
| 505 |
> |
register int br, sgn; |
| 506 |
|
|
| 507 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
| 508 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
| 521 |
|
} |
| 522 |
|
for ( ; ; ) { |
| 523 |
|
cukid.cutree = octkid(cu->cutree, br); |
| 524 |
< |
if ((ax = raymove(pos,plus,minus,r,&cukid)) == RAYHIT) |
| 524 |
> |
if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
| 525 |
|
return(RAYHIT); |
| 526 |
|
sgn = 1 << ax; |
| 527 |
< |
if (sgn & minus) /* negative axis? */ |
| 324 |
< |
if (sgn & br) { |
| 325 |
< |
cukid.cuorg[ax] -= cukid.cusize; |
| 326 |
< |
br &= ~sgn; |
| 327 |
< |
} else |
| 328 |
< |
return(ax); /* underflow */ |
| 329 |
< |
else |
| 527 |
> |
if (sgn & dirf) /* positive axis? */ |
| 528 |
|
if (sgn & br) |
| 529 |
|
return(ax); /* overflow */ |
| 530 |
|
else { |
| 531 |
|
cukid.cuorg[ax] += cukid.cusize; |
| 532 |
|
br |= sgn; |
| 533 |
|
} |
| 534 |
+ |
else |
| 535 |
+ |
if (sgn & br) { |
| 536 |
+ |
cukid.cuorg[ax] -= cukid.cusize; |
| 537 |
+ |
br &= ~sgn; |
| 538 |
+ |
} else |
| 539 |
+ |
return(ax); /* underflow */ |
| 540 |
|
} |
| 541 |
|
/*NOTREACHED*/ |
| 542 |
|
} |
| 543 |
< |
if (isfull(cu->cutree) && checkhit(r, cu)) |
| 543 |
> |
if (isfull(cu->cutree)) { |
| 544 |
> |
if (checkhit(r, cu, cxs)) |
| 545 |
> |
return(RAYHIT); |
| 546 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
| 547 |
|
return(RAYHIT); |
| 548 |
|
/* advance to next cube */ |
| 549 |
< |
sgn = plus | minus; |
| 550 |
< |
if (sgn&1) { |
| 344 |
< |
dt = plus&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
| 549 |
> |
if (dirf&0x11) { |
| 550 |
> |
dt = dirf&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
| 551 |
|
t = (dt - pos[0])/r->rdir[0]; |
| 552 |
|
ax = 0; |
| 553 |
|
} else |
| 554 |
|
t = FHUGE; |
| 555 |
< |
if (sgn&2) { |
| 556 |
< |
dt = plus&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
| 555 |
> |
if (dirf&0x22) { |
| 556 |
> |
dt = dirf&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
| 557 |
|
dt = (dt - pos[1])/r->rdir[1]; |
| 558 |
|
if (dt < t) { |
| 559 |
|
t = dt; |
| 560 |
|
ax = 1; |
| 561 |
|
} |
| 562 |
|
} |
| 563 |
< |
if (sgn&4) { |
| 564 |
< |
dt = plus&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
| 563 |
> |
if (dirf&0x44) { |
| 564 |
> |
dt = dirf&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
| 565 |
|
dt = (dt - pos[2])/r->rdir[2]; |
| 566 |
|
if (dt < t) { |
| 567 |
|
t = dt; |
| 575 |
|
} |
| 576 |
|
|
| 577 |
|
|
| 578 |
< |
static |
| 579 |
< |
checkhit(r, cu) /* check for hit in full cube */ |
| 580 |
< |
register RAY *r; |
| 581 |
< |
CUBE *cu; |
| 578 |
> |
static int |
| 579 |
> |
checkhit( /* check for hit in full cube */ |
| 580 |
> |
register RAY *r, |
| 581 |
> |
CUBE *cu, |
| 582 |
> |
OBJECT *cxs |
| 583 |
> |
) |
| 584 |
|
{ |
| 585 |
|
OBJECT oset[MAXSET+1]; |
| 378 |
– |
register OBJREC *o; |
| 379 |
– |
register int i; |
| 586 |
|
|
| 587 |
|
objset(oset, cu->cutree); |
| 588 |
< |
for (i = oset[0]; i > 0; i--) { |
| 589 |
< |
o = objptr(oset[i]); |
| 590 |
< |
if (o->lastrno == r->rno) /* checked already? */ |
| 591 |
< |
continue; |
| 592 |
< |
(*ofun[o->otype].funp)(o, r); |
| 387 |
< |
o->lastrno = r->rno; |
| 388 |
< |
} |
| 389 |
< |
if (r->ro == NULL) |
| 588 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
| 589 |
> |
|
| 590 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
| 591 |
> |
|
| 592 |
> |
if (r->robj == OVOID) |
| 593 |
|
return(0); /* no scores yet */ |
| 594 |
|
|
| 595 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
| 596 |
+ |
} |
| 597 |
+ |
|
| 598 |
+ |
|
| 599 |
+ |
static void |
| 600 |
+ |
checkset( /* modify checked set and set to check */ |
| 601 |
+ |
register OBJECT *os, /* os' = os - cs */ |
| 602 |
+ |
register OBJECT *cs /* cs' = cs + os */ |
| 603 |
+ |
) |
| 604 |
+ |
{ |
| 605 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
| 606 |
+ |
register int i, j; |
| 607 |
+ |
int k; |
| 608 |
+ |
/* copy os in place, cset <- cs */ |
| 609 |
+ |
cset[0] = 0; |
| 610 |
+ |
k = 0; |
| 611 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
| 612 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
| 613 |
+ |
cset[++cset[0]] = cs[j++]; |
| 614 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
| 615 |
+ |
os[++k] = os[i]; |
| 616 |
+ |
cset[++cset[0]] = os[i]; |
| 617 |
+ |
} |
| 618 |
+ |
} |
| 619 |
+ |
if (!(os[0] = k)) /* new "to check" set size */ |
| 620 |
+ |
return; /* special case */ |
| 621 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
| 622 |
+ |
cset[++cset[0]] = cs[j++]; |
| 623 |
+ |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
| 624 |
+ |
cset[0] = MAXCSET; |
| 625 |
+ |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
| 626 |
+ |
os = cset; |
| 627 |
+ |
for (i = os[0]; i-- >= 0; ) |
| 628 |
+ |
*cs++ = *os++; |
| 629 |
|
} |