| 1 |
< |
/* Copyright (c) 1995 Regents of the University of California */ |
| 1 |
> |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
|
| 3 |
|
#ifndef lint |
| 4 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 4 |
> |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
|
#endif |
| 6 |
|
|
| 7 |
|
/* |
| 27 |
|
extern COLOR ambval; /* ambient value */ |
| 28 |
|
|
| 29 |
|
extern COLOR cextinction; /* global extinction coefficient */ |
| 30 |
< |
extern double salbedo; /* global scattering albedo */ |
| 30 |
> |
extern COLOR salbedo; /* global scattering albedo */ |
| 31 |
|
extern double seccg; /* global scattering eccentricity */ |
| 32 |
|
extern double ssampdist; /* scatter sampling distance */ |
| 33 |
|
|
| 54 |
|
int rt; |
| 55 |
|
double rw; |
| 56 |
|
{ |
| 57 |
+ |
double re; |
| 58 |
+ |
|
| 59 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
| 60 |
|
r->rlvl = 0; |
| 61 |
|
r->rweight = rw; |
| 64 |
|
r->clipset = NULL; |
| 65 |
|
r->revf = raytrace; |
| 66 |
|
copycolor(r->cext, cextinction); |
| 67 |
< |
r->albedo = salbedo; |
| 67 |
> |
copycolor(r->albedo, salbedo); |
| 68 |
|
r->gecc = seccg; |
| 69 |
|
r->slights = NULL; |
| 70 |
|
} else { /* spawned ray */ |
| 81 |
|
} |
| 82 |
|
r->revf = ro->revf; |
| 83 |
|
copycolor(r->cext, ro->cext); |
| 84 |
< |
r->albedo = ro->albedo; |
| 84 |
> |
copycolor(r->albedo, ro->albedo); |
| 85 |
|
r->gecc = ro->gecc; |
| 86 |
|
r->slights = ro->slights; |
| 85 |
– |
r->rweight = ro->rweight * rw; |
| 87 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
| 88 |
|
VCOPY(r->rorg, ro->rop); |
| 89 |
+ |
r->rweight = ro->rweight * rw; |
| 90 |
+ |
/* estimate absorption */ |
| 91 |
+ |
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
| 92 |
+ |
colval(ro->cext,RED) : colval(ro->cext,GRN); |
| 93 |
+ |
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
| 94 |
+ |
if (re > 0.) |
| 95 |
+ |
r->rweight *= exp(-re*ro->rot); |
| 96 |
|
} |
| 97 |
|
rayclear(r); |
| 98 |
|
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
| 104 |
|
{ |
| 105 |
|
r->rno = raynum++; |
| 106 |
|
r->newcset = r->clipset; |
| 107 |
+ |
r->robj = OVOID; |
| 108 |
|
r->ro = NULL; |
| 109 |
< |
r->rot = FHUGE; |
| 109 |
> |
r->rt = r->rot = FHUGE; |
| 110 |
|
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 111 |
|
setcolor(r->pcol, 1.0, 1.0, 1.0); |
| 112 |
|
setcolor(r->rcol, 0.0, 0.0, 0.0); |
| 104 |
– |
r->rt = 0.0; |
| 113 |
|
} |
| 114 |
|
|
| 115 |
|
|
| 197 |
|
register RAY *r; |
| 198 |
|
{ |
| 199 |
|
COLOR ce, ca; |
| 192 |
– |
double dist; |
| 200 |
|
double re, ge, be; |
| 201 |
|
|
| 202 |
|
if (intens(r->cext) <= 1./FHUGE) |
| 203 |
|
return; /* no medium */ |
| 204 |
< |
if ((dist = r->rot) >= FHUGE) |
| 205 |
< |
dist = 2.*thescene.cusize; /* what to use for infinity? */ |
| 206 |
< |
if (r->crtype & SHADOW) |
| 207 |
< |
dist *= 1. - salbedo; /* no scattering for sources */ |
| 208 |
< |
if (dist <= FTINY) |
| 209 |
< |
return; /* no effective ray travel */ |
| 210 |
< |
re = dist*colval(r->cext,RED); |
| 211 |
< |
ge = dist*colval(r->cext,GRN); |
| 212 |
< |
be = dist*colval(r->cext,BLU); |
| 213 |
< |
setcolor(ce, re>92. ? 0. : exp(-re), |
| 214 |
< |
ge>92. ? 0. : exp(-ge), |
| 208 |
< |
be>92. ? 0. : exp(-be)); |
| 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->albedo <= FTINY || r->crtype & SHADOW) |
| 216 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
| 217 |
|
return; /* no scattering */ |
| 218 |
< |
setcolor(ca, salbedo*colval(ambval,RED)*(1.-colval(ce,RED)), |
| 219 |
< |
salbedo*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
| 220 |
< |
salbedo*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
| 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 |
|
} |
| 277 |
|
backmat = rayshade(&br, back); |
| 278 |
|
/* check for transparency */ |
| 279 |
|
if (backmat ^ foremat) |
| 280 |
< |
if (backmat) |
| 280 |
> |
if (!foremat && coef > FTINY) |
| 281 |
|
raytrans(&fr); |
| 282 |
< |
else |
| 282 |
> |
else if (!backmat && coef < 1.0-FTINY) |
| 283 |
|
raytrans(&br); |
| 284 |
|
/* mix perturbations */ |
| 285 |
|
for (i = 0; i < 3; i++) |
| 562 |
|
checkset(oset, cxs); /* eliminate double-checking */ |
| 563 |
|
for (i = oset[0]; i > 0; i--) { |
| 564 |
|
o = objptr(oset[i]); |
| 565 |
< |
(*ofun[o->otype].funp)(o, r); |
| 565 |
> |
if ((*ofun[o->otype].funp)(o, r)) |
| 566 |
> |
r->robj = oset[i]; |
| 567 |
|
} |
| 568 |
|
if (r->ro == NULL) |
| 569 |
|
return(0); /* no scores yet */ |
