27 |
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extern COLOR ambval; /* ambient value */ |
28 |
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|
29 |
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extern COLOR cextinction; /* global extinction coefficient */ |
30 |
< |
extern double salbedo; /* global scattering albedo */ |
30 |
> |
extern COLOR salbedo; /* global scattering albedo */ |
31 |
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extern double seccg; /* global scattering eccentricity */ |
32 |
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extern double ssampdist; /* scatter sampling distance */ |
33 |
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|
62 |
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r->clipset = NULL; |
63 |
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r->revf = raytrace; |
64 |
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copycolor(r->cext, cextinction); |
65 |
< |
r->albedo = salbedo; |
65 |
> |
copycolor(r->albedo, salbedo); |
66 |
|
r->gecc = seccg; |
67 |
|
r->slights = NULL; |
68 |
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} else { /* spawned ray */ |
79 |
|
} |
80 |
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r->revf = ro->revf; |
81 |
|
copycolor(r->cext, ro->cext); |
82 |
< |
r->albedo = ro->albedo; |
82 |
> |
copycolor(r->albedo, ro->albedo); |
83 |
|
r->gecc = ro->gecc; |
84 |
|
r->slights = ro->slights; |
85 |
|
r->rweight = ro->rweight * rw; |
196 |
|
return; /* no medium */ |
197 |
|
if ((dist = r->rot) >= FHUGE) |
198 |
|
dist = 2.*thescene.cusize; /* what to use for infinity? */ |
199 |
– |
if (r->crtype & SHADOW) |
200 |
– |
dist *= 1. - r->albedo; /* no scattering for sources */ |
201 |
– |
if (dist <= FTINY) |
202 |
– |
return; /* no effective ray travel */ |
199 |
|
re = dist*colval(r->cext,RED); |
200 |
|
ge = dist*colval(r->cext,GRN); |
201 |
|
be = dist*colval(r->cext,BLU); |
202 |
< |
setcolor(ce, re>92. ? 0. : exp(-re), |
203 |
< |
ge>92. ? 0. : exp(-ge), |
204 |
< |
be>92. ? 0. : exp(-be)); |
202 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
203 |
> |
re *= 1. - colval(r->albedo,RED); |
204 |
> |
ge *= 1. - colval(r->albedo,GRN); |
205 |
> |
be *= 1. - colval(r->albedo,BLU); |
206 |
> |
} |
207 |
> |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
208 |
> |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
209 |
> |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
210 |
|
multcolor(r->rcol, ce); /* path absorption */ |
211 |
< |
if (r->albedo <= FTINY || r->crtype & SHADOW) |
211 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
212 |
|
return; /* no scattering */ |
213 |
< |
setcolor(ca, r->albedo*colval(ambval,RED)*(1.-colval(ce,RED)), |
214 |
< |
r->albedo*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
215 |
< |
r->albedo*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
213 |
> |
setcolor(ca, |
214 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
215 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
216 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
217 |
|
addcolor(r->rcol, ca); /* ambient in scattering */ |
218 |
|
srcscatter(r); /* source in scattering */ |
219 |
|
} |