| 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 |
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r->gecc = seccg; |
| 67 |
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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 |
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r->gecc = ro->gecc; |
| 84 |
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r->slights = ro->slights; |
| 85 |
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r->rweight = ro->rweight * rw; |
| 189 |
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register RAY *r; |
| 190 |
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{ |
| 191 |
|
COLOR ce, ca; |
| 192 |
– |
double dist; |
| 192 |
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double re, ge, be; |
| 193 |
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|
| 194 |
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if (intens(r->cext) <= 1./FHUGE) |
| 195 |
|
return; /* no medium */ |
| 196 |
< |
if ((dist = r->rot) >= FHUGE) |
| 197 |
< |
dist = 2.*thescene.cusize; /* what to use for infinity? */ |
| 198 |
< |
if (r->crtype & SHADOW) |
| 199 |
< |
dist *= 1. - r->albedo; /* no scattering for sources */ |
| 200 |
< |
if (dist <= FTINY) |
| 201 |
< |
return; /* no effective ray travel */ |
| 202 |
< |
re = dist*colval(r->cext,RED); |
| 203 |
< |
ge = dist*colval(r->cext,GRN); |
| 204 |
< |
be = dist*colval(r->cext,BLU); |
| 205 |
< |
setcolor(ce, re>92. ? 0. : exp(-re), |
| 206 |
< |
ge>92. ? 0. : exp(-ge), |
| 208 |
< |
be>92. ? 0. : exp(-be)); |
| 196 |
> |
re = r->rot*colval(r->cext,RED); |
| 197 |
> |
ge = r->rot*colval(r->cext,GRN); |
| 198 |
> |
be = r->rot*colval(r->cext,BLU); |
| 199 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
| 200 |
> |
re *= 1. - colval(r->albedo,RED); |
| 201 |
> |
ge *= 1. - colval(r->albedo,GRN); |
| 202 |
> |
be *= 1. - colval(r->albedo,BLU); |
| 203 |
> |
} |
| 204 |
> |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
| 205 |
> |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
| 206 |
> |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
| 207 |
|
multcolor(r->rcol, ce); /* path absorption */ |
| 208 |
< |
if (r->albedo <= FTINY || r->crtype & SHADOW) |
| 208 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
| 209 |
|
return; /* no scattering */ |
| 210 |
< |
setcolor(ca, r->albedo*colval(ambval,RED)*(1.-colval(ce,RED)), |
| 211 |
< |
r->albedo*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
| 212 |
< |
r->albedo*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
| 210 |
> |
setcolor(ca, |
| 211 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
| 212 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
| 213 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
| 214 |
|
addcolor(r->rcol, ca); /* ambient in scattering */ |
| 215 |
|
srcscatter(r); /* source in scattering */ |
| 216 |
|
} |
