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#include "source.h" |
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#include "otypes.h" |
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#include "otspecial.h" |
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#include "random.h" |
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|
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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unsigned long raynum = 0; /* next unique ray number */ |
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unsigned long nrays = 0; /* number of calls to localhit */ |
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> |
RNUMBER raynum = 0; /* next unique ray number */ |
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RNUMBER nrays = 0; /* number of calls to localhit */ |
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|
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static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
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OBJREC Lamb = { |
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OVOID, MAT_PLASTIC, "Lambertian", |
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{0, 5, NULL, Lambfa}, NULL, |
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{NULL, Lambfa, 0, 5}, NULL |
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}; /* a Lambertian surface */ |
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|
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OBJREC Aftplane; /* aft clipping plane object */ |
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r->crtype = r->rtype = rt; |
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r->rsrc = -1; |
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r->clipset = NULL; |
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r->revf = raytrace; |
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copycolor(r->cext, cextinction); |
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copycolor(r->albedo, salbedo); |
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r->gecc = seccg; |
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r->clipset = ro->newcset; |
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r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
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} |
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r->revf = ro->revf; |
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copycolor(r->cext, ro->cext); |
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copycolor(r->albedo, ro->albedo); |
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r->gecc = ro->gecc; |
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colval(ro->cext,RED) : colval(ro->cext,GRN); |
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if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
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re *= ro->rot; |
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if (re > .1) |
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r->rweight *= exp(-re); |
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if (re > 0.1) { |
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> |
if (re > 92.) { |
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r->rweight = 0.0; |
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> |
} else { |
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> |
r->rweight *= exp(-re); |
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} |
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} |
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} |
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rayclear(r); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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if (r->rweight <= 0.0) /* check for expiration */ |
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> |
return(-1); |
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> |
if (r->crtype & SHADOW) /* shadow commitment */ |
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> |
return(0); |
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> |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
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> |
if (minweight <= 0.0) |
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> |
error(USER, "zero ray weight in Russian roulette"); |
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if (maxdepth < 0 && r->rlvl > -maxdepth) |
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return(-1); /* upper reflection limit */ |
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if (r->rweight >= minweight) |
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return(0); |
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if (frandom() > r->rweight/minweight) |
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return(-1); |
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rw = minweight/r->rweight; /* promote survivor */ |
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scalecolor(r->rcoef, rw); |
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r->rweight = minweight; |
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return(0); |
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} |
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return(r->rlvl <= abs(maxdepth) && r->rweight >= minweight ? 0 : -1); |
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} |
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extern void |
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rayvalue( /* trace a ray and compute its value */ |
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raytrace( /* trace a ray and compute its value */ |
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RAY *r |
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) |
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{ |
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foremat = backmat = 0; |
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/* foreground */ |
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fr = *r; |
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< |
if (coef > FTINY) |
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> |
if (coef > FTINY) { |
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> |
fr.rweight *= coef; |
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> |
scalecolor(fr.rcoef, coef); |
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foremat = rayshade(&fr, fore); |
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} |
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/* background */ |
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br = *r; |
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if (coef < 1.0-FTINY) |
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if (coef < 1.0-FTINY) { |
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> |
br.rweight *= 1.0-coef; |
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> |
scalecolor(br.rcoef, 1.0-coef); |
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backmat = rayshade(&br, back); |
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} |
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/* check for transparency */ |
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if (backmat ^ foremat) { |
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if (backmat && coef > FTINY) |
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|
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extern void |
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raycontrib( /* compute (cumulative) ray contribution */ |
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< |
COLOR rc, |
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> |
double rc[3], |
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const RAY *r, |
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int flags |
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) |
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{ |
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< |
COLOR eext, ext1; |
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|
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setcolor(eext, 0., 0., 0.); |
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setcolor(rc, 1., 1., 1.); |
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> |
double eext[3]; |
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> |
int i; |
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|
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eext[0] = eext[1] = eext[2] = 0.; |
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rc[0] = rc[1] = rc[2] = 1.; |
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|
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while (r != NULL && r->crtype&flags) { |
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< |
multcolor(rc, r->rcoef); |
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< |
copycolor(ext1, r->cext); |
378 |
< |
scalecolor(ext1, r->rot); |
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< |
addcolor(eext, ext1); |
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> |
for (i = 3; i--; ) { |
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> |
rc[i] *= colval(r->rcoef,i); |
378 |
> |
eext[i] += r->rot * colval(r->cext,i); |
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> |
} |
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r = r->parent; |
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} |
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< |
if (intens(eext) > FTINY) { |
383 |
< |
setcolor(ext1, exp(-colval(eext,RED)), |
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< |
exp(-colval(eext,GRN)), |
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< |
exp(-colval(eext,BLU))); |
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< |
multcolor(rc, ext1); |
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< |
} |
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> |
for (i = 3; i--; ) |
383 |
> |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
384 |
> |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
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} |
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|
387 |
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|
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else if (r->rdir[i] < -1e-7) |
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sflags |= 0x10 << i; |
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} |
515 |
< |
if (sflags == 0) |
516 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
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> |
if (!sflags) { |
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> |
error(WARNING, "zero ray direction in localhit"); |
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> |
return(0); |
518 |
> |
} |
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/* start off assuming nothing hit */ |
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if (r->rmax > FTINY) { /* except aft plane if one */ |
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r->ro = &Aftplane; |
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r->rot = r->rmax; |
523 |
< |
for (i = 0; i < 3; i++) |
492 |
< |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
523 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
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} |
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/* find global cube entrance point */ |
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t = 0.0; |
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if (t >= r->rot) /* clipped already */ |
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return(0); |
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/* advance position */ |
546 |
< |
for (i = 0; i < 3; i++) |
516 |
< |
curpos[i] += r->rdir[i]*t; |
546 |
> |
VSUM(curpos, curpos, r->rdir, t); |
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|
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if (!incube(scene, curpos)) /* non-intersecting ray */ |
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return(0); |
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ax = 2; |
635 |
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} |
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} |
637 |
< |
pos[0] += r->rdir[0]*t; |
608 |
< |
pos[1] += r->rdir[1]*t; |
609 |
< |
pos[2] += r->rdir[2]*t; |
637 |
> |
VSUM(pos, pos, r->rdir, t); |
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return(ax); |
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} |
640 |
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