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#include "otspecial.h" |
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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extern CUBE thescene; /* our scene */ |
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extern int maxdepth; /* maximum recursion depth */ |
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extern double minweight; /* minimum ray weight */ |
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extern int do_irrad; /* compute irradiance? */ |
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long raynum = 0L; /* next unique ray number */ |
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long nrays = 0L; /* number of calls to localhit */ |
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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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static FLOAT 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, -1, |
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{0, 5, NULL, Lambfa}, NULL, |
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}; /* a Lambertian surface */ |
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static int raymove(), checkset(), checkhit(); |
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#define MAXLOOP 128 /* modifier loop detection */ |
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#define RAYHIT (-1) /* return value for intercepted ray */ |
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raycont(r) /* check for clipped object and continue */ |
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register RAY *r; |
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{ |
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if (r->clipset != NULL && inset(r->clipset, r->ro->omod)) |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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r->ro->omod == OVOID) |
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raytrans(r); |
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else |
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rayshade(r, r->ro->omod); |
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m = &Lamb; |
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} |
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(*ofun[m->otype].funp)(m, r); /* execute function */ |
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m->lastrno = r->rno; |
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if (ismaterial(m->otype)) { /* materials call raytexture */ |
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depth--; |
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return; /* we're done */ |
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error(USER, errmsg); |
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} |
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(*ofun[m->otype].funp)(m, r); |
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m->lastrno = r->rno; |
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} |
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depth--; /* end here */ |
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} |
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register RAY *r; |
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register CUBE *scene; |
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{ |
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OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
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FVECT curpos; /* current cube position */ |
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int sflags; /* sign flags */ |
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double t, dt; |
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sflags = 0; |
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for (i = 0; i < 3; i++) { |
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curpos[i] = r->rorg[i]; |
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if (r->rdir[i] > FTINY) |
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if (r->rdir[i] > 1e-7) |
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sflags |= 1 << i; |
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else if (r->rdir[i] < -FTINY) |
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else if (r->rdir[i] < -1e-7) |
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sflags |= 0x10 << i; |
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} |
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if (sflags == 0) |
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if (!incube(scene, curpos)) /* non-intersecting ray */ |
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return(0); |
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} |
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return(raymove(curpos, sflags, r, scene) == RAYHIT); |
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cxset[0] = 0; |
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return(raymove(curpos, cxset, sflags, r, scene) == RAYHIT); |
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} |
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static int |
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raymove(pos, dirf, r, cu) /* check for hit as we move */ |
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FVECT pos; /* modified */ |
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raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
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FVECT pos; /* current position, modified herein */ |
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OBJECT *cxs; /* checked objects, modified by checkhit */ |
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int dirf; /* direction indicators to speed tests */ |
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register RAY *r; |
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register CUBE *cu; |
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} |
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for ( ; ; ) { |
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cukid.cutree = octkid(cu->cutree, br); |
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if ((ax = raymove(pos,dirf,r,&cukid)) == RAYHIT) |
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if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
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return(RAYHIT); |
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sgn = 1 << ax; |
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if (sgn & dirf) /* positive axis? */ |
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} |
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/*NOTREACHED*/ |
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} |
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if (isfull(cu->cutree) && checkhit(r, cu)) |
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> |
if (isfull(cu->cutree) && checkhit(r, cu, cxs)) |
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return(RAYHIT); |
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/* advance to next cube */ |
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if (dirf&0x11) { |
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static |
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checkhit(r, cu) /* check for hit in full cube */ |
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checkhit(r, cu, cxs) /* check for hit in full cube */ |
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register RAY *r; |
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CUBE *cu; |
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OBJECT *cxs; |
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{ |
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OBJECT oset[MAXSET+1]; |
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register OBJREC *o; |
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register int i; |
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objset(oset, cu->cutree); |
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checkset(oset, cxs); /* eliminate double-checking */ |
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for (i = oset[0]; i > 0; i--) { |
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o = objptr(oset[i]); |
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if (o->lastrno == r->rno) /* checked already? */ |
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continue; |
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(*ofun[o->otype].funp)(o, r); |
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o->lastrno = r->rno; |
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} |
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if (r->ro == NULL) |
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return(0); /* no scores yet */ |
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return(incube(cu, r->rop)); /* hit OK if in current cube */ |
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} |
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static |
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checkset(os, cs) /* modify checked set and set to check */ |
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register OBJECT *os; /* os' = os - cs */ |
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register OBJECT *cs; /* cs' = cs + os */ |
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{ |
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OBJECT cset[MAXCSET+MAXSET+1]; |
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register int i, j; |
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int k; |
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/* copy os in place, cset <- cs */ |
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cset[0] = 0; |
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k = 0; |
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for (i = j = 1; i <= os[0]; i++) { |
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while (j <= cs[0] && cs[j] < os[i]) |
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cset[++cset[0]] = cs[j++]; |
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if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
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os[++k] = os[i]; |
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cset[++cset[0]] = os[i]; |
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} |
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} |
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if (!(os[0] = k)) /* new "to check" set size */ |
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return; /* special case */ |
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while (j <= cs[0]) /* get the rest of cs */ |
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cset[++cset[0]] = cs[j++]; |
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if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
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cset[0] = MAXCSET; |
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/* setcopy(cs, cset); */ /* copy cset back to cs */ |
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os = cset; |
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for (i = os[0]; i-- >= 0; ) |
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*cs++ = *os++; |
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} |
