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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#include "otypes.h" |
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#include "otspecial.h" |
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|
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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|
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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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|
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long nrays = 0L; /* number of rays traced */ |
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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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|
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#define MAXLOOP 1024 /* modifier loop detection */ |
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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, |
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}; /* a Lambertian surface */ |
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|
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static int raymove(), checkset(), checkhit(); |
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|
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#define MAXLOOP 128 /* modifier loop detection */ |
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|
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#define RAYHIT (-1) /* return value for intercepted ray */ |
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|
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|
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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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} else { /* spawned ray */ |
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r->rlvl = ro->rlvl; |
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if (rt & RAYREFL) { |
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r->rsrc = ro->rsrc; |
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r->clipset = ro->newcset; |
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} |
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r->revf = ro->revf; |
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r->rweight = ro->rweight * rw; |
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r->crtype = ro->crtype | (r->rtype = rt); |
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VCOPY(r->rorg, ro->rop); |
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} |
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r->rno = nrays; |
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rayclear(r); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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} |
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|
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|
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rayclear(r) /* clear a ray for (re)evaluation */ |
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register RAY *r; |
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{ |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
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r->ro = NULL; |
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r->rot = FHUGE; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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setcolor(r->pcol, 1.0, 1.0, 1.0); |
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setcolor(r->rcol, 0.0, 0.0, 0.0); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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r->rt = 0.0; |
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} |
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rayvalue(r) /* compute a ray's value */ |
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register RAY *r; |
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raytrace(r) /* trace a ray and compute its value */ |
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RAY *r; |
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{ |
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extern int (*trace)(); |
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|
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if (localhit(r, &thescene) || sourcehit(r)) |
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if (localhit(r, &thescene)) |
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raycont(r); |
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else if (sourcehit(r)) |
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rayshade(r, r->ro->omod); |
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if (trace != NULL) |
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} |
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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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raytrans(r); |
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else |
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rayshade(r, r->ro->omod); |
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} |
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|
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|
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raytrans(r) /* transmit ray as is */ |
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RAY *r; |
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register RAY *r; |
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{ |
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RAY tr; |
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VCOPY(tr.rdir, r->rdir); |
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rayvalue(&tr); |
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copycolor(r->rcol, tr.rcol); |
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r->rt = r->rot + tr.rt; |
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} |
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} |
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{ |
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static int depth = 0; |
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register OBJREC *m; |
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/* check for clipped surface */ |
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if (r->clipset != NULL && r->rot < FHUGE && |
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inset(r->clipset, mod)) { |
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raytrans(r); |
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return; |
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} |
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/* check for infinite loop */ |
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if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "possible modifier loop"); |
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r->rt = r->rot; /* set effective ray length */ |
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for ( ; mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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/****** unnecessary test since modifier() is always called |
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error(USER, errmsg); |
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} |
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******/ |
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/* hack for irradiance calculation */ |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
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if (irr_ignore(m->otype)) { |
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depth--; |
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raytrans(r); |
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return; |
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} |
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if (!islight(m->otype)) |
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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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* still fraught with problems since reflected rays and similar |
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* directions calculated from the surface normal may spawn rays behind |
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* the surface. The only solution is to curb textures at high |
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* incidence (Rdot << 1). |
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* incidence (namely, keep DOT(rdir,pert) < Rdot). |
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*/ |
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|
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for (i = 0; i < 3; i++) |
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} |
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newrayxf(r) /* get new tranformation matrix for ray */ |
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RAY *r; |
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{ |
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static struct xfn { |
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struct xfn *next; |
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FULLXF xf; |
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} xfseed = { &xfseed }, *xflast = &xfseed; |
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register struct xfn *xp; |
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register RAY *rp; |
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|
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/* |
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* Search for transform in circular list that |
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* has no associated ray in the tree. |
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*/ |
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xp = xflast; |
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for (rp = r->parent; rp != NULL; rp = rp->parent) |
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if (rp->rox == &xp->xf) { /* xp in use */ |
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xp = xp->next; /* move to next */ |
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if (xp == xflast) { /* need new one */ |
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xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
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if (xp == NULL) |
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error(SYSTEM, |
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"out of memory in newrayxf"); |
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/* insert in list */ |
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xp->next = xflast->next; |
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xflast->next = xp; |
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break; /* we're done */ |
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} |
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rp = r; /* start check over */ |
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} |
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/* got it */ |
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r->rox = &xp->xf; |
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xflast = xp; |
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} |
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|
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|
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flipsurface(r) /* reverse surface orientation */ |
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register RAY *r; |
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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 mpos, mneg; /* sign flags */ |
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int sflags; /* sign flags */ |
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double t, dt; |
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register int i; |
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nrays++; /* increment trace counter */ |
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mpos = mneg = 0; |
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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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mpos |= 1 << i; |
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sflags |= 1 << i; |
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else if (r->rdir[i] < -FTINY) |
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mneg |= 1 << i; |
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sflags |= 0x10 << i; |
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} |
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if (sflags == 0) |
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error(CONSISTENCY, "zero ray direction in localhit"); |
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t = 0.0; |
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if (!incube(scene, curpos)) { |
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/* find distance to entry */ |
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for (i = 0; i < 3; i++) { |
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/* plane in our direction */ |
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if (mpos & 1<<i) |
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if (sflags & 1<<i) |
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dt = scene->cuorg[i]; |
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else if (mneg & 1<<i) |
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else if (sflags & 0x10<<i) |
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dt = scene->cuorg[i] + scene->cusize; |
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else |
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continue; |
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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, mpos, mneg, 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, plus, minus, r, cu) /* check for hit as we move */ |
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FVECT pos; /* modified */ |
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int plus, minus; /* direction indicators to speed tests */ |
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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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int ax; |
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double dt, t; |
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register int sgn; |
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|
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if (istree(cu->cutree)) { /* recurse on subcubes */ |
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CUBE cukid; |
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register int br; |
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register int br, sgn; |
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|
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cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
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VCOPY(cukid.cuorg, cu->cuorg); |
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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,plus,minus,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 & minus) /* negative axis? */ |
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if (sgn & br) { |
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cukid.cuorg[ax] -= cukid.cusize; |
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br &= ~sgn; |
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} else |
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return(ax); /* underflow */ |
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else |
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if (sgn & dirf) /* positive axis? */ |
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if (sgn & br) |
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return(ax); /* overflow */ |
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else { |
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cukid.cuorg[ax] += cukid.cusize; |
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br |= sgn; |
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} |
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else |
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if (sgn & br) { |
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cukid.cuorg[ax] -= cukid.cusize; |
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br &= ~sgn; |
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} else |
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return(ax); /* underflow */ |
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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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sgn = plus | minus; |
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if (sgn&1) { |
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dt = plus&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
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if (dirf&0x11) { |
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dt = dirf&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
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t = (dt - pos[0])/r->rdir[0]; |
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ax = 0; |
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} else |
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t = FHUGE; |
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if (sgn&2) { |
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dt = plus&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
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> |
if (dirf&0x22) { |
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> |
dt = dirf&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
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dt = (dt - pos[1])/r->rdir[1]; |
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if (dt < t) { |
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t = dt; |
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ax = 1; |
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} |
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} |
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if (sgn&4) { |
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< |
dt = plus&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
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> |
if (dirf&0x44) { |
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> |
dt = dirf&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
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dt = (dt - pos[2])/r->rdir[2]; |
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if (dt < t) { |
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t = dt; |
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|
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|
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static |
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< |
checkhit(r, cu) /* check for hit in full cube */ |
| 453 |
> |
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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|
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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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> |
if (o->omod == OVOID && issurface(o->otype)) |
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> |
continue; /* ignore void surfaces */ |
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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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|
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return(incube(cu, r->rop)); /* hit OK if in current cube */ |
| 474 |
+ |
} |
| 475 |
+ |
|
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+ |
|
| 477 |
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static |
| 478 |
+ |
checkset(os, cs) /* modify checked set and set to check */ |
| 479 |
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register OBJECT *os; /* os' = os - cs */ |
| 480 |
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register OBJECT *cs; /* cs' = cs + os */ |
| 481 |
+ |
{ |
| 482 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
| 483 |
+ |
register int i, j; |
| 484 |
+ |
int k; |
| 485 |
+ |
/* copy os in place, cset <- cs */ |
| 486 |
+ |
cset[0] = 0; |
| 487 |
+ |
k = 0; |
| 488 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
| 489 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
| 490 |
+ |
cset[++cset[0]] = cs[j++]; |
| 491 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
| 492 |
+ |
os[++k] = os[i]; |
| 493 |
+ |
cset[++cset[0]] = os[i]; |
| 494 |
+ |
} |
| 495 |
+ |
} |
| 496 |
+ |
if (!(os[0] = k)) /* new "to check" set size */ |
| 497 |
+ |
return; /* special case */ |
| 498 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
| 499 |
+ |
cset[++cset[0]] = cs[j++]; |
| 500 |
+ |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
| 501 |
+ |
cset[0] = MAXCSET; |
| 502 |
+ |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
| 503 |
+ |
os = cset; |
| 504 |
+ |
for (i = os[0]; i-- >= 0; ) |
| 505 |
+ |
*cs++ = *os++; |
| 506 |
|
} |