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/* Copyright (c) 1986 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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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* raytrace.c - routines for tracing and shading rays. |
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* |
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* 8/7/85 |
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* External symbols declared in ray.h |
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*/ |
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#include "ray.h" |
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#include "copyright.h" |
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|
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#include "octree.h" |
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|
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#include "ray.h" |
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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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#include "pmap.h" |
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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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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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|
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long nrays = 0L; /* number of rays traced */ |
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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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#define MAXLOOP 32 /* modifier loop detection */ |
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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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{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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|
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#define RAYHIT (-1) /* return value for intercepted ray */ |
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|
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static int raymove(FVECT pos, OBJECT *cxs, int dirf, RAY *r, CUBE *cu); |
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static int checkhit(RAY *r, CUBE *cu, OBJECT *cxs); |
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static void checkset(OBJECT *os, OBJECT *cs); |
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|
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rayorigin(r, ro, rt, rw) /* start new ray from old one */ |
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register RAY *r, *ro; |
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int rt; |
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double rw; |
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|
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int |
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rayorigin( /* start new ray from old one */ |
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RAY *r, |
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int rt, |
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const RAY *ro, |
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const COLOR rc |
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) |
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{ |
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double rw, re; |
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/* assign coefficient/weight */ |
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if (rc == NULL) { |
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rw = 1.0; |
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setcolor(r->rcoef, 1., 1., 1.); |
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} else { |
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rw = intens(rc); |
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if (rw > 1.0) |
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rw = 1.0; /* avoid calculation growth */ |
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if (rc != r->rcoef) |
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copycolor(r->rcoef, rc); |
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} |
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if ((r->parent = ro) == NULL) { /* primary ray */ |
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r->rlvl = 0; |
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r->rweight = rw; |
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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->slights = NULL; |
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} else { /* spawned ray */ |
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if (ro->rot >= FHUGE*.99) { |
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memset(r, 0, sizeof(RAY)); |
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return(-1); /* illegal continuation */ |
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} |
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r->rlvl = ro->rlvl; |
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if (rt & RAYREFL) { |
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r->rlvl++; |
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r->rsrc = -1; |
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r->clipset = ro->clipset; |
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r->rmax = 0.0; |
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} else { |
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r->rsrc = ro->rsrc; |
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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->rweight = ro->rweight * rw; |
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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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r->slights = ro->slights; |
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r->crtype = ro->crtype | (r->rtype = rt); |
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VCOPY(r->rorg, ro->rop); |
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r->rweight = ro->rweight * rw; |
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/* estimate extinction */ |
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re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
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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 > 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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r->rno = nrays; |
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rayclear(r); |
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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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/* ambient in photon map? */ |
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if (ro != NULL && ro->crtype & AMBIENT) { |
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if (causticPhotonMapping) |
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return(-1); |
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if (photonMapping && rt != TRANS) |
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return(-1); |
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} |
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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->rweight >= minweight) & (r->rlvl <= abs(maxdepth)) ? 0 : -1); |
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} |
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|
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|
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void |
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rayclear( /* clear a ray for (re)evaluation */ |
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RAY *r |
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) |
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{ |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
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r->hitf = rayhit; |
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r->robj = OVOID; |
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r->ro = NULL; |
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r->rot = FHUGE; |
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r->rofs = 1.0; setident4(r->rofx); |
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r->robs = 1.0; setident4(r->robx); |
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r->rox = NULL; |
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r->rxt = r->rmt = r->rot = FHUGE; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->rflips = 0; |
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r->uv[0] = r->uv[1] = 0.0; |
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setcolor(r->pcol, 1.0, 1.0, 1.0); |
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setcolor(r->mcol, 0.0, 0.0, 0.0); |
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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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} |
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|
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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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void |
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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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extern int (*trace)(); |
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|
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if (localhit(r, &thescene)) |
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if (r->clipset != NULL && inset(r->clipset, r->ro->omod)) |
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raytrans(r); /* object is clipped */ |
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else |
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rayshade(r, r->ro->omod); |
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else if (sourcehit(r)) |
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rayshade(r, r->ro->omod); |
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raycont(r); /* hit local surface, evaluate */ |
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else if (r->ro == &Aftplane) { |
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r->ro = NULL; /* hit aft clipping plane */ |
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r->rot = FHUGE; |
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} else if (sourcehit(r)) |
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rayshade(r, r->ro->omod); /* distant source */ |
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|
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if (trace != NULL) |
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(*trace)(r); /* trace execution */ |
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|
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rayparticipate(r); /* for participating medium */ |
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} |
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raytrans(r) /* transmit ray as is */ |
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RAY *r; |
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void |
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raycont( /* check for clipped object and continue */ |
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RAY *r |
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) |
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{ |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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!rayshade(r, r->ro->omod)) |
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raytrans(r); |
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} |
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|
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|
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void |
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raytrans( /* transmit ray as is */ |
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RAY *r |
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) |
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{ |
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RAY tr; |
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|
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if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
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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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rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
197 |
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VCOPY(tr.rdir, r->rdir); |
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rayvalue(&tr); |
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copycolor(r->mcol, tr.mcol); |
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copycolor(r->rcol, tr.rcol); |
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r->rmt = r->rot + tr.rmt; |
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r->rxt = r->rot + tr.rxt; |
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} |
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|
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|
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int |
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raytirrad( /* irradiance hack */ |
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OBJREC *m, |
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RAY *r |
210 |
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) |
211 |
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{ |
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if (ofun[m->otype].flags & (T_M|T_X) && m->otype != MAT_CLIP) { |
213 |
> |
if (istransp(m->otype) || isBSDFproxy(m)) { |
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raytrans(r); |
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return(1); |
216 |
> |
} |
217 |
> |
if (!islight(m->otype)) |
218 |
> |
return((*ofun[Lamb.otype].funp)(&Lamb, r)); |
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} |
220 |
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return(0); /* not a qualifying surface */ |
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} |
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|
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|
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< |
rayshade(r, mod) /* shade ray r with material mod */ |
225 |
< |
register RAY *r; |
226 |
< |
int mod; |
224 |
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int |
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rayshade( /* shade ray r with material mod */ |
226 |
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RAY *r, |
227 |
> |
int mod |
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) |
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{ |
230 |
< |
static int depth = 0; |
231 |
< |
register OBJREC *m; |
232 |
< |
/* check for infinite loop */ |
233 |
< |
if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "material loop"); |
230 |
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int tst_irrad = do_irrad && !(r->crtype & ~(PRIMARY|TRANS)); |
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OBJREC *m; |
232 |
> |
|
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r->rxt = r->rot; /* preset effective ray length */ |
234 |
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for ( ; mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
236 |
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/****** unnecessary test since modifier() is always called |
237 |
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if (!ismodifier(m->otype)) { |
238 |
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sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
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error(USER, errmsg); |
240 |
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} |
241 |
< |
(*ofun[m->otype].funp)(m, r); /* execute function */ |
242 |
< |
m->lastrno = r->rno; |
243 |
< |
if (ismaterial(m->otype)) { /* materials call raytexture */ |
244 |
< |
depth--; |
245 |
< |
return; /* we're done */ |
246 |
< |
} |
241 |
> |
******/ |
242 |
> |
/* hack for irradiance calculation */ |
243 |
> |
if (tst_irrad && raytirrad(m, r)) |
244 |
> |
return(1); |
245 |
> |
|
246 |
> |
if ((*ofun[m->otype].funp)(m, r)) |
247 |
> |
return(1); /* materials call raytexture() */ |
248 |
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} |
249 |
< |
objerror(r->ro, USER, "material not found"); |
249 |
> |
return(0); /* no material! */ |
250 |
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} |
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|
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|
253 |
< |
raytexture(r, mod) /* get material modifiers */ |
254 |
< |
RAY *r; |
255 |
< |
int mod; |
253 |
> |
void |
254 |
> |
rayparticipate( /* compute ray medium participation */ |
255 |
> |
RAY *r |
256 |
> |
) |
257 |
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{ |
258 |
< |
static int depth = 0; |
259 |
< |
register OBJREC *m; |
260 |
< |
/* check for infinite loop */ |
261 |
< |
if (depth++ >= MAXLOOP) |
262 |
< |
objerror(r->ro, USER, "modifier loop"); |
258 |
> |
COLOR ce, ca; |
259 |
> |
double re, ge, be; |
260 |
> |
|
261 |
> |
if (intens(r->cext) <= 1./FHUGE) |
262 |
> |
return; /* no medium */ |
263 |
> |
re = r->rot*colval(r->cext,RED); |
264 |
> |
ge = r->rot*colval(r->cext,GRN); |
265 |
> |
be = r->rot*colval(r->cext,BLU); |
266 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
267 |
> |
re *= 1. - colval(r->albedo,RED); |
268 |
> |
ge *= 1. - colval(r->albedo,GRN); |
269 |
> |
be *= 1. - colval(r->albedo,BLU); |
270 |
> |
} |
271 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
272 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
273 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
274 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
275 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
276 |
> |
return; /* no scattering */ |
277 |
> |
|
278 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
279 |
> |
if (!volumePhotonMapping) { |
280 |
> |
setcolor(ca, |
281 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
282 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
283 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
284 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
285 |
> |
} |
286 |
> |
|
287 |
> |
srcscatter(r); /* source in scattering */ |
288 |
> |
} |
289 |
> |
|
290 |
> |
|
291 |
> |
void |
292 |
> |
raytexture( /* get material modifiers */ |
293 |
> |
RAY *r, |
294 |
> |
OBJECT mod |
295 |
> |
) |
296 |
> |
{ |
297 |
> |
OBJREC *m; |
298 |
|
/* execute textures and patterns */ |
299 |
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for ( ; mod != OVOID; mod = m->omod) { |
300 |
|
m = objptr(mod); |
301 |
< |
if (!istexture(m->otype)) { |
301 |
> |
/****** unnecessary test since modifier() is always called |
302 |
> |
if (!ismodifier(m->otype)) { |
303 |
|
sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
304 |
|
error(USER, errmsg); |
305 |
|
} |
306 |
< |
(*ofun[m->otype].funp)(m, r); |
307 |
< |
m->lastrno = r->rno; |
306 |
> |
******/ |
307 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
308 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
309 |
> |
m->oname); |
310 |
> |
objerror(r->ro, USER, errmsg); |
311 |
> |
} |
312 |
|
} |
144 |
– |
depth--; /* end here */ |
313 |
|
} |
314 |
|
|
315 |
|
|
316 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
317 |
< |
register RAY *r; |
318 |
< |
OBJECT fore, back; |
319 |
< |
double coef; |
316 |
> |
int |
317 |
> |
raymixture( /* mix modifiers */ |
318 |
> |
RAY *r, |
319 |
> |
OBJECT fore, |
320 |
> |
OBJECT back, |
321 |
> |
double coef |
322 |
> |
) |
323 |
|
{ |
324 |
< |
FVECT curpert, forepert, backpert; |
325 |
< |
COLOR curpcol, forepcol, backpcol; |
326 |
< |
register int i; |
327 |
< |
/* clip coefficient */ |
324 |
> |
RAY fr, br; |
325 |
> |
double mfore, mback; |
326 |
> |
int foremat, backmat; |
327 |
> |
int i; |
328 |
> |
/* bound coefficient */ |
329 |
|
if (coef > 1.0) |
330 |
|
coef = 1.0; |
331 |
|
else if (coef < 0.0) |
332 |
|
coef = 0.0; |
333 |
< |
/* save current mods */ |
334 |
< |
VCOPY(curpert, r->pert); |
335 |
< |
copycolor(curpcol, r->pcol); |
336 |
< |
/* compute new mods */ |
337 |
< |
/* foreground */ |
338 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
339 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
340 |
< |
if (fore != OVOID && coef > FTINY) |
341 |
< |
raytexture(r, fore); |
342 |
< |
VCOPY(forepert, r->pert); |
343 |
< |
copycolor(forepcol, r->pcol); |
344 |
< |
/* background */ |
345 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
346 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
347 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
348 |
< |
raytexture(r, back); |
349 |
< |
VCOPY(backpert, r->pert); |
350 |
< |
copycolor(backpcol, r->pcol); |
351 |
< |
/* sum perturbations */ |
333 |
> |
/* compute foreground and background */ |
334 |
> |
foremat = backmat = 0; |
335 |
> |
/* foreground */ |
336 |
> |
fr = *r; |
337 |
> |
if (coef > FTINY) { |
338 |
> |
fr.rweight *= coef; |
339 |
> |
scalecolor(fr.rcoef, coef); |
340 |
> |
foremat = rayshade(&fr, fore); |
341 |
> |
} |
342 |
> |
/* background */ |
343 |
> |
br = *r; |
344 |
> |
if (coef < 1.0-FTINY) { |
345 |
> |
br.rweight *= 1.0-coef; |
346 |
> |
scalecolor(br.rcoef, 1.0-coef); |
347 |
> |
backmat = rayshade(&br, back); |
348 |
> |
} |
349 |
> |
/* check for transparency */ |
350 |
> |
if (backmat ^ foremat) { |
351 |
> |
if (backmat && coef > FTINY) |
352 |
> |
raytrans(&fr); |
353 |
> |
else if (foremat && coef < 1.0-FTINY) |
354 |
> |
raytrans(&br); |
355 |
> |
} |
356 |
> |
/* mix perturbations */ |
357 |
|
for (i = 0; i < 3; i++) |
358 |
< |
r->pert[i] = curpert[i] + coef*forepert[i] + |
359 |
< |
(1.0-coef)*backpert[i]; |
360 |
< |
/* multiply colors */ |
361 |
< |
setcolor(r->pcol, coef*colval(forepcol,RED) + |
362 |
< |
(1.0-coef)*colval(backpcol,RED), |
363 |
< |
coef*colval(forepcol,GRN) + |
364 |
< |
(1.0-coef)*colval(backpcol,GRN), |
365 |
< |
coef*colval(forepcol,BLU) + |
366 |
< |
(1.0-coef)*colval(backpcol,BLU)); |
367 |
< |
multcolor(r->pcol, curpcol); |
358 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
359 |
> |
/* mix pattern colors */ |
360 |
> |
scalecolor(fr.pcol, coef); |
361 |
> |
scalecolor(br.pcol, 1.0-coef); |
362 |
> |
copycolor(r->pcol, fr.pcol); |
363 |
> |
addcolor(r->pcol, br.pcol); |
364 |
> |
/* return value tells if material */ |
365 |
> |
if (!foremat & !backmat) |
366 |
> |
return(0); |
367 |
> |
/* mix returned ray values */ |
368 |
> |
scalecolor(fr.rcol, coef); |
369 |
> |
scalecolor(br.rcol, 1.0-coef); |
370 |
> |
copycolor(r->rcol, fr.rcol); |
371 |
> |
addcolor(r->rcol, br.rcol); |
372 |
> |
scalecolor(fr.mcol, coef); |
373 |
> |
scalecolor(br.mcol, 1.0-coef); |
374 |
> |
copycolor(r->mcol, fr.mcol); |
375 |
> |
addcolor(r->mcol, br.mcol); |
376 |
> |
mfore = bright(fr.mcol); mback = bright(br.mcol); |
377 |
> |
r->rmt = mfore > mback ? fr.rmt : br.rmt; |
378 |
> |
r->rxt = bright(fr.rcol)-mfore > bright(br.rcol)-mback ? |
379 |
> |
fr.rxt : br.rxt; |
380 |
> |
return(1); |
381 |
|
} |
382 |
|
|
383 |
|
|
384 |
|
double |
385 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
386 |
< |
FVECT norm; |
387 |
< |
register RAY *r; |
385 |
> |
raydist( /* compute (cumulative) ray distance */ |
386 |
> |
const RAY *r, |
387 |
> |
int flags |
388 |
> |
) |
389 |
|
{ |
390 |
+ |
double sum = 0.0; |
391 |
+ |
|
392 |
+ |
while (r != NULL && r->crtype&flags) { |
393 |
+ |
sum += r->rot; |
394 |
+ |
r = r->parent; |
395 |
+ |
} |
396 |
+ |
return(sum); |
397 |
+ |
} |
398 |
+ |
|
399 |
+ |
|
400 |
+ |
void |
401 |
+ |
raycontrib( /* compute (cumulative) ray contribution */ |
402 |
+ |
RREAL rc[3], |
403 |
+ |
const RAY *r, |
404 |
+ |
int flags |
405 |
+ |
) |
406 |
+ |
{ |
407 |
+ |
static int warnedPM = 0; |
408 |
+ |
|
409 |
+ |
rc[0] = rc[1] = rc[2] = 1.; |
410 |
+ |
|
411 |
+ |
while (r != NULL && r->crtype&flags) { |
412 |
+ |
int i = 3; |
413 |
+ |
while (i--) |
414 |
+ |
rc[i] *= colval(r->rcoef,i); |
415 |
+ |
/* check for participating medium */ |
416 |
+ |
if (!warnedPM && (bright(r->cext) > FTINY) | |
417 |
+ |
(bright(r->albedo) > FTINY)) { |
418 |
+ |
error(WARNING, |
419 |
+ |
"ray contribution calculation does not support participating media"); |
420 |
+ |
warnedPM++; |
421 |
+ |
} |
422 |
+ |
r = r->parent; |
423 |
+ |
} |
424 |
+ |
} |
425 |
+ |
|
426 |
+ |
|
427 |
+ |
double |
428 |
+ |
raynormal( /* compute perturbed normal for ray */ |
429 |
+ |
FVECT norm, |
430 |
+ |
RAY *r |
431 |
+ |
) |
432 |
+ |
{ |
433 |
|
double newdot; |
434 |
< |
register int i; |
434 |
> |
int i; |
435 |
|
|
436 |
|
/* The perturbation is added to the surface normal to obtain |
437 |
|
* the new normal. If the new normal would affect the surface |
439 |
|
* still fraught with problems since reflected rays and similar |
440 |
|
* directions calculated from the surface normal may spawn rays behind |
441 |
|
* the surface. The only solution is to curb textures at high |
442 |
< |
* incidence (Rdot << 1). |
442 |
> |
* incidence (namely, keep DOT(rdir,pert) < Rdot). |
443 |
|
*/ |
444 |
|
|
445 |
|
for (i = 0; i < 3; i++) |
460 |
|
} |
461 |
|
|
462 |
|
|
463 |
< |
flipsurface(r) /* reverse surface orientation */ |
464 |
< |
register RAY *r; |
463 |
> |
void |
464 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
465 |
> |
RAY *r |
466 |
> |
) |
467 |
|
{ |
468 |
+ |
static struct xfn { |
469 |
+ |
struct xfn *next; |
470 |
+ |
FULLXF xf; |
471 |
+ |
} xfseed = { &xfseed }, *xflast = &xfseed; |
472 |
+ |
struct xfn *xp; |
473 |
+ |
const RAY *rp; |
474 |
+ |
|
475 |
+ |
/* |
476 |
+ |
* Search for transform in circular list that |
477 |
+ |
* has no associated ray in the tree. |
478 |
+ |
*/ |
479 |
+ |
xp = xflast; |
480 |
+ |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
481 |
+ |
if (rp->rox == &xp->xf) { /* xp in use */ |
482 |
+ |
xp = xp->next; /* move to next */ |
483 |
+ |
if (xp == xflast) { /* need new one */ |
484 |
+ |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
485 |
+ |
if (xp == NULL) |
486 |
+ |
error(SYSTEM, |
487 |
+ |
"out of memory in newrayxf"); |
488 |
+ |
/* insert in list */ |
489 |
+ |
xp->next = xflast->next; |
490 |
+ |
xflast->next = xp; |
491 |
+ |
break; /* we're done */ |
492 |
+ |
} |
493 |
+ |
rp = r; /* start check over */ |
494 |
+ |
} |
495 |
+ |
/* got it */ |
496 |
+ |
r->rox = &xp->xf; |
497 |
+ |
xflast = xp; |
498 |
+ |
} |
499 |
+ |
|
500 |
+ |
|
501 |
+ |
void |
502 |
+ |
flipsurface( /* reverse surface orientation */ |
503 |
+ |
RAY *r |
504 |
+ |
) |
505 |
+ |
{ |
506 |
|
r->rod = -r->rod; |
507 |
|
r->ron[0] = -r->ron[0]; |
508 |
|
r->ron[1] = -r->ron[1]; |
510 |
|
r->pert[0] = -r->pert[0]; |
511 |
|
r->pert[1] = -r->pert[1]; |
512 |
|
r->pert[2] = -r->pert[2]; |
513 |
+ |
r->rflips++; |
514 |
|
} |
515 |
|
|
516 |
|
|
517 |
< |
localhit(r, scene) /* check for hit in the octree */ |
518 |
< |
register RAY *r; |
519 |
< |
register CUBE *scene; |
517 |
> |
void |
518 |
> |
rayhit( /* standard ray hit test */ |
519 |
> |
OBJECT *oset, |
520 |
> |
RAY *r |
521 |
> |
) |
522 |
|
{ |
523 |
+ |
OBJREC *o; |
524 |
+ |
int i; |
525 |
+ |
|
526 |
+ |
for (i = oset[0]; i > 0; i--) { |
527 |
+ |
o = objptr(oset[i]); |
528 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
529 |
+ |
r->robj = oset[i]; |
530 |
+ |
} |
531 |
+ |
} |
532 |
+ |
|
533 |
+ |
|
534 |
+ |
int |
535 |
+ |
localhit( /* check for hit in the octree */ |
536 |
+ |
RAY *r, |
537 |
+ |
CUBE *scene |
538 |
+ |
) |
539 |
+ |
{ |
540 |
+ |
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
541 |
|
FVECT curpos; /* current cube position */ |
542 |
< |
int mpos, mneg; /* sign flags */ |
542 |
> |
int sflags; /* sign flags */ |
543 |
|
double t, dt; |
544 |
< |
register int i; |
544 |
> |
int i; |
545 |
|
|
546 |
|
nrays++; /* increment trace counter */ |
547 |
< |
|
253 |
< |
mpos = mneg = 0; |
547 |
> |
sflags = 0; |
548 |
|
for (i = 0; i < 3; i++) { |
549 |
|
curpos[i] = r->rorg[i]; |
550 |
< |
if (r->rdir[i] > FTINY) |
551 |
< |
mpos |= 1 << i; |
552 |
< |
else if (r->rdir[i] < -FTINY) |
553 |
< |
mneg |= 1 << i; |
550 |
> |
if (r->rdir[i] > 1e-7) |
551 |
> |
sflags |= 1 << i; |
552 |
> |
else if (r->rdir[i] < -1e-7) |
553 |
> |
sflags |= 0x10 << i; |
554 |
|
} |
555 |
+ |
if (!sflags) { |
556 |
+ |
error(WARNING, "zero ray direction in localhit"); |
557 |
+ |
return(0); |
558 |
+ |
} |
559 |
+ |
/* start off assuming nothing hit */ |
560 |
+ |
if (r->rmax > FTINY) { /* except aft plane if one */ |
561 |
+ |
r->ro = &Aftplane; |
562 |
+ |
r->rot = r->rmax; |
563 |
+ |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
564 |
+ |
} |
565 |
+ |
/* find global cube entrance point */ |
566 |
|
t = 0.0; |
567 |
|
if (!incube(scene, curpos)) { |
568 |
|
/* find distance to entry */ |
569 |
|
for (i = 0; i < 3; i++) { |
570 |
|
/* plane in our direction */ |
571 |
< |
if (mpos & 1<<i) |
571 |
> |
if (sflags & 1<<i) |
572 |
|
dt = scene->cuorg[i]; |
573 |
< |
else if (mneg & 1<<i) |
573 |
> |
else if (sflags & 0x10<<i) |
574 |
|
dt = scene->cuorg[i] + scene->cusize; |
575 |
|
else |
576 |
|
continue; |
580 |
|
t = dt; /* farthest face is the one */ |
581 |
|
} |
582 |
|
t += FTINY; /* fudge to get inside cube */ |
583 |
+ |
if (t >= r->rot) /* clipped already */ |
584 |
+ |
return(0); |
585 |
|
/* advance position */ |
586 |
< |
for (i = 0; i < 3; i++) |
280 |
< |
curpos[i] += r->rdir[i]*t; |
586 |
> |
VSUM(curpos, curpos, r->rdir, t); |
587 |
|
|
588 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
589 |
|
return(0); |
590 |
|
} |
591 |
< |
return(raymove(curpos, mpos, mneg, r, scene) == RAYHIT); |
591 |
> |
cxset[0] = 0; |
592 |
> |
raymove(curpos, cxset, sflags, r, scene); |
593 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
594 |
|
} |
595 |
|
|
596 |
|
|
597 |
|
static int |
598 |
< |
raymove(pos, plus, minus, r, cu) /* check for hit as we move */ |
599 |
< |
FVECT pos; /* modified */ |
600 |
< |
int plus, minus; /* direction indicators to speed tests */ |
601 |
< |
register RAY *r; |
602 |
< |
register CUBE *cu; |
598 |
> |
raymove( /* check for hit as we move */ |
599 |
> |
FVECT pos, /* current position, modified herein */ |
600 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
601 |
> |
int dirf, /* direction indicators to speed tests */ |
602 |
> |
RAY *r, |
603 |
> |
CUBE *cu |
604 |
> |
) |
605 |
|
{ |
606 |
|
int ax; |
607 |
|
double dt, t; |
298 |
– |
register int sgn; |
608 |
|
|
609 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
610 |
|
CUBE cukid; |
611 |
< |
register int br; |
611 |
> |
int br, sgn; |
612 |
|
|
613 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
614 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
627 |
|
} |
628 |
|
for ( ; ; ) { |
629 |
|
cukid.cutree = octkid(cu->cutree, br); |
630 |
< |
if ((ax = raymove(pos,plus,minus,r,&cukid)) == RAYHIT) |
630 |
> |
if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
631 |
|
return(RAYHIT); |
632 |
|
sgn = 1 << ax; |
633 |
< |
if (sgn & minus) /* negative axis? */ |
325 |
< |
if (sgn & br) { |
326 |
< |
cukid.cuorg[ax] -= cukid.cusize; |
327 |
< |
br &= ~sgn; |
328 |
< |
} else |
329 |
< |
return(ax); /* underflow */ |
330 |
< |
else |
633 |
> |
if (sgn & dirf) /* positive axis? */ |
634 |
|
if (sgn & br) |
635 |
|
return(ax); /* overflow */ |
636 |
|
else { |
637 |
|
cukid.cuorg[ax] += cukid.cusize; |
638 |
|
br |= sgn; |
639 |
|
} |
640 |
+ |
else |
641 |
+ |
if (sgn & br) { |
642 |
+ |
cukid.cuorg[ax] -= cukid.cusize; |
643 |
+ |
br &= ~sgn; |
644 |
+ |
} else |
645 |
+ |
return(ax); /* underflow */ |
646 |
|
} |
647 |
|
/*NOTREACHED*/ |
648 |
|
} |
649 |
< |
if (isfull(cu->cutree) && checkhit(r, cu)) |
649 |
> |
if (isfull(cu->cutree)) { |
650 |
> |
if (checkhit(r, cu, cxs)) |
651 |
> |
return(RAYHIT); |
652 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
653 |
|
return(RAYHIT); |
654 |
|
/* advance to next cube */ |
655 |
< |
sgn = plus | minus; |
656 |
< |
if (sgn&1) { |
345 |
< |
dt = plus&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
655 |
> |
if (dirf&0x11) { |
656 |
> |
dt = dirf&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
657 |
|
t = (dt - pos[0])/r->rdir[0]; |
658 |
|
ax = 0; |
659 |
|
} else |
660 |
|
t = FHUGE; |
661 |
< |
if (sgn&2) { |
662 |
< |
dt = plus&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
661 |
> |
if (dirf&0x22) { |
662 |
> |
dt = dirf&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
663 |
|
dt = (dt - pos[1])/r->rdir[1]; |
664 |
|
if (dt < t) { |
665 |
|
t = dt; |
666 |
|
ax = 1; |
667 |
|
} |
668 |
|
} |
669 |
< |
if (sgn&4) { |
670 |
< |
dt = plus&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
669 |
> |
if (dirf&0x44) { |
670 |
> |
dt = dirf&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
671 |
|
dt = (dt - pos[2])/r->rdir[2]; |
672 |
|
if (dt < t) { |
673 |
|
t = dt; |
674 |
|
ax = 2; |
675 |
|
} |
676 |
|
} |
677 |
< |
pos[0] += r->rdir[0]*t; |
367 |
< |
pos[1] += r->rdir[1]*t; |
368 |
< |
pos[2] += r->rdir[2]*t; |
677 |
> |
VSUM(pos, pos, r->rdir, t); |
678 |
|
return(ax); |
679 |
|
} |
680 |
|
|
681 |
|
|
682 |
< |
static |
683 |
< |
checkhit(r, cu) /* check for hit in full cube */ |
684 |
< |
register RAY *r; |
685 |
< |
CUBE *cu; |
682 |
> |
static int |
683 |
> |
checkhit( /* check for hit in full cube */ |
684 |
> |
RAY *r, |
685 |
> |
CUBE *cu, |
686 |
> |
OBJECT *cxs |
687 |
> |
) |
688 |
|
{ |
689 |
|
OBJECT oset[MAXSET+1]; |
379 |
– |
register OBJREC *o; |
380 |
– |
register int i; |
690 |
|
|
691 |
|
objset(oset, cu->cutree); |
692 |
< |
for (i = oset[0]; i > 0; i--) { |
693 |
< |
o = objptr(oset[i]); |
694 |
< |
if (o->lastrno == r->rno) /* checked already? */ |
695 |
< |
continue; |
696 |
< |
(*ofun[o->otype].funp)(o, r); |
388 |
< |
o->lastrno = r->rno; |
389 |
< |
} |
390 |
< |
if (r->ro == NULL) |
692 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
693 |
> |
|
694 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
695 |
> |
|
696 |
> |
if (r->robj == OVOID) |
697 |
|
return(0); /* no scores yet */ |
698 |
|
|
699 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
700 |
+ |
} |
701 |
+ |
|
702 |
+ |
|
703 |
+ |
static void |
704 |
+ |
checkset( /* modify checked set and set to check */ |
705 |
+ |
OBJECT *os, /* os' = os - cs */ |
706 |
+ |
OBJECT *cs /* cs' = cs + os */ |
707 |
+ |
) |
708 |
+ |
{ |
709 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
710 |
+ |
int i, j; |
711 |
+ |
int k; |
712 |
+ |
/* copy os in place, cset <- cs */ |
713 |
+ |
cset[0] = 0; |
714 |
+ |
k = 0; |
715 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
716 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
717 |
+ |
cset[++cset[0]] = cs[j++]; |
718 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
719 |
+ |
os[++k] = os[i]; |
720 |
+ |
cset[++cset[0]] = os[i]; |
721 |
+ |
} |
722 |
+ |
} |
723 |
+ |
if (!(os[0] = k)) /* new "to check" set size */ |
724 |
+ |
return; /* special case */ |
725 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
726 |
+ |
cset[++cset[0]] = cs[j++]; |
727 |
+ |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
728 |
+ |
cset[0] = MAXCSET; |
729 |
+ |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
730 |
+ |
os = cset; |
731 |
+ |
for (i = os[0]; i-- >= 0; ) |
732 |
+ |
*cs++ = *os++; |
733 |
|
} |