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/* Copyright (c) 1994 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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|
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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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|
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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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#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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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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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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|
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static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
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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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static OBJREC Aftplane; /* aft clipping plane object */ |
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OBJREC Aftplane; /* aft clipping plane object */ |
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|
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static int raymove(), checkset(), checkhit(); |
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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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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->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->revf = ro->revf; |
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r->rweight = ro->rweight * rw; |
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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->rmax = 0.0; |
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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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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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/* 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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rayclear(r) /* clear a ray for (re)evaluation */ |
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register RAY *r; |
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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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if (r->rmax > FTINY) { |
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r->ro = &Aftplane; |
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r->rot = r->rmax; |
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r->rop[0] = r->rorg[0] + r->rot*r->rdir[0]; |
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r->rop[1] = r->rorg[1] + r->rot*r->rdir[1]; |
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r->rop[2] = r->rorg[2] + r->rot*r->rdir[2]; |
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} else { |
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r->ro = NULL; |
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r->rot = FHUGE; |
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} |
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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->rox = NULL; |
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r->rxt = r->rmt = r->rot = FHUGE; |
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VCOPY(r->rop, r->rorg); |
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r->ron[0] = -r->rdir[0]; r->ron[1] = -r->rdir[1]; r->ron[2] = -r->rdir[2]; |
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r->rod = 1.0; |
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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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r->rt = 0.0; |
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} |
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raytrace(r) /* trace a ray and compute its value */ |
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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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int gotmat; |
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|
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if (localhit(r, &thescene)) |
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gotmat = raycont(r); |
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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; |
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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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gotmat = rayshade(r, r->ro->omod); |
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rayshade(r, r->ro->omod); /* distant source */ |
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|
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if (r->ro != NULL && !gotmat) |
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objerror(r->ro, USER, "material not found"); |
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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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|
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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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> |
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)) || |
| 187 |
< |
r->ro->omod == OVOID) { |
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> |
!rayshade(r, r->ro->omod)) |
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raytrans(r); |
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return(1); |
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} |
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return(rayshade(r, r->ro->omod)); |
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} |
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< |
raytrans(r) /* transmit ray as is */ |
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< |
register RAY *r; |
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> |
void |
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> |
raytrans( /* transmit ray as is */ |
| 194 |
> |
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) { |
| 200 |
< |
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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> |
rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
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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 |
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> |
) |
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> |
{ |
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> |
if (ofun[m->otype].flags & (T_M|T_X) && m->otype != MAT_CLIP) { |
| 216 |
> |
if (istransp(m->otype) || isBSDFproxy(m)) { |
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> |
raytrans(r); |
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> |
return(1); |
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> |
} |
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> |
if (!islight(m->otype)) |
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> |
return((*ofun[Lamb.otype].funp)(&Lamb, r)); |
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} |
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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 */ |
| 228 |
< |
register RAY *r; |
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< |
int mod; |
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> |
int |
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> |
rayshade( /* shade ray r with material mod */ |
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> |
RAY *r, |
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> |
int mod |
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> |
) |
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{ |
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< |
static int depth = 0; |
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< |
int gotmat; |
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< |
register OBJREC *m; |
| 236 |
< |
/* check for infinite loop */ |
| 237 |
< |
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 */ |
| 160 |
< |
for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
| 233 |
> |
int tst_irrad = do_irrad && !(r->crtype & ~(PRIMARY|TRANS)); |
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> |
OBJREC *m; |
| 235 |
> |
|
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> |
r->rxt = r->rot; /* preset effective ray length */ |
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> |
for ( ; mod != OVOID; mod = m->omod) { |
| 238 |
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m = objptr(mod); |
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/****** unnecessary test since modifier() is always called |
| 240 |
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if (!ismodifier(m->otype)) { |
| 243 |
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} |
| 244 |
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******/ |
| 245 |
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/* hack for irradiance calculation */ |
| 246 |
< |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
| 247 |
< |
if (irr_ignore(m->otype)) { |
| 248 |
< |
depth--; |
| 249 |
< |
raytrans(r); |
| 250 |
< |
return(1); |
| 174 |
< |
} |
| 175 |
< |
if (!islight(m->otype)) |
| 176 |
< |
m = &Lamb; |
| 177 |
< |
} |
| 178 |
< |
/* materials call raytexture */ |
| 179 |
< |
gotmat = (*ofun[m->otype].funp)(m, r); |
| 246 |
> |
if (tst_irrad && raytirrad(m, r)) |
| 247 |
> |
return(1); |
| 248 |
> |
|
| 249 |
> |
if ((*ofun[m->otype].funp)(m, r)) |
| 250 |
> |
return(1); /* materials call raytexture() */ |
| 251 |
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} |
| 252 |
< |
depth--; |
| 182 |
< |
return(gotmat); |
| 252 |
> |
return(0); /* no material! */ |
| 253 |
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} |
| 254 |
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|
| 255 |
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|
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< |
raytexture(r, mod) /* get material modifiers */ |
| 257 |
< |
RAY *r; |
| 258 |
< |
int mod; |
| 256 |
> |
void |
| 257 |
> |
rayparticipate( /* compute ray medium participation */ |
| 258 |
> |
RAY *r |
| 259 |
> |
) |
| 260 |
|
{ |
| 261 |
< |
static int depth = 0; |
| 262 |
< |
register OBJREC *m; |
| 263 |
< |
/* check for infinite loop */ |
| 264 |
< |
if (depth++ >= MAXLOOP) |
| 265 |
< |
objerror(r->ro, USER, "modifier loop"); |
| 261 |
> |
COLOR ce, ca; |
| 262 |
> |
double re, ge, be; |
| 263 |
> |
|
| 264 |
> |
if (intens(r->cext) <= 1./FHUGE) |
| 265 |
> |
return; /* no medium */ |
| 266 |
> |
re = r->rot*colval(r->cext,RED); |
| 267 |
> |
ge = r->rot*colval(r->cext,GRN); |
| 268 |
> |
be = r->rot*colval(r->cext,BLU); |
| 269 |
> |
if (r->crtype & SHADOW) { /* no scattering for sources */ |
| 270 |
> |
re *= 1. - colval(r->albedo,RED); |
| 271 |
> |
ge *= 1. - colval(r->albedo,GRN); |
| 272 |
> |
be *= 1. - colval(r->albedo,BLU); |
| 273 |
> |
} |
| 274 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
| 275 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
| 276 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
| 277 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
| 278 |
> |
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
| 279 |
> |
return; /* no scattering */ |
| 280 |
> |
|
| 281 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
| 282 |
> |
if (!volumePhotonMapping) { |
| 283 |
> |
setcolor(ca, |
| 284 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
| 285 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
| 286 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
| 287 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
| 288 |
> |
} |
| 289 |
> |
|
| 290 |
> |
srcscatter(r); /* source in scattering */ |
| 291 |
> |
} |
| 292 |
> |
|
| 293 |
> |
|
| 294 |
> |
void |
| 295 |
> |
raytexture( /* get material modifiers */ |
| 296 |
> |
RAY *r, |
| 297 |
> |
OBJECT mod |
| 298 |
> |
) |
| 299 |
> |
{ |
| 300 |
> |
OBJREC *m; |
| 301 |
|
/* execute textures and patterns */ |
| 302 |
|
for ( ; mod != OVOID; mod = m->omod) { |
| 303 |
|
m = objptr(mod); |
| 307 |
|
error(USER, errmsg); |
| 308 |
|
} |
| 309 |
|
******/ |
| 310 |
< |
if ((*ofun[m->otype].funp)(m, r)) |
| 311 |
< |
objerror(r->ro, USER, "conflicting materials"); |
| 310 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
| 311 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
| 312 |
> |
m->oname); |
| 313 |
> |
objerror(r->ro, USER, errmsg); |
| 314 |
> |
} |
| 315 |
|
} |
| 207 |
– |
depth--; /* end here */ |
| 316 |
|
} |
| 317 |
|
|
| 318 |
|
|
| 319 |
< |
raymixture(r, fore, back, coef) /* mix modifiers */ |
| 320 |
< |
register RAY *r; |
| 321 |
< |
OBJECT fore, back; |
| 322 |
< |
double coef; |
| 319 |
> |
int |
| 320 |
> |
raymixture( /* mix modifiers */ |
| 321 |
> |
RAY *r, |
| 322 |
> |
OBJECT fore, |
| 323 |
> |
OBJECT back, |
| 324 |
> |
double coef |
| 325 |
> |
) |
| 326 |
|
{ |
| 327 |
|
RAY fr, br; |
| 328 |
+ |
double mfore, mback; |
| 329 |
|
int foremat, backmat; |
| 330 |
< |
register int i; |
| 331 |
< |
/* clip coefficient */ |
| 330 |
> |
int i; |
| 331 |
> |
/* bound coefficient */ |
| 332 |
|
if (coef > 1.0) |
| 333 |
|
coef = 1.0; |
| 334 |
|
else if (coef < 0.0) |
| 335 |
|
coef = 0.0; |
| 336 |
|
/* compute foreground and background */ |
| 337 |
< |
foremat = backmat = -1; |
| 337 |
> |
foremat = backmat = 0; |
| 338 |
|
/* foreground */ |
| 339 |
< |
copystruct(&fr, r); |
| 340 |
< |
if (fore != OVOID && coef > FTINY) |
| 339 |
> |
fr = *r; |
| 340 |
> |
if (coef > FTINY) { |
| 341 |
> |
fr.rweight *= coef; |
| 342 |
> |
scalecolor(fr.rcoef, coef); |
| 343 |
|
foremat = rayshade(&fr, fore); |
| 344 |
+ |
} |
| 345 |
|
/* background */ |
| 346 |
< |
copystruct(&br, r); |
| 347 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
| 346 |
> |
br = *r; |
| 347 |
> |
if (coef < 1.0-FTINY) { |
| 348 |
> |
br.rweight *= 1.0-coef; |
| 349 |
> |
scalecolor(br.rcoef, 1.0-coef); |
| 350 |
|
backmat = rayshade(&br, back); |
| 351 |
< |
/* check */ |
| 352 |
< |
if (foremat < 0) |
| 353 |
< |
if (backmat < 0) |
| 354 |
< |
foremat = backmat = 0; |
| 355 |
< |
else |
| 356 |
< |
foremat = backmat; |
| 357 |
< |
else if (backmat < 0) |
| 358 |
< |
backmat = foremat; |
| 242 |
< |
if ((foremat==0) != (backmat==0)) |
| 243 |
< |
objerror(r->ro, USER, "mixing material with non-material"); |
| 351 |
> |
} |
| 352 |
> |
/* check for transparency */ |
| 353 |
> |
if (backmat ^ foremat) { |
| 354 |
> |
if (backmat && coef > FTINY) |
| 355 |
> |
raytrans(&fr); |
| 356 |
> |
else if (foremat && coef < 1.0-FTINY) |
| 357 |
> |
raytrans(&br); |
| 358 |
> |
} |
| 359 |
|
/* mix perturbations */ |
| 360 |
|
for (i = 0; i < 3; i++) |
| 361 |
|
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
| 364 |
|
scalecolor(br.pcol, 1.0-coef); |
| 365 |
|
copycolor(r->pcol, fr.pcol); |
| 366 |
|
addcolor(r->pcol, br.pcol); |
| 367 |
+ |
/* return value tells if material */ |
| 368 |
+ |
if (!foremat & !backmat) |
| 369 |
+ |
return(0); |
| 370 |
|
/* mix returned ray values */ |
| 371 |
< |
if (foremat) { |
| 372 |
< |
scalecolor(fr.rcol, coef); |
| 373 |
< |
scalecolor(br.rcol, 1.0-coef); |
| 374 |
< |
copycolor(r->rcol, fr.rcol); |
| 375 |
< |
addcolor(r->rcol, br.rcol); |
| 376 |
< |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
| 371 |
> |
scalecolor(fr.rcol, coef); |
| 372 |
> |
scalecolor(br.rcol, 1.0-coef); |
| 373 |
> |
copycolor(r->rcol, fr.rcol); |
| 374 |
> |
addcolor(r->rcol, br.rcol); |
| 375 |
> |
scalecolor(fr.mcol, coef); |
| 376 |
> |
scalecolor(br.mcol, 1.0-coef); |
| 377 |
> |
copycolor(r->mcol, fr.mcol); |
| 378 |
> |
addcolor(r->mcol, br.mcol); |
| 379 |
> |
mfore = bright(fr.mcol); mback = bright(br.mcol); |
| 380 |
> |
r->rmt = mfore > mback ? fr.rmt : br.rmt; |
| 381 |
> |
r->rxt = bright(fr.rcol)-mfore > bright(br.rcol)-mback ? |
| 382 |
> |
fr.rxt : br.rxt; |
| 383 |
> |
return(1); |
| 384 |
> |
} |
| 385 |
> |
|
| 386 |
> |
|
| 387 |
> |
double |
| 388 |
> |
raydist( /* compute (cumulative) ray distance */ |
| 389 |
> |
const RAY *r, |
| 390 |
> |
int flags |
| 391 |
> |
) |
| 392 |
> |
{ |
| 393 |
> |
double sum = 0.0; |
| 394 |
> |
|
| 395 |
> |
while (r != NULL && r->crtype&flags) { |
| 396 |
> |
sum += r->rot; |
| 397 |
> |
r = r->parent; |
| 398 |
|
} |
| 399 |
< |
/* return value tells if material */ |
| 261 |
< |
return(foremat); |
| 399 |
> |
return(sum); |
| 400 |
|
} |
| 401 |
|
|
| 402 |
|
|
| 403 |
+ |
void |
| 404 |
+ |
raycontrib( /* compute (cumulative) ray contribution */ |
| 405 |
+ |
RREAL rc[3], |
| 406 |
+ |
const RAY *r, |
| 407 |
+ |
int flags |
| 408 |
+ |
) |
| 409 |
+ |
{ |
| 410 |
+ |
static int warnedPM = 0; |
| 411 |
+ |
|
| 412 |
+ |
rc[0] = rc[1] = rc[2] = 1.; |
| 413 |
+ |
|
| 414 |
+ |
while (r != NULL && r->crtype&flags) { |
| 415 |
+ |
int i = 3; |
| 416 |
+ |
while (i--) |
| 417 |
+ |
rc[i] *= colval(r->rcoef,i); |
| 418 |
+ |
/* check for participating medium */ |
| 419 |
+ |
if (!warnedPM && (bright(r->cext) > FTINY) | |
| 420 |
+ |
(bright(r->albedo) > FTINY)) { |
| 421 |
+ |
error(WARNING, |
| 422 |
+ |
"ray contribution calculation does not support participating media"); |
| 423 |
+ |
warnedPM++; |
| 424 |
+ |
} |
| 425 |
+ |
r = r->parent; |
| 426 |
+ |
} |
| 427 |
+ |
} |
| 428 |
+ |
|
| 429 |
+ |
|
| 430 |
|
double |
| 431 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
| 432 |
< |
FVECT norm; |
| 433 |
< |
register RAY *r; |
| 431 |
> |
raynormal( /* compute perturbed normal for ray */ |
| 432 |
> |
FVECT norm, |
| 433 |
> |
RAY *r |
| 434 |
> |
) |
| 435 |
|
{ |
| 436 |
|
double newdot; |
| 437 |
< |
register int i; |
| 437 |
> |
int i; |
| 438 |
|
|
| 439 |
|
/* The perturbation is added to the surface normal to obtain |
| 440 |
|
* the new normal. If the new normal would affect the surface |
| 463 |
|
} |
| 464 |
|
|
| 465 |
|
|
| 466 |
< |
newrayxf(r) /* get new tranformation matrix for ray */ |
| 467 |
< |
RAY *r; |
| 466 |
> |
void |
| 467 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
| 468 |
> |
RAY *r |
| 469 |
> |
) |
| 470 |
|
{ |
| 471 |
|
static struct xfn { |
| 472 |
|
struct xfn *next; |
| 473 |
|
FULLXF xf; |
| 474 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
| 475 |
< |
register struct xfn *xp; |
| 476 |
< |
register RAY *rp; |
| 475 |
> |
struct xfn *xp; |
| 476 |
> |
const RAY *rp; |
| 477 |
|
|
| 478 |
|
/* |
| 479 |
|
* Search for transform in circular list that |
| 501 |
|
} |
| 502 |
|
|
| 503 |
|
|
| 504 |
< |
flipsurface(r) /* reverse surface orientation */ |
| 505 |
< |
register RAY *r; |
| 504 |
> |
void |
| 505 |
> |
flipsurface( /* reverse surface orientation */ |
| 506 |
> |
RAY *r |
| 507 |
> |
) |
| 508 |
|
{ |
| 509 |
|
r->rod = -r->rod; |
| 510 |
|
r->ron[0] = -r->ron[0]; |
| 513 |
|
r->pert[0] = -r->pert[0]; |
| 514 |
|
r->pert[1] = -r->pert[1]; |
| 515 |
|
r->pert[2] = -r->pert[2]; |
| 516 |
+ |
r->rflips++; |
| 517 |
|
} |
| 518 |
|
|
| 519 |
|
|
| 520 |
< |
localhit(r, scene) /* check for hit in the octree */ |
| 521 |
< |
register RAY *r; |
| 522 |
< |
register CUBE *scene; |
| 520 |
> |
int |
| 521 |
> |
rayreject( /* check if candidate hit is worse than current */ |
| 522 |
> |
OBJREC *o, |
| 523 |
> |
RAY *r, |
| 524 |
> |
double t |
| 525 |
> |
) |
| 526 |
|
{ |
| 527 |
+ |
OBJREC *mnew, *mray; |
| 528 |
+ |
|
| 529 |
+ |
if ((t <= FTINY) | (t > r->rot + FTINY)) |
| 530 |
+ |
return(1); |
| 531 |
+ |
if (t < r->rot - FTINY) /* is new hit significantly closer? */ |
| 532 |
+ |
return(0); |
| 533 |
+ |
/* coincident point, so decide... */ |
| 534 |
+ |
if (o == r->ro) |
| 535 |
+ |
return(1); /* shouldn't happen */ |
| 536 |
+ |
if (r->ro == NULL) |
| 537 |
+ |
return(0); /* ditto */ |
| 538 |
+ |
mnew = findmaterial(o); |
| 539 |
+ |
mray = findmaterial(r->ro); /* check material transparencies */ |
| 540 |
+ |
if (mnew == NULL) { |
| 541 |
+ |
if (mray != NULL) |
| 542 |
+ |
return(1); /* new has no material */ |
| 543 |
+ |
} else if (mray == NULL) { |
| 544 |
+ |
return(0); /* old has no material(!) */ |
| 545 |
+ |
} else if (istransp(mnew->otype)) { |
| 546 |
+ |
if (!istransp(mray->otype)) |
| 547 |
+ |
return(1); /* new is transparent */ |
| 548 |
+ |
} else if (istransp(mray->otype)) { |
| 549 |
+ |
return(0); /* old is transparent */ |
| 550 |
+ |
} |
| 551 |
+ |
/* weakest priority to later modifier definition */ |
| 552 |
+ |
return (r->ro->omod >= o->omod); |
| 553 |
+ |
} |
| 554 |
+ |
|
| 555 |
+ |
void |
| 556 |
+ |
rayhit( /* standard ray hit test */ |
| 557 |
+ |
OBJECT *oset, |
| 558 |
+ |
RAY *r |
| 559 |
+ |
) |
| 560 |
+ |
{ |
| 561 |
+ |
OBJREC *o; |
| 562 |
+ |
int i; |
| 563 |
+ |
|
| 564 |
+ |
for (i = oset[0]; i > 0; i--) { |
| 565 |
+ |
o = objptr(oset[i]); |
| 566 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
| 567 |
+ |
r->robj = oset[i]; |
| 568 |
+ |
} |
| 569 |
+ |
} |
| 570 |
+ |
|
| 571 |
+ |
|
| 572 |
+ |
int |
| 573 |
+ |
localhit( /* check for hit in the octree */ |
| 574 |
+ |
RAY *r, |
| 575 |
+ |
CUBE *scene |
| 576 |
+ |
) |
| 577 |
+ |
{ |
| 578 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
| 579 |
|
FVECT curpos; /* current cube position */ |
| 580 |
|
int sflags; /* sign flags */ |
| 581 |
|
double t, dt; |
| 582 |
< |
register int i; |
| 582 |
> |
int i; |
| 583 |
|
|
| 584 |
|
nrays++; /* increment trace counter */ |
| 585 |
|
sflags = 0; |
| 590 |
|
else if (r->rdir[i] < -1e-7) |
| 591 |
|
sflags |= 0x10 << i; |
| 592 |
|
} |
| 593 |
< |
if (sflags == 0) |
| 594 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
| 593 |
> |
if (!sflags) { |
| 594 |
> |
error(WARNING, "zero ray direction in localhit"); |
| 595 |
> |
return(0); |
| 596 |
> |
} |
| 597 |
> |
/* start off assuming nothing hit */ |
| 598 |
> |
if (r->rmax > FTINY) { /* except aft plane if one */ |
| 599 |
> |
r->ro = &Aftplane; |
| 600 |
> |
r->rot = r->rmax; |
| 601 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
| 602 |
> |
} |
| 603 |
> |
/* find global cube entrance point */ |
| 604 |
|
t = 0.0; |
| 605 |
|
if (!incube(scene, curpos)) { |
| 606 |
|
/* find distance to entry */ |
| 618 |
|
t = dt; /* farthest face is the one */ |
| 619 |
|
} |
| 620 |
|
t += FTINY; /* fudge to get inside cube */ |
| 621 |
+ |
if (t >= r->rot) /* clipped already */ |
| 622 |
+ |
return(0); |
| 623 |
|
/* advance position */ |
| 624 |
< |
for (i = 0; i < 3; i++) |
| 389 |
< |
curpos[i] += r->rdir[i]*t; |
| 624 |
> |
VSUM(curpos, curpos, r->rdir, t); |
| 625 |
|
|
| 626 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
| 627 |
|
return(0); |
| 628 |
|
} |
| 629 |
|
cxset[0] = 0; |
| 630 |
< |
return(raymove(curpos, cxset, sflags, r, scene) == RAYHIT && |
| 631 |
< |
r->ro != &Aftplane); |
| 630 |
> |
raymove(curpos, cxset, sflags, r, scene); |
| 631 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
| 632 |
|
} |
| 633 |
|
|
| 634 |
|
|
| 635 |
|
static int |
| 636 |
< |
raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
| 637 |
< |
FVECT pos; /* current position, modified herein */ |
| 638 |
< |
OBJECT *cxs; /* checked objects, modified by checkhit */ |
| 639 |
< |
int dirf; /* direction indicators to speed tests */ |
| 640 |
< |
register RAY *r; |
| 641 |
< |
register CUBE *cu; |
| 636 |
> |
raymove( /* check for hit as we move */ |
| 637 |
> |
FVECT pos, /* current position, modified herein */ |
| 638 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
| 639 |
> |
int dirf, /* direction indicators to speed tests */ |
| 640 |
> |
RAY *r, |
| 641 |
> |
CUBE *cu |
| 642 |
> |
) |
| 643 |
|
{ |
| 644 |
|
int ax; |
| 645 |
|
double dt, t; |
| 646 |
|
|
| 647 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
| 648 |
|
CUBE cukid; |
| 649 |
< |
register int br, sgn; |
| 649 |
> |
int br, sgn; |
| 650 |
|
|
| 651 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
| 652 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
| 684 |
|
} |
| 685 |
|
/*NOTREACHED*/ |
| 686 |
|
} |
| 687 |
< |
if (isfull(cu->cutree) && checkhit(r, cu, cxs)) |
| 687 |
> |
if (isfull(cu->cutree)) { |
| 688 |
> |
if (checkhit(r, cu, cxs)) |
| 689 |
> |
return(RAYHIT); |
| 690 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
| 691 |
|
return(RAYHIT); |
| 692 |
|
/* advance to next cube */ |
| 693 |
|
if (dirf&0x11) { |
| 712 |
|
ax = 2; |
| 713 |
|
} |
| 714 |
|
} |
| 715 |
< |
pos[0] += r->rdir[0]*t; |
| 477 |
< |
pos[1] += r->rdir[1]*t; |
| 478 |
< |
pos[2] += r->rdir[2]*t; |
| 715 |
> |
VSUM(pos, pos, r->rdir, t); |
| 716 |
|
return(ax); |
| 717 |
|
} |
| 718 |
|
|
| 719 |
|
|
| 720 |
< |
static |
| 721 |
< |
checkhit(r, cu, cxs) /* check for hit in full cube */ |
| 722 |
< |
register RAY *r; |
| 723 |
< |
CUBE *cu; |
| 724 |
< |
OBJECT *cxs; |
| 720 |
> |
static int |
| 721 |
> |
checkhit( /* check for hit in full cube */ |
| 722 |
> |
RAY *r, |
| 723 |
> |
CUBE *cu, |
| 724 |
> |
OBJECT *cxs |
| 725 |
> |
) |
| 726 |
|
{ |
| 727 |
|
OBJECT oset[MAXSET+1]; |
| 490 |
– |
register OBJREC *o; |
| 491 |
– |
register int i; |
| 728 |
|
|
| 729 |
|
objset(oset, cu->cutree); |
| 730 |
< |
checkset(oset, cxs); /* eliminate double-checking */ |
| 731 |
< |
for (i = oset[0]; i > 0; i--) { |
| 732 |
< |
o = objptr(oset[i]); |
| 733 |
< |
(*ofun[o->otype].funp)(o, r); |
| 734 |
< |
} |
| 499 |
< |
if (r->ro == NULL) |
| 730 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
| 731 |
> |
|
| 732 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
| 733 |
> |
|
| 734 |
> |
if (r->robj == OVOID) |
| 735 |
|
return(0); /* no scores yet */ |
| 736 |
|
|
| 737 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
| 738 |
|
} |
| 739 |
|
|
| 740 |
|
|
| 741 |
< |
static |
| 742 |
< |
checkset(os, cs) /* modify checked set and set to check */ |
| 743 |
< |
register OBJECT *os; /* os' = os - cs */ |
| 744 |
< |
register OBJECT *cs; /* cs' = cs + os */ |
| 741 |
> |
static void |
| 742 |
> |
checkset( /* modify checked set and set to check */ |
| 743 |
> |
OBJECT *os, /* os' = os - cs */ |
| 744 |
> |
OBJECT *cs /* cs' = cs + os */ |
| 745 |
> |
) |
| 746 |
|
{ |
| 747 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
| 748 |
< |
register int i, j; |
| 748 |
> |
int i, j; |
| 749 |
|
int k; |
| 750 |
|
/* copy os in place, cset <- cs */ |
| 751 |
|
cset[0] = 0; |
