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/* Copyright (c) 1994 Regents of the University of California */ |
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|
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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 int raymove(), checkset(), checkhit(); |
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OBJREC Aftplane; /* aft clipping plane object */ |
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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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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->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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|
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|
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rayclear(r) /* clear a ray for (re)evaluation */ |
138 |
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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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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->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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|
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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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else if (sourcehit(r)) |
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gotmat = 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 (!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)) || |
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< |
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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|
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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 */ |
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RAY *r |
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> |
) |
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{ |
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RAY tr; |
198 |
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|
199 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
200 |
< |
VCOPY(tr.rdir, r->rdir); |
201 |
< |
rayvalue(&tr); |
202 |
< |
copycolor(r->rcol, tr.rcol); |
203 |
< |
r->rt = r->rot + tr.rt; |
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> |
rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
200 |
> |
VCOPY(tr.rdir, r->rdir); |
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> |
rayvalue(&tr); |
202 |
> |
copycolor(r->mcol, tr.mcol); |
203 |
> |
copycolor(r->rcol, tr.rcol); |
204 |
> |
r->rmt = r->rot + tr.rmt; |
205 |
> |
r->rxt = r->rot + tr.rxt; |
206 |
> |
} |
207 |
> |
|
208 |
> |
|
209 |
> |
int |
210 |
> |
raytirrad( /* irradiance hack */ |
211 |
> |
OBJREC *m, |
212 |
> |
RAY *r |
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> |
) |
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> |
{ |
215 |
> |
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); |
218 |
> |
return(1); |
219 |
> |
} |
220 |
> |
if (!islight(m->otype)) |
221 |
> |
return((*ofun[Lamb.otype].funp)(&Lamb, r)); |
222 |
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} |
223 |
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return(0); /* not a qualifying surface */ |
224 |
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} |
225 |
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|
226 |
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|
227 |
< |
rayshade(r, mod) /* shade ray r with material mod */ |
228 |
< |
register RAY *r; |
229 |
< |
int mod; |
227 |
> |
int |
228 |
> |
rayshade( /* shade ray r with material mod */ |
229 |
> |
RAY *r, |
230 |
> |
int mod |
231 |
> |
) |
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{ |
233 |
< |
static int depth = 0; |
234 |
< |
int gotmat; |
235 |
< |
register OBJREC *m; |
236 |
< |
/* check for infinite loop */ |
237 |
< |
if (depth++ >= MAXLOOP) |
144 |
< |
objerror(r->ro, USER, "possible modifier loop"); |
145 |
< |
r->rt = r->rot; /* set effective ray length */ |
146 |
< |
for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
233 |
> |
int tst_irrad = do_irrad && !(r->crtype & ~(PRIMARY|TRANS)); |
234 |
> |
OBJREC *m; |
235 |
> |
|
236 |
> |
r->rxt = r->rot; /* preset effective ray length */ |
237 |
> |
for ( ; mod != OVOID; mod = m->omod) { |
238 |
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m = objptr(mod); |
239 |
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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; |
160 |
< |
} |
161 |
< |
if (!islight(m->otype)) |
162 |
< |
m = &Lamb; |
163 |
< |
} |
164 |
< |
/* materials call raytexture */ |
165 |
< |
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--; |
168 |
< |
return(gotmat); |
252 |
> |
return(0); /* no material! */ |
253 |
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} |
254 |
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|
255 |
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|
256 |
< |
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 |
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{ |
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 |
|
} |
193 |
– |
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 |
< |
COLOR ctmp; |
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 = 0; |
338 |
|
/* foreground */ |
339 |
< |
copystruct(&fr, r); |
340 |
< |
fr.pert[0] = fr.pert[1] = fr.pert[2] = 0.0; |
341 |
< |
setcolor(fr.pcol, 1.0, 1.0, 1.0); |
342 |
< |
setcolor(fr.rcol, 0.0, 0.0, 0.0); |
216 |
< |
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 |
< |
else |
219 |
< |
foremat = 0; |
344 |
> |
} |
345 |
|
/* background */ |
346 |
< |
copystruct(&br, r); |
347 |
< |
br.pert[0] = br.pert[1] = br.pert[2] = 0.0; |
348 |
< |
setcolor(br.pcol, 1.0, 1.0, 1.0); |
349 |
< |
setcolor(br.rcol, 0.0, 0.0, 0.0); |
225 |
< |
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 |
< |
else |
352 |
< |
backmat = foremat; |
353 |
< |
/* check */ |
354 |
< |
if (backmat != foremat) |
355 |
< |
objerror(r->ro, USER, "mixing material with non-material"); |
356 |
< |
/* sum perturbations */ |
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]; |
362 |
< |
/* multiply pattern colors */ |
361 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
362 |
> |
/* mix pattern colors */ |
363 |
|
scalecolor(fr.pcol, coef); |
364 |
|
scalecolor(br.pcol, 1.0-coef); |
365 |
< |
copycolor(ctmp, fr.pcol); |
366 |
< |
addcolor(ctmp, br.pcol); |
367 |
< |
multcolor(r->pcol, ctmp); |
368 |
< |
/* sum returned ray values */ |
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 |
|
scalecolor(fr.rcol, coef); |
372 |
|
scalecolor(br.rcol, 1.0-coef); |
373 |
< |
addcolor(r->rcol, fr.rcol); |
373 |
> |
copycolor(r->rcol, fr.rcol); |
374 |
|
addcolor(r->rcol, br.rcol); |
375 |
< |
if (foremat) |
376 |
< |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
377 |
< |
/* return value tells if material */ |
378 |
< |
return(foremat); |
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 |
< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
389 |
< |
FVECT norm; |
390 |
< |
register RAY *r; |
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(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( /* 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++) |
377 |
< |
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); |
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; |
464 |
< |
pos[1] += r->rdir[1]*t; |
465 |
< |
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]; |
477 |
– |
register OBJREC *o; |
478 |
– |
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 |
< |
} |
486 |
< |
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; |