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/* Copyright (c) 1996 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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#include "octree.h" |
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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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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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extern CUBE thescene; /* our scene */ |
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extern int maxdepth; /* maximum recursion depth */ |
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extern double minweight; /* minimum ray weight */ |
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extern int do_irrad; /* compute irradiance? */ |
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extern COLOR ambval; /* ambient value */ |
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extern COLOR cextinction; /* global extinction coefficient */ |
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extern COLOR salbedo; /* global scattering albedo */ |
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extern double seccg; /* global scattering eccentricity */ |
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extern double ssampdist; /* scatter sampling distance */ |
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unsigned long raynum = 0; /* next unique ray number */ |
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unsigned long nrays = 0; /* number of calls to localhit */ |
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static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
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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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OBJREC Aftplane; /* aft clipping plane object */ |
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static int raymove(), checkset(), checkhit(); |
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#define MAXLOOP 128 /* modifier loop detection */ |
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#define RAYHIT (-1) /* return value for intercepted ray */ |
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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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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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extern int |
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rayorigin( /* start new ray from old one */ |
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register RAY *r, |
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register RAY *ro, |
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int rt, |
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double rw |
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) |
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{ |
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double re; |
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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 if (ro->rot >= FHUGE) { /* illegal continuation */ |
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memset(r, 0, sizeof(RAY)); |
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return(-1); |
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} else { /* spawned ray */ |
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r->rlvl = ro->rlvl; |
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if (rt & RAYREFL) { |
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r->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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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->rweight = ro->rweight * rw; |
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r->crtype = ro->crtype | (r->rtype = rt); |
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VCOPY(r->rorg, ro->rop); |
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r->rweight = ro->rweight * rw; |
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/* estimate absorption */ |
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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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if (re > 0.) |
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r->rweight *= exp(-re*ro->rot); |
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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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} |
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rayclear(r) /* clear a ray for (re)evaluation */ |
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register RAY *r; |
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extern void |
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rayclear( /* clear a ray for (re)evaluation */ |
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register 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->rt = r->rot = FHUGE; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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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->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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extern void |
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rayvalue( /* 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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if (localhit(r, &thescene)) |
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raycont(r); /* hit local surface, evaluate */ |
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else if (r->ro == &Aftplane) { |
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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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extern void |
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raycont( /* check for clipped object and continue */ |
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register 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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} |
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raytrans(r) /* transmit ray as is */ |
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register RAY *r; |
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extern void |
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raytrans( /* transmit ray as is */ |
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register RAY *r |
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) |
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{ |
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RAY tr; |
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} |
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rayshade(r, mod) /* shade ray r with material mod */ |
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register RAY *r; |
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int mod; |
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extern int |
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rayshade( /* shade ray r with material mod */ |
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register 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; |
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/* check for infinite loop */ |
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if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "possible modifier loop"); |
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r->rt = r->rot; /* set effective ray length */ |
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for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
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for ( ; mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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/****** unnecessary test since modifier() is always called |
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if (!ismodifier(m->otype)) { |
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} |
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******/ |
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/* hack for irradiance calculation */ |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
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m->otype != MAT_CLIP && |
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(ofun[m->otype].flags & (T_M|T_X))) { |
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if (irr_ignore(m->otype)) { |
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depth--; |
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raytrans(r); |
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return(1); |
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} |
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if (!islight(m->otype)) |
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m = &Lamb; |
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} |
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/* materials call raytexture */ |
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gotmat = (*ofun[m->otype].funp)(m, r); |
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if ((*ofun[m->otype].funp)(m, r)) |
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return(1); /* materials call raytexture() */ |
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} |
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depth--; |
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return(gotmat); |
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return(0); /* no material! */ |
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} |
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rayparticipate(r) /* compute ray medium participation */ |
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register RAY *r; |
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extern void |
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rayparticipate( /* compute ray medium participation */ |
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register RAY *r |
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) |
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{ |
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COLOR ce, ca; |
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double dist; |
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double re, ge, be; |
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if (intens(r->cext) <= 1./FHUGE) |
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return; /* no medium */ |
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if ((dist = r->rot) >= FHUGE) |
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dist = 2.*thescene.cusize; /* what to use for infinity? */ |
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re = dist*colval(r->cext,RED); |
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ge = dist*colval(r->cext,GRN); |
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be = dist*colval(r->cext,BLU); |
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re = r->rot*colval(r->cext,RED); |
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ge = r->rot*colval(r->cext,GRN); |
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be = r->rot*colval(r->cext,BLU); |
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if (r->crtype & SHADOW) { /* no scattering for sources */ |
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re *= 1. - colval(r->albedo,RED); |
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ge *= 1. - colval(r->albedo,GRN); |
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} |
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raytexture(r, mod) /* get material modifiers */ |
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RAY *r; |
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int mod; |
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> |
extern void |
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> |
raytexture( /* get material modifiers */ |
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> |
RAY *r, |
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> |
OBJECT mod |
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> |
) |
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{ |
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static int depth = 0; |
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register OBJREC *m; |
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/* check for infinite loop */ |
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if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "modifier loop"); |
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/* execute textures and patterns */ |
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for ( ; mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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objerror(r->ro, USER, errmsg); |
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} |
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} |
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depth--; /* end here */ |
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} |
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raymixture(r, fore, back, coef) /* mix modifiers */ |
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register RAY *r; |
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OBJECT fore, back; |
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double coef; |
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> |
extern int |
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raymixture( /* mix modifiers */ |
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> |
register RAY *r, |
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> |
OBJECT fore, |
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OBJECT back, |
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> |
double coef |
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> |
) |
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{ |
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RAY fr, br; |
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int foremat, backmat; |
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/* compute foreground and background */ |
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foremat = backmat = 0; |
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/* foreground */ |
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copystruct(&fr, r); |
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> |
fr = *r; |
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if (coef > FTINY) |
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foremat = rayshade(&fr, fore); |
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/* background */ |
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copystruct(&br, r); |
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> |
br = *r; |
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if (coef < 1.0-FTINY) |
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backmat = rayshade(&br, back); |
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/* check for transparency */ |
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< |
if (backmat ^ foremat) |
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< |
if (backmat) |
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> |
if (backmat ^ foremat) { |
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> |
if (backmat && coef > FTINY) |
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raytrans(&fr); |
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< |
else |
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> |
else if (foremat && coef < 1.0-FTINY) |
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raytrans(&br); |
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} |
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/* mix perturbations */ |
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for (i = 0; i < 3; i++) |
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r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
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} |
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|
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double |
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< |
raydist(r, flags) /* compute (cumulative) ray distance */ |
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< |
register RAY *r; |
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< |
register int flags; |
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> |
extern double |
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> |
raydist( /* compute (cumulative) ray distance */ |
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> |
register RAY *r, |
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> |
register int flags |
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> |
) |
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{ |
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double sum = 0.0; |
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} |
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|
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double |
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< |
raynormal(norm, r) /* compute perturbed normal for ray */ |
| 322 |
< |
FVECT norm; |
| 323 |
< |
register RAY *r; |
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> |
extern double |
| 321 |
> |
raynormal( /* compute perturbed normal for ray */ |
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> |
FVECT norm, |
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> |
register RAY *r |
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> |
) |
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{ |
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double newdot; |
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register int i; |
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} |
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|
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< |
newrayxf(r) /* get new tranformation matrix for ray */ |
| 357 |
< |
RAY *r; |
| 356 |
> |
extern void |
| 357 |
> |
newrayxf( /* get new tranformation matrix for ray */ |
| 358 |
> |
RAY *r |
| 359 |
> |
) |
| 360 |
|
{ |
| 361 |
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static struct xfn { |
| 362 |
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struct xfn *next; |
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if (rp->rox == &xp->xf) { /* xp in use */ |
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xp = xp->next; /* move to next */ |
| 376 |
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if (xp == xflast) { /* need new one */ |
| 377 |
< |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
| 377 |
> |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
| 378 |
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if (xp == NULL) |
| 379 |
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error(SYSTEM, |
| 380 |
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"out of memory in newrayxf"); |
| 391 |
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} |
| 392 |
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|
| 393 |
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|
| 394 |
< |
flipsurface(r) /* reverse surface orientation */ |
| 395 |
< |
register RAY *r; |
| 394 |
> |
extern void |
| 395 |
> |
flipsurface( /* reverse surface orientation */ |
| 396 |
> |
register RAY *r |
| 397 |
> |
) |
| 398 |
|
{ |
| 399 |
|
r->rod = -r->rod; |
| 400 |
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r->ron[0] = -r->ron[0]; |
| 406 |
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} |
| 407 |
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|
| 408 |
|
|
| 409 |
< |
localhit(r, scene) /* check for hit in the octree */ |
| 410 |
< |
register RAY *r; |
| 411 |
< |
register CUBE *scene; |
| 409 |
> |
extern void |
| 410 |
> |
rayhit( /* standard ray hit test */ |
| 411 |
> |
OBJECT *oset, |
| 412 |
> |
RAY *r |
| 413 |
> |
) |
| 414 |
|
{ |
| 415 |
+ |
OBJREC *o; |
| 416 |
+ |
int i; |
| 417 |
+ |
|
| 418 |
+ |
for (i = oset[0]; i > 0; i--) { |
| 419 |
+ |
o = objptr(oset[i]); |
| 420 |
+ |
if ((*ofun[o->otype].funp)(o, r)) |
| 421 |
+ |
r->robj = oset[i]; |
| 422 |
+ |
} |
| 423 |
+ |
} |
| 424 |
+ |
|
| 425 |
+ |
|
| 426 |
+ |
extern int |
| 427 |
+ |
localhit( /* check for hit in the octree */ |
| 428 |
+ |
register RAY *r, |
| 429 |
+ |
register CUBE *scene |
| 430 |
+ |
) |
| 431 |
+ |
{ |
| 432 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
| 433 |
|
FVECT curpos; /* current cube position */ |
| 434 |
|
int sflags; /* sign flags */ |
| 482 |
|
} |
| 483 |
|
cxset[0] = 0; |
| 484 |
|
raymove(curpos, cxset, sflags, r, scene); |
| 485 |
< |
return(r->ro != NULL & r->ro != &Aftplane); |
| 485 |
> |
return((r->ro != NULL) & (r->ro != &Aftplane)); |
| 486 |
|
} |
| 487 |
|
|
| 488 |
|
|
| 489 |
|
static int |
| 490 |
< |
raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
| 491 |
< |
FVECT pos; /* current position, modified herein */ |
| 492 |
< |
OBJECT *cxs; /* checked objects, modified by checkhit */ |
| 493 |
< |
int dirf; /* direction indicators to speed tests */ |
| 494 |
< |
register RAY *r; |
| 495 |
< |
register CUBE *cu; |
| 490 |
> |
raymove( /* check for hit as we move */ |
| 491 |
> |
FVECT pos, /* current position, modified herein */ |
| 492 |
> |
OBJECT *cxs, /* checked objects, modified by checkhit */ |
| 493 |
> |
int dirf, /* direction indicators to speed tests */ |
| 494 |
> |
register RAY *r, |
| 495 |
> |
register CUBE *cu |
| 496 |
> |
) |
| 497 |
|
{ |
| 498 |
|
int ax; |
| 499 |
|
double dt, t; |
| 573 |
|
} |
| 574 |
|
|
| 575 |
|
|
| 576 |
< |
static |
| 577 |
< |
checkhit(r, cu, cxs) /* check for hit in full cube */ |
| 578 |
< |
register RAY *r; |
| 579 |
< |
CUBE *cu; |
| 580 |
< |
OBJECT *cxs; |
| 576 |
> |
static int |
| 577 |
> |
checkhit( /* check for hit in full cube */ |
| 578 |
> |
register RAY *r, |
| 579 |
> |
CUBE *cu, |
| 580 |
> |
OBJECT *cxs |
| 581 |
> |
) |
| 582 |
|
{ |
| 583 |
|
OBJECT oset[MAXSET+1]; |
| 553 |
– |
register OBJREC *o; |
| 554 |
– |
register int i; |
| 584 |
|
|
| 585 |
|
objset(oset, cu->cutree); |
| 586 |
< |
checkset(oset, cxs); /* eliminate double-checking */ |
| 587 |
< |
for (i = oset[0]; i > 0; i--) { |
| 588 |
< |
o = objptr(oset[i]); |
| 589 |
< |
(*ofun[o->otype].funp)(o, r); |
| 590 |
< |
} |
| 562 |
< |
if (r->ro == NULL) |
| 586 |
> |
checkset(oset, cxs); /* avoid double-checking */ |
| 587 |
> |
|
| 588 |
> |
(*r->hitf)(oset, r); /* test for hit in set */ |
| 589 |
> |
|
| 590 |
> |
if (r->robj == OVOID) |
| 591 |
|
return(0); /* no scores yet */ |
| 592 |
|
|
| 593 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
| 594 |
|
} |
| 595 |
|
|
| 596 |
|
|
| 597 |
< |
static |
| 598 |
< |
checkset(os, cs) /* modify checked set and set to check */ |
| 599 |
< |
register OBJECT *os; /* os' = os - cs */ |
| 600 |
< |
register OBJECT *cs; /* cs' = cs + os */ |
| 597 |
> |
static void |
| 598 |
> |
checkset( /* modify checked set and set to check */ |
| 599 |
> |
register OBJECT *os, /* os' = os - cs */ |
| 600 |
> |
register OBJECT *cs /* cs' = cs + os */ |
| 601 |
> |
) |
| 602 |
|
{ |
| 603 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
| 604 |
|
register int i, j; |
