--- ray/src/rt/source.c 1995/11/02 17:37:58 2.17 +++ ray/src/rt/source.c 2003/03/11 17:08:55 2.31 @@ -1,23 +1,28 @@ -/* Copyright (c) 1995 Regents of the University of California */ - #ifndef lint -static char SCCSid[] = "$SunId$ LBL"; +static const char RCSid[] = "$Id: source.c,v 2.31 2003/03/11 17:08:55 greg Exp $"; #endif - /* * source.c - routines dealing with illumination sources. * - * 8/20/85 + * External symbols declared in source.h */ +#include "copyright.h" + #include "ray.h" -#include "octree.h" - #include "otypes.h" #include "source.h" +#include "random.h" + +extern double ssampdist; /* scatter sampling distance */ + +#ifndef MAXSSAMP +#define MAXSSAMP 16 /* maximum samples per ray */ +#endif + /* * Structures used by direct() */ @@ -39,6 +44,7 @@ static CNTPTR *cntord; /* source ordering in direct static int maxcntr = 0; /* size of contribution arrays */ +void marksources() /* find and mark source objects */ { int foundsource = 0; @@ -117,6 +123,25 @@ memerr: } +void +freesources() /* free all source structures */ +{ + if (nsources > 0) { + free((void *)source); + source = NULL; + nsources = 0; + } + if (maxcntr <= 0) + return; + free((void *)srccnt); + srccnt = NULL; + free((void *)cntord); + cntord = NULL; + maxcntr = 0; +} + + +int srcray(sr, r, si) /* send a ray to a source, return domega */ register RAY *sr; /* returned source ray */ RAY *r; /* ray which hit object */ @@ -131,7 +156,7 @@ SRCINDEX *si; /* source sample index */ sr->rsrc = si->sn; /* remember source */ srcp = source + si->sn; if (srcp->sflags & SDISTANT) { - if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) + if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) continue; return(1); /* sample OK */ } @@ -141,7 +166,7 @@ SRCINDEX *si; /* source sample index */ continue; /* check angle */ if (srcp->sflags & SSPOT) { - if (spotout(sr, srcp->sl.s, 0)) + if (spotout(sr, srcp->sl.s)) continue; /* adjust solid angle */ si->dom *= d*d; @@ -154,6 +179,7 @@ SRCINDEX *si; /* source sample index */ } +void srcvalue(r) /* punch ray to source and compute value */ register RAY *r; { @@ -166,6 +192,7 @@ register RAY *r; return; if (!rayshade(r, r->ro->omod)) /* compute contribution */ goto nomat; + rayparticipate(r); return; } /* compute intersection */ @@ -175,6 +202,7 @@ register RAY *r; sp->sa.success++; if (!rayshade(r, r->ro->omod)) /* compute contribution */ goto nomat; + rayparticipate(r); return; } /* we missed our mark! */ @@ -192,6 +220,7 @@ nomat: } +int sourcehit(r) /* check to see if ray hit distant source */ register RAY *r; { @@ -217,9 +246,12 @@ register RAY *r; } if (r->ro != NULL) { + r->robj = objndx(r->ro); for (i = 0; i < 3; i++) r->ron[i] = -r->rdir[i]; r->rod = 1.0; + r->pert[0] = r->pert[1] = r->pert[2] = 0.0; + r->uv[0] = r->uv[1] = 0.0; r->rox = NULL; return(1); } @@ -239,12 +271,13 @@ register CNTPTR *sc1, *sc2; } +void direct(r, f, p) /* add direct component */ RAY *r; /* ray that hit surface */ -int (*f)(); /* direct component coefficient function */ +void (*f)(); /* direct component coefficient function */ char *p; /* data for f */ { - extern int (*trace)(); + extern void (*trace)(); register int sn; register CONTRIB *scp; SRCINDEX si; @@ -327,8 +360,8 @@ char *p; /* data for f */ ( sr.ro != source[scp->sno].so || source[scp->sno].sflags & SFOLLOW )) { /* follow entire path */ - if (!raycont(&sr)) - objerror(sr.ro, USER, "material not found"); + raycont(&sr); + rayparticipate(&sr); if (trace != NULL) (*trace)(&sr); /* trace execution */ if (bright(sr.rcol) <= FTINY) @@ -364,6 +397,80 @@ char *p; /* data for f */ } +void +srcscatter(r) /* compute source scattering into ray */ +register RAY *r; +{ + int oldsampndx; + int nsamps; + RAY sr; + SRCINDEX si; + double t, d; + double re, ge, be; + COLOR cvext; + int i, j; + + if (r->slights == NULL || r->slights[0] == 0 + || r->gecc >= 1.-FTINY || r->rot >= FHUGE) + return; + if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) + nsamps = 1; +#if MAXSSAMP + else if (nsamps > MAXSSAMP) + nsamps = MAXSSAMP; +#endif + oldsampndx = samplendx; + samplendx = random()&0x7fff; /* randomize */ + for (i = r->slights[0]; i > 0; i--) { /* for each source */ + for (j = 0; j < nsamps; j++) { /* for each sample position */ + samplendx++; + t = r->rot * (j+frandom())/nsamps; + /* extinction */ + re = t*colval(r->cext,RED); + ge = t*colval(r->cext,GRN); + be = t*colval(r->cext,BLU); + setcolor(cvext, re > 92. ? 0. : exp(-re), + ge > 92. ? 0. : exp(-ge), + be > 92. ? 0. : exp(-be)); + if (intens(cvext) <= FTINY) + break; /* too far away */ + sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; + sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; + sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; + sr.rmax = 0.; + initsrcindex(&si); /* sample ray to this source */ + si.sn = r->slights[i]; + nopart(&si, &sr); + if (!srcray(&sr, NULL, &si) || + sr.rsrc != r->slights[i]) + continue; /* no path */ + copycolor(sr.cext, r->cext); + copycolor(sr.albedo, r->albedo); + sr.gecc = r->gecc; + sr.slights = r->slights; + rayvalue(&sr); /* eval. source ray */ + if (bright(sr.rcol) <= FTINY) + continue; + if (r->gecc <= FTINY) /* compute P(theta) */ + d = 1.; + else { + d = DOT(r->rdir, sr.rdir); + d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; + d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); + } + /* other factors */ + d *= si.dom * r->rot / (4.*PI*nsamps); + multcolor(sr.rcol, r->cext); + multcolor(sr.rcol, r->albedo); + scalecolor(sr.rcol, d); + multcolor(sr.rcol, cvext); + addcolor(r->rcol, sr.rcol); /* add it in */ + } + } + samplendx = oldsampndx; +} + + /**************************************************************** * The following macros were separated from the m_light() routine * because they are very nasty and difficult to understand. @@ -442,6 +549,7 @@ return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} distglow(m, r, raydist(r,PRIMARY))) +int m_light(m, r) /* ray hit a light source */ register OBJREC *m; register RAY *r; @@ -454,7 +562,7 @@ register RAY *r; /* check for passed illum */ if (passillum(m, r)) { if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) - return(rayshade(r, modifier(m->oargs.sarg[0]))); + return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); raytrans(r); return(1); } @@ -466,7 +574,7 @@ register RAY *r; if (srcignore(m, r)) return(1); /* check for outside spot */ - if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) + if (m->otype==MAT_SPOT && spotout(r, makespot(m))) return(1); /* get distribution pattern */ raytexture(r, m->omod);