--- ray/src/rt/source.c 1993/08/18 00:19:05 2.12 +++ ray/src/rt/source.c 2003/02/25 02:47:23 2.30 @@ -1,23 +1,28 @@ -/* Copyright (c) 1993 Regents of the University of California */ - #ifndef lint -static char SCCSid[] = "$SunId$ LBL"; +static const char RCSid[] = "$Id: source.c,v 2.30 2003/02/25 02:47:23 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; @@ -68,6 +74,9 @@ marksources() /* find and mark source objects */ o->otype != OBJ_SOURCE && m->oargs.farg[3] <= FTINY) continue; /* don't bother */ + if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && + m->oargs.farg[2] <= FTINY) + continue; /* don't bother */ if (sfun[o->otype].of == NULL || sfun[o->otype].of->setsrc == NULL) @@ -114,6 +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 */ @@ -128,7 +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 */ } @@ -138,7 +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; @@ -151,8 +179,9 @@ SRCINDEX *si; /* source sample index */ } +void srcvalue(r) /* punch ray to source and compute value */ -RAY *r; +register RAY *r; { register SRCREC *sp; @@ -161,7 +190,9 @@ RAY *r; /* check intersection */ if (!(*ofun[sp->so->otype].funp)(sp->so, r)) return; - raycont(r); /* compute contribution */ + if (!rayshade(r, r->ro->omod)) /* compute contribution */ + goto nomat; + rayparticipate(r); return; } /* compute intersection */ @@ -169,9 +200,12 @@ RAY *r; (*ofun[sp->so->otype].funp)(sp->so, r)) { if (sp->sa.success >= 0) sp->sa.success++; - raycont(r); /* compute contribution */ + if (!rayshade(r, r->ro->omod)) /* compute contribution */ + goto nomat; + rayparticipate(r); return; } + /* we missed our mark! */ if (sp->sa.success < 0) return; /* bitched already */ sp->sa.success -= AIMREQT; @@ -180,9 +214,13 @@ RAY *r; sprintf(errmsg, "aiming failure for light source \"%s\"", sp->so->oname); error(WARNING, errmsg); /* issue warning */ + return; +nomat: + objerror(r->ro, USER, "material not found"); } +int sourcehit(r) /* check to see if ray hit distant source */ register RAY *r; { @@ -208,6 +246,7 @@ 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; @@ -230,12 +269,13 @@ 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; @@ -299,8 +339,10 @@ char *p; /* data for f */ /* modify threshold */ ourthresh = shadthresh / r->rweight; /* test for shadows */ - nhits = 0; - for (sn = 0; sn < ncnts; sn++) { + for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; + hwt += (double)source[scp->sno].nhits / + (double)source[scp->sno].ntests, + sn++) { /* check threshold */ if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : cntord[sn].brt-cntord[sn+nshadcheck].brt) @@ -317,6 +359,7 @@ char *p; /* data for f */ source[scp->sno].sflags & SFOLLOW )) { /* follow entire path */ raycont(&sr); + rayparticipate(&sr); if (trace != NULL) (*trace)(&sr); /* trace execution */ if (bright(sr.rcol) <= FTINY) @@ -329,13 +372,13 @@ char *p; /* data for f */ nhits++; source[scp->sno].nhits++; } - /* surface hit rate */ - if (sn > 0) - hwt = (double)nhits / (double)sn; + /* source hit rate */ + if (hwt > FTINY) + hwt = (double)nhits / hwt; else hwt = 0.5; #ifdef DEBUG - sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", + sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", sn, ncnts-sn, hwt); eputs(errmsg); #endif @@ -344,12 +387,88 @@ char *p; /* data for f */ scp = srccnt + cntord[sn].sndx; prob = hwt * (double)source[scp->sno].nhits / (double)source[scp->sno].ntests; + if (prob > 1.0) + prob = 1.0; scalecolor(scp->val, prob); addcolor(r->rcol, scp->val); } } +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. @@ -391,9 +510,9 @@ return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} * (Glows with negative radii should NEVER participate in illumination.) */ -#define distglow(m, r) (m->otype==MAT_GLOW && \ +#define distglow(m, r, d) (m->otype==MAT_GLOW && \ m->oargs.farg[3] >= -FTINY && \ - r->rot > m->oargs.farg[3]) + d > m->oargs.farg[3]) /* badcomponent * * @@ -406,7 +525,7 @@ return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} #define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ !(r->crtype&SHADOW || r->rod < 0.0 || \ - distglow(m, r))) + /* not 100% correct */ distglow(m, r, r->rot))) /* passillum * * @@ -424,37 +543,37 @@ return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} * The -dv flag is normally on for sources to be visible. */ -#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ - !distglow(m, r)) +#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ + distglow(m, r, raydist(r,PRIMARY))) +int m_light(m, r) /* ray hit a light source */ register OBJREC *m; register RAY *r; { /* check for over-counting */ if (badcomponent(m, r)) - return; - if (wrongsource(m,r)) - return; + return(1); + if (wrongsource(m, r)) + return(1); /* check for passed illum */ if (passillum(m, r)) { - if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) - raytrans(r); - else - rayshade(r, modifier(m->oargs.sarg[0])); - return; + if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) + return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); + raytrans(r); + return(1); } /* otherwise treat as source */ /* check for behind */ if (r->rod < 0.0) - return; + return(1); /* check for invisibility */ if (srcignore(m, r)) - return; + return(1); /* check for outside spot */ - if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) - return; + if (m->otype==MAT_SPOT && spotout(r, makespot(m))) + return(1); /* get distribution pattern */ raytexture(r, m->omod); /* get source color */ @@ -463,4 +582,5 @@ register RAY *r; m->oargs.farg[2]); /* modify value */ multcolor(r->rcol, r->pcol); + return(1); }