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#ifndef lint |
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static const char RCSid[] = "$Id: rcontrib.c,v 2.46 2024/10/23 23:51:20 greg Exp $"; |
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#endif |
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/* |
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* Accumulate ray contributions for a set of materials |
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* Initialization and calculation routines |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "rcontrib.h" |
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#include "otypes.h" |
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#include "source.h" |
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|
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CUBE thescene; /* our scene */ |
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OBJECT nsceneobjs; /* number of objects in our scene */ |
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|
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int dimlist[MAXDIM]; /* sampling dimensions */ |
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int ndims = 0; /* number of sampling dimensions */ |
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unsigned long samplendx = 0; /* index for this sample */ |
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|
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void (*trace)() = NULL; /* trace call (NULL before rcinit) */ |
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|
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int do_irrad = 0; /* compute irradiance? */ |
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|
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int rand_samp = 1; /* pure Monte Carlo sampling? */ |
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|
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double dstrsrc = 0.9; /* square source distribution */ |
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double shadthresh = 0.; /* shadow threshold */ |
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double shadcert = .75; /* shadow certainty */ |
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int directrelay = 3; /* number of source relays */ |
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int vspretest = 512; /* virtual source pretest density */ |
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int directvis = 1; /* sources visible? */ |
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double srcsizerat = .2; /* maximum ratio source size/dist. */ |
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|
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COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
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COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
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double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
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|
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double specthresh = .02; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
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|
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int backvis = 1; /* back face visibility */ |
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|
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int maxdepth = -10; /* maximum recursion depth */ |
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double minweight = 2e-3; /* minimum ray weight */ |
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|
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char *ambfile = NULL; /* ambient file name */ |
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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int ambvwt = 0; /* initial weight for ambient value */ |
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double ambacc = 0.; /* ambient accuracy */ |
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int ambres = 256; /* ambient resolution */ |
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int ambdiv = 350; /* ambient divisions */ |
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int ambssamp = 0; /* ambient super-samples */ |
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int ambounce = 1; /* ambient bounces */ |
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char *amblist[AMBLLEN+1]; /* ambient include/exclude list */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
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int account; /* current accumulation count */ |
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RNUMBER raysleft; /* number of rays left to trace */ |
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long waitflush; /* how long until next flush */ |
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|
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RNUMBER lastray = 0; /* last ray number sent */ |
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RNUMBER lastdone = 0; /* last ray output */ |
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|
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static void trace_contrib(RAY *r); /* our trace callback */ |
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|
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static void mcfree(void *p) { epfree((*(MODCONT *)p).binv,1); free(p); } |
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|
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LUTAB modconttab = LU_SINIT(NULL,mcfree); /* modifier lookup table */ |
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|
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/************************** INITIALIZATION ROUTINES ***********************/ |
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|
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const char * |
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formstr( /* return format identifier */ |
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int f |
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) |
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{ |
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switch (f) { |
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case 'a': return("ascii"); |
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case 'f': return("float"); |
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case 'd': return("double"); |
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case 'c': return(NCSAMP==3 ? COLRFMT : SPECFMT); |
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} |
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return("unknown"); |
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} |
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|
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|
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/* Add modifier to our list to track */ |
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MODCONT * |
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addmodifier(char *modn, char *outf, char *prms, char *binv, int bincnt) |
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{ |
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static int lastNCS = 0; |
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LUENT *lep = lu_find(&modconttab,modn); |
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MODCONT *mp; |
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EPNODE *ebinv; |
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int i; |
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|
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if (!lastNCS) |
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lastNCS = NCSAMP; |
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else if (NCSAMP != lastNCS) |
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error(INTERNAL, |
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"number of spectral samples must be set before first modifier"); |
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if (lep->data != NULL) { |
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sprintf(errmsg, "duplicate modifier '%s'", modn); |
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error(USER, errmsg); |
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} |
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if (!strcmp(modn, VOIDID)) { |
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sprintf(errmsg, "cannot track '%s' modifier", VOIDID); |
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error(USER, errmsg); |
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} |
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if (nmods >= modasiz) { /* need bigger modifier array */ |
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modasiz += modasiz/2 + 64; |
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if (modname == NULL) |
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modname = (char **)malloc(modasiz*sizeof(char *)); |
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else |
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modname = (char **)realloc(modname, modasiz*sizeof(char *)); |
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if (modname == NULL) |
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error(SYSTEM, "out of memory in addmodifier()"); |
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} |
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modname[nmods++] = modn; /* XXX assumes static string */ |
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lep->key = modn; /* XXX assumes static string */ |
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if (binv == NULL) |
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binv = "0"; /* use single bin if unspecified */ |
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ebinv = eparse(binv); |
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if (ebinv->type == NUM) { /* check value if constant */ |
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bincnt = (int)(evalue(ebinv) + 1.5); |
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if (bincnt != 1) { |
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sprintf(errmsg, "illegal non-zero constant for bin (%s)", |
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binv); |
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error(USER, errmsg); |
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} |
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} else if (bincnt <= 0) { |
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sprintf(errmsg, |
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"unspecified or illegal bin count for modifier '%s'", |
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modn); |
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error(USER, errmsg); |
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} |
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/* initialize results holder */ |
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mp = (MODCONT *)malloc(mcsize(bincnt)); |
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if (mp == NULL) |
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error(SYSTEM, "out of memory in addmodifier"); |
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mp->outspec = outf; /* XXX assumes static string */ |
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mp->modname = modn; /* XXX assumes static string */ |
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mp->params = prms; /* XXX assumes static string */ |
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mp->binv = ebinv; |
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mp->bin0 = 0; |
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mp->nbins = bincnt; |
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memset(mp->cbin, 0, DCOLORSIZ*bincnt); |
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/* figure out starting bin */ |
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while (!getostream(mp->outspec, mp->modname, mp->bin0, 1)) |
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mp->bin0++; |
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/* allocate other output streams */ |
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for (i = 0; ++i < mp->nbins; ) |
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getostream(mp->outspec, mp->modname, mp->bin0+i, 1); |
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lep->data = (char *)mp; |
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return(mp); |
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} |
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|
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|
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/* Add modifiers from a file list */ |
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void |
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addmodfile(char *fname, char *outf, char *prms, char *binv, int bincnt) |
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{ |
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char *path = getpath(fname, getrlibpath(), R_OK); |
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char mod[MAXSTR]; |
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FILE *fp; |
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|
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if (path == NULL || (fp = fopen(path, "r")) == NULL) { |
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if (path == NULL) |
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sprintf(errmsg, "cannot find modifier file '%s'", fname); |
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else |
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sprintf(errmsg, "cannot load modifier file '%s'", path); |
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error(SYSTEM, errmsg); |
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} |
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while (fgetword(mod, sizeof(mod), fp) != NULL) |
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addmodifier(savqstr(mod), outf, prms, binv, bincnt); |
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fclose(fp); |
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} |
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|
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|
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/* Check if we have any more rays left (and report progress) */ |
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int |
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morays(void) |
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{ |
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static RNUMBER total_rays; |
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static time_t tstart, last_report; |
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time_t tnow; |
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|
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if (!raysleft) |
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return(1); /* unknown total, so nothing to do or say */ |
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|
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if (report_intvl > 0 && (tnow = time(0)) >= last_report+report_intvl) { |
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if (!total_rays) { |
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total_rays = raysleft; |
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tstart = tnow; |
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} else { |
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sprintf(errmsg, "%.2f%% done after %.3f hours\n", |
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100.-100.*raysleft/total_rays, |
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(1./3600.)*(tnow - tstart)); |
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eputs(errmsg); |
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} |
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last_report = tnow; |
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} |
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return(--raysleft); |
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} |
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|
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|
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/* Quit program */ |
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void |
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quit( |
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int code |
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) |
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{ |
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if (nchild > 0) /* close children if any */ |
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end_children(code != 0); |
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else if (nchild < 0) |
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_exit(code); /* avoid flush() in child */ |
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exit(code); |
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} |
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|
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|
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/* Initialize our process(es) */ |
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static void |
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rcinit(void) |
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{ |
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int i; |
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|
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if (nproc > MAXPROCESS) |
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sprintf(errmsg, "too many processes requested -- reducing to %d", |
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nproc = MAXPROCESS); |
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if (nproc > 1) |
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cow_memshare(); /* preload auxiliary data */ |
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trace = trace_contrib; /* set up trace call-back */ |
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for (i = 0; i < nsources; i++) /* tracing to sources as well */ |
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source[i].sflags |= SFOLLOW; |
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if (yres > 0) { /* set up flushing & ray counts */ |
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if (xres > 0) |
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raysleft = (RNUMBER)xres*yres; |
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else |
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raysleft = yres; |
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} else |
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raysleft = 0; |
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if ((account = accumulate) > 1) |
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raysleft *= accumulate; |
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waitflush = (yres > 0) & (xres > 1) ? 0 : xres; |
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|
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if (nproc > 1 && in_rchild()) /* forked child? */ |
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return; /* return to main processing loop */ |
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|
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if (recover) { /* recover previous output? */ |
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if (accumulate <= 0) |
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reload_output(); |
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else |
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recover_output(); |
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} |
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if (nproc == 1) /* single process? */ |
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return; |
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/* else run appropriate controller */ |
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if (accumulate <= 0) |
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feeder_loop(); |
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else |
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parental_loop(); |
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quit(0); /* parent musn't return! */ |
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} |
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|
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/************************** MAIN CALCULATION PROCESS ***********************/ |
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|
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/* Our trace call to sum contributions */ |
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static void |
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trace_contrib(RAY *r) |
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{ |
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MODCONT *mp; |
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double bval; |
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int bn; |
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SCOLOR contr; |
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DCOLORV *dvp; |
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int i; |
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|
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if (r->ro == NULL || r->ro->omod == OVOID) |
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return; |
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/* shadow ray not on source? */ |
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if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
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return; |
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|
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mp = (MODCONT *)lu_find(&modconttab,objptr(r->ro->omod)->oname)->data; |
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|
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if (mp == NULL) /* not in our list? */ |
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return; |
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|
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worldfunc(RCCONTEXT, r); /* else set context */ |
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set_eparams((char *)mp->params); |
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if ((bval = evalue(mp->binv)) <= -.5) /* and get bin number */ |
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return; /* silently ignore negatives */ |
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if ((bn = (int)(bval + .5)) >= mp->nbins) { |
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sprintf(errmsg, "bad bin number (%d ignored)", bn); |
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error(WARNING, errmsg); |
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return; |
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} |
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raycontrib(contr, r, PRIMARY); /* compute coefficient */ |
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if (contrib) |
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smultscolor(contr, r->rcol); /* -> contribution */ |
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dvp = mcbin(mp, bn); |
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for (i = 0; i < NCSAMP; i++) /* add it in */ |
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*dvp++ += contr[i]; |
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} |
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|
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|
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/* Evaluate irradiance contributions */ |
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static void |
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eval_irrad(FVECT org, FVECT dir) |
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{ |
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RAY thisray; |
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|
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VSUM(thisray.rorg, org, dir, 1.1e-4); |
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thisray.rdir[0] = -dir[0]; |
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thisray.rdir[1] = -dir[1]; |
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thisray.rdir[2] = -dir[2]; |
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thisray.rmax = 0.0; |
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rayorigin(&thisray, PRIMARY, NULL, NULL); |
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/* pretend we hit surface */ |
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thisray.rxt = thisray.rot = 1e-5; |
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thisray.rod = 1.0; |
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VCOPY(thisray.ron, dir); |
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VSUM(thisray.rop, org, dir, 1e-4); |
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samplendx++; /* compute result */ |
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(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
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} |
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|
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|
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/* Evaluate radiance contributions */ |
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static void |
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eval_rad(FVECT org, FVECT dir, double dmax) |
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{ |
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RAY thisray; |
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/* set up ray */ |
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VCOPY(thisray.rorg, org); |
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VCOPY(thisray.rdir, dir); |
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thisray.rmax = dmax; |
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rayorigin(&thisray, PRIMARY, NULL, NULL); |
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samplendx++; /* call ray evaluation */ |
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rayvalue(&thisray); |
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} |
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|
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|
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/* Accumulate and/or output ray contributions (child or only process) */ |
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static void |
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done_contrib(void) |
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{ |
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MODCONT *mp; |
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int i; |
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|
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if (account <= 0 || --account) |
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return; /* not time yet */ |
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|
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for (i = 0; i < nmods; i++) { /* output records & clear */ |
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mp = (MODCONT *)lu_find(&modconttab,modname[i])->data; |
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mod_output(mp); |
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memset(mp->cbin, 0, DCOLORSIZ*mp->nbins); |
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} |
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end_record(); /* end lines & flush if time */ |
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|
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account = accumulate; /* reset accumulation counter */ |
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} |
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|
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|
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/* Principal calculation loop (called by main) */ |
| 369 |
void |
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rcontrib(void) |
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{ |
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static int ignore_warning_given = 0; |
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FVECT orig, direc; |
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double d; |
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/* initialize (& fork more of us) */ |
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rcinit(); |
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/* load rays from stdin & process */ |
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#ifdef getc_unlocked |
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flockfile(stdin); /* avoid mutex overhead */ |
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#endif |
| 381 |
while (getvec(orig) == 0 && getvec(direc) == 0) { |
| 382 |
d = normalize(direc); |
| 383 |
if (nchild != -1 && (d == 0.0) & (accumulate == 0)) { |
| 384 |
if (!ignore_warning_given++) |
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error(WARNING, |
| 386 |
"dummy ray(s) ignored during accumulation\n"); |
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continue; |
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} |
| 389 |
if (lastray+1 < lastray) |
| 390 |
lastray = lastdone = 0; |
| 391 |
++lastray; |
| 392 |
if (d == 0.0) { /* zero ==> flush */ |
| 393 |
if ((yres <= 0) | (xres <= 1)) |
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waitflush = 1; /* flush after */ |
| 395 |
if (nchild == -1) |
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account = 1; |
| 397 |
} else if (imm_irrad) { /* else compute */ |
| 398 |
eval_irrad(orig, direc); |
| 399 |
} else { |
| 400 |
eval_rad(orig, direc, lim_dist ? d : 0.0); |
| 401 |
} |
| 402 |
done_contrib(); /* accumulate/output */ |
| 403 |
++lastdone; |
| 404 |
if (!morays()) |
| 405 |
break; /* preemptive EOI */ |
| 406 |
} |
| 407 |
if (nchild != -1 && (accumulate <= 0) | (account < accumulate)) { |
| 408 |
if (account < accumulate) { |
| 409 |
error(WARNING, "partial accumulation in final record"); |
| 410 |
accumulate -= account; |
| 411 |
} |
| 412 |
account = 1; /* output accumulated totals */ |
| 413 |
done_contrib(); |
| 414 |
} |
| 415 |
lu_done(&ofiletab); /* close output files */ |
| 416 |
if (raysleft) |
| 417 |
error(USER, "unexpected EOF on input"); |
| 418 |
} |
