src/rt/rcontrib.c

#ifndef lint
static const char RCSid[] = "$Id: rcontrib.c,v 2.22 2014/07/19 20:03:03 greg Exp $";
#endif
/*
 * Accumulate ray contributions for a set of materials
 * Initialization and calculation routines
 */

#include "copyright.h"

#include <ctype.h>
#include "rcontrib.h"
#include "otypes.h"
#include "source.h"

char    *shm_boundary = NULL;           /* boundary of shared memory */

CUBE    thescene;                       /* our scene */
OBJECT  nsceneobjs;                     /* number of objects in our scene */

int     dimlist[MAXDIM];                /* sampling dimensions */
int     ndims = 0;                      /* number of sampling dimensions */
int     samplendx = 0;                  /* index for this sample */

static void     trace_contrib(RAY *r);  /* our trace callback */
void    (*trace)() = trace_contrib;

int     do_irrad = 0;                   /* compute irradiance? */

int     rand_samp = 1;                  /* pure Monte Carlo sampling? */

double  dstrsrc = 0.9;                  /* square source distribution */
double  shadthresh = .03;               /* shadow threshold */
double  shadcert = .75;                 /* shadow certainty */
int     directrelay = 3;                /* number of source relays */
int     vspretest = 512;                /* virtual source pretest density */
int     directvis = 1;                  /* sources visible? */
double  srcsizerat = .2;                /* maximum ratio source size/dist. */

COLOR   cextinction = BLKCOLOR;         /* global extinction coefficient */
COLOR   salbedo = BLKCOLOR;             /* global scattering albedo */
double  seccg = 0.;                     /* global scattering eccentricity */
double  ssampdist = 0.;                 /* scatter sampling distance */

double  specthresh = .15;               /* specular sampling threshold */
double  specjitter = 1.;                /* specular sampling jitter */

int     backvis = 1;                    /* back face visibility */

int     maxdepth = -10;                 /* maximum recursion depth */
double  minweight = 2e-3;               /* minimum ray weight */

char    *ambfile = NULL;                /* ambient file name */
COLOR   ambval = BLKCOLOR;              /* ambient value */
int     ambvwt = 0;                     /* initial weight for ambient value */
double  ambacc = 0;                     /* ambient accuracy */
int     ambres = 256;                   /* ambient resolution */
int     ambdiv = 350;                   /* ambient divisions */
int     ambssamp = 0;                   /* ambient super-samples */
int     ambounce = 1;                   /* ambient bounces */
char    *amblist[AMBLLEN+1];            /* ambient include/exclude list */
int     ambincl = -1;                   /* include == 1, exclude == 0 */

int     account;                        /* current accumulation count */
RNUMBER raysleft;                       /* number of rays left to trace */
long    waitflush;                      /* how long until next flush */

RNUMBER lastray = 0;                    /* last ray number sent */
RNUMBER lastdone = 0;                   /* last ray output */

static void mcfree(void *p) { epfree((*(MODCONT *)p).binv); free(p); }

LUTAB   modconttab = LU_SINIT(NULL,mcfree);     /* modifier lookup table */

/************************** INITIALIZATION ROUTINES ***********************/

char *
formstr(                                /* return format identifier */
        int  f
)
{
        switch (f) {
        case 'a': return("ascii");
        case 'f': return("float");
        case 'd': return("double");
        case 'c': return(COLRFMT);
        }
        return("unknown");
}


/* Add modifier to our list to track */
MODCONT *
addmodifier(char *modn, char *outf, char *prms, char *binv, int bincnt)
{
        LUENT   *lep = lu_find(&modconttab,modn);
        MODCONT *mp;
        EPNODE  *ebinv;
        int     i;
        
        if (lep->data != NULL) {
                sprintf(errmsg, "duplicate modifier '%s'", modn);
                error(USER, errmsg);
        }
        if (nmods >= MAXMODLIST)
                error(INTERNAL, "too many modifiers");
        modname[nmods++] = modn;        /* XXX assumes static string */
        lep->key = modn;                /* XXX assumes static string */
        if (binv == NULL)
                binv = "0";             /* use single bin if unspecified */
        ebinv = eparse(binv);
        if (ebinv->type == NUM) {       /* check value if constant */
                bincnt = (int)(evalue(ebinv) + 1.5);
                if (bincnt != 1) {
                        sprintf(errmsg, "illegal non-zero constant for bin (%s)",
                                        binv);
                        error(USER, errmsg);
                }
        } else if (bincnt <= 0) {
                sprintf(errmsg,
                        "unspecified or illegal bin count for modifier '%s'",
                                modn);
                error(USER, errmsg);
        }
                                        /* initialize results holder */
        mp = (MODCONT *)malloc(sizeof(MODCONT)+sizeof(DCOLOR)*(bincnt-1));
        if (mp == NULL)
                error(SYSTEM, "out of memory in addmodifier");
        mp->outspec = outf;             /* XXX assumes static string */
        mp->modname = modn;             /* XXX assumes static string */
        mp->params = prms;
        mp->binv = ebinv;
        mp->nbins = bincnt;
        memset(mp->cbin, 0, sizeof(DCOLOR)*bincnt);
                                        /* allocate output streams */
        for (i = bincnt; i-- > 0; )
                getostream(mp->outspec, mp->modname, i, 1);
        lep->data = (char *)mp;
        return(mp);
}


/* Add modifiers from a file list */
void
addmodfile(char *fname, char *outf, char *prms, char *binv, int bincnt)
{
        char    *mname[MAXMODLIST];
        int     i;
                                        /* find the file & store strings */
        if (wordfile(mname, getpath(fname, getrlibpath(), R_OK)) < 0) {
                sprintf(errmsg, "cannot find modifier file '%s'", fname);
                error(SYSTEM, errmsg);
        }
        for (i = 0; mname[i]; i++)      /* add each one */
                addmodifier(mname[i], outf, prms, binv, bincnt);
}


void
quit(                   /* quit program */
        int  code
)
{
        if (nchild > 0)         /* close children if any */
                end_children(code != 0);
        exit(code);
}


/* Initialize our process(es) */
static void
rcinit()
{
        int     i;

        if (nproc > MAXPROCESS)
                sprintf(errmsg, "too many processes requested -- reducing to %d",
                                nproc = MAXPROCESS);
        if (nproc > 1) {
                preload_objs();         /* preload auxiliary data */
                                        /* set shared memory boundary */
                shm_boundary = strcpy((char *)malloc(16), "SHM_BOUNDARY");
        }
        for (i = 0; i < nsources; i++)  /* tracing to sources as well */
                source[i].sflags |= SFOLLOW;
        if (yres > 0) {                 /* set up flushing & ray counts */
                if (xres > 0)
                        raysleft = (RNUMBER)xres*yres;
                else
                        raysleft = yres;
        } else
                raysleft = 0;
        if ((account = accumulate) > 1)
                raysleft *= accumulate;
        waitflush = (yres > 0) & (xres > 1) ? 0 : xres;

        if (nproc > 1 && in_rchild())   /* forked child? */
                return;                 /* return to main processing loop */

        if (recover) {                  /* recover previous output? */
                if (accumulate <= 0)
                        reload_output();
                else
                        recover_output();
        }
        if (nproc == 1)                 /* single process? */
                return;
                                        /* else run appropriate controller */
        if (accumulate <= 0)
                feeder_loop();
        else
                parental_loop();
        quit(0);                        /* parent musn't return! */
}

/************************** MAIN CALCULATION PROCESS ***********************/

/* Set parameters for current bin evaluation */
void
set_eparams(char *prms)
{
        static char     *last_params = NULL;
        char            vname[RMAXWORD];
        double          value;
        char            *cpd;
                                        /* check if already set */
        if ((prms == NULL) | (prms == last_params))
                return;
        if (last_params != NULL && !strcmp(prms, last_params))
                return;
        last_params = prms;             /* assign each variable */
        while (*prms) {
                if (isspace(*prms)) {
                        ++prms; continue;
                }
                if (!isalpha(*prms))
                        goto bad_params;
                cpd = vname;
                while (*prms && (*prms != '=') & !isspace(*prms)) {
                        if (!isid(*prms))
                                goto bad_params;
                        *cpd++ = *prms++;
                }
                if (cpd == vname)
                        goto bad_params;
                *cpd = '\0';
                while (isspace(*prms)) prms++;
                if (*prms++ != '=')
                        goto bad_params;
                value = atof(prms);
                if ((prms = fskip(prms)) == NULL)
                        goto bad_params;
                while (isspace(*prms)) prms++;
                prms += (*prms == ',') | (*prms == ';');
                varset(vname, '=', value);
        }
        return;
bad_params:
        sprintf(errmsg, "bad parameter list '%s'", last_params);
        error(USER, errmsg);
}


/* Our trace call to sum contributions */
static void
trace_contrib(RAY *r)
{
        MODCONT *mp;
        double  bval;
        int     bn;
        RREAL   contr[3];

        if (r->ro == NULL || r->ro->omod == OVOID)
                return;
                                                /* shadow ray not on source? */
        if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
                return;

        mp = (MODCONT *)lu_find(&modconttab,objptr(r->ro->omod)->oname)->data;

        if (mp == NULL)                         /* not in our list? */
                return;

        worldfunc(RCCONTEXT, r);                /* else set context */
        set_eparams((char *)mp->params);
        if ((bval = evalue(mp->binv)) <= -.5)   /* and get bin number */
                return;                         /* silently ignore negatives */
        if ((bn = (int)(bval + .5)) >= mp->nbins) {
                sprintf(errmsg, "bad bin number (%d ignored)", bn);
                error(WARNING, errmsg);
                return;
        }
        raycontrib(contr, r, PRIMARY);          /* compute coefficient */
        if (contrib)
                multcolor(contr, r->rcol);      /* -> contribution */
        addcolor(mp->cbin[bn], contr);
}


/* Evaluate irradiance contributions */
static void
eval_irrad(FVECT org, FVECT dir)
{
        RAY     thisray;

        VSUM(thisray.rorg, org, dir, 1.1e-4);
        thisray.rdir[0] = -dir[0];
        thisray.rdir[1] = -dir[1];
        thisray.rdir[2] = -dir[2];
        thisray.rmax = 0.0;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
                                        /* pretend we hit surface */
        thisray.rt = thisray.rot = 1e-5;
        thisray.rod = 1.0;
        VCOPY(thisray.ron, dir);
        VSUM(thisray.rop, org, dir, 1e-4);
        samplendx++;                    /* compute result */
        (*ofun[Lamb.otype].funp)(&Lamb, &thisray);
}


/* Evaluate radiance contributions */
static void
eval_rad(FVECT org, FVECT dir, double dmax)
{
        RAY     thisray;
                                        /* set up ray */
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        thisray.rmax = dmax;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
        samplendx++;                    /* call ray evaluation */
        rayvalue(&thisray);
}


/* Accumulate and/or output ray contributions (child or only process) */
static void
done_contrib()
{
        MODCONT *mp;
        int     i;

        if (account <= 0 || --account)
                return;                 /* not time yet */

        for (i = 0; i < nmods; i++) {   /* output records & clear */
                mp = (MODCONT *)lu_find(&modconttab,modname[i])->data;
                mod_output(mp);
                memset(mp->cbin, 0, sizeof(DCOLOR)*mp->nbins);
        }
        end_record();                   /* end lines & flush if time */

        account = accumulate;           /* reset accumulation counter */
}


/* Principal calculation loop (called by main) */
void
rcontrib()
{
        static int      ignore_warning_given = 0;
        FVECT           orig, direc;
        double          d;
                                        /* initialize (& fork more of us) */
        rcinit();
                                        /* load rays from stdin & process */
#ifdef getc_unlocked
        flockfile(stdin);               /* avoid mutex overhead */
#endif
        while (getvec(orig) == 0 && getvec(direc) == 0) {
                d = normalize(direc);
                if (nchild != -1 && (d == 0.0) & (accumulate == 0)) {
                        if (!ignore_warning_given++)
                                error(WARNING,
                                "dummy ray(s) ignored during accumulation\n");
                        continue;
                }
                if (lastray+1 < lastray)
                        lastray = lastdone = 0;
                ++lastray;
                if (d == 0.0) {                         /* zero ==> flush */
                        if ((yres <= 0) | (xres <= 1))
                                waitflush = 1;          /* flush after */
                        if (nchild == -1)
                                account = 1;
                } else if (imm_irrad) {                 /* else compute */
                        eval_irrad(orig, direc);
                } else {
                        eval_rad(orig, direc, lim_dist ? d : 0.0);
                }
                done_contrib();         /* accumulate/output */
                ++lastdone;
                if (raysleft && !--raysleft)
                        break;          /* preemptive EOI */
        }
        if (nchild != -1 && (accumulate <= 0) | (account < accumulate)) {
                if (account < accumulate) {
                        error(WARNING, "partial accumulation in final record");
                        accumulate -= account;
                }
                account = 1;            /* output accumulated totals */
                done_contrib();
        }
        lu_done(&ofiletab);             /* close output files */
        if (raysleft)
                error(USER, "unexpected EOF on input");
}
Revision:	2.23
Committed:	Mon Aug 25 13:18:30 2014 UTC (9 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2P2, rad4R2P1
Changes since 2.22:	+3 -2 lines
Log Message:	Added bad bin number reporting
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.23	static const char RCSid[] = "$Id: rcontrib.c,v 2.22 2014/07/19 20:03:03 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Accumulate ray contributions for a set of materials
6			* Initialization and calculation routines
7			*/
8
9	greg	2.20	#include "copyright.h"
10
11			#include <ctype.h>
12	greg	2.1	#include "rcontrib.h"
13			#include "otypes.h"
14	greg	2.14	#include "source.h"
15	greg	2.1
16	greg	2.2	char shm_boundary = NULL; / boundary of shared memory */
17
18	greg	2.1	CUBE thescene; /* our scene */
19			OBJECT nsceneobjs; /* number of objects in our scene */
20
21			int dimlist[MAXDIM]; /* sampling dimensions */
22			int ndims = 0; /* number of sampling dimensions */
23			int samplendx = 0; /* index for this sample */
24
25			static void trace_contrib(RAY r); / our trace callback */
26			void (*trace)() = trace_contrib;
27
28			int do_irrad = 0; /* compute irradiance? */
29
30	greg	2.3	int rand_samp = 1; /* pure Monte Carlo sampling? */
31	greg	2.1
32	greg	2.8	double dstrsrc = 0.9; /* square source distribution */
33	greg	2.1	double shadthresh = .03; /* shadow threshold */
34			double shadcert = .75; /* shadow certainty */
35			int directrelay = 3; /* number of source relays */
36			int vspretest = 512; /* virtual source pretest density */
37			int directvis = 1; /* sources visible? */
38			double srcsizerat = .2; /* maximum ratio source size/dist. */
39
40			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
41			COLOR salbedo = BLKCOLOR; /* global scattering albedo */
42			double seccg = 0.; /* global scattering eccentricity */
43			double ssampdist = 0.; /* scatter sampling distance */
44
45			double specthresh = .15; /* specular sampling threshold */
46			double specjitter = 1.; /* specular sampling jitter */
47
48			int backvis = 1; /* back face visibility */
49
50	greg	2.3	int maxdepth = -10; /* maximum recursion depth */
51			double minweight = 2e-3; /* minimum ray weight */
52	greg	2.1
53			char ambfile = NULL; / ambient file name */
54			COLOR ambval = BLKCOLOR; /* ambient value */
55			int ambvwt = 0; /* initial weight for ambient value */
56			double ambacc = 0; /* ambient accuracy */
57			int ambres = 256; /* ambient resolution */
58			int ambdiv = 350; /* ambient divisions */
59			int ambssamp = 0; /* ambient super-samples */
60			int ambounce = 1; /* ambient bounces */
61			char amblist[AMBLLEN+1]; / ambient include/exclude list */
62			int ambincl = -1; /* include == 1, exclude == 0 */
63
64			int account; /* current accumulation count */
65			RNUMBER raysleft; /* number of rays left to trace */
66			long waitflush; /* how long until next flush */
67
68	greg	2.4	RNUMBER lastray = 0; /* last ray number sent */
69			RNUMBER lastdone = 0; /* last ray output */
70	greg	2.1
71			static void mcfree(void p) { epfree(((MODCONT *)p).binv); free(p); }
72
73			LUTAB modconttab = LU_SINIT(NULL,mcfree); /* modifier lookup table */
74
75			/************************ INITIALIZATION ROUTINES *********************/
76
77			char *
78			formstr( /* return format identifier */
79			int f
80			)
81			{
82			switch (f) {
83			case 'a': return("ascii");
84			case 'f': return("float");
85			case 'd': return("double");
86			case 'c': return(COLRFMT);
87			}
88			return("unknown");
89			}
90
91
92			/* Add modifier to our list to track */
93			MODCONT *
94	greg	2.20	addmodifier(char modn, char outf, char prms, char binv, int bincnt)
95	greg	2.1	{
96			LUENT *lep = lu_find(&modconttab,modn);
97			MODCONT *mp;
98			EPNODE *ebinv;
99			int i;
100
101			if (lep->data != NULL) {
102			sprintf(errmsg, "duplicate modifier '%s'", modn);
103			error(USER, errmsg);
104			}
105			if (nmods >= MAXMODLIST)
106			error(INTERNAL, "too many modifiers");
107			modname[nmods++] = modn; /* XXX assumes static string */
108			lep->key = modn; /* XXX assumes static string */
109			if (binv == NULL)
110			binv = "0"; /* use single bin if unspecified */
111			ebinv = eparse(binv);
112			if (ebinv->type == NUM) { /* check value if constant */
113			bincnt = (int)(evalue(ebinv) + 1.5);
114			if (bincnt != 1) {
115			sprintf(errmsg, "illegal non-zero constant for bin (%s)",
116			binv);
117			error(USER, errmsg);
118			}
119			} else if (bincnt <= 0) {
120			sprintf(errmsg,
121			"unspecified or illegal bin count for modifier '%s'",
122			modn);
123			error(USER, errmsg);
124			}
125			/* initialize results holder */
126			mp = (MODCONT )malloc(sizeof(MODCONT)+sizeof(DCOLOR)(bincnt-1));
127			if (mp == NULL)
128			error(SYSTEM, "out of memory in addmodifier");
129			mp->outspec = outf; /* XXX assumes static string */
130			mp->modname = modn; /* XXX assumes static string */
131	greg	2.20	mp->params = prms;
132	greg	2.1	mp->binv = ebinv;
133			mp->nbins = bincnt;
134			memset(mp->cbin, 0, sizeof(DCOLOR)*bincnt);
135			/* allocate output streams */
136			for (i = bincnt; i-- > 0; )
137			getostream(mp->outspec, mp->modname, i, 1);
138			lep->data = (char *)mp;
139			return(mp);
140			}
141
142
143	greg	2.10	/* Add modifiers from a file list */
144	greg	2.1	void
145	greg	2.20	addmodfile(char fname, char outf, char prms, char binv, int bincnt)
146	greg	2.1	{
147			char *mname[MAXMODLIST];
148			int i;
149			/* find the file & store strings */
150			if (wordfile(mname, getpath(fname, getrlibpath(), R_OK)) < 0) {
151			sprintf(errmsg, "cannot find modifier file '%s'", fname);
152			error(SYSTEM, errmsg);
153			}
154			for (i = 0; mname[i]; i++) /* add each one */
155	greg	2.20	addmodifier(mname[i], outf, prms, binv, bincnt);
156	greg	2.1	}
157
158
159			void
160			quit( /* quit program */
161			int code
162			)
163			{
164			if (nchild > 0) /* close children if any */
165	greg	2.10	end_children(code != 0);
166	greg	2.1	exit(code);
167			}
168
169
170			/* Initialize our process(es) */
171			static void
172			rcinit()
173			{
174			int i;
175
176			if (nproc > MAXPROCESS)
177			sprintf(errmsg, "too many processes requested -- reducing to %d",
178			nproc = MAXPROCESS);
179	greg	2.2	if (nproc > 1) {
180			preload_objs(); /* preload auxiliary data */
181			/* set shared memory boundary */
182			shm_boundary = strcpy((char *)malloc(16), "SHM_BOUNDARY");
183			}
184	greg	2.14	for (i = 0; i < nsources; i++) /* tracing to sources as well */
185			source[i].sflags \|= SFOLLOW;
186	greg	2.1	if (yres > 0) { /* set up flushing & ray counts */
187			if (xres > 0)
188			raysleft = (RNUMBER)xres*yres;
189			else
190			raysleft = yres;
191			} else
192			raysleft = 0;
193			if ((account = accumulate) > 1)
194			raysleft *= accumulate;
195			waitflush = (yres > 0) & (xres > 1) ? 0 : xres;
196
197	greg	2.5	if (nproc > 1 && in_rchild()) /* forked child? */
198	greg	2.1	return; /* return to main processing loop */
199
200	greg	2.5	if (recover) { /* recover previous output? */
201	greg	2.8	if (accumulate <= 0)
202	greg	2.5	reload_output();
203	greg	2.8	else
204	greg	2.5	recover_output();
205			}
206			if (nproc == 1) /* single process? */
207			return;
208	greg	2.8	/* else run appropriate controller */
209			if (accumulate <= 0)
210			feeder_loop();
211			else
212			parental_loop();
213	greg	2.1	quit(0); /* parent musn't return! */
214			}
215
216			/************************ MAIN CALCULATION PROCESS *********************/
217
218	greg	2.20	/* Set parameters for current bin evaluation */
219	greg	2.22	void
220	greg	2.20	set_eparams(char *prms)
221			{
222	greg	2.22	static char *last_params = NULL;
223			char vname[RMAXWORD];
224			double value;
225			char *cpd;
226			/* check if already set */
227			if ((prms == NULL) \| (prms == last_params))
228			return;
229			if (last_params != NULL && !strcmp(prms, last_params))
230			return;
231			last_params = prms; /* assign each variable */
232			while (*prms) {
233			if (isspace(*prms)) {
234			++prms; continue;
235			}
236			if (!isalpha(*prms))
237	greg	2.20	goto bad_params;
238			cpd = vname;
239	greg	2.22	while (prms && (prms != '=') & !isspace(*prms)) {
240			if (!isid(*prms))
241	greg	2.20	goto bad_params;
242	greg	2.22	cpd++ = prms++;
243	greg	2.20	}
244			if (cpd == vname)
245			goto bad_params;
246			*cpd = '\0';
247	greg	2.22	while (isspace(*prms)) prms++;
248			if (*prms++ != '=')
249	greg	2.20	goto bad_params;
250	greg	2.22	value = atof(prms);
251			if ((prms = fskip(prms)) == NULL)
252	greg	2.20	goto bad_params;
253	greg	2.22	while (isspace(*prms)) prms++;
254			prms += (prms == ',') \| (prms == ';');
255	greg	2.20	varset(vname, '=', value);
256			}
257			return;
258			bad_params:
259	greg	2.22	sprintf(errmsg, "bad parameter list '%s'", last_params);
260	greg	2.20	error(USER, errmsg);
261			}
262
263	greg	2.22
264	greg	2.1	/* Our trace call to sum contributions */
265			static void
266			trace_contrib(RAY *r)
267			{
268			MODCONT *mp;
269	greg	2.19	double bval;
270	greg	2.1	int bn;
271			RREAL contr[3];
272
273	greg	2.6	if (r->ro == NULL \|\| r->ro->omod == OVOID)
274	greg	2.1	return;
275	greg	2.20	/* shadow ray not on source? */
276			if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
277			return;
278	greg	2.1
279			mp = (MODCONT *)lu_find(&modconttab,objptr(r->ro->omod)->oname)->data;
280
281	greg	2.6	if (mp == NULL) /* not in our list? */
282			return;
283	greg	2.1
284	greg	2.21	worldfunc(RCCONTEXT, r); /* else set context */
285	greg	2.22	set_eparams((char *)mp->params);
286	greg	2.21	if ((bval = evalue(mp->binv)) <= -.5) /* and get bin number */
287			return; /* silently ignore negatives */
288	greg	2.19	if ((bn = (int)(bval + .5)) >= mp->nbins) {
289	greg	2.23	sprintf(errmsg, "bad bin number (%d ignored)", bn);
290			error(WARNING, errmsg);
291	greg	2.1	return;
292			}
293	greg	2.14	raycontrib(contr, r, PRIMARY); /* compute coefficient */
294	greg	2.1	if (contrib)
295	greg	2.14	multcolor(contr, r->rcol); /* -> contribution */
296	greg	2.1	addcolor(mp->cbin[bn], contr);
297			}
298
299
300	greg	2.7	/* Evaluate irradiance contributions */
301	greg	2.1	static void
302	greg	2.7	eval_irrad(FVECT org, FVECT dir)
303	greg	2.1	{
304	greg	2.7	RAY thisray;
305
306			VSUM(thisray.rorg, org, dir, 1.1e-4);
307			thisray.rdir[0] = -dir[0];
308			thisray.rdir[1] = -dir[1];
309			thisray.rdir[2] = -dir[2];
310			thisray.rmax = 0.0;
311			rayorigin(&thisray, PRIMARY, NULL, NULL);
312	greg	2.16	/* pretend we hit surface */
313			thisray.rt = thisray.rot = 1e-5;
314	greg	2.7	thisray.rod = 1.0;
315	greg	2.15	VCOPY(thisray.ron, dir);
316	greg	2.7	VSUM(thisray.rop, org, dir, 1e-4);
317			samplendx++; /* compute result */
318			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
319	greg	2.1	}
320
321
322	greg	2.7	/* Evaluate radiance contributions */
323	greg	2.1	static void
324	greg	2.7	eval_rad(FVECT org, FVECT dir, double dmax)
325	greg	2.1	{
326			RAY thisray;
327			/* set up ray */
328	greg	2.7	VCOPY(thisray.rorg, org);
329			VCOPY(thisray.rdir, dir);
330			thisray.rmax = dmax;
331	greg	2.1	rayorigin(&thisray, PRIMARY, NULL, NULL);
332			samplendx++; /* call ray evaluation */
333			rayvalue(&thisray);
334			}
335
336
337			/* Accumulate and/or output ray contributions (child or only process) */
338			static void
339			done_contrib()
340			{
341			MODCONT *mp;
342			int i;
343
344			if (account <= 0 \|\| --account)
345			return; /* not time yet */
346
347			for (i = 0; i < nmods; i++) { /* output records & clear */
348			mp = (MODCONT *)lu_find(&modconttab,modname[i])->data;
349			mod_output(mp);
350			memset(mp->cbin, 0, sizeof(DCOLOR)*mp->nbins);
351			}
352			end_record(); /* end lines & flush if time */
353
354			account = accumulate; /* reset accumulation counter */
355			}
356
357
358			/* Principal calculation loop (called by main) */
359			void
360			rcontrib()
361			{
362			static int ignore_warning_given = 0;
363			FVECT orig, direc;
364			double d;
365	greg	2.2	/* initialize (& fork more of us) */
366	greg	2.1	rcinit();
367			/* load rays from stdin & process */
368			#ifdef getc_unlocked
369	greg	2.2	flockfile(stdin); /* avoid mutex overhead */
370	greg	2.1	#endif
371			while (getvec(orig) == 0 && getvec(direc) == 0) {
372			d = normalize(direc);
373	greg	2.17	if (nchild != -1 && (d == 0.0) & (accumulate == 0)) {
374	greg	2.1	if (!ignore_warning_given++)
375			error(WARNING,
376			"dummy ray(s) ignored during accumulation\n");
377			continue;
378			}
379			if (lastray+1 < lastray)
380			lastray = lastdone = 0;
381			++lastray;
382			if (d == 0.0) { /* zero ==> flush */
383	greg	2.18	if ((yres <= 0) \| (xres <= 1))
384	greg	2.17	waitflush = 1; /* flush after */
385			if (nchild == -1)
386			account = 1;
387	greg	2.7	} else if (imm_irrad) { /* else compute */
388			eval_irrad(orig, direc);
389			} else {
390			eval_rad(orig, direc, lim_dist ? d : 0.0);
391	greg	2.1	}
392			done_contrib(); /* accumulate/output */
393			++lastdone;
394			if (raysleft && !--raysleft)
395			break; /* preemptive EOI */
396			}
397	greg	2.11	if (nchild != -1 && (accumulate <= 0) \| (account < accumulate)) {
398	greg	2.1	if (account < accumulate) {
399			error(WARNING, "partial accumulation in final record");
400			accumulate -= account;
401			}
402			account = 1; /* output accumulated totals */
403			done_contrib();
404			}
405	greg	2.9	lu_done(&ofiletab); /* close output files */
406	greg	2.1	if (raysleft)
407			error(USER, "unexpected EOF on input");
408			}