src/rt/rcontrib.c

#ifndef lint
static const char RCSid[] = "$Id: rcontrib.c,v 2.32 2018/06/13 21:23:45 greg Exp $";
#endif
/*
 * Accumulate ray contributions for a set of materials
 * Initialization and calculation routines
 */

#include "copyright.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 */

void    (*trace)() = NULL;              /* trace call (NULL before rcinit) */

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

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

double  dstrsrc = 0.9;                  /* square source distribution */
double  shadthresh = 0.;                /* 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 = .02;               /* 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     trace_contrib(RAY *r);  /* our trace callback */

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) {
                sprintf(errmsg, "too many modifiers (%d limit)", MAXMODLIST);
                error(INTERNAL, errmsg);
        }
        if (!strcmp(modn, VOIDID)) {
                sprintf(errmsg, "cannot track '%s' modifier", VOIDID);
                error(USER, errmsg);
        }
        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;              /* XXX assumes static string */
        mp->binv = ebinv;
        mp->bin0 = 0;
        mp->nbins = bincnt;
        memset(mp->cbin, 0, sizeof(DCOLOR)*bincnt);
                                        /* figure out starting bin */
        while (!getostream(mp->outspec, mp->modname, mp->bin0, 1))
                mp->bin0++;
                                        /* allocate other output streams */
        for (i = 0; ++i < mp->nbins; )
                getostream(mp->outspec, mp->modname, mp->bin0+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 */
        i = wordfile(mname, MAXMODLIST, getpath(fname, getrlibpath(), R_OK));
        if (i < 0) {
                sprintf(errmsg, "cannot find modifier file '%s'", fname);
                error(SYSTEM, errmsg);
        }
        if (i >= MAXMODLIST-1) {
                sprintf(errmsg, "too many modifiers (%d limit) in file '%s'",
                                MAXMODLIST-1, fname);
                error(INTERNAL, 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(void)
{
        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");
        }
        trace = trace_contrib;          /* set up trace call-back */
        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 ***********************/

/* 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(void)
{
        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(void)
{
        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:	2.33
Committed:	Wed Jun 13 21:32:15 2018 UTC (5 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R2
Changes since 2.32:	+2 -2 lines
Log Message:	Cosmetic fix
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.33	static const char RCSid[] = "$Id: rcontrib.c,v 2.32 2018/06/13 21:23:45 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	greg	2.1	#include "rcontrib.h"
12			#include "otypes.h"
13	greg	2.14	#include "source.h"
14	greg	2.1
15	greg	2.2	char shm_boundary = NULL; / boundary of shared memory */
16
17	greg	2.1	CUBE thescene; /* our scene */
18			OBJECT nsceneobjs; /* number of objects in our scene */
19
20			int dimlist[MAXDIM]; /* sampling dimensions */
21			int ndims = 0; /* number of sampling dimensions */
22			int samplendx = 0; /* index for this sample */
23
24	greg	2.33	void (trace)() = NULL; / trace call (NULL before rcinit) */
25	greg	2.1
26			int do_irrad = 0; /* compute irradiance? */
27
28	greg	2.3	int rand_samp = 1; /* pure Monte Carlo sampling? */
29	greg	2.1
30	greg	2.8	double dstrsrc = 0.9; /* square source distribution */
31	greg	2.31	double shadthresh = 0.; /* shadow threshold */
32	greg	2.1	double shadcert = .75; /* shadow certainty */
33			int directrelay = 3; /* number of source relays */
34			int vspretest = 512; /* virtual source pretest density */
35			int directvis = 1; /* sources visible? */
36			double srcsizerat = .2; /* maximum ratio source size/dist. */
37
38			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
39			COLOR salbedo = BLKCOLOR; /* global scattering albedo */
40			double seccg = 0.; /* global scattering eccentricity */
41			double ssampdist = 0.; /* scatter sampling distance */
42
43	greg	2.30	double specthresh = .02; /* specular sampling threshold */
44	greg	2.1	double specjitter = 1.; /* specular sampling jitter */
45
46			int backvis = 1; /* back face visibility */
47
48	greg	2.3	int maxdepth = -10; /* maximum recursion depth */
49			double minweight = 2e-3; /* minimum ray weight */
50	greg	2.1
51			char ambfile = NULL; / ambient file name */
52			COLOR ambval = BLKCOLOR; /* ambient value */
53			int ambvwt = 0; /* initial weight for ambient value */
54	greg	2.31	double ambacc = 0.; /* ambient accuracy */
55	greg	2.1	int ambres = 256; /* ambient resolution */
56			int ambdiv = 350; /* ambient divisions */
57			int ambssamp = 0; /* ambient super-samples */
58			int ambounce = 1; /* ambient bounces */
59			char amblist[AMBLLEN+1]; / ambient include/exclude list */
60			int ambincl = -1; /* include == 1, exclude == 0 */
61
62			int account; /* current accumulation count */
63			RNUMBER raysleft; /* number of rays left to trace */
64			long waitflush; /* how long until next flush */
65
66	greg	2.4	RNUMBER lastray = 0; /* last ray number sent */
67			RNUMBER lastdone = 0; /* last ray output */
68	greg	2.1
69	greg	2.32	static void trace_contrib(RAY r); / our trace callback */
70
71	greg	2.1	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	greg	2.27	if (nmods >= MAXMODLIST) {
106			sprintf(errmsg, "too many modifiers (%d limit)", MAXMODLIST);
107			error(INTERNAL, errmsg);
108			}
109	greg	2.26	if (!strcmp(modn, VOIDID)) {
110			sprintf(errmsg, "cannot track '%s' modifier", VOIDID);
111			error(USER, errmsg);
112			}
113	greg	2.1	modname[nmods++] = modn; /* XXX assumes static string */
114			lep->key = modn; /* XXX assumes static string */
115			if (binv == NULL)
116			binv = "0"; /* use single bin if unspecified */
117			ebinv = eparse(binv);
118			if (ebinv->type == NUM) { /* check value if constant */
119			bincnt = (int)(evalue(ebinv) + 1.5);
120			if (bincnt != 1) {
121			sprintf(errmsg, "illegal non-zero constant for bin (%s)",
122			binv);
123			error(USER, errmsg);
124			}
125			} else if (bincnt <= 0) {
126			sprintf(errmsg,
127			"unspecified or illegal bin count for modifier '%s'",
128			modn);
129			error(USER, errmsg);
130			}
131			/* initialize results holder */
132			mp = (MODCONT )malloc(sizeof(MODCONT)+sizeof(DCOLOR)(bincnt-1));
133			if (mp == NULL)
134			error(SYSTEM, "out of memory in addmodifier");
135			mp->outspec = outf; /* XXX assumes static string */
136			mp->modname = modn; /* XXX assumes static string */
137	greg	2.28	mp->params = prms; /* XXX assumes static string */
138	greg	2.1	mp->binv = ebinv;
139	greg	2.29	mp->bin0 = 0;
140	greg	2.1	mp->nbins = bincnt;
141			memset(mp->cbin, 0, sizeof(DCOLOR)*bincnt);
142	greg	2.29	/* figure out starting bin */
143			while (!getostream(mp->outspec, mp->modname, mp->bin0, 1))
144			mp->bin0++;
145			/* allocate other output streams */
146			for (i = 0; ++i < mp->nbins; )
147			getostream(mp->outspec, mp->modname, mp->bin0+i, 1);
148	greg	2.1	lep->data = (char *)mp;
149			return(mp);
150			}
151
152
153	greg	2.10	/* Add modifiers from a file list */
154	greg	2.1	void
155	greg	2.20	addmodfile(char fname, char outf, char prms, char binv, int bincnt)
156	greg	2.1	{
157			char *mname[MAXMODLIST];
158			int i;
159			/* find the file & store strings */
160	greg	2.27	i = wordfile(mname, MAXMODLIST, getpath(fname, getrlibpath(), R_OK));
161			if (i < 0) {
162	greg	2.1	sprintf(errmsg, "cannot find modifier file '%s'", fname);
163			error(SYSTEM, errmsg);
164			}
165	greg	2.27	if (i >= MAXMODLIST-1) {
166			sprintf(errmsg, "too many modifiers (%d limit) in file '%s'",
167			MAXMODLIST-1, fname);
168			error(INTERNAL, errmsg);
169			}
170	greg	2.1	for (i = 0; mname[i]; i++) /* add each one */
171	greg	2.20	addmodifier(mname[i], outf, prms, binv, bincnt);
172	greg	2.1	}
173
174
175			void
176			quit( /* quit program */
177			int code
178			)
179			{
180			if (nchild > 0) /* close children if any */
181	greg	2.10	end_children(code != 0);
182	greg	2.1	exit(code);
183			}
184
185
186			/* Initialize our process(es) */
187			static void
188	greg	2.28	rcinit(void)
189	greg	2.1	{
190			int i;
191
192			if (nproc > MAXPROCESS)
193			sprintf(errmsg, "too many processes requested -- reducing to %d",
194			nproc = MAXPROCESS);
195	greg	2.2	if (nproc > 1) {
196			preload_objs(); /* preload auxiliary data */
197			/* set shared memory boundary */
198			shm_boundary = strcpy((char *)malloc(16), "SHM_BOUNDARY");
199			}
200	greg	2.32	trace = trace_contrib; /* set up trace call-back */
201	greg	2.14	for (i = 0; i < nsources; i++) /* tracing to sources as well */
202			source[i].sflags \|= SFOLLOW;
203	greg	2.1	if (yres > 0) { /* set up flushing & ray counts */
204			if (xres > 0)
205			raysleft = (RNUMBER)xres*yres;
206			else
207			raysleft = yres;
208			} else
209			raysleft = 0;
210			if ((account = accumulate) > 1)
211			raysleft *= accumulate;
212			waitflush = (yres > 0) & (xres > 1) ? 0 : xres;
213
214	greg	2.5	if (nproc > 1 && in_rchild()) /* forked child? */
215	greg	2.1	return; /* return to main processing loop */
216
217	greg	2.5	if (recover) { /* recover previous output? */
218	greg	2.8	if (accumulate <= 0)
219	greg	2.5	reload_output();
220	greg	2.8	else
221	greg	2.5	recover_output();
222			}
223			if (nproc == 1) /* single process? */
224			return;
225	greg	2.8	/* else run appropriate controller */
226			if (accumulate <= 0)
227			feeder_loop();
228			else
229			parental_loop();
230	greg	2.1	quit(0); /* parent musn't return! */
231			}
232
233			/************************ MAIN CALCULATION PROCESS *********************/
234
235			/* Our trace call to sum contributions */
236			static void
237			trace_contrib(RAY *r)
238			{
239			MODCONT *mp;
240	greg	2.19	double bval;
241	greg	2.1	int bn;
242			RREAL contr[3];
243
244	greg	2.6	if (r->ro == NULL \|\| r->ro->omod == OVOID)
245	greg	2.1	return;
246	greg	2.20	/* shadow ray not on source? */
247			if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
248			return;
249	greg	2.1
250			mp = (MODCONT *)lu_find(&modconttab,objptr(r->ro->omod)->oname)->data;
251
252	greg	2.6	if (mp == NULL) /* not in our list? */
253			return;
254	greg	2.1
255	greg	2.21	worldfunc(RCCONTEXT, r); /* else set context */
256	greg	2.22	set_eparams((char *)mp->params);
257	greg	2.21	if ((bval = evalue(mp->binv)) <= -.5) /* and get bin number */
258			return; /* silently ignore negatives */
259	greg	2.19	if ((bn = (int)(bval + .5)) >= mp->nbins) {
260	greg	2.23	sprintf(errmsg, "bad bin number (%d ignored)", bn);
261			error(WARNING, errmsg);
262	greg	2.1	return;
263			}
264	greg	2.14	raycontrib(contr, r, PRIMARY); /* compute coefficient */
265	greg	2.1	if (contrib)
266	greg	2.14	multcolor(contr, r->rcol); /* -> contribution */
267	greg	2.1	addcolor(mp->cbin[bn], contr);
268			}
269
270
271	greg	2.7	/* Evaluate irradiance contributions */
272	greg	2.1	static void
273	greg	2.7	eval_irrad(FVECT org, FVECT dir)
274	greg	2.1	{
275	greg	2.7	RAY thisray;
276
277			VSUM(thisray.rorg, org, dir, 1.1e-4);
278			thisray.rdir[0] = -dir[0];
279			thisray.rdir[1] = -dir[1];
280			thisray.rdir[2] = -dir[2];
281			thisray.rmax = 0.0;
282			rayorigin(&thisray, PRIMARY, NULL, NULL);
283	greg	2.16	/* pretend we hit surface */
284			thisray.rt = thisray.rot = 1e-5;
285	greg	2.7	thisray.rod = 1.0;
286	greg	2.15	VCOPY(thisray.ron, dir);
287	greg	2.7	VSUM(thisray.rop, org, dir, 1e-4);
288			samplendx++; /* compute result */
289			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
290	greg	2.1	}
291
292
293	greg	2.7	/* Evaluate radiance contributions */
294	greg	2.1	static void
295	greg	2.7	eval_rad(FVECT org, FVECT dir, double dmax)
296	greg	2.1	{
297			RAY thisray;
298			/* set up ray */
299	greg	2.7	VCOPY(thisray.rorg, org);
300			VCOPY(thisray.rdir, dir);
301			thisray.rmax = dmax;
302	greg	2.1	rayorigin(&thisray, PRIMARY, NULL, NULL);
303			samplendx++; /* call ray evaluation */
304			rayvalue(&thisray);
305			}
306
307
308			/* Accumulate and/or output ray contributions (child or only process) */
309			static void
310	greg	2.28	done_contrib(void)
311	greg	2.1	{
312			MODCONT *mp;
313			int i;
314
315			if (account <= 0 \|\| --account)
316			return; /* not time yet */
317
318			for (i = 0; i < nmods; i++) { /* output records & clear */
319			mp = (MODCONT *)lu_find(&modconttab,modname[i])->data;
320			mod_output(mp);
321			memset(mp->cbin, 0, sizeof(DCOLOR)*mp->nbins);
322			}
323			end_record(); /* end lines & flush if time */
324
325			account = accumulate; /* reset accumulation counter */
326			}
327
328
329			/* Principal calculation loop (called by main) */
330			void
331	greg	2.28	rcontrib(void)
332	greg	2.1	{
333			static int ignore_warning_given = 0;
334			FVECT orig, direc;
335			double d;
336	greg	2.2	/* initialize (& fork more of us) */
337	greg	2.1	rcinit();
338			/* load rays from stdin & process */
339			#ifdef getc_unlocked
340	greg	2.2	flockfile(stdin); /* avoid mutex overhead */
341	greg	2.1	#endif
342			while (getvec(orig) == 0 && getvec(direc) == 0) {
343			d = normalize(direc);
344	greg	2.17	if (nchild != -1 && (d == 0.0) & (accumulate == 0)) {
345	greg	2.1	if (!ignore_warning_given++)
346			error(WARNING,
347			"dummy ray(s) ignored during accumulation\n");
348			continue;
349			}
350			if (lastray+1 < lastray)
351			lastray = lastdone = 0;
352			++lastray;
353			if (d == 0.0) { /* zero ==> flush */
354	greg	2.18	if ((yres <= 0) \| (xres <= 1))
355	greg	2.17	waitflush = 1; /* flush after */
356			if (nchild == -1)
357			account = 1;
358	greg	2.7	} else if (imm_irrad) { /* else compute */
359			eval_irrad(orig, direc);
360			} else {
361			eval_rad(orig, direc, lim_dist ? d : 0.0);
362	greg	2.1	}
363			done_contrib(); /* accumulate/output */
364			++lastdone;
365			if (raysleft && !--raysleft)
366			break; /* preemptive EOI */
367			}
368	greg	2.11	if (nchild != -1 && (accumulate <= 0) \| (account < accumulate)) {
369	greg	2.1	if (account < accumulate) {
370			error(WARNING, "partial accumulation in final record");
371			accumulate -= account;
372			}
373			account = 1; /* output accumulated totals */
374			done_contrib();
375			}
376	greg	2.9	lu_done(&ofiletab); /* close output files */
377	greg	2.1	if (raysleft)
378			error(USER, "unexpected EOF on input");
379			}