src/rt/rtrace.c

#ifndef lint
static const char       RCSid[] = "$Id: rtrace.c,v 2.71 2018/02/13 20:27:19 greg Exp $";
#endif
/*
 *  rtrace.c - program and variables for individual ray tracing.
 */

#include "copyright.h"

/*
 *  Input is in the form:
 *
 *      xorg    yorg    zorg    xdir    ydir    zdir
 *
 *  The direction need not be normalized.  Output is flexible.
 *  If the direction vector is (0,0,0), then the output is flushed.
 *  All values default to ascii representation of real
 *  numbers.  Binary representations can be selected
 *  with '-ff' for float or '-fd' for double.  By default,
 *  radiance is computed.  The '-i' or '-I' options indicate that
 *  irradiance values are desired.
 */

#include  <time.h>

#include  "platform.h"
#include  "ray.h"
#include  "ambient.h"
#include  "source.h"
#include  "otypes.h"
#include  "otspecial.h"
#include  "resolu.h"
#include  "random.h"

extern int  inform;                     /* input format */
extern int  outform;                    /* output format */
extern char  *outvals;                  /* output values */

extern int  imm_irrad;                  /* compute immediate irradiance? */
extern int  lim_dist;                   /* limit distance? */

extern char  *tralist[];                /* list of modifers to trace (or no) */
extern int  traincl;                    /* include == 1, exclude == 0 */

extern int  hresolu;                    /* horizontal resolution */
extern int  vresolu;                    /* vertical resolution */

static int  castonly = 0;

#ifndef  MAXTSET
#define  MAXTSET        8191            /* maximum number in trace set */
#endif
OBJECT  traset[MAXTSET+1]={0};          /* trace include/exclude set */

static RAY  thisray;                    /* for our convenience */

typedef void putf_t(RREAL *v, int n);
static putf_t puta, putd, putf;

typedef void oputf_t(RAY *r);
static oputf_t  oputo, oputd, oputv, oputV, oputl, oputL, oputc, oputp,
                oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde;

static void setoutput(char *vs);
extern void tranotify(OBJECT obj);
static void bogusray(void);
static void raycast(RAY *r);
static void rayirrad(RAY *r);
static void rtcompute(FVECT org, FVECT dir, double dmax);
static int printvals(RAY *r);
static int getvec(FVECT vec, int fmt, FILE *fp);
static void tabin(RAY *r);
static void ourtrace(RAY *r);

static oputf_t *ray_out[16], *every_out[16];
static putf_t *putreal;


void
quit(                   /* quit program */
        int  code
)
{
        if (ray_pnprocs > 0)    /* close children if any */
                ray_pclose(0);          
#ifndef  NON_POSIX
        else if (!ray_pnprocs) {
                headclean();    /* delete header file */
                pfclean();      /* clean up persist files */
        }
#endif
        exit(code);
}


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");
}


extern void
rtrace(                         /* trace rays from file */
        char  *fname,
        int  nproc
)
{
        unsigned long  vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu
                                              : (unsigned long)vresolu;
        long  nextflush = (vresolu > 0) & (hresolu > 1) ? 0 : hresolu;
        FILE  *fp;
        double  d;
        FVECT  orig, direc;
                                        /* set up input */
        if (fname == NULL)
                fp = stdin;
        else if ((fp = fopen(fname, "r")) == NULL) {
                sprintf(errmsg, "cannot open input file \"%s\"", fname);
                error(SYSTEM, errmsg);
        }
        if (inform != 'a')
                SET_FILE_BINARY(fp);
                                        /* set up output */
        setoutput(outvals);
        if (imm_irrad)
                castonly = 0;
        else if (castonly)
                nproc = 1;              /* don't bother multiprocessing */
        switch (outform) {
        case 'a': putreal = puta; break;
        case 'f': putreal = putf; break;
        case 'd': putreal = putd; break;
        case 'c': 
                if (strcmp(outvals, "v"))
                        error(USER, "color format with value output only");
                break;
        default:
                error(CONSISTENCY, "botched output format");
        }
        if (nproc > 1) {                /* start multiprocessing */
                ray_popen(nproc);
                ray_fifo_out = printvals;
        }
        if (hresolu > 0) {
                if (vresolu > 0)
                        fprtresolu(hresolu, vresolu, stdout);
                fflush(stdout);
        }
                                        /* process file */
        while (getvec(orig, inform, fp) == 0 &&
                        getvec(direc, inform, fp) == 0) {

                d = normalize(direc);
                if (d == 0.0) {                         /* zero ==> flush */
                        if (--nextflush <= 0 || !vcount) {
                                if (nproc > 1 && ray_fifo_flush() < 0)
                                        error(USER, "child(ren) died");
                                bogusray();
                                fflush(stdout);
                                nextflush = (vresolu > 0) & (hresolu > 1) ? 0 :
                                                                hresolu;
                        } else
                                bogusray();
                } else {                                /* compute and print */
                        rtcompute(orig, direc, lim_dist ? d : 0.0);
                                                        /* flush if time */
                        if (!--nextflush) {
                                if (nproc > 1 && ray_fifo_flush() < 0)
                                        error(USER, "child(ren) died");
                                fflush(stdout);
                                nextflush = hresolu;
                        }
                }
                if (ferror(stdout))
                        error(SYSTEM, "write error");
                if (vcount && !--vcount)                /* check for end */
                        break;
        }
        if (nproc > 1) {                                /* clean up children */
                if (ray_fifo_flush() < 0)
                        error(USER, "unable to complete processing");
                ray_pclose(0);
        }
        if (fflush(stdout) < 0)
                error(SYSTEM, "write error");
        if (vcount)
                error(USER, "unexpected EOF on input");
        if (fname != NULL)
                fclose(fp);
}


static void
trace_sources(void)                     /* trace rays to light sources, also */
{
        int     sn;
        
        for (sn = 0; sn < nsources; sn++)
                source[sn].sflags |= SFOLLOW;
}


static void
setoutput(                              /* set up output tables */
        char  *vs
)
{
        oputf_t **table = ray_out;

        castonly = 1;
        while (*vs)
                switch (*vs++) {
                case 'T':                               /* trace sources */
                        if (!*vs) break;
                        trace_sources();
                        /* fall through */
                case 't':                               /* trace */
                        if (!*vs) break;
                        *table = NULL;
                        table = every_out;
                        trace = ourtrace;
                        castonly = 0;
                        break;
                case 'o':                               /* origin */
                        *table++ = oputo;
                        break;
                case 'd':                               /* direction */
                        *table++ = oputd;
                        break;
                case 'v':                               /* value */
                        *table++ = oputv;
                        castonly = 0;
                        break;
                case 'V':                               /* contribution */
                        *table++ = oputV;
                        if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0))
                                error(WARNING,
                                        "-otV accuracy depends on -aa 0 -as 0");
                        break;
                case 'l':                               /* effective distance */
                        *table++ = oputl;
                        castonly = 0;
                        break;
                case 'c':                               /* local coordinates */
                        *table++ = oputc;
                        break;
                case 'L':                               /* single ray length */
                        *table++ = oputL;
                        break;
                case 'p':                               /* point */
                        *table++ = oputp;
                        break;
                case 'n':                               /* perturbed normal */
                        *table++ = oputn;
                        castonly = 0;
                        break;
                case 'N':                               /* unperturbed normal */
                        *table++ = oputN;
                        break;
                case 's':                               /* surface */
                        *table++ = oputs;
                        break;
                case 'w':                               /* weight */
                        *table++ = oputw;
                        break;
                case 'W':                               /* coefficient */
                        *table++ = oputW;
                        if (ambounce > 0 && (ambacc > FTINY || ambssamp > 0))
                                error(WARNING,
                                        "-otW accuracy depends on -aa 0 -as 0");
                        break;
                case 'm':                               /* modifier */
                        *table++ = oputm;
                        break;
                case 'M':                               /* material */
                        *table++ = oputM;
                        break;
                case '~':                               /* tilde */
                        *table++ = oputtilde;
                        break;
                }
        *table = NULL;
}


static void
bogusray(void)                  /* print out empty record */
{
        thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
        thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
        thisray.rmax = 0.0;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
        printvals(&thisray);
}


static void
raycast(                        /* compute first ray intersection only */
        RAY *r
)
{
        if (!localhit(r, &thescene)) {
                if (r->ro == &Aftplane) {       /* clipped */
                        r->ro = NULL;
                        r->rot = FHUGE;
                } else
                        sourcehit(r);
        }
}


static void
rayirrad(                       /* compute irradiance rather than radiance */
        RAY *r
)
{
        void    (*old_revf)(RAY *) = r->revf;

        r->rot = 1e-5;                  /* pretend we hit surface */
        VSUM(r->rop, r->rorg, r->rdir, r->rot);
        r->ron[0] = -r->rdir[0];
        r->ron[1] = -r->rdir[1];
        r->ron[2] = -r->rdir[2];
        r->rod = 1.0;
                                        /* compute result */
        r->revf = raytrace;
        (*ofun[Lamb.otype].funp)(&Lamb, r);
        r->revf = old_revf;
}


static void
rtcompute(                      /* compute and print ray value(s) */
        FVECT  org,
        FVECT  dir,
        double  dmax
)
{
                                        /* set up ray */
        rayorigin(&thisray, PRIMARY, NULL, NULL);
        if (imm_irrad) {
                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;
                thisray.revf = rayirrad;
        } else {
                VCOPY(thisray.rorg, org);
                VCOPY(thisray.rdir, dir);
                thisray.rmax = dmax;
                if (castonly)
                        thisray.revf = raycast;
        }
        if (ray_pnprocs > 1) {          /* multiprocessing FIFO? */
                if (ray_fifo_in(&thisray) < 0)
                        error(USER, "lost children");
                return;
        }
        samplendx++;                    /* else do it ourselves */
        rayvalue(&thisray);
        printvals(&thisray);
}


static int
printvals(                      /* print requested ray values */
        RAY  *r
)
{
        oputf_t **tp;

        if (ray_out[0] == NULL)
                return(0);
        for (tp = ray_out; *tp != NULL; tp++)
                (**tp)(r);
        if (outform == 'a')
                putchar('\n');
        return(1);
}


static int
getvec(         /* get a vector from fp */
        FVECT  vec,
        int  fmt,
        FILE  *fp
)
{
        static float  vf[3];
        static double  vd[3];
        char  buf[32];
        int  i;

        switch (fmt) {
        case 'a':                                       /* ascii */
                for (i = 0; i < 3; i++) {
                        if (fgetword(buf, sizeof(buf), fp) == NULL ||
                                        !isflt(buf))
                                return(-1);
                        vec[i] = atof(buf);
                }
                break;
        case 'f':                                       /* binary float */
                if (getbinary(vf, sizeof(float), 3, fp) != 3)
                        return(-1);
                VCOPY(vec, vf);
                break;
        case 'd':                                       /* binary double */
                if (getbinary(vd, sizeof(double), 3, fp) != 3)
                        return(-1);
                VCOPY(vec, vd);
                break;
        default:
                error(CONSISTENCY, "botched input format");
        }
        return(0);
}


void
tranotify(                      /* record new modifier */
        OBJECT  obj
)
{
        static int  hitlimit = 0;
        OBJREC   *o = objptr(obj);
        char  **tralp;

        if (obj == OVOID) {             /* starting over */
                traset[0] = 0;
                hitlimit = 0;
                return;
        }
        if (hitlimit || !ismodifier(o->otype))
                return;
        for (tralp = tralist; *tralp != NULL; tralp++)
                if (!strcmp(o->oname, *tralp)) {
                        if (traset[0] >= MAXTSET) {
                                error(WARNING, "too many modifiers in trace list");
                                hitlimit++;
                                return;         /* should this be fatal? */
                        }
                        insertelem(traset, obj);
                        return;
                }
}


static void
ourtrace(                               /* print ray values */
        RAY  *r
)
{
        oputf_t **tp;

        if (every_out[0] == NULL)
                return;
        if (r->ro == NULL) {
                if (traincl == 1)
                        return;
        } else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
                return;
        tabin(r);
        for (tp = every_out; *tp != NULL; tp++)
                (**tp)(r);
        if (outform == 'a')
                putchar('\n');
}


static void
tabin(                          /* tab in appropriate amount */
        RAY  *r
)
{
        const RAY  *rp;

        for (rp = r->parent; rp != NULL; rp = rp->parent)
                putchar('\t');
}


static void
oputo(                          /* print origin */
        RAY  *r
)
{
        (*putreal)(r->rorg, 3);
}


static void
oputd(                          /* print direction */
        RAY  *r
)
{
        (*putreal)(r->rdir, 3);
}


static void
oputv(                          /* print value */
        RAY  *r
)
{
        RREAL   cval[3];

        if (outform == 'c') {
                COLR  cout;
                setcolr(cout,   colval(r->rcol,RED),
                                colval(r->rcol,GRN),
                                colval(r->rcol,BLU));
                putbinary(cout, sizeof(cout), 1, stdout);
                return;
        }
        cval[0] = colval(r->rcol,RED);
        cval[1] = colval(r->rcol,GRN);
        cval[2] = colval(r->rcol,BLU);
        (*putreal)(cval, 3);
}


static void
oputV(                          /* print value contribution */
        RAY *r
)
{
        RREAL   contr[3];

        raycontrib(contr, r, PRIMARY);
        multcolor(contr, r->rcol);
        (*putreal)(contr, 3);
}


static void
oputl(                          /* print effective distance */
        RAY  *r
)
{
        (*putreal)(&r->rt, 1);
}


static void
oputL(                          /* print single ray length */
        RAY  *r
)
{
        (*putreal)(&r->rot, 1);
}


static void
oputc(                          /* print local coordinates */
        RAY  *r
)
{
        (*putreal)(r->uv, 2);
}


static RREAL    vdummy[3] = {0.0, 0.0, 0.0};


static void
oputp(                          /* print point */
        RAY  *r
)
{
        if (r->rot < FHUGE)
                (*putreal)(r->rop, 3);
        else
                (*putreal)(vdummy, 3);
}


static void
oputN(                          /* print unperturbed normal */
        RAY  *r
)
{
        if (r->rot < FHUGE)
                (*putreal)(r->ron, 3);
        else
                (*putreal)(vdummy, 3);
}


static void
oputn(                          /* print perturbed normal */
        RAY  *r
)
{
        FVECT  pnorm;

        if (r->rot >= FHUGE) {
                (*putreal)(vdummy, 3);
                return;
        }
        raynormal(pnorm, r);
        (*putreal)(pnorm, 3);
}


static void
oputs(                          /* print name */
        RAY  *r
)
{
        if (r->ro != NULL)
                fputs(r->ro->oname, stdout);
        else
                putchar('*');
        putchar('\t');
}


static void
oputw(                          /* print weight */
        RAY  *r
)
{
        RREAL   rwt = r->rweight;
        
        (*putreal)(&rwt, 1);
}


static void
oputW(                          /* print coefficient */
        RAY  *r
)
{
        RREAL   contr[3];
                                /* shadow ray not on source? */
        if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
                setcolor(contr, 0.0, 0.0, 0.0);
        else
                raycontrib(contr, r, PRIMARY);

        (*putreal)(contr, 3);
}


static void
oputm(                          /* print modifier */
        RAY  *r
)
{
        if (r->ro != NULL)
                if (r->ro->omod != OVOID)
                        fputs(objptr(r->ro->omod)->oname, stdout);
                else
                        fputs(VOIDID, stdout);
        else
                putchar('*');
        putchar('\t');
}


static void
oputM(                          /* print material */
        RAY  *r
)
{
        OBJREC  *mat;

        if (r->ro != NULL) {
                if ((mat = findmaterial(r->ro)) != NULL)
                        fputs(mat->oname, stdout);
                else
                        fputs(VOIDID, stdout);
        } else
                putchar('*');
        putchar('\t');
}


static void
oputtilde(                      /* output tilde (spacer) */
        RAY  *r
)
{
        fputs("~\t", stdout);
}


static void
puta(                           /* print ascii value(s) */
        RREAL *v, int n
)
{
        if (n == 3) {
                printf("%e\t%e\t%e\t", v[0], v[1], v[2]);
                return;
        }
        while (n--)
                printf("%e\t", *v++);
}


static void
putd(RREAL *v, int n)           /* print binary double(s) */
{
#ifdef  SMLFLT
        double  da[3];
        int     i;

        if (n > 3)
                error(INTERNAL, "code error in putd()");
        for (i = n; i--; )
                da[i] = v[i];
        putbinary(da, sizeof(double), n, stdout);
#else
        putbinary(v, sizeof(RREAL), n, stdout);
#endif
}


static void
putf(RREAL *v, int n)           /* print binary float(s) */
{
#ifndef SMLFLT
        float   fa[3];
        int     i;

        if (n > 3)
                error(INTERNAL, "code error in putf()");
        for (i = n; i--; )
                fa[i] = v[i];
        putbinary(fa, sizeof(float), n, stdout);
#else
        putbinary(v, sizeof(RREAL), n, stdout);
#endif
}
Revision:	2.72
Committed:	Thu Nov 8 00:54:07 2018 UTC (6 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.71:	+2 -1 lines
Log Message:	Moved findmaterial() from source.c to initotypes.c
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.72	static const char RCSid[] = "$Id: rtrace.c,v 2.71 2018/02/13 20:27:19 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* rtrace.c - program and variables for individual ray tracing.
6	greg	2.27	*/
7
8	greg	2.28	#include "copyright.h"
9	greg	1.1
10			/*
11			* Input is in the form:
12			*
13			* xorg yorg zorg xdir ydir zdir
14			*
15			* The direction need not be normalized. Output is flexible.
16	greg	1.7	* If the direction vector is (0,0,0), then the output is flushed.
17	greg	1.1	* All values default to ascii representation of real
18			* numbers. Binary representations can be selected
19			* with '-ff' for float or '-fd' for double. By default,
20	greg	1.13	* radiance is computed. The '-i' or '-I' options indicate that
21	greg	1.1	* irradiance values are desired.
22			*/
23	greg	2.32
24			#include <time.h>
25	greg	1.1
26	schorsch	2.30	#include "platform.h"
27	greg	1.1	#include "ray.h"
28	schorsch	2.37	#include "ambient.h"
29			#include "source.h"
30	greg	1.1	#include "otypes.h"
31	greg	2.72	#include "otspecial.h"
32	greg	2.6	#include "resolu.h"
33	schorsch	2.49	#include "random.h"
34	greg	2.6
35	greg	2.57	extern int inform; /* input format */
36			extern int outform; /* output format */
37			extern char outvals; / output values */
38	greg	2.27
39	greg	2.57	extern int imm_irrad; /* compute immediate irradiance? */
40			extern int lim_dist; /* limit distance? */
41	greg	1.14
42	greg	2.57	extern char tralist[]; / list of modifers to trace (or no) */
43			extern int traincl; /* include == 1, exclude == 0 */
44	greg	1.13
45	greg	2.57	extern int hresolu; /* horizontal resolution */
46			extern int vresolu; /* vertical resolution */
47	greg	1.1
48	greg	2.57	static int castonly = 0;
49	greg	2.55
50	greg	2.46	#ifndef MAXTSET
51	greg	2.55	#define MAXTSET 8191 /* maximum number in trace set */
52	greg	2.46	#endif
53	greg	2.15	OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */
54
55	greg	1.1	static RAY thisray; /* for our convenience */
56
57	greg	2.65	typedef void putf_t(RREAL *v, int n);
58	schorsch	2.37	static putf_t puta, putd, putf;
59	greg	1.1
60	schorsch	2.37	typedef void oputf_t(RAY *r);
61	greg	2.51	static oputf_t oputo, oputd, oputv, oputV, oputl, oputL, oputc, oputp,
62	greg	2.42	oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde;
63	schorsch	2.37
64			static void setoutput(char *vs);
65	greg	2.57	extern void tranotify(OBJECT obj);
66	schorsch	2.37	static void bogusray(void);
67	greg	2.59	static void raycast(RAY *r);
68			static void rayirrad(RAY *r);
69			static void rtcompute(FVECT org, FVECT dir, double dmax);
70	greg	2.57	static int printvals(RAY *r);
71			static int getvec(FVECT vec, int fmt, FILE *fp);
72			static void tabin(RAY *r);
73			static void ourtrace(RAY *r);
74	greg	1.1
75	schorsch	2.37	static oputf_t ray_out[16], every_out[16];
76			static putf_t *putreal;
77	greg	2.27
78	greg	1.1
79	greg	2.27	void
80	schorsch	2.37	quit( /* quit program */
81			int code
82			)
83	greg	1.1	{
84	greg	2.57	if (ray_pnprocs > 0) /* close children if any */
85			ray_pclose(0);
86			#ifndef NON_POSIX
87	greg	2.58	else if (!ray_pnprocs) {
88			headclean(); /* delete header file */
89			pfclean(); /* clean up persist files */
90			}
91	greg	2.11	#endif
92	greg	1.1	exit(code);
93			}
94
95
96	greg	2.57	char *
97	schorsch	2.37	formstr( /* return format identifier */
98			int f
99			)
100	greg	2.6	{
101			switch (f) {
102			case 'a': return("ascii");
103			case 'f': return("float");
104			case 'd': return("double");
105			case 'c': return(COLRFMT);
106			}
107			return("unknown");
108			}
109
110
111	schorsch	2.37	extern void
112			rtrace( /* trace rays from file */
113	greg	2.59	char *fname,
114			int nproc
115	schorsch	2.37	)
116	greg	1.1	{
117	greg	2.45	unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu
118	greg	2.66	: (unsigned long)vresolu;
119	greg	2.64	long nextflush = (vresolu > 0) & (hresolu > 1) ? 0 : hresolu;
120	greg	1.1	FILE *fp;
121	gregl	2.25	double d;
122	greg	1.2	FVECT orig, direc;
123	greg	1.1	/* set up input */
124			if (fname == NULL)
125			fp = stdin;
126			else if ((fp = fopen(fname, "r")) == NULL) {
127			sprintf(errmsg, "cannot open input file \"%s\"", fname);
128			error(SYSTEM, errmsg);
129			}
130	greg	2.8	if (inform != 'a')
131	schorsch	2.30	SET_FILE_BINARY(fp);
132	greg	1.1	/* set up output */
133	greg	2.16	setoutput(outvals);
134	greg	2.59	if (imm_irrad)
135			castonly = 0;
136			else if (castonly)
137			nproc = 1; /* don't bother multiprocessing */
138	greg	1.1	switch (outform) {
139			case 'a': putreal = puta; break;
140			case 'f': putreal = putf; break;
141			case 'd': putreal = putd; break;
142	greg	2.6	case 'c':
143			if (strcmp(outvals, "v"))
144			error(USER, "color format with value output only");
145			break;
146			default:
147			error(CONSISTENCY, "botched output format");
148	greg	1.1	}
149	greg	2.59	if (nproc > 1) { /* start multiprocessing */
150			ray_popen(nproc);
151	greg	2.58	ray_fifo_out = printvals;
152	greg	2.59	}
153	greg	2.12	if (hresolu > 0) {
154			if (vresolu > 0)
155			fprtresolu(hresolu, vresolu, stdout);
156			fflush(stdout);
157			}
158	greg	1.1	/* process file */
159			while (getvec(orig, inform, fp) == 0 &&
160			getvec(direc, inform, fp) == 0) {
161
162	gregl	2.25	d = normalize(direc);
163			if (d == 0.0) { /* zero ==> flush */
164	greg	2.45	if (--nextflush <= 0 \|\| !vcount) {
165	greg	2.63	if (nproc > 1 && ray_fifo_flush() < 0)
166	greg	2.71	error(USER, "child(ren) died");
167	greg	2.63	bogusray();
168	gregl	2.24	fflush(stdout);
169	greg	2.64	nextflush = (vresolu > 0) & (hresolu > 1) ? 0 :
170			hresolu;
171	greg	2.63	} else
172			bogusray();
173	greg	2.57	} else { /* compute and print */
174	greg	2.59	rtcompute(orig, direc, lim_dist ? d : 0.0);
175	greg	1.7	/* flush if time */
176	greg	2.45	if (!--nextflush) {
177	greg	2.59	if (nproc > 1 && ray_fifo_flush() < 0)
178	greg	2.71	error(USER, "child(ren) died");
179	gregl	2.24	fflush(stdout);
180			nextflush = hresolu;
181			}
182	greg	1.1	}
183			if (ferror(stdout))
184			error(SYSTEM, "write error");
185	greg	2.45	if (vcount && !--vcount) /* check for end */
186	greg	1.1	break;
187			}
188	greg	2.59	if (nproc > 1) { /* clean up children */
189			if (ray_fifo_flush() < 0)
190			error(USER, "unable to complete processing");
191			ray_pclose(0);
192			}
193	greg	2.50	if (fflush(stdout) < 0)
194			error(SYSTEM, "write error");
195	greg	2.45	if (vcount)
196	greg	2.42	error(USER, "unexpected EOF on input");
197	greg	2.12	if (fname != NULL)
198			fclose(fp);
199	greg	1.1	}
200
201
202	schorsch	2.37	static void
203	greg	2.40	trace_sources(void) /* trace rays to light sources, also */
204			{
205			int sn;
206
207			for (sn = 0; sn < nsources; sn++)
208			source[sn].sflags \|= SFOLLOW;
209			}
210
211
212			static void
213	schorsch	2.37	setoutput( /* set up output tables */
214	greg	2.56	char *vs
215	schorsch	2.37	)
216	greg	1.1	{
217	greg	2.56	oputf_t **table = ray_out;
218	greg	1.1
219	greg	1.11	castonly = 1;
220	greg	1.1	while (*vs)
221			switch (*vs++) {
222	greg	2.40	case 'T': /* trace sources */
223	greg	2.42	if (!*vs) break;
224	greg	2.40	trace_sources();
225			/* fall through */
226	greg	1.1	case 't': /* trace */
227	greg	2.42	if (!*vs) break;
228	greg	1.1	*table = NULL;
229			table = every_out;
230			trace = ourtrace;
231	greg	1.11	castonly = 0;
232	greg	1.1	break;
233			case 'o': /* origin */
234			*table++ = oputo;
235			break;
236			case 'd': /* direction */
237			*table++ = oputd;
238			break;
239			case 'v': /* value */
240			*table++ = oputv;
241	greg	1.11	castonly = 0;
242	greg	1.1	break;
243	greg	2.51	case 'V': /* contribution */
244			*table++ = oputV;
245			if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
246			error(WARNING,
247			"-otV accuracy depends on -aa 0 -as 0");
248			break;
249	greg	2.5	case 'l': /* effective distance */
250	greg	1.1	*table++ = oputl;
251	greg	1.11	castonly = 0;
252	greg	1.1	break;
253	greg	2.29	case 'c': /* local coordinates */
254			*table++ = oputc;
255			break;
256	greg	2.5	case 'L': /* single ray length */
257			*table++ = oputL;
258			break;
259	greg	1.1	case 'p': /* point */
260			*table++ = oputp;
261			break;
262	greg	2.9	case 'n': /* perturbed normal */
263	greg	1.1	*table++ = oputn;
264	greg	2.9	castonly = 0;
265	greg	1.1	break;
266	greg	2.9	case 'N': /* unperturbed normal */
267			*table++ = oputN;
268			break;
269	greg	1.1	case 's': /* surface */
270			*table++ = oputs;
271			break;
272			case 'w': /* weight */
273			*table++ = oputw;
274			break;
275	greg	2.40	case 'W': /* coefficient */
276			*table++ = oputW;
277			if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
278			error(WARNING,
279	greg	2.41	"-otW accuracy depends on -aa 0 -as 0");
280	greg	2.40	break;
281	greg	1.1	case 'm': /* modifier */
282			*table++ = oputm;
283			break;
284	greg	2.39	case 'M': /* material */
285			*table++ = oputM;
286			break;
287	greg	2.42	case '~': /* tilde */
288			*table++ = oputtilde;
289	greg	2.41	break;
290	greg	1.1	}
291			*table = NULL;
292	gregl	2.24	}
293
294
295	schorsch	2.37	static void
296			bogusray(void) /* print out empty record */
297	gregl	2.24	{
298			thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
299			thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
300	greg	2.40	thisray.rmax = 0.0;
301			rayorigin(&thisray, PRIMARY, NULL, NULL);
302	gregl	2.24	printvals(&thisray);
303	greg	1.1	}
304
305
306	schorsch	2.37	static void
307	greg	2.59	raycast( /* compute first ray intersection only */
308			RAY *r
309	schorsch	2.37	)
310	greg	1.1	{
311	greg	2.59	if (!localhit(r, &thescene)) {
312			if (r->ro == &Aftplane) { /* clipped */
313			r->ro = NULL;
314			r->rot = FHUGE;
315			} else
316			sourcehit(r);
317	greg	2.57	}
318	greg	1.1	}
319
320
321	schorsch	2.37	static void
322	greg	2.59	rayirrad( /* compute irradiance rather than radiance */
323			RAY *r
324			)
325			{
326	greg	2.62	void (old_revf)(RAY ) = r->revf;
327
328	greg	2.59	r->rot = 1e-5; /* pretend we hit surface */
329			VSUM(r->rop, r->rorg, r->rdir, r->rot);
330			r->ron[0] = -r->rdir[0];
331			r->ron[1] = -r->rdir[1];
332			r->ron[2] = -r->rdir[2];
333			r->rod = 1.0;
334	greg	2.62	/* compute result */
335	greg	2.61	r->revf = raytrace;
336	greg	2.59	(*ofun[Lamb.otype].funp)(&Lamb, r);
337	greg	2.62	r->revf = old_revf;
338	greg	2.59	}
339
340
341			static void
342			rtcompute( /* compute and print ray value(s) */
343	schorsch	2.37	FVECT org,
344	greg	2.59	FVECT dir,
345			double dmax
346	schorsch	2.37	)
347	greg	1.1	{
348	greg	2.60	/* set up ray */
349			rayorigin(&thisray, PRIMARY, NULL, NULL);
350			if (imm_irrad) {
351	greg	2.59	VSUM(thisray.rorg, org, dir, 1.1e-4);
352			thisray.rdir[0] = -dir[0];
353			thisray.rdir[1] = -dir[1];
354			thisray.rdir[2] = -dir[2];
355			thisray.rmax = 0.0;
356	greg	2.60	thisray.revf = rayirrad;
357	greg	2.59	} else {
358			VCOPY(thisray.rorg, org);
359			VCOPY(thisray.rdir, dir);
360			thisray.rmax = dmax;
361	greg	2.60	if (castonly)
362			thisray.revf = raycast;
363	greg	2.59	}
364			if (ray_pnprocs > 1) { /* multiprocessing FIFO? */
365			if (ray_fifo_in(&thisray) < 0)
366			error(USER, "lost children");
367			return;
368			}
369			samplendx++; /* else do it ourselves */
370			rayvalue(&thisray);
371	greg	2.16	printvals(&thisray);
372			}
373
374
375	greg	2.57	static int
376	schorsch	2.37	printvals( /* print requested ray values */
377			RAY *r
378			)
379	greg	2.16	{
380	greg	2.56	oputf_t **tp;
381	greg	2.16
382			if (ray_out[0] == NULL)
383	greg	2.57	return(0);
384	greg	2.16	for (tp = ray_out; *tp != NULL; tp++)
385			(**tp)(r);
386	greg	1.1	if (outform == 'a')
387			putchar('\n');
388	greg	2.57	return(1);
389	greg	1.1	}
390
391
392	schorsch	2.37	static int
393			getvec( /* get a vector from fp */
394	greg	2.56	FVECT vec,
395	schorsch	2.37	int fmt,
396			FILE *fp
397			)
398	greg	1.1	{
399			static float vf[3];
400	greg	2.5	static double vd[3];
401	greg	1.19	char buf[32];
402	greg	2.56	int i;
403	greg	1.1
404			switch (fmt) {
405			case 'a': /* ascii */
406	greg	1.19	for (i = 0; i < 3; i++) {
407			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
408			!isflt(buf))
409			return(-1);
410			vec[i] = atof(buf);
411			}
412	greg	1.1	break;
413			case 'f': /* binary float */
414	greg	2.70	if (getbinary(vf, sizeof(float), 3, fp) != 3)
415	greg	1.1	return(-1);
416	greg	2.58	VCOPY(vec, vf);
417	greg	1.1	break;
418			case 'd': /* binary double */
419	greg	2.70	if (getbinary(vd, sizeof(double), 3, fp) != 3)
420	greg	1.1	return(-1);
421	greg	2.58	VCOPY(vec, vd);
422	greg	1.1	break;
423	greg	2.6	default:
424			error(CONSISTENCY, "botched input format");
425	greg	1.1	}
426			return(0);
427			}
428
429
430	greg	2.57	void
431	schorsch	2.37	tranotify( /* record new modifier */
432			OBJECT obj
433			)
434	greg	2.15	{
435			static int hitlimit = 0;
436	greg	2.56	OBJREC *o = objptr(obj);
437			char **tralp;
438	greg	2.15
439	greg	2.27	if (obj == OVOID) { /* starting over */
440			traset[0] = 0;
441			hitlimit = 0;
442			return;
443			}
444	greg	2.15	if (hitlimit \|\| !ismodifier(o->otype))
445			return;
446			for (tralp = tralist; *tralp != NULL; tralp++)
447			if (!strcmp(o->oname, *tralp)) {
448			if (traset[0] >= MAXTSET) {
449			error(WARNING, "too many modifiers in trace list");
450			hitlimit++;
451			return; /* should this be fatal? */
452			}
453			insertelem(traset, obj);
454			return;
455			}
456			}
457
458
459	greg	2.27	static void
460	schorsch	2.37	ourtrace( /* print ray values */
461			RAY *r
462			)
463	greg	1.1	{
464	greg	2.56	oputf_t **tp;
465	greg	1.1
466			if (every_out[0] == NULL)
467	greg	2.15	return;
468	greg	2.16	if (r->ro == NULL) {
469			if (traincl == 1)
470			return;
471			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
472	greg	1.1	return;
473			tabin(r);
474			for (tp = every_out; *tp != NULL; tp++)
475			(**tp)(r);
476	greg	2.41	if (outform == 'a')
477			putchar('\n');
478	greg	1.1	}
479
480
481	greg	2.27	static void
482	schorsch	2.37	tabin( /* tab in appropriate amount */
483			RAY *r
484			)
485	greg	1.1	{
486	greg	2.40	const RAY *rp;
487	greg	1.1
488			for (rp = r->parent; rp != NULL; rp = rp->parent)
489			putchar('\t');
490			}
491
492
493	greg	2.27	static void
494	schorsch	2.37	oputo( /* print origin */
495			RAY *r
496			)
497	greg	1.1	{
498	greg	2.65	(*putreal)(r->rorg, 3);
499	greg	1.1	}
500
501
502	greg	2.27	static void
503	schorsch	2.37	oputd( /* print direction */
504			RAY *r
505			)
506	greg	1.1	{
507	greg	2.65	(*putreal)(r->rdir, 3);
508	greg	1.1	}
509
510
511	greg	2.27	static void
512	schorsch	2.37	oputv( /* print value */
513			RAY *r
514			)
515	greg	1.1	{
516	greg	2.65	RREAL cval[3];
517
518	greg	2.6	if (outform == 'c') {
519	greg	2.41	COLR cout;
520	greg	2.6	setcolr(cout, colval(r->rcol,RED),
521			colval(r->rcol,GRN),
522			colval(r->rcol,BLU));
523	greg	2.69	putbinary(cout, sizeof(cout), 1, stdout);
524	greg	2.6	return;
525			}
526	greg	2.65	cval[0] = colval(r->rcol,RED);
527			cval[1] = colval(r->rcol,GRN);
528			cval[2] = colval(r->rcol,BLU);
529			(*putreal)(cval, 3);
530	greg	1.1	}
531
532
533	greg	2.27	static void
534	greg	2.51	oputV( /* print value contribution */
535			RAY *r
536			)
537			{
538	greg	2.65	RREAL contr[3];
539	greg	2.51
540			raycontrib(contr, r, PRIMARY);
541			multcolor(contr, r->rcol);
542	greg	2.65	(*putreal)(contr, 3);
543	greg	2.51	}
544
545
546			static void
547	schorsch	2.37	oputl( /* print effective distance */
548			RAY *r
549			)
550	greg	1.1	{
551	greg	2.65	(*putreal)(&r->rt, 1);
552	greg	2.5	}
553
554
555	greg	2.27	static void
556	schorsch	2.37	oputL( /* print single ray length */
557			RAY *r
558			)
559	greg	2.5	{
560	greg	2.65	(*putreal)(&r->rot, 1);
561	greg	1.1	}
562
563
564	greg	2.27	static void
565	schorsch	2.37	oputc( /* print local coordinates */
566			RAY *r
567			)
568	greg	2.29	{
569	greg	2.65	(*putreal)(r->uv, 2);
570	greg	2.29	}
571
572
573	greg	2.65	static RREAL vdummy[3] = {0.0, 0.0, 0.0};
574
575
576	greg	2.29	static void
577	schorsch	2.37	oputp( /* print point */
578			RAY *r
579			)
580	greg	1.1	{
581	greg	2.65	if (r->rot < FHUGE)
582			(*putreal)(r->rop, 3);
583			else
584			(*putreal)(vdummy, 3);
585	greg	1.1	}
586
587
588	greg	2.27	static void
589	schorsch	2.37	oputN( /* print unperturbed normal */
590			RAY *r
591			)
592	greg	1.1	{
593	greg	2.65	if (r->rot < FHUGE)
594			(*putreal)(r->ron, 3);
595			else
596			(*putreal)(vdummy, 3);
597	greg	2.9	}
598
599
600	greg	2.27	static void
601	schorsch	2.37	oputn( /* print perturbed normal */
602			RAY *r
603			)
604	greg	2.9	{
605			FVECT pnorm;
606
607			if (r->rot >= FHUGE) {
608	greg	2.65	(*putreal)(vdummy, 3);
609	greg	2.9	return;
610			}
611			raynormal(pnorm, r);
612	greg	2.65	(*putreal)(pnorm, 3);
613	greg	1.1	}
614
615
616	greg	2.27	static void
617	schorsch	2.37	oputs( /* print name */
618			RAY *r
619			)
620	greg	1.1	{
621			if (r->ro != NULL)
622			fputs(r->ro->oname, stdout);
623			else
624			putchar('*');
625			putchar('\t');
626			}
627
628
629	greg	2.27	static void
630	schorsch	2.37	oputw( /* print weight */
631			RAY *r
632			)
633	greg	1.1	{
634	greg	2.65	RREAL rwt = r->rweight;
635
636			(*putreal)(&rwt, 1);
637	greg	1.1	}
638
639
640	greg	2.27	static void
641	greg	2.51	oputW( /* print coefficient */
642	greg	2.40	RAY *r
643			)
644			{
645	greg	2.65	RREAL contr[3];
646	greg	2.67	/* shadow ray not on source? */
647			if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
648			setcolor(contr, 0.0, 0.0, 0.0);
649			else
650			raycontrib(contr, r, PRIMARY);
651	greg	2.40
652	greg	2.65	(*putreal)(contr, 3);
653	greg	2.40	}
654
655
656			static void
657	schorsch	2.37	oputm( /* print modifier */
658			RAY *r
659			)
660	greg	1.1	{
661			if (r->ro != NULL)
662	greg	2.23	if (r->ro->omod != OVOID)
663			fputs(objptr(r->ro->omod)->oname, stdout);
664			else
665			fputs(VOIDID, stdout);
666	greg	1.1	else
667			putchar('*');
668			putchar('\t');
669			}
670
671
672	greg	2.27	static void
673	greg	2.39	oputM( /* print material */
674			RAY *r
675			)
676			{
677			OBJREC *mat;
678
679			if (r->ro != NULL) {
680			if ((mat = findmaterial(r->ro)) != NULL)
681			fputs(mat->oname, stdout);
682			else
683			fputs(VOIDID, stdout);
684			} else
685			putchar('*');
686			putchar('\t');
687			}
688
689
690			static void
691	greg	2.42	oputtilde( /* output tilde (spacer) */
692	greg	2.41	RAY *r
693			)
694			{
695	greg	2.42	fputs("~\t", stdout);
696	greg	2.41	}
697
698
699			static void
700	greg	2.65	puta( /* print ascii value(s) */
701			RREAL *v, int n
702	schorsch	2.37	)
703	greg	1.1	{
704	greg	2.65	if (n == 3) {
705			printf("%e\t%e\t%e\t", v[0], v[1], v[2]);
706			return;
707			}
708			while (n--)
709			printf("%e\t", *v++);
710	greg	1.1	}
711
712
713	greg	2.27	static void
714	greg	2.65	putd(RREAL v, int n) / print binary double(s) */
715	greg	1.1	{
716	greg	2.68	#ifdef SMLFLT
717			double da[3];
718			int i;
719
720			if (n > 3)
721	greg	2.65	error(INTERNAL, "code error in putd()");
722	greg	2.68	for (i = n; i--; )
723			da[i] = v[i];
724	greg	2.69	putbinary(da, sizeof(double), n, stdout);
725	greg	2.68	#else
726	greg	2.69	putbinary(v, sizeof(RREAL), n, stdout);
727	greg	2.68	#endif
728	greg	1.1	}
729
730
731	greg	2.27	static void
732	greg	2.65	putf(RREAL v, int n) / print binary float(s) */
733	greg	1.1	{
734	greg	2.68	#ifndef SMLFLT
735	greg	2.65	float fa[3];
736			int i;
737	greg	1.1
738	greg	2.65	if (n > 3)
739			error(INTERNAL, "code error in putf()");
740			for (i = n; i--; )
741			fa[i] = v[i];
742	greg	2.69	putbinary(fa, sizeof(float), n, stdout);
743	greg	2.68	#else
744	greg	2.69	putbinary(v, sizeof(RREAL), n, stdout);
745	greg	2.68	#endif
746	greg	1.1	}