src/rt/rtrace.c

#ifndef lint
static const char       RCSid[] = "$Id: rtrace.c,v 2.77 2019/05/04 13:48:06 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,
                oputr, oputR, oputx, oputX, 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[32], *every_out[32];
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;
        int  bogusflushed = 0;
        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);
                else
                        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 && !bogusflushed) {
                                if (ray_pnprocs > 1 && ray_fifo_flush() < 0)
                                        error(USER, "child(ren) died");
                                bogusray();
                                fflush(stdout);
                                bogusflushed = 1;
                                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 (ray_pnprocs > 1 && ray_fifo_flush() < 0)
                                        error(USER, "child(ren) died");
                                fflush(stdout);
                                nextflush = hresolu;
                        } else
                                bogusflushed = 0;
                }
                if (ferror(stdout))
                        error(SYSTEM, "write error");
                if (vcount && !--vcount)                /* check for end */
                        break;
        }
        if (ray_pnprocs > 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 'r':                               /* reflected contrib. */
                        *table++ = oputr;
                        castonly = 0;
                        break;
                case 'R':                               /* reflected distance */
                        *table++ = oputR;
                        castonly = 0;
                        break;
                case 'x':                               /* xmit contrib. */
                        *table++ = oputx;
                        castonly = 0;
                        break;
                case 'X':                               /* xmit distance */
                        *table++ = oputX;
                        castonly = 0;
                        break;
                case 'v':                               /* value */
                        *table++ = oputv;
                        castonly = 0;
                        break;
                case 'V':                               /* contribution */
                        *table++ = oputV;
                        castonly = 0;
                        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;
                        castonly = 0;
                        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 */
{
        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;
                                        /* pretend we hit surface */
        r->rxt = r->rot = 1e-5;
        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
oputr(                          /* print mirrored contribution */
        RAY  *r
)
{
        RREAL   cval[3];

        cval[0] = colval(r->mcol,RED);
        cval[1] = colval(r->mcol,GRN);
        cval[2] = colval(r->mcol,BLU);
        (*putreal)(cval, 3);
}


static void
oputR(                          /* print mirrored distance */
        RAY  *r
)
{
        (*putreal)(&r->rmt, 1);
}


static void
oputx(                          /* print unmirrored contribution */
        RAY  *r
)
{
        RREAL   cval[3];

        cval[0] = colval(r->rcol,RED) - colval(r->mcol,RED);
        cval[1] = colval(r->rcol,GRN) - colval(r->mcol,GRN);
        cval[2] = colval(r->rcol,BLU) - colval(r->mcol,BLU);
        (*putreal)(cval, 3);
}


static void
oputX(                          /* print unmirrored distance */
        RAY  *r
)
{
        (*putreal)(&r->rxt, 1);
}


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
)
{
        RREAL   d = raydistance(r);

        (*putreal)(&d, 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:	2.78
Committed:	Sat May 4 23:10:32 2019 UTC (5 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.77:	+8 -5 lines
Log Message:	Removed unnecessary clear + made multiple zero directions -> single flush
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.78	static const char RCSid[] = "$Id: rtrace.c,v 2.77 2019/05/04 13:48:06 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	2.73	oputr, oputR, oputx, oputX, oputn, oputN, oputs,
63			oputw, oputW, oputm, oputM, oputtilde;
64	schorsch	2.37
65			static void setoutput(char *vs);
66	greg	2.57	extern void tranotify(OBJECT obj);
67	schorsch	2.37	static void bogusray(void);
68	greg	2.59	static void raycast(RAY *r);
69			static void rayirrad(RAY *r);
70			static void rtcompute(FVECT org, FVECT dir, double dmax);
71	greg	2.57	static int printvals(RAY *r);
72			static int getvec(FVECT vec, int fmt, FILE *fp);
73			static void tabin(RAY *r);
74			static void ourtrace(RAY *r);
75	greg	1.1
76	greg	2.73	static oputf_t ray_out[32], every_out[32];
77	schorsch	2.37	static putf_t *putreal;
78	greg	2.27
79	greg	1.1
80	greg	2.27	void
81	schorsch	2.37	quit( /* quit program */
82			int code
83			)
84	greg	1.1	{
85	greg	2.57	if (ray_pnprocs > 0) /* close children if any */
86			ray_pclose(0);
87			#ifndef NON_POSIX
88	greg	2.58	else if (!ray_pnprocs) {
89			headclean(); /* delete header file */
90			pfclean(); /* clean up persist files */
91			}
92	greg	2.11	#endif
93	greg	1.1	exit(code);
94			}
95
96
97	greg	2.57	char *
98	schorsch	2.37	formstr( /* return format identifier */
99			int f
100			)
101	greg	2.6	{
102			switch (f) {
103			case 'a': return("ascii");
104			case 'f': return("float");
105			case 'd': return("double");
106			case 'c': return(COLRFMT);
107			}
108			return("unknown");
109			}
110
111
112	schorsch	2.37	extern void
113			rtrace( /* trace rays from file */
114	greg	2.59	char *fname,
115			int nproc
116	schorsch	2.37	)
117	greg	1.1	{
118	greg	2.45	unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu
119	greg	2.66	: (unsigned long)vresolu;
120	greg	2.64	long nextflush = (vresolu > 0) & (hresolu > 1) ? 0 : hresolu;
121	greg	2.78	int bogusflushed = 0;
122	greg	1.1	FILE *fp;
123	gregl	2.25	double d;
124	greg	1.2	FVECT orig, direc;
125	greg	1.1	/* set up input */
126			if (fname == NULL)
127			fp = stdin;
128			else if ((fp = fopen(fname, "r")) == NULL) {
129			sprintf(errmsg, "cannot open input file \"%s\"", fname);
130			error(SYSTEM, errmsg);
131			}
132	greg	2.8	if (inform != 'a')
133	schorsch	2.30	SET_FILE_BINARY(fp);
134	greg	1.1	/* set up output */
135	greg	2.16	setoutput(outvals);
136	greg	2.59	if (imm_irrad)
137			castonly = 0;
138			else if (castonly)
139			nproc = 1; /* don't bother multiprocessing */
140	greg	1.1	switch (outform) {
141			case 'a': putreal = puta; break;
142			case 'f': putreal = putf; break;
143			case 'd': putreal = putd; break;
144	greg	2.6	case 'c':
145			if (strcmp(outvals, "v"))
146			error(USER, "color format with value output only");
147			break;
148			default:
149			error(CONSISTENCY, "botched output format");
150	greg	1.1	}
151	greg	2.59	if (nproc > 1) { /* start multiprocessing */
152			ray_popen(nproc);
153	greg	2.58	ray_fifo_out = printvals;
154	greg	2.59	}
155	greg	2.12	if (hresolu > 0) {
156			if (vresolu > 0)
157			fprtresolu(hresolu, vresolu, stdout);
158	greg	2.78	else
159			fflush(stdout);
160	greg	2.12	}
161	greg	1.1	/* process file */
162			while (getvec(orig, inform, fp) == 0 &&
163			getvec(direc, inform, fp) == 0) {
164
165	gregl	2.25	d = normalize(direc);
166			if (d == 0.0) { /* zero ==> flush */
167	greg	2.78	if ((--nextflush <= 0) \| !vcount && !bogusflushed) {
168	greg	2.74	if (ray_pnprocs > 1 && ray_fifo_flush() < 0)
169	greg	2.71	error(USER, "child(ren) died");
170	greg	2.63	bogusray();
171	gregl	2.24	fflush(stdout);
172	greg	2.78	bogusflushed = 1;
173	greg	2.64	nextflush = (vresolu > 0) & (hresolu > 1) ? 0 :
174			hresolu;
175	greg	2.63	} else
176			bogusray();
177	greg	2.57	} else { /* compute and print */
178	greg	2.59	rtcompute(orig, direc, lim_dist ? d : 0.0);
179	greg	1.7	/* flush if time */
180	greg	2.45	if (!--nextflush) {
181	greg	2.74	if (ray_pnprocs > 1 && ray_fifo_flush() < 0)
182	greg	2.71	error(USER, "child(ren) died");
183	gregl	2.24	fflush(stdout);
184			nextflush = hresolu;
185	greg	2.78	} else
186			bogusflushed = 0;
187	greg	1.1	}
188			if (ferror(stdout))
189			error(SYSTEM, "write error");
190	greg	2.45	if (vcount && !--vcount) /* check for end */
191	greg	1.1	break;
192			}
193	greg	2.74	if (ray_pnprocs > 1) { /* clean up children */
194	greg	2.59	if (ray_fifo_flush() < 0)
195			error(USER, "unable to complete processing");
196			ray_pclose(0);
197			}
198	greg	2.50	if (fflush(stdout) < 0)
199			error(SYSTEM, "write error");
200	greg	2.45	if (vcount)
201	greg	2.42	error(USER, "unexpected EOF on input");
202	greg	2.12	if (fname != NULL)
203			fclose(fp);
204	greg	1.1	}
205
206
207	schorsch	2.37	static void
208	greg	2.40	trace_sources(void) /* trace rays to light sources, also */
209			{
210			int sn;
211
212			for (sn = 0; sn < nsources; sn++)
213			source[sn].sflags \|= SFOLLOW;
214			}
215
216
217			static void
218	schorsch	2.37	setoutput( /* set up output tables */
219	greg	2.56	char *vs
220	schorsch	2.37	)
221	greg	1.1	{
222	greg	2.56	oputf_t **table = ray_out;
223	greg	1.1
224	greg	1.11	castonly = 1;
225	greg	1.1	while (*vs)
226			switch (*vs++) {
227	greg	2.40	case 'T': /* trace sources */
228	greg	2.42	if (!*vs) break;
229	greg	2.40	trace_sources();
230			/* fall through */
231	greg	1.1	case 't': /* trace */
232	greg	2.42	if (!*vs) break;
233	greg	1.1	*table = NULL;
234			table = every_out;
235			trace = ourtrace;
236	greg	1.11	castonly = 0;
237	greg	1.1	break;
238			case 'o': /* origin */
239			*table++ = oputo;
240			break;
241			case 'd': /* direction */
242			*table++ = oputd;
243			break;
244	greg	2.73	case 'r': /* reflected contrib. */
245			*table++ = oputr;
246			castonly = 0;
247			break;
248			case 'R': /* reflected distance */
249			*table++ = oputR;
250			castonly = 0;
251			break;
252			case 'x': /* xmit contrib. */
253			*table++ = oputx;
254			castonly = 0;
255			break;
256			case 'X': /* xmit distance */
257			*table++ = oputX;
258			castonly = 0;
259			break;
260	greg	1.1	case 'v': /* value */
261			*table++ = oputv;
262	greg	1.11	castonly = 0;
263	greg	1.1	break;
264	greg	2.51	case 'V': /* contribution */
265			*table++ = oputV;
266	greg	2.73	castonly = 0;
267	greg	2.51	if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
268			error(WARNING,
269			"-otV accuracy depends on -aa 0 -as 0");
270			break;
271	greg	2.5	case 'l': /* effective distance */
272	greg	1.1	*table++ = oputl;
273	greg	1.11	castonly = 0;
274	greg	1.1	break;
275	greg	2.29	case 'c': /* local coordinates */
276			*table++ = oputc;
277			break;
278	greg	2.5	case 'L': /* single ray length */
279			*table++ = oputL;
280			break;
281	greg	1.1	case 'p': /* point */
282			*table++ = oputp;
283			break;
284	greg	2.9	case 'n': /* perturbed normal */
285	greg	1.1	*table++ = oputn;
286	greg	2.9	castonly = 0;
287	greg	1.1	break;
288	greg	2.9	case 'N': /* unperturbed normal */
289			*table++ = oputN;
290			break;
291	greg	1.1	case 's': /* surface */
292			*table++ = oputs;
293			break;
294			case 'w': /* weight */
295			*table++ = oputw;
296			break;
297	greg	2.40	case 'W': /* coefficient */
298			*table++ = oputW;
299	greg	2.73	castonly = 0;
300	greg	2.40	if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
301			error(WARNING,
302	greg	2.41	"-otW accuracy depends on -aa 0 -as 0");
303	greg	2.40	break;
304	greg	1.1	case 'm': /* modifier */
305			*table++ = oputm;
306			break;
307	greg	2.39	case 'M': /* material */
308			*table++ = oputM;
309			break;
310	greg	2.42	case '~': /* tilde */
311			*table++ = oputtilde;
312	greg	2.41	break;
313	greg	1.1	}
314			*table = NULL;
315	gregl	2.24	}
316
317
318	schorsch	2.37	static void
319			bogusray(void) /* print out empty record */
320	gregl	2.24	{
321	greg	2.40	rayorigin(&thisray, PRIMARY, NULL, NULL);
322	gregl	2.24	printvals(&thisray);
323	greg	1.1	}
324
325
326	schorsch	2.37	static void
327	greg	2.59	raycast( /* compute first ray intersection only */
328			RAY *r
329	schorsch	2.37	)
330	greg	1.1	{
331	greg	2.59	if (!localhit(r, &thescene)) {
332			if (r->ro == &Aftplane) { /* clipped */
333			r->ro = NULL;
334			r->rot = FHUGE;
335			} else
336			sourcehit(r);
337	greg	2.57	}
338	greg	1.1	}
339
340
341	schorsch	2.37	static void
342	greg	2.59	rayirrad( /* compute irradiance rather than radiance */
343			RAY *r
344			)
345			{
346	greg	2.62	void (old_revf)(RAY ) = r->revf;
347	greg	2.75	/* pretend we hit surface */
348	greg	2.76	r->rxt = r->rot = 1e-5;
349	greg	2.59	VSUM(r->rop, r->rorg, r->rdir, r->rot);
350			r->ron[0] = -r->rdir[0];
351			r->ron[1] = -r->rdir[1];
352			r->ron[2] = -r->rdir[2];
353			r->rod = 1.0;
354	greg	2.62	/* compute result */
355	greg	2.61	r->revf = raytrace;
356	greg	2.59	(*ofun[Lamb.otype].funp)(&Lamb, r);
357	greg	2.62	r->revf = old_revf;
358	greg	2.59	}
359
360
361			static void
362			rtcompute( /* compute and print ray value(s) */
363	schorsch	2.37	FVECT org,
364	greg	2.59	FVECT dir,
365			double dmax
366	schorsch	2.37	)
367	greg	1.1	{
368	greg	2.60	/* set up ray */
369			rayorigin(&thisray, PRIMARY, NULL, NULL);
370			if (imm_irrad) {
371	greg	2.59	VSUM(thisray.rorg, org, dir, 1.1e-4);
372			thisray.rdir[0] = -dir[0];
373			thisray.rdir[1] = -dir[1];
374			thisray.rdir[2] = -dir[2];
375			thisray.rmax = 0.0;
376	greg	2.60	thisray.revf = rayirrad;
377	greg	2.59	} else {
378			VCOPY(thisray.rorg, org);
379			VCOPY(thisray.rdir, dir);
380			thisray.rmax = dmax;
381	greg	2.60	if (castonly)
382			thisray.revf = raycast;
383	greg	2.59	}
384			if (ray_pnprocs > 1) { /* multiprocessing FIFO? */
385			if (ray_fifo_in(&thisray) < 0)
386			error(USER, "lost children");
387			return;
388			}
389			samplendx++; /* else do it ourselves */
390			rayvalue(&thisray);
391	greg	2.16	printvals(&thisray);
392			}
393
394
395	greg	2.57	static int
396	schorsch	2.37	printvals( /* print requested ray values */
397			RAY *r
398			)
399	greg	2.16	{
400	greg	2.56	oputf_t **tp;
401	greg	2.16
402			if (ray_out[0] == NULL)
403	greg	2.57	return(0);
404	greg	2.16	for (tp = ray_out; *tp != NULL; tp++)
405			(**tp)(r);
406	greg	1.1	if (outform == 'a')
407			putchar('\n');
408	greg	2.57	return(1);
409	greg	1.1	}
410
411
412	schorsch	2.37	static int
413			getvec( /* get a vector from fp */
414	greg	2.56	FVECT vec,
415	schorsch	2.37	int fmt,
416			FILE *fp
417			)
418	greg	1.1	{
419			static float vf[3];
420	greg	2.5	static double vd[3];
421	greg	1.19	char buf[32];
422	greg	2.56	int i;
423	greg	1.1
424			switch (fmt) {
425			case 'a': /* ascii */
426	greg	1.19	for (i = 0; i < 3; i++) {
427			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
428			!isflt(buf))
429			return(-1);
430			vec[i] = atof(buf);
431			}
432	greg	1.1	break;
433			case 'f': /* binary float */
434	greg	2.70	if (getbinary(vf, sizeof(float), 3, fp) != 3)
435	greg	1.1	return(-1);
436	greg	2.58	VCOPY(vec, vf);
437	greg	1.1	break;
438			case 'd': /* binary double */
439	greg	2.70	if (getbinary(vd, sizeof(double), 3, fp) != 3)
440	greg	1.1	return(-1);
441	greg	2.58	VCOPY(vec, vd);
442	greg	1.1	break;
443	greg	2.6	default:
444			error(CONSISTENCY, "botched input format");
445	greg	1.1	}
446			return(0);
447			}
448
449
450	greg	2.57	void
451	schorsch	2.37	tranotify( /* record new modifier */
452			OBJECT obj
453			)
454	greg	2.15	{
455			static int hitlimit = 0;
456	greg	2.56	OBJREC *o = objptr(obj);
457			char **tralp;
458	greg	2.15
459	greg	2.27	if (obj == OVOID) { /* starting over */
460			traset[0] = 0;
461			hitlimit = 0;
462			return;
463			}
464	greg	2.15	if (hitlimit \|\| !ismodifier(o->otype))
465			return;
466			for (tralp = tralist; *tralp != NULL; tralp++)
467			if (!strcmp(o->oname, *tralp)) {
468			if (traset[0] >= MAXTSET) {
469			error(WARNING, "too many modifiers in trace list");
470			hitlimit++;
471			return; /* should this be fatal? */
472			}
473			insertelem(traset, obj);
474			return;
475			}
476			}
477
478
479	greg	2.27	static void
480	schorsch	2.37	ourtrace( /* print ray values */
481			RAY *r
482			)
483	greg	1.1	{
484	greg	2.56	oputf_t **tp;
485	greg	1.1
486			if (every_out[0] == NULL)
487	greg	2.15	return;
488	greg	2.16	if (r->ro == NULL) {
489			if (traincl == 1)
490			return;
491			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
492	greg	1.1	return;
493			tabin(r);
494			for (tp = every_out; *tp != NULL; tp++)
495			(**tp)(r);
496	greg	2.41	if (outform == 'a')
497			putchar('\n');
498	greg	1.1	}
499
500
501	greg	2.27	static void
502	schorsch	2.37	tabin( /* tab in appropriate amount */
503			RAY *r
504			)
505	greg	1.1	{
506	greg	2.40	const RAY *rp;
507	greg	1.1
508			for (rp = r->parent; rp != NULL; rp = rp->parent)
509			putchar('\t');
510			}
511
512
513	greg	2.27	static void
514	schorsch	2.37	oputo( /* print origin */
515			RAY *r
516			)
517	greg	1.1	{
518	greg	2.65	(*putreal)(r->rorg, 3);
519	greg	1.1	}
520
521
522	greg	2.27	static void
523	schorsch	2.37	oputd( /* print direction */
524			RAY *r
525			)
526	greg	1.1	{
527	greg	2.65	(*putreal)(r->rdir, 3);
528	greg	1.1	}
529
530
531	greg	2.27	static void
532	greg	2.73	oputr( /* print mirrored contribution */
533			RAY *r
534			)
535			{
536			RREAL cval[3];
537
538			cval[0] = colval(r->mcol,RED);
539			cval[1] = colval(r->mcol,GRN);
540			cval[2] = colval(r->mcol,BLU);
541			(*putreal)(cval, 3);
542			}
543
544
545
546			static void
547			oputR( /* print mirrored distance */
548			RAY *r
549			)
550			{
551			(*putreal)(&r->rmt, 1);
552			}
553
554
555			static void
556			oputx( /* print unmirrored contribution */
557			RAY *r
558			)
559			{
560			RREAL cval[3];
561
562			cval[0] = colval(r->rcol,RED) - colval(r->mcol,RED);
563			cval[1] = colval(r->rcol,GRN) - colval(r->mcol,GRN);
564			cval[2] = colval(r->rcol,BLU) - colval(r->mcol,BLU);
565			(*putreal)(cval, 3);
566			}
567
568
569			static void
570			oputX( /* print unmirrored distance */
571			RAY *r
572			)
573			{
574			(*putreal)(&r->rxt, 1);
575			}
576
577
578			static void
579	schorsch	2.37	oputv( /* print value */
580			RAY *r
581			)
582	greg	1.1	{
583	greg	2.65	RREAL cval[3];
584
585	greg	2.6	if (outform == 'c') {
586	greg	2.41	COLR cout;
587	greg	2.6	setcolr(cout, colval(r->rcol,RED),
588			colval(r->rcol,GRN),
589			colval(r->rcol,BLU));
590	greg	2.69	putbinary(cout, sizeof(cout), 1, stdout);
591	greg	2.6	return;
592			}
593	greg	2.65	cval[0] = colval(r->rcol,RED);
594			cval[1] = colval(r->rcol,GRN);
595			cval[2] = colval(r->rcol,BLU);
596			(*putreal)(cval, 3);
597	greg	1.1	}
598
599
600	greg	2.27	static void
601	greg	2.51	oputV( /* print value contribution */
602			RAY *r
603			)
604			{
605	greg	2.65	RREAL contr[3];
606	greg	2.51
607			raycontrib(contr, r, PRIMARY);
608			multcolor(contr, r->rcol);
609	greg	2.65	(*putreal)(contr, 3);
610	greg	2.51	}
611
612
613			static void
614	schorsch	2.37	oputl( /* print effective distance */
615			RAY *r
616			)
617	greg	1.1	{
618	greg	2.73	RREAL d = raydistance(r);
619
620			(*putreal)(&d, 1);
621	greg	2.5	}
622
623
624	greg	2.27	static void
625	schorsch	2.37	oputL( /* print single ray length */
626			RAY *r
627			)
628	greg	2.5	{
629	greg	2.65	(*putreal)(&r->rot, 1);
630	greg	1.1	}
631
632
633	greg	2.27	static void
634	schorsch	2.37	oputc( /* print local coordinates */
635			RAY *r
636			)
637	greg	2.29	{
638	greg	2.65	(*putreal)(r->uv, 2);
639	greg	2.29	}
640
641
642	greg	2.65	static RREAL vdummy[3] = {0.0, 0.0, 0.0};
643
644
645	greg	2.29	static void
646	schorsch	2.37	oputp( /* print point */
647			RAY *r
648			)
649	greg	1.1	{
650	greg	2.65	if (r->rot < FHUGE)
651			(*putreal)(r->rop, 3);
652			else
653			(*putreal)(vdummy, 3);
654	greg	1.1	}
655
656
657	greg	2.27	static void
658	schorsch	2.37	oputN( /* print unperturbed normal */
659			RAY *r
660			)
661	greg	1.1	{
662	greg	2.65	if (r->rot < FHUGE)
663			(*putreal)(r->ron, 3);
664			else
665			(*putreal)(vdummy, 3);
666	greg	2.9	}
667
668
669	greg	2.27	static void
670	schorsch	2.37	oputn( /* print perturbed normal */
671			RAY *r
672			)
673	greg	2.9	{
674			FVECT pnorm;
675
676			if (r->rot >= FHUGE) {
677	greg	2.65	(*putreal)(vdummy, 3);
678	greg	2.9	return;
679			}
680			raynormal(pnorm, r);
681	greg	2.65	(*putreal)(pnorm, 3);
682	greg	1.1	}
683
684
685	greg	2.27	static void
686	schorsch	2.37	oputs( /* print name */
687			RAY *r
688			)
689	greg	1.1	{
690			if (r->ro != NULL)
691			fputs(r->ro->oname, stdout);
692			else
693			putchar('*');
694			putchar('\t');
695			}
696
697
698	greg	2.27	static void
699	schorsch	2.37	oputw( /* print weight */
700			RAY *r
701			)
702	greg	1.1	{
703	greg	2.65	RREAL rwt = r->rweight;
704
705			(*putreal)(&rwt, 1);
706	greg	1.1	}
707
708
709	greg	2.27	static void
710	greg	2.51	oputW( /* print coefficient */
711	greg	2.40	RAY *r
712			)
713			{
714	greg	2.65	RREAL contr[3];
715	greg	2.67	/* shadow ray not on source? */
716			if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
717			setcolor(contr, 0.0, 0.0, 0.0);
718			else
719			raycontrib(contr, r, PRIMARY);
720	greg	2.40
721	greg	2.65	(*putreal)(contr, 3);
722	greg	2.40	}
723
724
725			static void
726	schorsch	2.37	oputm( /* print modifier */
727			RAY *r
728			)
729	greg	1.1	{
730			if (r->ro != NULL)
731	greg	2.23	if (r->ro->omod != OVOID)
732			fputs(objptr(r->ro->omod)->oname, stdout);
733			else
734			fputs(VOIDID, stdout);
735	greg	1.1	else
736			putchar('*');
737			putchar('\t');
738			}
739
740
741	greg	2.27	static void
742	greg	2.39	oputM( /* print material */
743			RAY *r
744			)
745			{
746			OBJREC *mat;
747
748			if (r->ro != NULL) {
749			if ((mat = findmaterial(r->ro)) != NULL)
750			fputs(mat->oname, stdout);
751			else
752			fputs(VOIDID, stdout);
753			} else
754			putchar('*');
755			putchar('\t');
756			}
757
758
759			static void
760	greg	2.42	oputtilde( /* output tilde (spacer) */
761	greg	2.41	RAY *r
762			)
763			{
764	greg	2.42	fputs("~\t", stdout);
765	greg	2.41	}
766
767
768			static void
769	greg	2.65	puta( /* print ascii value(s) */
770			RREAL *v, int n
771	schorsch	2.37	)
772	greg	1.1	{
773	greg	2.65	if (n == 3) {
774			printf("%e\t%e\t%e\t", v[0], v[1], v[2]);
775			return;
776			}
777			while (n--)
778			printf("%e\t", *v++);
779	greg	1.1	}
780
781
782	greg	2.27	static void
783	greg	2.65	putd(RREAL v, int n) / print binary double(s) */
784	greg	1.1	{
785	greg	2.68	#ifdef SMLFLT
786			double da[3];
787			int i;
788
789			if (n > 3)
790	greg	2.65	error(INTERNAL, "code error in putd()");
791	greg	2.68	for (i = n; i--; )
792			da[i] = v[i];
793	greg	2.69	putbinary(da, sizeof(double), n, stdout);
794	greg	2.68	#else
795	greg	2.69	putbinary(v, sizeof(RREAL), n, stdout);
796	greg	2.68	#endif
797	greg	1.1	}
798
799
800	greg	2.27	static void
801	greg	2.65	putf(RREAL v, int n) / print binary float(s) */
802	greg	1.1	{
803	greg	2.68	#ifndef SMLFLT
804	greg	2.65	float fa[3];
805			int i;
806	greg	1.1
807	greg	2.65	if (n > 3)
808			error(INTERNAL, "code error in putf()");
809			for (i = n; i--; )
810			fa[i] = v[i];
811	greg	2.69	putbinary(fa, sizeof(float), n, stdout);
812	greg	2.68	#else
813	greg	2.69	putbinary(v, sizeof(RREAL), n, stdout);
814	greg	2.68	#endif
815	greg	1.1	}