src/rt/rtrace.c

#ifndef lint
static const char       RCSid[] = "$Id: rtrace.c,v 2.44 2005/06/05 19:52:01 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  "resolu.h"

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 */

int  imm_irrad = 0;                     /* compute immediate irradiance? */
int  lim_dist = 0;                      /* limit distance? */

int  inform = 'a';                      /* input format */
int  outform = 'a';                     /* output format */
char  *outvals = "v";                   /* output specification */

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

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

char  *tralist[128];                    /* list of modifers to trace (or no) */
int  traincl = -1;                      /* include == 1, exclude == 0 */
#define  MAXTSET        511             /* maximum number in trace set */
OBJECT  traset[MAXTSET+1]={0};          /* trace include/exclude set */

int  hresolu = 0;                       /* horizontal (scan) size */
int  vresolu = 0;                       /* vertical resolution */

double  dstrsrc = 0.0;                  /* square source distribution */
double  shadthresh = .03;               /* shadow threshold */
double  shadcert = .75;                 /* shadow certainty */
int  directrelay = 2;                   /* number of source relays */
int  vspretest = 512;                   /* virtual source pretest density */
int  directvis = 1;                     /* sources visible? */
double  srcsizerat = .2;                /* maximum ratio source size/dist. */

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

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

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

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

char  *ambfile = NULL;                  /* ambient file name */
COLOR  ambval = BLKCOLOR;               /* ambient value */
int  ambvwt = 0;                        /* initial weight for ambient value */
double  ambacc = 0.15;                  /* ambient accuracy */
int  ambres = 256;                      /* ambient resolution */
int  ambdiv = 1024;                     /* ambient divisions */
int  ambssamp = 512;                    /* ambient super-samples */
int  ambounce = 0;                      /* ambient bounces */
char  *amblist[AMBLLEN];                /* ambient include/exclude list */
int  ambincl = -1;                      /* include == 1, exclude == 0 */

static int  castonly = 0;

static RAY  thisray;                    /* for our convenience */

typedef void putf_t(double v);
static putf_t puta, putd, putf;

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

static void setoutput(char *vs);
static void tranotify(OBJECT obj);
static void bogusray(void);
static void rad(FVECT  org, FVECT  dir, double  dmax);
static void irrad(FVECT  org, FVECT  dir);
static void 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  (*addobjnotify[])() = {ambnotify, tranotify, NULL};


void
quit(                   /* quit program */
        int  code
)
{
#ifndef  NON_POSIX /* XXX we don't clean up elsewhere? */
        headclean();            /* delete header file */
        pfclean();              /* clean up persist files */
#endif
        exit(code);
}


extern 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
)
{
        unsigned long  vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu
                                              : vresolu;
        long  nextflush = 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);
        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 (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 */
                        bogusray();
                        if (--nextflush <= 0 || !vcount) {
                                fflush(stdout);
                                nextflush = hresolu;
                        }
                } else {
                        samplendx++;
                                                        /* compute and print */
                        if (imm_irrad)
                                irrad(orig, direc);
                        else
                                rad(orig, direc, lim_dist ? d : 0.0);
                                                        /* flush if time */
                        if (!--nextflush) {
                                fflush(stdout);
                                nextflush = hresolu;
                        }
                }
                if (ferror(stdout))
                        error(SYSTEM, "write error");
                if (vcount && !--vcount)                /* check for end */
                        break;
        }
        fflush(stdout);
        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 */
        register char  *vs
)
{
        register 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 '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
rad(            /* compute and print ray value(s) */
        FVECT  org,
        FVECT  dir,
        double  dmax
)
{
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        thisray.rmax = dmax;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
        if (castonly) {
                if (!localhit(&thisray, &thescene)) {
                        if (thisray.ro == &Aftplane) {  /* clipped */
                                thisray.ro = NULL;
                                thisray.rot = FHUGE;
                        } else
                                sourcehit(&thisray);
                }
        } else
                rayvalue(&thisray);
        printvals(&thisray);
}


static void
irrad(                  /* compute immediate irradiance value */
        FVECT  org,
        FVECT  dir
)
{
        register int  i;

        for (i = 0; i < 3; i++) {
                thisray.rorg[i] = org[i] + dir[i];
                thisray.rdir[i] = -dir[i];
        }
        thisray.rmax = 0.0;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
                                        /* pretend we hit surface */
        thisray.rot = 1.0-1e-4;
        thisray.rod = 1.0;
        VCOPY(thisray.ron, dir);
        for (i = 0; i < 3; i++)         /* fudge factor */
                thisray.rop[i] = org[i] + 1e-4*dir[i];
                                        /* compute and print */
        (*ofun[Lamb.otype].funp)(&Lamb, &thisray);
        printvals(&thisray);
}


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

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


static int
getvec(         /* get a vector from fp */
        register FVECT  vec,
        int  fmt,
        FILE  *fp
)
{
        static float  vf[3];
        static double  vd[3];
        char  buf[32];
        register 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 (fread((char *)vf, sizeof(float), 3, fp) != 3)
                        return(-1);
                vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
                break;
        case 'd':                                       /* binary double */
                if (fread((char *)vd, sizeof(double), 3, fp) != 3)
                        return(-1);
                vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
                break;
        default:
                error(CONSISTENCY, "botched input format");
        }
        return(0);
}


static void
tranotify(                      /* record new modifier */
        OBJECT  obj
)
{
        static int  hitlimit = 0;
        register OBJREC  *o = objptr(obj);
        register 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
)
{
        register 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[0]);
        (*putreal)(r->rorg[1]);
        (*putreal)(r->rorg[2]);
}


static void
oputd(                          /* print direction */
        RAY  *r
)
{
        (*putreal)(r->rdir[0]);
        (*putreal)(r->rdir[1]);
        (*putreal)(r->rdir[2]);
}


static void
oputv(                          /* print value */
        RAY  *r
)
{
        if (outform == 'c') {
                COLR  cout;
                setcolr(cout,   colval(r->rcol,RED),
                                colval(r->rcol,GRN),
                                colval(r->rcol,BLU));
                fwrite((char *)cout, sizeof(cout), 1, stdout);
                return;
        }
        (*putreal)(colval(r->rcol,RED));
        (*putreal)(colval(r->rcol,GRN));
        (*putreal)(colval(r->rcol,BLU));
}


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


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


static void
oputc(                          /* print local coordinates */
        RAY  *r
)
{
        (*putreal)(r->uv[0]);
        (*putreal)(r->uv[1]);
}


static void
oputp(                          /* print point */
        RAY  *r
)
{
        if (r->rot < FHUGE) {
                (*putreal)(r->rop[0]);
                (*putreal)(r->rop[1]);
                (*putreal)(r->rop[2]);
        } else {
                (*putreal)(0.0);
                (*putreal)(0.0);
                (*putreal)(0.0);
        }
}


static void
oputN(                          /* print unperturbed normal */
        RAY  *r
)
{
        if (r->rot < FHUGE) {
                (*putreal)(r->ron[0]);
                (*putreal)(r->ron[1]);
                (*putreal)(r->ron[2]);
        } else {
                (*putreal)(0.0);
                (*putreal)(0.0);
                (*putreal)(0.0);
        }
}


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

        if (r->rot >= FHUGE) {
                (*putreal)(0.0);
                (*putreal)(0.0);
                (*putreal)(0.0);
                return;
        }
        raynormal(pnorm, r);
        (*putreal)(pnorm[0]);
        (*putreal)(pnorm[1]);
        (*putreal)(pnorm[2]);
}


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
)
{
        (*putreal)(r->rweight);
}


static void
oputW(                          /* print contribution */
        RAY  *r
)
{
        COLOR   contr;

        raycontrib(contr, r, PRIMARY);
        (*putreal)(colval(contr,RED));
        (*putreal)(colval(contr,GRN));
        (*putreal)(colval(contr,BLU));
}


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 */
        double  v
)
{
        printf("%e\t", v);
}


static void
putd(v)                         /* print binary double */
double  v;
{
        fwrite((char *)&v, sizeof(v), 1, stdout);
}


static void
putf(v)                         /* print binary float */
double  v;
{
        float f = v;

        fwrite((char *)&f, sizeof(f), 1, stdout);
}
Revision:	2.45
Committed:	Fri Jun 10 16:49:42 2005 UTC (18 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.44:	+7 -6 lines
Log Message:	Fixed bug where rtrace would quit after 2^31 primary rays
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.45	static const char RCSid[] = "$Id: rtrace.c,v 2.44 2005/06/05 19:52:01 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	2.6	#include "resolu.h"
32
33	greg	2.27	CUBE thescene; /* our scene */
34			OBJECT nsceneobjs; /* number of objects in our scene */
35
36	greg	1.14	int dimlist[MAXDIM]; /* sampling dimensions */
37			int ndims = 0; /* number of sampling dimensions */
38			int samplendx = 0; /* index for this sample */
39
40	greg	1.13	int imm_irrad = 0; /* compute immediate irradiance? */
41	gregl	2.25	int lim_dist = 0; /* limit distance? */
42	greg	1.13
43	greg	1.1	int inform = 'a'; /* input format */
44			int outform = 'a'; /* output format */
45			char outvals = "v"; / output specification */
46
47	greg	2.27	int do_irrad = 0; /* compute irradiance? */
48
49			void (trace)() = NULL; / trace call */
50
51	greg	2.15	char tralist[128]; / list of modifers to trace (or no) */
52			int traincl = -1; /* include == 1, exclude == 0 */
53			#define MAXTSET 511 /* maximum number in trace set */
54			OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */
55
56	greg	1.1	int hresolu = 0; /* horizontal (scan) size */
57			int vresolu = 0; /* vertical resolution */
58
59			double dstrsrc = 0.0; /* square source distribution */
60	greg	2.35	double shadthresh = .03; /* shadow threshold */
61			double shadcert = .75; /* shadow certainty */
62	greg	2.19	int directrelay = 2; /* number of source relays */
63	greg	1.17	int vspretest = 512; /* virtual source pretest density */
64	greg	2.10	int directvis = 1; /* sources visible? */
65	greg	2.19	double srcsizerat = .2; /* maximum ratio source size/dist. */
66	greg	2.20
67			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
68	greg	2.22	COLOR salbedo = BLKCOLOR; /* global scattering albedo */
69	greg	2.20	double seccg = 0.; /* global scattering eccentricity */
70			double ssampdist = 0.; /* scatter sampling distance */
71	greg	1.1
72	greg	2.4	double specthresh = .15; /* specular sampling threshold */
73	greg	2.3	double specjitter = 1.; /* specular sampling jitter */
74
75	greg	2.18	int backvis = 1; /* back face visibility */
76
77	greg	2.44	int maxdepth = -10; /* maximum recursion depth */
78	greg	2.34	double minweight = 2e-3; /* minimum ray weight */
79	greg	1.1
80	greg	2.27	char ambfile = NULL; / ambient file name */
81	greg	1.1	COLOR ambval = BLKCOLOR; /* ambient value */
82	greg	2.21	int ambvwt = 0; /* initial weight for ambient value */
83	greg	2.36	double ambacc = 0.15; /* ambient accuracy */
84	greg	2.34	int ambres = 256; /* ambient resolution */
85			int ambdiv = 1024; /* ambient divisions */
86			int ambssamp = 512; /* ambient super-samples */
87	greg	1.1	int ambounce = 0; /* ambient bounces */
88	greg	2.38	char amblist[AMBLLEN]; / ambient include/exclude list */
89	greg	1.1	int ambincl = -1; /* include == 1, exclude == 0 */
90
91	schorsch	2.37	static int castonly = 0;
92	gregl	2.25
93	greg	1.1	static RAY thisray; /* for our convenience */
94
95	schorsch	2.37	typedef void putf_t(double v);
96			static putf_t puta, putd, putf;
97	greg	1.1
98	schorsch	2.37	typedef void oputf_t(RAY *r);
99	greg	2.40	static oputf_t oputo, oputd, oputv, oputl, oputL, oputc, oputp,
100	greg	2.42	oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde;
101	schorsch	2.37
102			static void setoutput(char *vs);
103			static void tranotify(OBJECT obj);
104			static void bogusray(void);
105			static void rad(FVECT org, FVECT dir, double dmax);
106			static void irrad(FVECT org, FVECT dir);
107			static void printvals(RAY *r);
108			static int getvec(FVECT vec, int fmt, FILE *fp);
109			static void tabin(RAY *r);
110			static void ourtrace(RAY *r);
111	greg	1.1
112	schorsch	2.37	static oputf_t ray_out[16], every_out[16];
113			static putf_t *putreal;
114	greg	2.27
115	schorsch	2.37	void (*addobjnotify[])() = {ambnotify, tranotify, NULL};
116	greg	1.1
117
118	greg	2.27	void
119	schorsch	2.37	quit( /* quit program */
120			int code
121			)
122	greg	1.1	{
123	schorsch	2.31	#ifndef NON_POSIX /* XXX we don't clean up elsewhere? */
124	greg	2.11	headclean(); /* delete header file */
125			pfclean(); /* clean up persist files */
126			#endif
127	greg	1.1	exit(code);
128			}
129
130
131	schorsch	2.37	extern char *
132			formstr( /* return format identifier */
133			int f
134			)
135	greg	2.6	{
136			switch (f) {
137			case 'a': return("ascii");
138			case 'f': return("float");
139			case 'd': return("double");
140			case 'c': return(COLRFMT);
141			}
142			return("unknown");
143			}
144
145
146	schorsch	2.37	extern void
147			rtrace( /* trace rays from file */
148			char *fname
149			)
150	greg	1.1	{
151	greg	2.45	unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu
152			: vresolu;
153	greg	1.1	long nextflush = hresolu;
154			FILE *fp;
155	gregl	2.25	double d;
156	greg	1.2	FVECT orig, direc;
157	greg	1.1	/* set up input */
158			if (fname == NULL)
159			fp = stdin;
160			else if ((fp = fopen(fname, "r")) == NULL) {
161			sprintf(errmsg, "cannot open input file \"%s\"", fname);
162			error(SYSTEM, errmsg);
163			}
164	greg	2.8	if (inform != 'a')
165	schorsch	2.30	SET_FILE_BINARY(fp);
166	greg	1.1	/* set up output */
167	greg	2.16	setoutput(outvals);
168	greg	1.1	switch (outform) {
169			case 'a': putreal = puta; break;
170			case 'f': putreal = putf; break;
171			case 'd': putreal = putd; break;
172	greg	2.6	case 'c':
173			if (strcmp(outvals, "v"))
174			error(USER, "color format with value output only");
175			break;
176			default:
177			error(CONSISTENCY, "botched output format");
178	greg	1.1	}
179	greg	2.12	if (hresolu > 0) {
180			if (vresolu > 0)
181			fprtresolu(hresolu, vresolu, stdout);
182			fflush(stdout);
183			}
184	greg	1.1	/* process file */
185			while (getvec(orig, inform, fp) == 0 &&
186			getvec(direc, inform, fp) == 0) {
187
188	gregl	2.25	d = normalize(direc);
189			if (d == 0.0) { /* zero ==> flush */
190	gregl	2.24	bogusray();
191	greg	2.45	if (--nextflush <= 0 \|\| !vcount) {
192	gregl	2.24	fflush(stdout);
193			nextflush = hresolu;
194			}
195			} else {
196			samplendx++;
197	greg	1.1	/* compute and print */
198	gregl	2.24	if (imm_irrad)
199			irrad(orig, direc);
200			else
201	gregl	2.25	rad(orig, direc, lim_dist ? d : 0.0);
202	greg	1.7	/* flush if time */
203	greg	2.45	if (!--nextflush) {
204	gregl	2.24	fflush(stdout);
205			nextflush = hresolu;
206			}
207	greg	1.1	}
208			if (ferror(stdout))
209			error(SYSTEM, "write error");
210	greg	2.45	if (vcount && !--vcount) /* check for end */
211	greg	1.1	break;
212			}
213	greg	2.12	fflush(stdout);
214	greg	2.45	if (vcount)
215	greg	2.42	error(USER, "unexpected EOF on input");
216	greg	2.12	if (fname != NULL)
217			fclose(fp);
218	greg	1.1	}
219
220
221	schorsch	2.37	static void
222	greg	2.40	trace_sources(void) /* trace rays to light sources, also */
223			{
224			int sn;
225
226			for (sn = 0; sn < nsources; sn++)
227			source[sn].sflags \|= SFOLLOW;
228			}
229
230
231			static void
232	schorsch	2.37	setoutput( /* set up output tables */
233			register char *vs
234			)
235	greg	1.1	{
236	schorsch	2.37	register oputf_t **table = ray_out;
237	greg	1.1
238	greg	1.11	castonly = 1;
239	greg	1.1	while (*vs)
240			switch (*vs++) {
241	greg	2.40	case 'T': /* trace sources */
242	greg	2.42	if (!*vs) break;
243	greg	2.40	trace_sources();
244			/* fall through */
245	greg	1.1	case 't': /* trace */
246	greg	2.42	if (!*vs) break;
247	greg	1.1	*table = NULL;
248			table = every_out;
249			trace = ourtrace;
250	greg	1.11	castonly = 0;
251	greg	1.1	break;
252			case 'o': /* origin */
253			*table++ = oputo;
254			break;
255			case 'd': /* direction */
256			*table++ = oputd;
257			break;
258			case 'v': /* value */
259			*table++ = oputv;
260	greg	1.11	castonly = 0;
261	greg	1.1	break;
262	greg	2.5	case 'l': /* effective distance */
263	greg	1.1	*table++ = oputl;
264	greg	1.11	castonly = 0;
265	greg	1.1	break;
266	greg	2.29	case 'c': /* local coordinates */
267			*table++ = oputc;
268			break;
269	greg	2.5	case 'L': /* single ray length */
270			*table++ = oputL;
271			break;
272	greg	1.1	case 'p': /* point */
273			*table++ = oputp;
274			break;
275	greg	2.9	case 'n': /* perturbed normal */
276	greg	1.1	*table++ = oputn;
277	greg	2.9	castonly = 0;
278	greg	1.1	break;
279	greg	2.9	case 'N': /* unperturbed normal */
280			*table++ = oputN;
281			break;
282	greg	1.1	case 's': /* surface */
283			*table++ = oputs;
284			break;
285			case 'w': /* weight */
286			*table++ = oputw;
287			break;
288	greg	2.40	case 'W': /* coefficient */
289			*table++ = oputW;
290			if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
291			error(WARNING,
292	greg	2.41	"-otW accuracy depends on -aa 0 -as 0");
293	greg	2.40	break;
294	greg	1.1	case 'm': /* modifier */
295			*table++ = oputm;
296			break;
297	greg	2.39	case 'M': /* material */
298			*table++ = oputM;
299			break;
300	greg	2.42	case '~': /* tilde */
301			*table++ = oputtilde;
302	greg	2.41	break;
303	greg	1.1	}
304			*table = NULL;
305	gregl	2.24	}
306
307
308	schorsch	2.37	static void
309			bogusray(void) /* print out empty record */
310	gregl	2.24	{
311			thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
312			thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
313	greg	2.40	thisray.rmax = 0.0;
314			rayorigin(&thisray, PRIMARY, NULL, NULL);
315	gregl	2.24	printvals(&thisray);
316	greg	1.1	}
317
318
319	schorsch	2.37	static void
320			rad( /* compute and print ray value(s) */
321			FVECT org,
322			FVECT dir,
323			double dmax
324			)
325	greg	1.1	{
326			VCOPY(thisray.rorg, org);
327			VCOPY(thisray.rdir, dir);
328	gregl	2.25	thisray.rmax = dmax;
329	greg	2.40	rayorigin(&thisray, PRIMARY, NULL, NULL);
330	gregl	2.25	if (castonly) {
331	schorsch	2.33	if (!localhit(&thisray, &thescene)) {
332	gregl	2.25	if (thisray.ro == &Aftplane) { /* clipped */
333			thisray.ro = NULL;
334			thisray.rot = FHUGE;
335			} else
336			sourcehit(&thisray);
337	schorsch	2.33	}
338	gregl	2.25	} else
339	greg	1.11	rayvalue(&thisray);
340	greg	2.16	printvals(&thisray);
341	greg	1.1	}
342
343
344	schorsch	2.37	static void
345			irrad( /* compute immediate irradiance value */
346			FVECT org,
347			FVECT dir
348			)
349	greg	1.1	{
350			register int i;
351
352			for (i = 0; i < 3; i++) {
353			thisray.rorg[i] = org[i] + dir[i];
354			thisray.rdir[i] = -dir[i];
355			}
356	greg	2.40	thisray.rmax = 0.0;
357			rayorigin(&thisray, PRIMARY, NULL, NULL);
358	greg	1.1	/* pretend we hit surface */
359	greg	2.16	thisray.rot = 1.0-1e-4;
360	greg	1.1	thisray.rod = 1.0;
361			VCOPY(thisray.ron, dir);
362			for (i = 0; i < 3; i++) /* fudge factor */
363			thisray.rop[i] = org[i] + 1e-4*dir[i];
364			/* compute and print */
365			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
366	greg	2.16	printvals(&thisray);
367			}
368
369
370	schorsch	2.37	static void
371			printvals( /* print requested ray values */
372			RAY *r
373			)
374	greg	2.16	{
375	schorsch	2.37	register oputf_t **tp;
376	greg	2.16
377			if (ray_out[0] == NULL)
378			return;
379			for (tp = ray_out; *tp != NULL; tp++)
380			(**tp)(r);
381	greg	1.1	if (outform == 'a')
382			putchar('\n');
383			}
384
385
386	schorsch	2.37	static int
387			getvec( /* get a vector from fp */
388			register FVECT vec,
389			int fmt,
390			FILE *fp
391			)
392	greg	1.1	{
393			static float vf[3];
394	greg	2.5	static double vd[3];
395	greg	1.19	char buf[32];
396			register int i;
397	greg	1.1
398			switch (fmt) {
399			case 'a': /* ascii */
400	greg	1.19	for (i = 0; i < 3; i++) {
401			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
402			!isflt(buf))
403			return(-1);
404			vec[i] = atof(buf);
405			}
406	greg	1.1	break;
407			case 'f': /* binary float */
408	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
409	greg	1.1	return(-1);
410			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
411			break;
412			case 'd': /* binary double */
413	greg	2.5	if (fread((char *)vd, sizeof(double), 3, fp) != 3)
414	greg	1.1	return(-1);
415	greg	2.5	vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
416	greg	1.1	break;
417	greg	2.6	default:
418			error(CONSISTENCY, "botched input format");
419	greg	1.1	}
420			return(0);
421			}
422
423
424	schorsch	2.37	static void
425			tranotify( /* record new modifier */
426			OBJECT obj
427			)
428	greg	2.15	{
429			static int hitlimit = 0;
430			register OBJREC *o = objptr(obj);
431			register char **tralp;
432
433	greg	2.27	if (obj == OVOID) { /* starting over */
434			traset[0] = 0;
435			hitlimit = 0;
436			return;
437			}
438	greg	2.15	if (hitlimit \|\| !ismodifier(o->otype))
439			return;
440			for (tralp = tralist; *tralp != NULL; tralp++)
441			if (!strcmp(o->oname, *tralp)) {
442			if (traset[0] >= MAXTSET) {
443			error(WARNING, "too many modifiers in trace list");
444			hitlimit++;
445			return; /* should this be fatal? */
446			}
447			insertelem(traset, obj);
448			return;
449			}
450			}
451
452
453	greg	2.27	static void
454	schorsch	2.37	ourtrace( /* print ray values */
455			RAY *r
456			)
457	greg	1.1	{
458	schorsch	2.37	register oputf_t **tp;
459	greg	1.1
460			if (every_out[0] == NULL)
461	greg	2.15	return;
462	greg	2.16	if (r->ro == NULL) {
463			if (traincl == 1)
464			return;
465			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
466	greg	1.1	return;
467			tabin(r);
468			for (tp = every_out; *tp != NULL; tp++)
469			(**tp)(r);
470	greg	2.41	if (outform == 'a')
471			putchar('\n');
472	greg	1.1	}
473
474
475	greg	2.27	static void
476	schorsch	2.37	tabin( /* tab in appropriate amount */
477			RAY *r
478			)
479	greg	1.1	{
480	greg	2.40	const RAY *rp;
481	greg	1.1
482			for (rp = r->parent; rp != NULL; rp = rp->parent)
483			putchar('\t');
484			}
485
486
487	greg	2.27	static void
488	schorsch	2.37	oputo( /* print origin */
489			RAY *r
490			)
491	greg	1.1	{
492			(*putreal)(r->rorg[0]);
493			(*putreal)(r->rorg[1]);
494			(*putreal)(r->rorg[2]);
495			}
496
497
498	greg	2.27	static void
499	schorsch	2.37	oputd( /* print direction */
500			RAY *r
501			)
502	greg	1.1	{
503			(*putreal)(r->rdir[0]);
504			(*putreal)(r->rdir[1]);
505			(*putreal)(r->rdir[2]);
506			}
507
508
509	greg	2.27	static void
510	schorsch	2.37	oputv( /* print value */
511			RAY *r
512			)
513	greg	1.1	{
514	greg	2.6	if (outform == 'c') {
515	greg	2.41	COLR cout;
516	greg	2.6	setcolr(cout, colval(r->rcol,RED),
517			colval(r->rcol,GRN),
518			colval(r->rcol,BLU));
519			fwrite((char *)cout, sizeof(cout), 1, stdout);
520			return;
521			}
522	greg	1.1	(*putreal)(colval(r->rcol,RED));
523			(*putreal)(colval(r->rcol,GRN));
524			(*putreal)(colval(r->rcol,BLU));
525			}
526
527
528	greg	2.27	static void
529	schorsch	2.37	oputl( /* print effective distance */
530			RAY *r
531			)
532	greg	1.1	{
533	greg	1.9	(*putreal)(r->rt);
534	greg	2.5	}
535
536
537	greg	2.27	static void
538	schorsch	2.37	oputL( /* print single ray length */
539			RAY *r
540			)
541	greg	2.5	{
542			(*putreal)(r->rot);
543	greg	1.1	}
544
545
546	greg	2.27	static void
547	schorsch	2.37	oputc( /* print local coordinates */
548			RAY *r
549			)
550	greg	2.29	{
551			(*putreal)(r->uv[0]);
552			(*putreal)(r->uv[1]);
553			}
554
555
556			static void
557	schorsch	2.37	oputp( /* print point */
558			RAY *r
559			)
560	greg	1.1	{
561			if (r->rot < FHUGE) {
562			(*putreal)(r->rop[0]);
563			(*putreal)(r->rop[1]);
564			(*putreal)(r->rop[2]);
565			} else {
566			(*putreal)(0.0);
567			(*putreal)(0.0);
568			(*putreal)(0.0);
569			}
570			}
571
572
573	greg	2.27	static void
574	schorsch	2.37	oputN( /* print unperturbed normal */
575			RAY *r
576			)
577	greg	1.1	{
578			if (r->rot < FHUGE) {
579			(*putreal)(r->ron[0]);
580			(*putreal)(r->ron[1]);
581			(*putreal)(r->ron[2]);
582			} else {
583			(*putreal)(0.0);
584			(*putreal)(0.0);
585			(*putreal)(0.0);
586			}
587	greg	2.9	}
588
589
590	greg	2.27	static void
591	schorsch	2.37	oputn( /* print perturbed normal */
592			RAY *r
593			)
594	greg	2.9	{
595			FVECT pnorm;
596
597			if (r->rot >= FHUGE) {
598			(*putreal)(0.0);
599			(*putreal)(0.0);
600			(*putreal)(0.0);
601			return;
602			}
603			raynormal(pnorm, r);
604			(*putreal)(pnorm[0]);
605			(*putreal)(pnorm[1]);
606			(*putreal)(pnorm[2]);
607	greg	1.1	}
608
609
610	greg	2.27	static void
611	schorsch	2.37	oputs( /* print name */
612			RAY *r
613			)
614	greg	1.1	{
615			if (r->ro != NULL)
616			fputs(r->ro->oname, stdout);
617			else
618			putchar('*');
619			putchar('\t');
620			}
621
622
623	greg	2.27	static void
624	schorsch	2.37	oputw( /* print weight */
625			RAY *r
626			)
627	greg	1.1	{
628			(*putreal)(r->rweight);
629			}
630
631
632	greg	2.27	static void
633	greg	2.40	oputW( /* print contribution */
634			RAY *r
635			)
636			{
637			COLOR contr;
638
639			raycontrib(contr, r, PRIMARY);
640			(*putreal)(colval(contr,RED));
641			(*putreal)(colval(contr,GRN));
642			(*putreal)(colval(contr,BLU));
643			}
644
645
646			static void
647	schorsch	2.37	oputm( /* print modifier */
648			RAY *r
649			)
650	greg	1.1	{
651			if (r->ro != NULL)
652	greg	2.23	if (r->ro->omod != OVOID)
653			fputs(objptr(r->ro->omod)->oname, stdout);
654			else
655			fputs(VOIDID, stdout);
656	greg	1.1	else
657			putchar('*');
658			putchar('\t');
659			}
660
661
662	greg	2.27	static void
663	greg	2.39	oputM( /* print material */
664			RAY *r
665			)
666			{
667			OBJREC *mat;
668
669			if (r->ro != NULL) {
670			if ((mat = findmaterial(r->ro)) != NULL)
671			fputs(mat->oname, stdout);
672			else
673			fputs(VOIDID, stdout);
674			} else
675			putchar('*');
676			putchar('\t');
677			}
678
679
680			static void
681	greg	2.42	oputtilde( /* output tilde (spacer) */
682	greg	2.41	RAY *r
683			)
684			{
685	greg	2.42	fputs("~\t", stdout);
686	greg	2.41	}
687
688
689			static void
690	schorsch	2.37	puta( /* print ascii value */
691			double v
692			)
693	greg	1.1	{
694			printf("%e\t", v);
695			}
696
697
698	greg	2.27	static void
699	greg	1.1	putd(v) /* print binary double */
700			double v;
701			{
702	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
703	greg	1.1	}
704
705
706	greg	2.27	static void
707	greg	1.1	putf(v) /* print binary float */
708			double v;
709			{
710			float f = v;
711
712	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
713	greg	1.1	}