src/rt/rtrace.c

#ifndef lint
static const char       RCSid[] = "$Id: rtrace.c,v 2.39 2005/04/14 18:04:12 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 = 8;                      /* 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;

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
)
{
        long  vcount = hresolu>1 ? 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);
        }
#ifdef _WIN32
        if (inform != 'a')
                SET_FILE_BINARY(fp);
#endif
                                        /* 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 <= 0) {
                                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 == 0) {
                                fflush(stdout);
                                nextflush = hresolu;
                        }
                }
                if (ferror(stdout))
                        error(SYSTEM, "write error");
                if (--vcount == 0)                      /* check for end */
                        break;
        }
        fflush(stdout);
        if (vcount > 0)
                error(USER, "read error");
        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 */
                        trace_sources();
                        /* fall through */
                case 't':                               /* trace */
                        *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 requires -aa 0 -as 0");
                        break;
                case 'm':                               /* modifier */
                        *table++ = oputm;
                        break;
                case 'M':                               /* material */
                        *table++ = oputM;
                        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);
        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
)
{
        COLR  cout;
        
        if (outform == 'c') {
                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;
        COLR    cout;

        raycontrib(contr, r, PRIMARY);
        if (outform == 'c') {
                setcolr(cout,   colval(contr,RED),
                                colval(contr,GRN),
                                colval(contr,BLU));
                fwrite((char *)cout, sizeof(cout), 1, stdout);
                return;
        }
        (*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
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:	2.40
Committed:	Tue Apr 19 01:15:06 2005 UTC (19 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.39:	+50 -7 lines
Log Message:	Extensive changes to enable rtrace -oTW option for tracking ray contributions
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.40	static const char RCSid[] = "$Id: rtrace.c,v 2.39 2005/04/14 18:04:12 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	2.34	int maxdepth = 8; /* maximum recursion depth */
78			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			oputn, oputN, oputs, oputw, oputW, oputm, oputM;
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			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
152			long nextflush = hresolu;
153			FILE *fp;
154	gregl	2.25	double d;
155	greg	1.2	FVECT orig, direc;
156	greg	1.1	/* set up input */
157			if (fname == NULL)
158			fp = stdin;
159			else if ((fp = fopen(fname, "r")) == NULL) {
160			sprintf(errmsg, "cannot open input file \"%s\"", fname);
161			error(SYSTEM, errmsg);
162			}
163	schorsch	2.30	#ifdef _WIN32
164	greg	2.8	if (inform != 'a')
165	schorsch	2.30	SET_FILE_BINARY(fp);
166	greg	2.8	#endif
167	greg	1.1	/* set up output */
168	greg	2.16	setoutput(outvals);
169	greg	1.1	switch (outform) {
170			case 'a': putreal = puta; break;
171			case 'f': putreal = putf; break;
172			case 'd': putreal = putd; break;
173	greg	2.6	case 'c':
174			if (strcmp(outvals, "v"))
175			error(USER, "color format with value output only");
176			break;
177			default:
178			error(CONSISTENCY, "botched output format");
179	greg	1.1	}
180	greg	2.12	if (hresolu > 0) {
181			if (vresolu > 0)
182			fprtresolu(hresolu, vresolu, stdout);
183			fflush(stdout);
184			}
185	greg	1.1	/* process file */
186			while (getvec(orig, inform, fp) == 0 &&
187			getvec(direc, inform, fp) == 0) {
188
189	gregl	2.25	d = normalize(direc);
190			if (d == 0.0) { /* zero ==> flush */
191	gregl	2.24	bogusray();
192	gregl	2.26	if (--nextflush <= 0 \|\| vcount <= 0) {
193	gregl	2.24	fflush(stdout);
194			nextflush = hresolu;
195			}
196			} else {
197			samplendx++;
198	greg	1.1	/* compute and print */
199	gregl	2.24	if (imm_irrad)
200			irrad(orig, direc);
201			else
202	gregl	2.25	rad(orig, direc, lim_dist ? d : 0.0);
203	greg	1.7	/* flush if time */
204	gregl	2.24	if (--nextflush == 0) {
205			fflush(stdout);
206			nextflush = hresolu;
207			}
208	greg	1.1	}
209			if (ferror(stdout))
210			error(SYSTEM, "write error");
211			if (--vcount == 0) /* check for end */
212			break;
213			}
214	greg	2.12	fflush(stdout);
215	greg	1.1	if (vcount > 0)
216			error(USER, "read error");
217	greg	2.12	if (fname != NULL)
218			fclose(fp);
219	greg	1.1	}
220
221
222	schorsch	2.37	static void
223	greg	2.40	trace_sources(void) /* trace rays to light sources, also */
224			{
225			int sn;
226
227			for (sn = 0; sn < nsources; sn++)
228			source[sn].sflags \|= SFOLLOW;
229			}
230
231
232			static void
233	schorsch	2.37	setoutput( /* set up output tables */
234			register char *vs
235			)
236	greg	1.1	{
237	schorsch	2.37	register oputf_t **table = ray_out;
238	greg	1.1
239	greg	1.11	castonly = 1;
240	greg	1.1	while (*vs)
241			switch (*vs++) {
242	greg	2.40	case 'T': /* trace sources */
243			trace_sources();
244			/* fall through */
245	greg	1.1	case 't': /* trace */
246			*table = NULL;
247			table = every_out;
248			trace = ourtrace;
249	greg	1.11	castonly = 0;
250	greg	1.1	break;
251			case 'o': /* origin */
252			*table++ = oputo;
253			break;
254			case 'd': /* direction */
255			*table++ = oputd;
256			break;
257			case 'v': /* value */
258			*table++ = oputv;
259	greg	1.11	castonly = 0;
260	greg	1.1	break;
261	greg	2.5	case 'l': /* effective distance */
262	greg	1.1	*table++ = oputl;
263	greg	1.11	castonly = 0;
264	greg	1.1	break;
265	greg	2.29	case 'c': /* local coordinates */
266			*table++ = oputc;
267			break;
268	greg	2.5	case 'L': /* single ray length */
269			*table++ = oputL;
270			break;
271	greg	1.1	case 'p': /* point */
272			*table++ = oputp;
273			break;
274	greg	2.9	case 'n': /* perturbed normal */
275	greg	1.1	*table++ = oputn;
276	greg	2.9	castonly = 0;
277	greg	1.1	break;
278	greg	2.9	case 'N': /* unperturbed normal */
279			*table++ = oputN;
280			break;
281	greg	1.1	case 's': /* surface */
282			*table++ = oputs;
283			break;
284			case 'w': /* weight */
285			*table++ = oputw;
286			break;
287	greg	2.40	case 'W': /* coefficient */
288			*table++ = oputW;
289			if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
290			error(WARNING,
291			"-otW accuracy requires -aa 0 -as 0");
292			break;
293	greg	1.1	case 'm': /* modifier */
294			*table++ = oputm;
295			break;
296	greg	2.39	case 'M': /* material */
297			*table++ = oputM;
298			break;
299	greg	1.1	}
300			*table = NULL;
301	gregl	2.24	}
302
303
304	schorsch	2.37	static void
305			bogusray(void) /* print out empty record */
306	gregl	2.24	{
307			thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
308			thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
309	greg	2.40	thisray.rmax = 0.0;
310			rayorigin(&thisray, PRIMARY, NULL, NULL);
311	gregl	2.24	printvals(&thisray);
312	greg	1.1	}
313
314
315	schorsch	2.37	static void
316			rad( /* compute and print ray value(s) */
317			FVECT org,
318			FVECT dir,
319			double dmax
320			)
321	greg	1.1	{
322			VCOPY(thisray.rorg, org);
323			VCOPY(thisray.rdir, dir);
324	gregl	2.25	thisray.rmax = dmax;
325	greg	2.40	rayorigin(&thisray, PRIMARY, NULL, NULL);
326	gregl	2.25	if (castonly) {
327	schorsch	2.33	if (!localhit(&thisray, &thescene)) {
328	gregl	2.25	if (thisray.ro == &Aftplane) { /* clipped */
329			thisray.ro = NULL;
330			thisray.rot = FHUGE;
331			} else
332			sourcehit(&thisray);
333	schorsch	2.33	}
334	gregl	2.25	} else
335	greg	1.11	rayvalue(&thisray);
336	greg	2.16	printvals(&thisray);
337	greg	1.1	}
338
339
340	schorsch	2.37	static void
341			irrad( /* compute immediate irradiance value */
342			FVECT org,
343			FVECT dir
344			)
345	greg	1.1	{
346			register int i;
347
348			for (i = 0; i < 3; i++) {
349			thisray.rorg[i] = org[i] + dir[i];
350			thisray.rdir[i] = -dir[i];
351			}
352	greg	2.40	thisray.rmax = 0.0;
353			rayorigin(&thisray, PRIMARY, NULL, NULL);
354	greg	1.1	/* pretend we hit surface */
355	greg	2.16	thisray.rot = 1.0-1e-4;
356	greg	1.1	thisray.rod = 1.0;
357			VCOPY(thisray.ron, dir);
358			for (i = 0; i < 3; i++) /* fudge factor */
359			thisray.rop[i] = org[i] + 1e-4*dir[i];
360			/* compute and print */
361			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
362	greg	2.16	printvals(&thisray);
363			}
364
365
366	schorsch	2.37	static void
367			printvals( /* print requested ray values */
368			RAY *r
369			)
370	greg	2.16	{
371	schorsch	2.37	register oputf_t **tp;
372	greg	2.16
373			if (ray_out[0] == NULL)
374			return;
375			for (tp = ray_out; *tp != NULL; tp++)
376			(**tp)(r);
377	greg	1.1	if (outform == 'a')
378			putchar('\n');
379			}
380
381
382	schorsch	2.37	static int
383			getvec( /* get a vector from fp */
384			register FVECT vec,
385			int fmt,
386			FILE *fp
387			)
388	greg	1.1	{
389			static float vf[3];
390	greg	2.5	static double vd[3];
391	greg	1.19	char buf[32];
392			register int i;
393	greg	1.1
394			switch (fmt) {
395			case 'a': /* ascii */
396	greg	1.19	for (i = 0; i < 3; i++) {
397			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
398			!isflt(buf))
399			return(-1);
400			vec[i] = atof(buf);
401			}
402	greg	1.1	break;
403			case 'f': /* binary float */
404	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
405	greg	1.1	return(-1);
406			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
407			break;
408			case 'd': /* binary double */
409	greg	2.5	if (fread((char *)vd, sizeof(double), 3, fp) != 3)
410	greg	1.1	return(-1);
411	greg	2.5	vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
412	greg	1.1	break;
413	greg	2.6	default:
414			error(CONSISTENCY, "botched input format");
415	greg	1.1	}
416			return(0);
417			}
418
419
420	schorsch	2.37	static void
421			tranotify( /* record new modifier */
422			OBJECT obj
423			)
424	greg	2.15	{
425			static int hitlimit = 0;
426			register OBJREC *o = objptr(obj);
427			register char **tralp;
428
429	greg	2.27	if (obj == OVOID) { /* starting over */
430			traset[0] = 0;
431			hitlimit = 0;
432			return;
433			}
434	greg	2.15	if (hitlimit \|\| !ismodifier(o->otype))
435			return;
436			for (tralp = tralist; *tralp != NULL; tralp++)
437			if (!strcmp(o->oname, *tralp)) {
438			if (traset[0] >= MAXTSET) {
439			error(WARNING, "too many modifiers in trace list");
440			hitlimit++;
441			return; /* should this be fatal? */
442			}
443			insertelem(traset, obj);
444			return;
445			}
446			}
447
448
449	greg	2.27	static void
450	schorsch	2.37	ourtrace( /* print ray values */
451			RAY *r
452			)
453	greg	1.1	{
454	schorsch	2.37	register oputf_t **tp;
455	greg	1.1
456			if (every_out[0] == NULL)
457	greg	2.15	return;
458	greg	2.16	if (r->ro == NULL) {
459			if (traincl == 1)
460			return;
461			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
462	greg	1.1	return;
463			tabin(r);
464			for (tp = every_out; *tp != NULL; tp++)
465			(**tp)(r);
466			putchar('\n');
467			}
468
469
470	greg	2.27	static void
471	schorsch	2.37	tabin( /* tab in appropriate amount */
472			RAY *r
473			)
474	greg	1.1	{
475	greg	2.40	const RAY *rp;
476	greg	1.1
477			for (rp = r->parent; rp != NULL; rp = rp->parent)
478			putchar('\t');
479			}
480
481
482	greg	2.27	static void
483	schorsch	2.37	oputo( /* print origin */
484			RAY *r
485			)
486	greg	1.1	{
487			(*putreal)(r->rorg[0]);
488			(*putreal)(r->rorg[1]);
489			(*putreal)(r->rorg[2]);
490			}
491
492
493	greg	2.27	static void
494	schorsch	2.37	oputd( /* print direction */
495			RAY *r
496			)
497	greg	1.1	{
498			(*putreal)(r->rdir[0]);
499			(*putreal)(r->rdir[1]);
500			(*putreal)(r->rdir[2]);
501			}
502
503
504	greg	2.27	static void
505	schorsch	2.37	oputv( /* print value */
506			RAY *r
507			)
508	greg	1.1	{
509	greg	2.6	COLR cout;
510
511			if (outform == 'c') {
512			setcolr(cout, colval(r->rcol,RED),
513			colval(r->rcol,GRN),
514			colval(r->rcol,BLU));
515			fwrite((char *)cout, sizeof(cout), 1, stdout);
516			return;
517			}
518	greg	1.1	(*putreal)(colval(r->rcol,RED));
519			(*putreal)(colval(r->rcol,GRN));
520			(*putreal)(colval(r->rcol,BLU));
521			}
522
523
524	greg	2.27	static void
525	schorsch	2.37	oputl( /* print effective distance */
526			RAY *r
527			)
528	greg	1.1	{
529	greg	1.9	(*putreal)(r->rt);
530	greg	2.5	}
531
532
533	greg	2.27	static void
534	schorsch	2.37	oputL( /* print single ray length */
535			RAY *r
536			)
537	greg	2.5	{
538			(*putreal)(r->rot);
539	greg	1.1	}
540
541
542	greg	2.27	static void
543	schorsch	2.37	oputc( /* print local coordinates */
544			RAY *r
545			)
546	greg	2.29	{
547			(*putreal)(r->uv[0]);
548			(*putreal)(r->uv[1]);
549			}
550
551
552			static void
553	schorsch	2.37	oputp( /* print point */
554			RAY *r
555			)
556	greg	1.1	{
557			if (r->rot < FHUGE) {
558			(*putreal)(r->rop[0]);
559			(*putreal)(r->rop[1]);
560			(*putreal)(r->rop[2]);
561			} else {
562			(*putreal)(0.0);
563			(*putreal)(0.0);
564			(*putreal)(0.0);
565			}
566			}
567
568
569	greg	2.27	static void
570	schorsch	2.37	oputN( /* print unperturbed normal */
571			RAY *r
572			)
573	greg	1.1	{
574			if (r->rot < FHUGE) {
575			(*putreal)(r->ron[0]);
576			(*putreal)(r->ron[1]);
577			(*putreal)(r->ron[2]);
578			} else {
579			(*putreal)(0.0);
580			(*putreal)(0.0);
581			(*putreal)(0.0);
582			}
583	greg	2.9	}
584
585
586	greg	2.27	static void
587	schorsch	2.37	oputn( /* print perturbed normal */
588			RAY *r
589			)
590	greg	2.9	{
591			FVECT pnorm;
592
593			if (r->rot >= FHUGE) {
594			(*putreal)(0.0);
595			(*putreal)(0.0);
596			(*putreal)(0.0);
597			return;
598			}
599			raynormal(pnorm, r);
600			(*putreal)(pnorm[0]);
601			(*putreal)(pnorm[1]);
602			(*putreal)(pnorm[2]);
603	greg	1.1	}
604
605
606	greg	2.27	static void
607	schorsch	2.37	oputs( /* print name */
608			RAY *r
609			)
610	greg	1.1	{
611			if (r->ro != NULL)
612			fputs(r->ro->oname, stdout);
613			else
614			putchar('*');
615			putchar('\t');
616			}
617
618
619	greg	2.27	static void
620	schorsch	2.37	oputw( /* print weight */
621			RAY *r
622			)
623	greg	1.1	{
624			(*putreal)(r->rweight);
625			}
626
627
628	greg	2.27	static void
629	greg	2.40	oputW( /* print contribution */
630			RAY *r
631			)
632			{
633			COLOR contr;
634			COLR cout;
635
636			raycontrib(contr, r, PRIMARY);
637			if (outform == 'c') {
638			setcolr(cout, colval(contr,RED),
639			colval(contr,GRN),
640			colval(contr,BLU));
641			fwrite((char *)cout, sizeof(cout), 1, stdout);
642			return;
643			}
644			(*putreal)(colval(contr,RED));
645			(*putreal)(colval(contr,GRN));
646			(*putreal)(colval(contr,BLU));
647			}
648
649
650			static void
651	schorsch	2.37	oputm( /* print modifier */
652			RAY *r
653			)
654	greg	1.1	{
655			if (r->ro != NULL)
656	greg	2.23	if (r->ro->omod != OVOID)
657			fputs(objptr(r->ro->omod)->oname, stdout);
658			else
659			fputs(VOIDID, stdout);
660	greg	1.1	else
661			putchar('*');
662			putchar('\t');
663			}
664
665
666	greg	2.27	static void
667	greg	2.39	oputM( /* print material */
668			RAY *r
669			)
670			{
671			OBJREC *mat;
672
673			if (r->ro != NULL) {
674			if ((mat = findmaterial(r->ro)) != NULL)
675			fputs(mat->oname, stdout);
676			else
677			fputs(VOIDID, stdout);
678			} else
679			putchar('*');
680			putchar('\t');
681			}
682
683
684			static void
685	schorsch	2.37	puta( /* print ascii value */
686			double v
687			)
688	greg	1.1	{
689			printf("%e\t", v);
690			}
691
692
693	greg	2.27	static void
694	greg	1.1	putd(v) /* print binary double */
695			double v;
696			{
697	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
698	greg	1.1	}
699
700
701	greg	2.27	static void
702	greg	1.1	putf(v) /* print binary float */
703			double v;
704			{
705			float f = v;
706
707	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
708	greg	1.1	}