src/rt/rtrace.c

#ifndef lint
static const char       RCSid[] = "$Id: rtrace.c,v 2.46 2005/06/10 20:44:00 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? */

int  rand_samp = 0;                     /* pure Monte Carlo sampling? */

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

char  *tralist[128];                    /* list of modifers to trace (or no) */
int  traincl = -1;                      /* include == 1, exclude == 0 */
#ifndef  MAXTSET
#define  MAXTSET        1024            /* maximum number in trace set */
#endif
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 = rand_samp ? random() : samplendx+1;
                                                        /* 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:	2.47
Committed:	Mon Jun 13 20:07:56 2005 UTC (18 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.46:	+4 -2 lines
Log Message:	Added -R option for pure Monte Carlo rendering, replacing -DMC compile option
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.47	static const char RCSid[] = "$Id: rtrace.c,v 2.46 2005/06/10 20:44:00 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	greg	2.47	int rand_samp = 0; /* pure Monte Carlo sampling? */
50
51	greg	2.27	void (trace)() = NULL; / trace call */
52
53	greg	2.15	char tralist[128]; / list of modifers to trace (or no) */
54			int traincl = -1; /* include == 1, exclude == 0 */
55	greg	2.46	#ifndef MAXTSET
56			#define MAXTSET 1024 /* maximum number in trace set */
57			#endif
58	greg	2.15	OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */
59
60	greg	1.1	int hresolu = 0; /* horizontal (scan) size */
61			int vresolu = 0; /* vertical resolution */
62
63			double dstrsrc = 0.0; /* square source distribution */
64	greg	2.35	double shadthresh = .03; /* shadow threshold */
65			double shadcert = .75; /* shadow certainty */
66	greg	2.19	int directrelay = 2; /* number of source relays */
67	greg	1.17	int vspretest = 512; /* virtual source pretest density */
68	greg	2.10	int directvis = 1; /* sources visible? */
69	greg	2.19	double srcsizerat = .2; /* maximum ratio source size/dist. */
70	greg	2.20
71			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
72	greg	2.22	COLOR salbedo = BLKCOLOR; /* global scattering albedo */
73	greg	2.20	double seccg = 0.; /* global scattering eccentricity */
74			double ssampdist = 0.; /* scatter sampling distance */
75	greg	1.1
76	greg	2.4	double specthresh = .15; /* specular sampling threshold */
77	greg	2.3	double specjitter = 1.; /* specular sampling jitter */
78
79	greg	2.18	int backvis = 1; /* back face visibility */
80
81	greg	2.44	int maxdepth = -10; /* maximum recursion depth */
82	greg	2.34	double minweight = 2e-3; /* minimum ray weight */
83	greg	1.1
84	greg	2.27	char ambfile = NULL; / ambient file name */
85	greg	1.1	COLOR ambval = BLKCOLOR; /* ambient value */
86	greg	2.21	int ambvwt = 0; /* initial weight for ambient value */
87	greg	2.36	double ambacc = 0.15; /* ambient accuracy */
88	greg	2.34	int ambres = 256; /* ambient resolution */
89			int ambdiv = 1024; /* ambient divisions */
90			int ambssamp = 512; /* ambient super-samples */
91	greg	1.1	int ambounce = 0; /* ambient bounces */
92	greg	2.38	char amblist[AMBLLEN]; / ambient include/exclude list */
93	greg	1.1	int ambincl = -1; /* include == 1, exclude == 0 */
94
95	schorsch	2.37	static int castonly = 0;
96	gregl	2.25
97	greg	1.1	static RAY thisray; /* for our convenience */
98
99	schorsch	2.37	typedef void putf_t(double v);
100			static putf_t puta, putd, putf;
101	greg	1.1
102	schorsch	2.37	typedef void oputf_t(RAY *r);
103	greg	2.40	static oputf_t oputo, oputd, oputv, oputl, oputL, oputc, oputp,
104	greg	2.42	oputn, oputN, oputs, oputw, oputW, oputm, oputM, oputtilde;
105	schorsch	2.37
106			static void setoutput(char *vs);
107			static void tranotify(OBJECT obj);
108			static void bogusray(void);
109			static void rad(FVECT org, FVECT dir, double dmax);
110			static void irrad(FVECT org, FVECT dir);
111			static void printvals(RAY *r);
112			static int getvec(FVECT vec, int fmt, FILE *fp);
113			static void tabin(RAY *r);
114			static void ourtrace(RAY *r);
115	greg	1.1
116	schorsch	2.37	static oputf_t ray_out[16], every_out[16];
117			static putf_t *putreal;
118	greg	2.27
119	schorsch	2.37	void (*addobjnotify[])() = {ambnotify, tranotify, NULL};
120	greg	1.1
121
122	greg	2.27	void
123	schorsch	2.37	quit( /* quit program */
124			int code
125			)
126	greg	1.1	{
127	schorsch	2.31	#ifndef NON_POSIX /* XXX we don't clean up elsewhere? */
128	greg	2.11	headclean(); /* delete header file */
129			pfclean(); /* clean up persist files */
130			#endif
131	greg	1.1	exit(code);
132			}
133
134
135	schorsch	2.37	extern char *
136			formstr( /* return format identifier */
137			int f
138			)
139	greg	2.6	{
140			switch (f) {
141			case 'a': return("ascii");
142			case 'f': return("float");
143			case 'd': return("double");
144			case 'c': return(COLRFMT);
145			}
146			return("unknown");
147			}
148
149
150	schorsch	2.37	extern void
151			rtrace( /* trace rays from file */
152			char *fname
153			)
154	greg	1.1	{
155	greg	2.45	unsigned long vcount = (hresolu > 1) ? (unsigned long)hresolu*vresolu
156			: vresolu;
157	greg	1.1	long nextflush = hresolu;
158			FILE *fp;
159	gregl	2.25	double d;
160	greg	1.2	FVECT orig, direc;
161	greg	1.1	/* set up input */
162			if (fname == NULL)
163			fp = stdin;
164			else if ((fp = fopen(fname, "r")) == NULL) {
165			sprintf(errmsg, "cannot open input file \"%s\"", fname);
166			error(SYSTEM, errmsg);
167			}
168	greg	2.8	if (inform != 'a')
169	schorsch	2.30	SET_FILE_BINARY(fp);
170	greg	1.1	/* set up output */
171	greg	2.16	setoutput(outvals);
172	greg	1.1	switch (outform) {
173			case 'a': putreal = puta; break;
174			case 'f': putreal = putf; break;
175			case 'd': putreal = putd; break;
176	greg	2.6	case 'c':
177			if (strcmp(outvals, "v"))
178			error(USER, "color format with value output only");
179			break;
180			default:
181			error(CONSISTENCY, "botched output format");
182	greg	1.1	}
183	greg	2.12	if (hresolu > 0) {
184			if (vresolu > 0)
185			fprtresolu(hresolu, vresolu, stdout);
186			fflush(stdout);
187			}
188	greg	1.1	/* process file */
189			while (getvec(orig, inform, fp) == 0 &&
190			getvec(direc, inform, fp) == 0) {
191
192	gregl	2.25	d = normalize(direc);
193			if (d == 0.0) { /* zero ==> flush */
194	gregl	2.24	bogusray();
195	greg	2.45	if (--nextflush <= 0 \|\| !vcount) {
196	gregl	2.24	fflush(stdout);
197			nextflush = hresolu;
198			}
199			} else {
200	greg	2.47	samplendx = rand_samp ? random() : samplendx+1;
201	greg	1.1	/* compute and print */
202	gregl	2.24	if (imm_irrad)
203			irrad(orig, direc);
204			else
205	gregl	2.25	rad(orig, direc, lim_dist ? d : 0.0);
206	greg	1.7	/* flush if time */
207	greg	2.45	if (!--nextflush) {
208	gregl	2.24	fflush(stdout);
209			nextflush = hresolu;
210			}
211	greg	1.1	}
212			if (ferror(stdout))
213			error(SYSTEM, "write error");
214	greg	2.45	if (vcount && !--vcount) /* check for end */
215	greg	1.1	break;
216			}
217	greg	2.12	fflush(stdout);
218	greg	2.45	if (vcount)
219	greg	2.42	error(USER, "unexpected EOF on input");
220	greg	2.12	if (fname != NULL)
221			fclose(fp);
222	greg	1.1	}
223
224
225	schorsch	2.37	static void
226	greg	2.40	trace_sources(void) /* trace rays to light sources, also */
227			{
228			int sn;
229
230			for (sn = 0; sn < nsources; sn++)
231			source[sn].sflags \|= SFOLLOW;
232			}
233
234
235			static void
236	schorsch	2.37	setoutput( /* set up output tables */
237			register char *vs
238			)
239	greg	1.1	{
240	schorsch	2.37	register oputf_t **table = ray_out;
241	greg	1.1
242	greg	1.11	castonly = 1;
243	greg	1.1	while (*vs)
244			switch (*vs++) {
245	greg	2.40	case 'T': /* trace sources */
246	greg	2.42	if (!*vs) break;
247	greg	2.40	trace_sources();
248			/* fall through */
249	greg	1.1	case 't': /* trace */
250	greg	2.42	if (!*vs) break;
251	greg	1.1	*table = NULL;
252			table = every_out;
253			trace = ourtrace;
254	greg	1.11	castonly = 0;
255	greg	1.1	break;
256			case 'o': /* origin */
257			*table++ = oputo;
258			break;
259			case 'd': /* direction */
260			*table++ = oputd;
261			break;
262			case 'v': /* value */
263			*table++ = oputv;
264	greg	1.11	castonly = 0;
265	greg	1.1	break;
266	greg	2.5	case 'l': /* effective distance */
267	greg	1.1	*table++ = oputl;
268	greg	1.11	castonly = 0;
269	greg	1.1	break;
270	greg	2.29	case 'c': /* local coordinates */
271			*table++ = oputc;
272			break;
273	greg	2.5	case 'L': /* single ray length */
274			*table++ = oputL;
275			break;
276	greg	1.1	case 'p': /* point */
277			*table++ = oputp;
278			break;
279	greg	2.9	case 'n': /* perturbed normal */
280	greg	1.1	*table++ = oputn;
281	greg	2.9	castonly = 0;
282	greg	1.1	break;
283	greg	2.9	case 'N': /* unperturbed normal */
284			*table++ = oputN;
285			break;
286	greg	1.1	case 's': /* surface */
287			*table++ = oputs;
288			break;
289			case 'w': /* weight */
290			*table++ = oputw;
291			break;
292	greg	2.40	case 'W': /* coefficient */
293			*table++ = oputW;
294			if (ambounce > 0 && (ambacc > FTINY \|\| ambssamp > 0))
295			error(WARNING,
296	greg	2.41	"-otW accuracy depends on -aa 0 -as 0");
297	greg	2.40	break;
298	greg	1.1	case 'm': /* modifier */
299			*table++ = oputm;
300			break;
301	greg	2.39	case 'M': /* material */
302			*table++ = oputM;
303			break;
304	greg	2.42	case '~': /* tilde */
305			*table++ = oputtilde;
306	greg	2.41	break;
307	greg	1.1	}
308			*table = NULL;
309	gregl	2.24	}
310
311
312	schorsch	2.37	static void
313			bogusray(void) /* print out empty record */
314	gregl	2.24	{
315			thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
316			thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
317	greg	2.40	thisray.rmax = 0.0;
318			rayorigin(&thisray, PRIMARY, NULL, NULL);
319	gregl	2.24	printvals(&thisray);
320	greg	1.1	}
321
322
323	schorsch	2.37	static void
324			rad( /* compute and print ray value(s) */
325			FVECT org,
326			FVECT dir,
327			double dmax
328			)
329	greg	1.1	{
330			VCOPY(thisray.rorg, org);
331			VCOPY(thisray.rdir, dir);
332	gregl	2.25	thisray.rmax = dmax;
333	greg	2.40	rayorigin(&thisray, PRIMARY, NULL, NULL);
334	gregl	2.25	if (castonly) {
335	schorsch	2.33	if (!localhit(&thisray, &thescene)) {
336	gregl	2.25	if (thisray.ro == &Aftplane) { /* clipped */
337			thisray.ro = NULL;
338			thisray.rot = FHUGE;
339			} else
340			sourcehit(&thisray);
341	schorsch	2.33	}
342	gregl	2.25	} else
343	greg	1.11	rayvalue(&thisray);
344	greg	2.16	printvals(&thisray);
345	greg	1.1	}
346
347
348	schorsch	2.37	static void
349			irrad( /* compute immediate irradiance value */
350			FVECT org,
351			FVECT dir
352			)
353	greg	1.1	{
354			register int i;
355
356			for (i = 0; i < 3; i++) {
357			thisray.rorg[i] = org[i] + dir[i];
358			thisray.rdir[i] = -dir[i];
359			}
360	greg	2.40	thisray.rmax = 0.0;
361			rayorigin(&thisray, PRIMARY, NULL, NULL);
362	greg	1.1	/* pretend we hit surface */
363	greg	2.16	thisray.rot = 1.0-1e-4;
364	greg	1.1	thisray.rod = 1.0;
365			VCOPY(thisray.ron, dir);
366			for (i = 0; i < 3; i++) /* fudge factor */
367			thisray.rop[i] = org[i] + 1e-4*dir[i];
368			/* compute and print */
369			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
370	greg	2.16	printvals(&thisray);
371			}
372
373
374	schorsch	2.37	static void
375			printvals( /* print requested ray values */
376			RAY *r
377			)
378	greg	2.16	{
379	schorsch	2.37	register oputf_t **tp;
380	greg	2.16
381			if (ray_out[0] == NULL)
382			return;
383			for (tp = ray_out; *tp != NULL; tp++)
384			(**tp)(r);
385	greg	1.1	if (outform == 'a')
386			putchar('\n');
387			}
388
389
390	schorsch	2.37	static int
391			getvec( /* get a vector from fp */
392			register FVECT vec,
393			int fmt,
394			FILE *fp
395			)
396	greg	1.1	{
397			static float vf[3];
398	greg	2.5	static double vd[3];
399	greg	1.19	char buf[32];
400			register int i;
401	greg	1.1
402			switch (fmt) {
403			case 'a': /* ascii */
404	greg	1.19	for (i = 0; i < 3; i++) {
405			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
406			!isflt(buf))
407			return(-1);
408			vec[i] = atof(buf);
409			}
410	greg	1.1	break;
411			case 'f': /* binary float */
412	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
413	greg	1.1	return(-1);
414			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
415			break;
416			case 'd': /* binary double */
417	greg	2.5	if (fread((char *)vd, sizeof(double), 3, fp) != 3)
418	greg	1.1	return(-1);
419	greg	2.5	vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
420	greg	1.1	break;
421	greg	2.6	default:
422			error(CONSISTENCY, "botched input format");
423	greg	1.1	}
424			return(0);
425			}
426
427
428	schorsch	2.37	static void
429			tranotify( /* record new modifier */
430			OBJECT obj
431			)
432	greg	2.15	{
433			static int hitlimit = 0;
434			register OBJREC *o = objptr(obj);
435			register char **tralp;
436
437	greg	2.27	if (obj == OVOID) { /* starting over */
438			traset[0] = 0;
439			hitlimit = 0;
440			return;
441			}
442	greg	2.15	if (hitlimit \|\| !ismodifier(o->otype))
443			return;
444			for (tralp = tralist; *tralp != NULL; tralp++)
445			if (!strcmp(o->oname, *tralp)) {
446			if (traset[0] >= MAXTSET) {
447			error(WARNING, "too many modifiers in trace list");
448			hitlimit++;
449			return; /* should this be fatal? */
450			}
451			insertelem(traset, obj);
452			return;
453			}
454			}
455
456
457	greg	2.27	static void
458	schorsch	2.37	ourtrace( /* print ray values */
459			RAY *r
460			)
461	greg	1.1	{
462	schorsch	2.37	register oputf_t **tp;
463	greg	1.1
464			if (every_out[0] == NULL)
465	greg	2.15	return;
466	greg	2.16	if (r->ro == NULL) {
467			if (traincl == 1)
468			return;
469			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
470	greg	1.1	return;
471			tabin(r);
472			for (tp = every_out; *tp != NULL; tp++)
473			(**tp)(r);
474	greg	2.41	if (outform == 'a')
475			putchar('\n');
476	greg	1.1	}
477
478
479	greg	2.27	static void
480	schorsch	2.37	tabin( /* tab in appropriate amount */
481			RAY *r
482			)
483	greg	1.1	{
484	greg	2.40	const RAY *rp;
485	greg	1.1
486			for (rp = r->parent; rp != NULL; rp = rp->parent)
487			putchar('\t');
488			}
489
490
491	greg	2.27	static void
492	schorsch	2.37	oputo( /* print origin */
493			RAY *r
494			)
495	greg	1.1	{
496			(*putreal)(r->rorg[0]);
497			(*putreal)(r->rorg[1]);
498			(*putreal)(r->rorg[2]);
499			}
500
501
502	greg	2.27	static void
503	schorsch	2.37	oputd( /* print direction */
504			RAY *r
505			)
506	greg	1.1	{
507			(*putreal)(r->rdir[0]);
508			(*putreal)(r->rdir[1]);
509			(*putreal)(r->rdir[2]);
510			}
511
512
513	greg	2.27	static void
514	schorsch	2.37	oputv( /* print value */
515			RAY *r
516			)
517	greg	1.1	{
518	greg	2.6	if (outform == 'c') {
519	greg	2.41	COLR cout;
520	greg	2.6	setcolr(cout, colval(r->rcol,RED),
521			colval(r->rcol,GRN),
522			colval(r->rcol,BLU));
523			fwrite((char *)cout, sizeof(cout), 1, stdout);
524			return;
525			}
526	greg	1.1	(*putreal)(colval(r->rcol,RED));
527			(*putreal)(colval(r->rcol,GRN));
528			(*putreal)(colval(r->rcol,BLU));
529			}
530
531
532	greg	2.27	static void
533	schorsch	2.37	oputl( /* print effective distance */
534			RAY *r
535			)
536	greg	1.1	{
537	greg	1.9	(*putreal)(r->rt);
538	greg	2.5	}
539
540
541	greg	2.27	static void
542	schorsch	2.37	oputL( /* print single ray length */
543			RAY *r
544			)
545	greg	2.5	{
546			(*putreal)(r->rot);
547	greg	1.1	}
548
549
550	greg	2.27	static void
551	schorsch	2.37	oputc( /* print local coordinates */
552			RAY *r
553			)
554	greg	2.29	{
555			(*putreal)(r->uv[0]);
556			(*putreal)(r->uv[1]);
557			}
558
559
560			static void
561	schorsch	2.37	oputp( /* print point */
562			RAY *r
563			)
564	greg	1.1	{
565			if (r->rot < FHUGE) {
566			(*putreal)(r->rop[0]);
567			(*putreal)(r->rop[1]);
568			(*putreal)(r->rop[2]);
569			} else {
570			(*putreal)(0.0);
571			(*putreal)(0.0);
572			(*putreal)(0.0);
573			}
574			}
575
576
577	greg	2.27	static void
578	schorsch	2.37	oputN( /* print unperturbed normal */
579			RAY *r
580			)
581	greg	1.1	{
582			if (r->rot < FHUGE) {
583			(*putreal)(r->ron[0]);
584			(*putreal)(r->ron[1]);
585			(*putreal)(r->ron[2]);
586			} else {
587			(*putreal)(0.0);
588			(*putreal)(0.0);
589			(*putreal)(0.0);
590			}
591	greg	2.9	}
592
593
594	greg	2.27	static void
595	schorsch	2.37	oputn( /* print perturbed normal */
596			RAY *r
597			)
598	greg	2.9	{
599			FVECT pnorm;
600
601			if (r->rot >= FHUGE) {
602			(*putreal)(0.0);
603			(*putreal)(0.0);
604			(*putreal)(0.0);
605			return;
606			}
607			raynormal(pnorm, r);
608			(*putreal)(pnorm[0]);
609			(*putreal)(pnorm[1]);
610			(*putreal)(pnorm[2]);
611	greg	1.1	}
612
613
614	greg	2.27	static void
615	schorsch	2.37	oputs( /* print name */
616			RAY *r
617			)
618	greg	1.1	{
619			if (r->ro != NULL)
620			fputs(r->ro->oname, stdout);
621			else
622			putchar('*');
623			putchar('\t');
624			}
625
626
627	greg	2.27	static void
628	schorsch	2.37	oputw( /* print weight */
629			RAY *r
630			)
631	greg	1.1	{
632			(*putreal)(r->rweight);
633			}
634
635
636	greg	2.27	static void
637	greg	2.40	oputW( /* print contribution */
638			RAY *r
639			)
640			{
641			COLOR contr;
642
643			raycontrib(contr, r, PRIMARY);
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	greg	2.42	oputtilde( /* output tilde (spacer) */
686	greg	2.41	RAY *r
687			)
688			{
689	greg	2.42	fputs("~\t", stdout);
690	greg	2.41	}
691
692
693			static void
694	schorsch	2.37	puta( /* print ascii value */
695			double v
696			)
697	greg	1.1	{
698			printf("%e\t", v);
699			}
700
701
702	greg	2.27	static void
703	greg	1.1	putd(v) /* print binary double */
704			double v;
705			{
706	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
707	greg	1.1	}
708
709
710	greg	2.27	static void
711	greg	1.1	putf(v) /* print binary float */
712			double v;
713			{
714			float f = v;
715
716	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
717	greg	1.1	}