src/rt/rtrace.c

/* Copyright (c) 1997 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 *  rtrace.c - program and variables for individual ray tracing.
 *
 *     6/11/86
 */

/*
 *  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  "ray.h"

#include  "octree.h"

#include  "otypes.h"

#include  "resolu.h"

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 */

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 = .05;               /* shadow threshold */
double  shadcert = .5;                  /* 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 = 6;                      /* maximum recursion depth */
double  minweight = 4e-3;               /* minimum ray weight */

COLOR  ambval = BLKCOLOR;               /* ambient value */
int  ambvwt = 0;                        /* initial weight for ambient value */
double  ambacc = 0.2;                   /* ambient accuracy */
int  ambres = 128;                      /* ambient resolution */
int  ambdiv = 512;                      /* ambient divisions */
int  ambssamp = 0;                      /* ambient super-samples */
int  ambounce = 0;                      /* ambient bounces */
char  *amblist[128];                    /* ambient include/exclude list */
int  ambincl = -1;                      /* include == 1, exclude == 0 */

extern OBJREC  Lamb;                    /* a Lambertian surface */
extern OBJREC  Aftplane;                /* aft clipping object */


static RAY  thisray;                    /* for our convenience */

static int  oputo(), oputd(), oputv(), oputl(), oputL(),
                oputp(), oputn(), oputN(), oputs(), oputw(), oputm();

static int  ourtrace(), tabin();
static int  (*ray_out[16])(), (*every_out[16])();
static int  castonly = 0;

static int  puta(), putf(), putd();

static int  (*putreal)();


quit(code)                      /* quit program */
int  code;
{
#ifndef  NIX
        headclean();            /* delete header file */
        pfclean();              /* clean up persist files */
#endif
        exit(code);
}


char *
formstr(f)                              /* 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");
}


rtrace(fname)                           /* 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 MSDOS
        if (inform != 'a')
                setmode(fileno(fp), O_BINARY);
#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) {
                                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);
}


setoutput(vs)                           /* set up output tables */
register char  *vs;
{
        extern int  (*trace)();
        register int (**table)() = ray_out;

        castonly = 1;
        while (*vs)
                switch (*vs++) {
                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 '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 'm':                               /* modifier */
                        *table++ = oputm;
                        break;
                }
        *table = NULL;
}


bogusray()                      /* print out empty record */
{
        thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
        thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        printvals(&thisray);
}


rad(org, dir, dmax)             /* compute and print ray value(s) */
FVECT  org, dir;
double  dmax;
{
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        thisray.rmax = dmax;
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        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);
}


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

        for (i = 0; i < 3; i++) {
                thisray.rorg[i] = org[i] + dir[i];
                thisray.rdir[i] = -dir[i];
        }
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
                                        /* 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);
}


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

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


getvec(vec, fmt, fp)            /* get a vector from fp */
register FVECT  vec;
int  fmt;
FILE  *fp;
{
        extern char  *fgetword();
        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);
}


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

        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
ourtrace(r)                             /* print ray values */
RAY  *r;
{
        register int  (**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
tabin(r)                                /* tab in appropriate amount */
RAY  *r;
{
        register RAY  *rp;

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


static
oputo(r)                                /* print origin */
register RAY  *r;
{
        (*putreal)(r->rorg[0]);
        (*putreal)(r->rorg[1]);
        (*putreal)(r->rorg[2]);
}


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


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


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


static
oputp(r)                                /* print point */
register 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
oputN(r)                                /* print unperturbed normal */
register 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
oputn(r)                                /* 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
oputs(r)                                /* print name */
register RAY  *r;
{
        if (r->ro != NULL)
                fputs(r->ro->oname, stdout);
        else
                putchar('*');
        putchar('\t');
}


static
oputw(r)                                /* print weight */
register RAY  *r;
{
        (*putreal)(r->rweight);
}


static
oputm(r)                                /* print modifier */
register 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
puta(v)                         /* print ascii value */
double  v;
{
        printf("%e\t", v);
}


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


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

        fwrite((char *)&f, sizeof(f), 1, stdout);
}
Revision:	2.25
Committed:	Fri Oct 17 10:14:37 1997 UTC (26 years, 6 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 2.24:	+18 -7 lines
Log Message:	added -ld boolean option to rtrace for limiting ray distance
#	User	Rev	Content
1	gregl	2.24	/* Copyright (c) 1997 Silicon Graphics, Inc. */
2	greg	1.1
3			#ifndef lint
4	gregl	2.24	static char SCCSid[] = "$SunId$ SGI";
5	greg	1.1	#endif
6
7			/*
8			* rtrace.c - program and variables for individual ray tracing.
9			*
10			* 6/11/86
11			*/
12
13			/*
14			* Input is in the form:
15			*
16			* xorg yorg zorg xdir ydir zdir
17			*
18			* The direction need not be normalized. Output is flexible.
19	greg	1.7	* If the direction vector is (0,0,0), then the output is flushed.
20	greg	1.1	* All values default to ascii representation of real
21			* numbers. Binary representations can be selected
22			* with '-ff' for float or '-fd' for double. By default,
23	greg	1.13	* radiance is computed. The '-i' or '-I' options indicate that
24	greg	1.1	* irradiance values are desired.
25			*/
26
27			#include "ray.h"
28
29	greg	1.11	#include "octree.h"
30
31	greg	1.1	#include "otypes.h"
32
33	greg	2.6	#include "resolu.h"
34
35	greg	1.14	int dimlist[MAXDIM]; /* sampling dimensions */
36			int ndims = 0; /* number of sampling dimensions */
37			int samplendx = 0; /* index for this sample */
38
39	greg	1.13	int imm_irrad = 0; /* compute immediate irradiance? */
40	gregl	2.25	int lim_dist = 0; /* limit distance? */
41	greg	1.13
42	greg	1.1	int inform = 'a'; /* input format */
43			int outform = 'a'; /* output format */
44			char outvals = "v"; / output specification */
45
46	greg	2.15	char tralist[128]; / list of modifers to trace (or no) */
47			int traincl = -1; /* include == 1, exclude == 0 */
48			#define MAXTSET 511 /* maximum number in trace set */
49			OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */
50
51	greg	1.1	int hresolu = 0; /* horizontal (scan) size */
52			int vresolu = 0; /* vertical resolution */
53
54			double dstrsrc = 0.0; /* square source distribution */
55	greg	1.4	double shadthresh = .05; /* shadow threshold */
56	greg	1.5	double shadcert = .5; /* shadow certainty */
57	greg	2.19	int directrelay = 2; /* number of source relays */
58	greg	1.17	int vspretest = 512; /* virtual source pretest density */
59	greg	2.10	int directvis = 1; /* sources visible? */
60	greg	2.19	double srcsizerat = .2; /* maximum ratio source size/dist. */
61	greg	2.20
62			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
63	greg	2.22	COLOR salbedo = BLKCOLOR; /* global scattering albedo */
64	greg	2.20	double seccg = 0.; /* global scattering eccentricity */
65			double ssampdist = 0.; /* scatter sampling distance */
66	greg	1.1
67	greg	2.4	double specthresh = .15; /* specular sampling threshold */
68	greg	2.3	double specjitter = 1.; /* specular sampling jitter */
69
70	greg	2.18	int backvis = 1; /* back face visibility */
71
72	greg	1.1	int maxdepth = 6; /* maximum recursion depth */
73			double minweight = 4e-3; /* minimum ray weight */
74
75			COLOR ambval = BLKCOLOR; /* ambient value */
76	greg	2.21	int ambvwt = 0; /* initial weight for ambient value */
77	greg	1.1	double ambacc = 0.2; /* ambient accuracy */
78	greg	2.19	int ambres = 128; /* ambient resolution */
79			int ambdiv = 512; /* ambient divisions */
80	greg	1.1	int ambssamp = 0; /* ambient super-samples */
81			int ambounce = 0; /* ambient bounces */
82			char amblist[128]; / ambient include/exclude list */
83			int ambincl = -1; /* include == 1, exclude == 0 */
84
85	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
86	gregl	2.25	extern OBJREC Aftplane; /* aft clipping object */
87	greg	1.13
88	gregl	2.25
89	greg	1.1	static RAY thisray; /* for our convenience */
90
91	greg	2.5	static int oputo(), oputd(), oputv(), oputl(), oputL(),
92	greg	2.9	oputp(), oputn(), oputN(), oputs(), oputw(), oputm();
93	greg	1.1
94	greg	2.13	static int ourtrace(), tabin();
95	greg	2.14	static int (ray_out[16])(), (every_out[16])();
96			static int castonly = 0;
97	greg	1.1
98	greg	1.10	static int puta(), putf(), putd();
99	greg	1.1
100			static int (*putreal)();
101
102
103			quit(code) /* quit program */
104			int code;
105			{
106	greg	2.11	#ifndef NIX
107			headclean(); /* delete header file */
108			pfclean(); /* clean up persist files */
109			#endif
110	greg	1.1	exit(code);
111			}
112
113
114	greg	2.6	char *
115			formstr(f) /* return format identifier */
116			int f;
117			{
118			switch (f) {
119			case 'a': return("ascii");
120			case 'f': return("float");
121			case 'd': return("double");
122			case 'c': return(COLRFMT);
123			}
124			return("unknown");
125			}
126
127
128	greg	1.1	rtrace(fname) /* trace rays from file */
129			char *fname;
130			{
131			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
132			long nextflush = hresolu;
133			FILE *fp;
134	gregl	2.25	double d;
135	greg	1.2	FVECT orig, direc;
136	greg	1.1	/* set up input */
137			if (fname == NULL)
138			fp = stdin;
139			else if ((fp = fopen(fname, "r")) == NULL) {
140			sprintf(errmsg, "cannot open input file \"%s\"", fname);
141			error(SYSTEM, errmsg);
142			}
143	greg	2.8	#ifdef MSDOS
144			if (inform != 'a')
145			setmode(fileno(fp), O_BINARY);
146			#endif
147	greg	1.1	/* set up output */
148	greg	2.16	setoutput(outvals);
149	greg	1.1	switch (outform) {
150			case 'a': putreal = puta; break;
151			case 'f': putreal = putf; break;
152			case 'd': putreal = putd; break;
153	greg	2.6	case 'c':
154			if (strcmp(outvals, "v"))
155			error(USER, "color format with value output only");
156			break;
157			default:
158			error(CONSISTENCY, "botched output format");
159	greg	1.1	}
160	greg	2.12	if (hresolu > 0) {
161			if (vresolu > 0)
162			fprtresolu(hresolu, vresolu, stdout);
163			fflush(stdout);
164			}
165	greg	1.1	/* process file */
166			while (getvec(orig, inform, fp) == 0 &&
167			getvec(direc, inform, fp) == 0) {
168
169	gregl	2.25	d = normalize(direc);
170			if (d == 0.0) { /* zero ==> flush */
171	gregl	2.24	bogusray();
172			if (--nextflush <= 0) {
173			fflush(stdout);
174			nextflush = hresolu;
175			}
176			} else {
177			samplendx++;
178	greg	1.1	/* compute and print */
179	gregl	2.24	if (imm_irrad)
180			irrad(orig, direc);
181			else
182	gregl	2.25	rad(orig, direc, lim_dist ? d : 0.0);
183	greg	1.7	/* flush if time */
184	gregl	2.24	if (--nextflush == 0) {
185			fflush(stdout);
186			nextflush = hresolu;
187			}
188	greg	1.1	}
189			if (ferror(stdout))
190			error(SYSTEM, "write error");
191			if (--vcount == 0) /* check for end */
192			break;
193			}
194	greg	2.12	fflush(stdout);
195	greg	1.1	if (vcount > 0)
196			error(USER, "read error");
197	greg	2.12	if (fname != NULL)
198			fclose(fp);
199	greg	1.1	}
200
201
202			setoutput(vs) /* set up output tables */
203			register char *vs;
204			{
205	greg	2.13	extern int (*trace)();
206	greg	1.1	register int (**table)() = ray_out;
207
208	greg	1.11	castonly = 1;
209	greg	1.1	while (*vs)
210			switch (*vs++) {
211			case 't': /* trace */
212			*table = NULL;
213			table = every_out;
214			trace = ourtrace;
215	greg	1.11	castonly = 0;
216	greg	1.1	break;
217			case 'o': /* origin */
218			*table++ = oputo;
219			break;
220			case 'd': /* direction */
221			*table++ = oputd;
222			break;
223			case 'v': /* value */
224			*table++ = oputv;
225	greg	1.11	castonly = 0;
226	greg	1.1	break;
227	greg	2.5	case 'l': /* effective distance */
228	greg	1.1	*table++ = oputl;
229	greg	1.11	castonly = 0;
230	greg	1.1	break;
231	greg	2.5	case 'L': /* single ray length */
232			*table++ = oputL;
233			break;
234	greg	1.1	case 'p': /* point */
235			*table++ = oputp;
236			break;
237	greg	2.9	case 'n': /* perturbed normal */
238	greg	1.1	*table++ = oputn;
239	greg	2.9	castonly = 0;
240	greg	1.1	break;
241	greg	2.9	case 'N': /* unperturbed normal */
242			*table++ = oputN;
243			break;
244	greg	1.1	case 's': /* surface */
245			*table++ = oputs;
246			break;
247			case 'w': /* weight */
248			*table++ = oputw;
249			break;
250			case 'm': /* modifier */
251			*table++ = oputm;
252			break;
253			}
254			*table = NULL;
255	gregl	2.24	}
256
257
258			bogusray() /* print out empty record */
259			{
260			thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
261			thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
262			rayorigin(&thisray, NULL, PRIMARY, 1.0);
263			printvals(&thisray);
264	greg	1.1	}
265
266
267	gregl	2.25	rad(org, dir, dmax) /* compute and print ray value(s) */
268	greg	1.1	FVECT org, dir;
269	gregl	2.25	double dmax;
270	greg	1.1	{
271			VCOPY(thisray.rorg, org);
272			VCOPY(thisray.rdir, dir);
273	gregl	2.25	thisray.rmax = dmax;
274	greg	1.1	rayorigin(&thisray, NULL, PRIMARY, 1.0);
275	gregl	2.25	if (castonly) {
276			if (!localhit(&thisray, &thescene))
277			if (thisray.ro == &Aftplane) { /* clipped */
278			thisray.ro = NULL;
279			thisray.rot = FHUGE;
280			} else
281			sourcehit(&thisray);
282			} else
283	greg	1.11	rayvalue(&thisray);
284	greg	2.16	printvals(&thisray);
285	greg	1.1	}
286
287
288	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
289	greg	1.1	FVECT org, dir;
290			{
291			register int i;
292
293			for (i = 0; i < 3; i++) {
294			thisray.rorg[i] = org[i] + dir[i];
295			thisray.rdir[i] = -dir[i];
296			}
297			rayorigin(&thisray, NULL, PRIMARY, 1.0);
298			/* pretend we hit surface */
299	greg	2.16	thisray.rot = 1.0-1e-4;
300	greg	1.1	thisray.rod = 1.0;
301			VCOPY(thisray.ron, dir);
302			for (i = 0; i < 3; i++) /* fudge factor */
303			thisray.rop[i] = org[i] + 1e-4*dir[i];
304			/* compute and print */
305			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
306	greg	2.16	printvals(&thisray);
307			}
308
309
310			printvals(r) /* print requested ray values */
311			RAY *r;
312			{
313			register int (**tp)();
314
315			if (ray_out[0] == NULL)
316			return;
317			for (tp = ray_out; *tp != NULL; tp++)
318			(**tp)(r);
319	greg	1.1	if (outform == 'a')
320			putchar('\n');
321			}
322
323
324			getvec(vec, fmt, fp) /* get a vector from fp */
325			register FVECT vec;
326			int fmt;
327			FILE *fp;
328			{
329	greg	1.19	extern char *fgetword();
330	greg	1.1	static float vf[3];
331	greg	2.5	static double vd[3];
332	greg	1.19	char buf[32];
333			register int i;
334	greg	1.1
335			switch (fmt) {
336			case 'a': /* ascii */
337	greg	1.19	for (i = 0; i < 3; i++) {
338			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
339			!isflt(buf))
340			return(-1);
341			vec[i] = atof(buf);
342			}
343	greg	1.1	break;
344			case 'f': /* binary float */
345	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
346	greg	1.1	return(-1);
347			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
348			break;
349			case 'd': /* binary double */
350	greg	2.5	if (fread((char *)vd, sizeof(double), 3, fp) != 3)
351	greg	1.1	return(-1);
352	greg	2.5	vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
353	greg	1.1	break;
354	greg	2.6	default:
355			error(CONSISTENCY, "botched input format");
356	greg	1.1	}
357			return(0);
358			}
359
360
361	greg	2.15	tranotify(obj) /* record new modifier */
362			OBJECT obj;
363			{
364			static int hitlimit = 0;
365			register OBJREC *o = objptr(obj);
366			register char **tralp;
367
368			if (hitlimit \|\| !ismodifier(o->otype))
369			return;
370			for (tralp = tralist; *tralp != NULL; tralp++)
371			if (!strcmp(o->oname, *tralp)) {
372			if (traset[0] >= MAXTSET) {
373			error(WARNING, "too many modifiers in trace list");
374			hitlimit++;
375			return; /* should this be fatal? */
376			}
377			insertelem(traset, obj);
378			return;
379			}
380			}
381
382
383	greg	1.1	static
384			ourtrace(r) /* print ray values */
385			RAY *r;
386			{
387			register int (**tp)();
388
389			if (every_out[0] == NULL)
390	greg	2.15	return;
391	greg	2.16	if (r->ro == NULL) {
392			if (traincl == 1)
393			return;
394			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
395	greg	1.1	return;
396			tabin(r);
397			for (tp = every_out; *tp != NULL; tp++)
398			(**tp)(r);
399			putchar('\n');
400			}
401
402
403			static
404			tabin(r) /* tab in appropriate amount */
405			RAY *r;
406			{
407			register RAY *rp;
408
409			for (rp = r->parent; rp != NULL; rp = rp->parent)
410			putchar('\t');
411			}
412
413
414			static
415			oputo(r) /* print origin */
416			register RAY *r;
417			{
418			(*putreal)(r->rorg[0]);
419			(*putreal)(r->rorg[1]);
420			(*putreal)(r->rorg[2]);
421			}
422
423
424			static
425			oputd(r) /* print direction */
426			register RAY *r;
427			{
428			(*putreal)(r->rdir[0]);
429			(*putreal)(r->rdir[1]);
430			(*putreal)(r->rdir[2]);
431			}
432
433
434			static
435			oputv(r) /* print value */
436			register RAY *r;
437			{
438	greg	2.6	COLR cout;
439
440			if (outform == 'c') {
441			setcolr(cout, colval(r->rcol,RED),
442			colval(r->rcol,GRN),
443			colval(r->rcol,BLU));
444			fwrite((char *)cout, sizeof(cout), 1, stdout);
445			return;
446			}
447	greg	1.1	(*putreal)(colval(r->rcol,RED));
448			(*putreal)(colval(r->rcol,GRN));
449			(*putreal)(colval(r->rcol,BLU));
450			}
451
452
453			static
454	greg	2.5	oputl(r) /* print effective distance */
455	greg	1.1	register RAY *r;
456			{
457	greg	1.9	(*putreal)(r->rt);
458	greg	2.5	}
459
460
461			static
462			oputL(r) /* print single ray length */
463			register RAY *r;
464			{
465			(*putreal)(r->rot);
466	greg	1.1	}
467
468
469			static
470			oputp(r) /* print point */
471			register RAY *r;
472			{
473			if (r->rot < FHUGE) {
474			(*putreal)(r->rop[0]);
475			(*putreal)(r->rop[1]);
476			(*putreal)(r->rop[2]);
477			} else {
478			(*putreal)(0.0);
479			(*putreal)(0.0);
480			(*putreal)(0.0);
481			}
482			}
483
484
485			static
486	greg	2.9	oputN(r) /* print unperturbed normal */
487	greg	1.1	register RAY *r;
488			{
489			if (r->rot < FHUGE) {
490			(*putreal)(r->ron[0]);
491			(*putreal)(r->ron[1]);
492			(*putreal)(r->ron[2]);
493			} else {
494			(*putreal)(0.0);
495			(*putreal)(0.0);
496			(*putreal)(0.0);
497			}
498	greg	2.9	}
499
500
501			static
502			oputn(r) /* print perturbed normal */
503			RAY *r;
504			{
505			FVECT pnorm;
506
507			if (r->rot >= FHUGE) {
508			(*putreal)(0.0);
509			(*putreal)(0.0);
510			(*putreal)(0.0);
511			return;
512			}
513			raynormal(pnorm, r);
514			(*putreal)(pnorm[0]);
515			(*putreal)(pnorm[1]);
516			(*putreal)(pnorm[2]);
517	greg	1.1	}
518
519
520			static
521			oputs(r) /* print name */
522			register RAY *r;
523			{
524			if (r->ro != NULL)
525			fputs(r->ro->oname, stdout);
526			else
527			putchar('*');
528			putchar('\t');
529			}
530
531
532			static
533			oputw(r) /* print weight */
534			register RAY *r;
535			{
536			(*putreal)(r->rweight);
537			}
538
539
540			static
541			oputm(r) /* print modifier */
542			register RAY *r;
543			{
544			if (r->ro != NULL)
545	greg	2.23	if (r->ro->omod != OVOID)
546			fputs(objptr(r->ro->omod)->oname, stdout);
547			else
548			fputs(VOIDID, stdout);
549	greg	1.1	else
550			putchar('*');
551			putchar('\t');
552			}
553
554
555			static
556			puta(v) /* print ascii value */
557			double v;
558			{
559			printf("%e\t", v);
560			}
561
562
563			static
564			putd(v) /* print binary double */
565			double v;
566			{
567	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
568	greg	1.1	}
569
570
571			static
572			putf(v) /* print binary float */
573			double v;
574			{
575			float f = v;
576
577	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
578	greg	1.1	}