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  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 */

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;
        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) {

                if (normalize(direc) == 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);
                                                        /* 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)                   /* compute and print ray value(s) */
FVECT  org, dir;
{
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        thisray.rmax = 0.0;
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        if (castonly)
                localhit(&thisray, &thescene) || 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:	2.24
Committed:	Wed Jul 9 11:25:49 1997 UTC (26 years, 9 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 2.23:	+26 -13 lines
Log Message:	changed rtrace behavior to send bogus record when ray dir==0
#	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
41	greg	1.1	int inform = 'a'; /* input format */
42			int outform = 'a'; /* output format */
43			char outvals = "v"; / output specification */
44
45	greg	2.15	char tralist[128]; / list of modifers to trace (or no) */
46			int traincl = -1; /* include == 1, exclude == 0 */
47			#define MAXTSET 511 /* maximum number in trace set */
48			OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */
49
50	greg	1.1	int hresolu = 0; /* horizontal (scan) size */
51			int vresolu = 0; /* vertical resolution */
52
53			double dstrsrc = 0.0; /* square source distribution */
54	greg	1.4	double shadthresh = .05; /* shadow threshold */
55	greg	1.5	double shadcert = .5; /* shadow certainty */
56	greg	2.19	int directrelay = 2; /* number of source relays */
57	greg	1.17	int vspretest = 512; /* virtual source pretest density */
58	greg	2.10	int directvis = 1; /* sources visible? */
59	greg	2.19	double srcsizerat = .2; /* maximum ratio source size/dist. */
60	greg	2.20
61			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
62	greg	2.22	COLOR salbedo = BLKCOLOR; /* global scattering albedo */
63	greg	2.20	double seccg = 0.; /* global scattering eccentricity */
64			double ssampdist = 0.; /* scatter sampling distance */
65	greg	1.1
66	greg	2.4	double specthresh = .15; /* specular sampling threshold */
67	greg	2.3	double specjitter = 1.; /* specular sampling jitter */
68
69	greg	2.18	int backvis = 1; /* back face visibility */
70
71	greg	1.1	int maxdepth = 6; /* maximum recursion depth */
72			double minweight = 4e-3; /* minimum ray weight */
73
74			COLOR ambval = BLKCOLOR; /* ambient value */
75	greg	2.21	int ambvwt = 0; /* initial weight for ambient value */
76	greg	1.1	double ambacc = 0.2; /* ambient accuracy */
77	greg	2.19	int ambres = 128; /* ambient resolution */
78			int ambdiv = 512; /* ambient divisions */
79	greg	1.1	int ambssamp = 0; /* ambient super-samples */
80			int ambounce = 0; /* ambient bounces */
81			char amblist[128]; / ambient include/exclude list */
82			int ambincl = -1; /* include == 1, exclude == 0 */
83
84	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
85
86	greg	1.1	static RAY thisray; /* for our convenience */
87
88	greg	2.5	static int oputo(), oputd(), oputv(), oputl(), oputL(),
89	greg	2.9	oputp(), oputn(), oputN(), oputs(), oputw(), oputm();
90	greg	1.1
91	greg	2.13	static int ourtrace(), tabin();
92	greg	2.14	static int (ray_out[16])(), (every_out[16])();
93			static int castonly = 0;
94	greg	1.1
95	greg	1.10	static int puta(), putf(), putd();
96	greg	1.1
97			static int (*putreal)();
98
99
100			quit(code) /* quit program */
101			int code;
102			{
103	greg	2.11	#ifndef NIX
104			headclean(); /* delete header file */
105			pfclean(); /* clean up persist files */
106			#endif
107	greg	1.1	exit(code);
108			}
109
110
111	greg	2.6	char *
112			formstr(f) /* return format identifier */
113			int f;
114			{
115			switch (f) {
116			case 'a': return("ascii");
117			case 'f': return("float");
118			case 'd': return("double");
119			case 'c': return(COLRFMT);
120			}
121			return("unknown");
122			}
123
124
125	greg	1.1	rtrace(fname) /* trace rays from file */
126			char *fname;
127			{
128			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
129			long nextflush = hresolu;
130			FILE *fp;
131	greg	1.2	FVECT orig, direc;
132	greg	1.1	/* set up input */
133			if (fname == NULL)
134			fp = stdin;
135			else if ((fp = fopen(fname, "r")) == NULL) {
136			sprintf(errmsg, "cannot open input file \"%s\"", fname);
137			error(SYSTEM, errmsg);
138			}
139	greg	2.8	#ifdef MSDOS
140			if (inform != 'a')
141			setmode(fileno(fp), O_BINARY);
142			#endif
143	greg	1.1	/* set up output */
144	greg	2.16	setoutput(outvals);
145	greg	1.1	switch (outform) {
146			case 'a': putreal = puta; break;
147			case 'f': putreal = putf; break;
148			case 'd': putreal = putd; break;
149	greg	2.6	case 'c':
150			if (strcmp(outvals, "v"))
151			error(USER, "color format with value output only");
152			break;
153			default:
154			error(CONSISTENCY, "botched output format");
155	greg	1.1	}
156	greg	2.12	if (hresolu > 0) {
157			if (vresolu > 0)
158			fprtresolu(hresolu, vresolu, stdout);
159			fflush(stdout);
160			}
161	greg	1.1	/* process file */
162			while (getvec(orig, inform, fp) == 0 &&
163			getvec(direc, inform, fp) == 0) {
164
165	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
166	gregl	2.24	bogusray();
167			if (--nextflush <= 0) {
168			fflush(stdout);
169			nextflush = hresolu;
170			}
171			} else {
172			samplendx++;
173	greg	1.1	/* compute and print */
174	gregl	2.24	if (imm_irrad)
175			irrad(orig, direc);
176			else
177			rad(orig, direc);
178	greg	1.7	/* flush if time */
179	gregl	2.24	if (--nextflush == 0) {
180			fflush(stdout);
181			nextflush = hresolu;
182			}
183	greg	1.1	}
184			if (ferror(stdout))
185			error(SYSTEM, "write error");
186			if (--vcount == 0) /* check for end */
187			break;
188			}
189	greg	2.12	fflush(stdout);
190	greg	1.1	if (vcount > 0)
191			error(USER, "read error");
192	greg	2.12	if (fname != NULL)
193			fclose(fp);
194	greg	1.1	}
195
196
197			setoutput(vs) /* set up output tables */
198			register char *vs;
199			{
200	greg	2.13	extern int (*trace)();
201	greg	1.1	register int (**table)() = ray_out;
202
203	greg	1.11	castonly = 1;
204	greg	1.1	while (*vs)
205			switch (*vs++) {
206			case 't': /* trace */
207			*table = NULL;
208			table = every_out;
209			trace = ourtrace;
210	greg	1.11	castonly = 0;
211	greg	1.1	break;
212			case 'o': /* origin */
213			*table++ = oputo;
214			break;
215			case 'd': /* direction */
216			*table++ = oputd;
217			break;
218			case 'v': /* value */
219			*table++ = oputv;
220	greg	1.11	castonly = 0;
221	greg	1.1	break;
222	greg	2.5	case 'l': /* effective distance */
223	greg	1.1	*table++ = oputl;
224	greg	1.11	castonly = 0;
225	greg	1.1	break;
226	greg	2.5	case 'L': /* single ray length */
227			*table++ = oputL;
228			break;
229	greg	1.1	case 'p': /* point */
230			*table++ = oputp;
231			break;
232	greg	2.9	case 'n': /* perturbed normal */
233	greg	1.1	*table++ = oputn;
234	greg	2.9	castonly = 0;
235	greg	1.1	break;
236	greg	2.9	case 'N': /* unperturbed normal */
237			*table++ = oputN;
238			break;
239	greg	1.1	case 's': /* surface */
240			*table++ = oputs;
241			break;
242			case 'w': /* weight */
243			*table++ = oputw;
244			break;
245			case 'm': /* modifier */
246			*table++ = oputm;
247			break;
248			}
249			*table = NULL;
250	gregl	2.24	}
251
252
253			bogusray() /* print out empty record */
254			{
255			thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] =
256			thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0;
257			rayorigin(&thisray, NULL, PRIMARY, 1.0);
258			printvals(&thisray);
259	greg	1.1	}
260
261
262	greg	2.16	rad(org, dir) /* compute and print ray value(s) */
263	greg	1.1	FVECT org, dir;
264			{
265			VCOPY(thisray.rorg, org);
266			VCOPY(thisray.rdir, dir);
267	greg	2.17	thisray.rmax = 0.0;
268	greg	1.1	rayorigin(&thisray, NULL, PRIMARY, 1.0);
269	greg	1.11	if (castonly)
270			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
271			else
272			rayvalue(&thisray);
273	greg	2.16	printvals(&thisray);
274	greg	1.1	}
275
276
277	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
278	greg	1.1	FVECT org, dir;
279			{
280			register int i;
281
282			for (i = 0; i < 3; i++) {
283			thisray.rorg[i] = org[i] + dir[i];
284			thisray.rdir[i] = -dir[i];
285			}
286			rayorigin(&thisray, NULL, PRIMARY, 1.0);
287			/* pretend we hit surface */
288	greg	2.16	thisray.rot = 1.0-1e-4;
289	greg	1.1	thisray.rod = 1.0;
290			VCOPY(thisray.ron, dir);
291			for (i = 0; i < 3; i++) /* fudge factor */
292			thisray.rop[i] = org[i] + 1e-4*dir[i];
293			/* compute and print */
294			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
295	greg	2.16	printvals(&thisray);
296			}
297
298
299			printvals(r) /* print requested ray values */
300			RAY *r;
301			{
302			register int (**tp)();
303
304			if (ray_out[0] == NULL)
305			return;
306			for (tp = ray_out; *tp != NULL; tp++)
307			(**tp)(r);
308	greg	1.1	if (outform == 'a')
309			putchar('\n');
310			}
311
312
313			getvec(vec, fmt, fp) /* get a vector from fp */
314			register FVECT vec;
315			int fmt;
316			FILE *fp;
317			{
318	greg	1.19	extern char *fgetword();
319	greg	1.1	static float vf[3];
320	greg	2.5	static double vd[3];
321	greg	1.19	char buf[32];
322			register int i;
323	greg	1.1
324			switch (fmt) {
325			case 'a': /* ascii */
326	greg	1.19	for (i = 0; i < 3; i++) {
327			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
328			!isflt(buf))
329			return(-1);
330			vec[i] = atof(buf);
331			}
332	greg	1.1	break;
333			case 'f': /* binary float */
334	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
335	greg	1.1	return(-1);
336			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
337			break;
338			case 'd': /* binary double */
339	greg	2.5	if (fread((char *)vd, sizeof(double), 3, fp) != 3)
340	greg	1.1	return(-1);
341	greg	2.5	vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
342	greg	1.1	break;
343	greg	2.6	default:
344			error(CONSISTENCY, "botched input format");
345	greg	1.1	}
346			return(0);
347			}
348
349
350	greg	2.15	tranotify(obj) /* record new modifier */
351			OBJECT obj;
352			{
353			static int hitlimit = 0;
354			register OBJREC *o = objptr(obj);
355			register char **tralp;
356
357			if (hitlimit \|\| !ismodifier(o->otype))
358			return;
359			for (tralp = tralist; *tralp != NULL; tralp++)
360			if (!strcmp(o->oname, *tralp)) {
361			if (traset[0] >= MAXTSET) {
362			error(WARNING, "too many modifiers in trace list");
363			hitlimit++;
364			return; /* should this be fatal? */
365			}
366			insertelem(traset, obj);
367			return;
368			}
369			}
370
371
372	greg	1.1	static
373			ourtrace(r) /* print ray values */
374			RAY *r;
375			{
376			register int (**tp)();
377
378			if (every_out[0] == NULL)
379	greg	2.15	return;
380	greg	2.16	if (r->ro == NULL) {
381			if (traincl == 1)
382			return;
383			} else if (traincl != -1 && traincl != inset(traset, r->ro->omod))
384	greg	1.1	return;
385			tabin(r);
386			for (tp = every_out; *tp != NULL; tp++)
387			(**tp)(r);
388			putchar('\n');
389			}
390
391
392			static
393			tabin(r) /* tab in appropriate amount */
394			RAY *r;
395			{
396			register RAY *rp;
397
398			for (rp = r->parent; rp != NULL; rp = rp->parent)
399			putchar('\t');
400			}
401
402
403			static
404			oputo(r) /* print origin */
405			register RAY *r;
406			{
407			(*putreal)(r->rorg[0]);
408			(*putreal)(r->rorg[1]);
409			(*putreal)(r->rorg[2]);
410			}
411
412
413			static
414			oputd(r) /* print direction */
415			register RAY *r;
416			{
417			(*putreal)(r->rdir[0]);
418			(*putreal)(r->rdir[1]);
419			(*putreal)(r->rdir[2]);
420			}
421
422
423			static
424			oputv(r) /* print value */
425			register RAY *r;
426			{
427	greg	2.6	COLR cout;
428
429			if (outform == 'c') {
430			setcolr(cout, colval(r->rcol,RED),
431			colval(r->rcol,GRN),
432			colval(r->rcol,BLU));
433			fwrite((char *)cout, sizeof(cout), 1, stdout);
434			return;
435			}
436	greg	1.1	(*putreal)(colval(r->rcol,RED));
437			(*putreal)(colval(r->rcol,GRN));
438			(*putreal)(colval(r->rcol,BLU));
439			}
440
441
442			static
443	greg	2.5	oputl(r) /* print effective distance */
444	greg	1.1	register RAY *r;
445			{
446	greg	1.9	(*putreal)(r->rt);
447	greg	2.5	}
448
449
450			static
451			oputL(r) /* print single ray length */
452			register RAY *r;
453			{
454			(*putreal)(r->rot);
455	greg	1.1	}
456
457
458			static
459			oputp(r) /* print point */
460			register RAY *r;
461			{
462			if (r->rot < FHUGE) {
463			(*putreal)(r->rop[0]);
464			(*putreal)(r->rop[1]);
465			(*putreal)(r->rop[2]);
466			} else {
467			(*putreal)(0.0);
468			(*putreal)(0.0);
469			(*putreal)(0.0);
470			}
471			}
472
473
474			static
475	greg	2.9	oputN(r) /* print unperturbed normal */
476	greg	1.1	register RAY *r;
477			{
478			if (r->rot < FHUGE) {
479			(*putreal)(r->ron[0]);
480			(*putreal)(r->ron[1]);
481			(*putreal)(r->ron[2]);
482			} else {
483			(*putreal)(0.0);
484			(*putreal)(0.0);
485			(*putreal)(0.0);
486			}
487	greg	2.9	}
488
489
490			static
491			oputn(r) /* print perturbed normal */
492			RAY *r;
493			{
494			FVECT pnorm;
495
496			if (r->rot >= FHUGE) {
497			(*putreal)(0.0);
498			(*putreal)(0.0);
499			(*putreal)(0.0);
500			return;
501			}
502			raynormal(pnorm, r);
503			(*putreal)(pnorm[0]);
504			(*putreal)(pnorm[1]);
505			(*putreal)(pnorm[2]);
506	greg	1.1	}
507
508
509			static
510			oputs(r) /* print name */
511			register RAY *r;
512			{
513			if (r->ro != NULL)
514			fputs(r->ro->oname, stdout);
515			else
516			putchar('*');
517			putchar('\t');
518			}
519
520
521			static
522			oputw(r) /* print weight */
523			register RAY *r;
524			{
525			(*putreal)(r->rweight);
526			}
527
528
529			static
530			oputm(r) /* print modifier */
531			register RAY *r;
532			{
533			if (r->ro != NULL)
534	greg	2.23	if (r->ro->omod != OVOID)
535			fputs(objptr(r->ro->omod)->oname, stdout);
536			else
537			fputs(VOIDID, stdout);
538	greg	1.1	else
539			putchar('*');
540			putchar('\t');
541			}
542
543
544			static
545			puta(v) /* print ascii value */
546			double v;
547			{
548			printf("%e\t", v);
549			}
550
551
552			static
553			putd(v) /* print binary double */
554			double v;
555			{
556	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
557	greg	1.1	}
558
559
560			static
561			putf(v) /* print binary float */
562			double v;
563			{
564			float f = v;
565
566	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
567	greg	1.1	}