src/rt/rtrace.c

/* Copyright (c) 1986 Regents of the University of California */

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

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 */

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 = 1;                   /* number of source relays */
int  vspretest = 512;                   /* virtual source pretest density */
int  directinvis = 0;                   /* sources invisible? */
double  srcsizerat = .25;               /* maximum ratio source size/dist. */

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

int  maxdepth = 6;                      /* maximum recursion depth */
double  minweight = 4e-3;               /* minimum ray weight */

COLOR  ambval = BLKCOLOR;               /* ambient value */
double  ambacc = 0.2;                   /* ambient accuracy */
int  ambres = 32;                       /* ambient resolution */
int  ambdiv = 128;                      /* 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(), oputs(), oputw(), oputm();

static int  (*ray_out[10])(), (*every_out[10])();
static int  castonly;

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

static int  (*putreal)();


quit(code)                      /* quit program */
int  code;
{
        exit(code);
}


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);
        }
                                        /* set up output */
        setoutput(outvals);
        switch (outform) {
        case 'a': putreal = puta; break;
        case 'f': putreal = putf; break;
        case 'd': putreal = putd; break;
        }
                                        /* process file */
        while (getvec(orig, inform, fp) == 0 &&
                        getvec(direc, inform, fp) == 0) {

                if (normalize(direc) == 0.0) {          /* zero ==> flush */
                        fflush(stdout);
                        continue;
                }
                samplendx++;
                                                        /* compute and print */
                if (imm_irrad)
                        irrad(orig, direc);
                else
                        traceray(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;
        }
        if (vcount > 0)
                error(USER, "read error");
        fclose(fp);
}


setoutput(vs)                           /* set up output tables */
register char  *vs;
{
        extern int  ourtrace(), (*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':                               /* normal */
                        *table++ = oputn;
                        break;
                case 's':                               /* surface */
                        *table++ = oputs;
                        break;
                case 'w':                               /* weight */
                        *table++ = oputw;
                        break;
                case 'm':                               /* modifier */
                        *table++ = oputm;
                        break;
                }
        *table = NULL;
}


traceray(org, dir)              /* compute and print ray value(s) */
FVECT  org, dir;
{
        register int  (**tp)();

        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        if (castonly)
                localhit(&thisray, &thescene) || sourcehit(&thisray);
        else
                rayvalue(&thisray);

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


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;
        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);
        oputv(&thisray);
        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;
        }
        return(0);
}


static
ourtrace(r)                             /* print ray values */
RAY  *r;
{
        register int  (**tp)();

        if (every_out[0] == NULL)
                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;
{
        (*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 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
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)
                fputs(objptr(r->ro->omod)->oname, 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:	2.5
Committed:	Thu Mar 12 09:46:19 1992 UTC (32 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+17 -4 lines
Log Message:	added -oL output option for single-ray length
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#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	1.14	int dimlist[MAXDIM]; /* sampling dimensions */
34			int ndims = 0; /* number of sampling dimensions */
35			int samplendx = 0; /* index for this sample */
36
37	greg	1.13	int imm_irrad = 0; /* compute immediate irradiance? */
38
39	greg	1.1	int inform = 'a'; /* input format */
40			int outform = 'a'; /* output format */
41			char outvals = "v"; / output specification */
42
43			int hresolu = 0; /* horizontal (scan) size */
44			int vresolu = 0; /* vertical resolution */
45
46			double dstrsrc = 0.0; /* square source distribution */
47	greg	1.4	double shadthresh = .05; /* shadow threshold */
48	greg	1.5	double shadcert = .5; /* shadow certainty */
49	greg	1.20	int directrelay = 1; /* number of source relays */
50	greg	1.17	int vspretest = 512; /* virtual source pretest density */
51	greg	1.18	int directinvis = 0; /* sources invisible? */
52	greg	1.20	double srcsizerat = .25; /* maximum ratio source size/dist. */
53	greg	1.1
54	greg	2.4	double specthresh = .15; /* specular sampling threshold */
55	greg	2.3	double specjitter = 1.; /* specular sampling jitter */
56
57	greg	1.1	int maxdepth = 6; /* maximum recursion depth */
58			double minweight = 4e-3; /* minimum ray weight */
59
60			COLOR ambval = BLKCOLOR; /* ambient value */
61			double ambacc = 0.2; /* ambient accuracy */
62	greg	1.6	int ambres = 32; /* ambient resolution */
63	greg	1.1	int ambdiv = 128; /* ambient divisions */
64			int ambssamp = 0; /* ambient super-samples */
65			int ambounce = 0; /* ambient bounces */
66			char amblist[128]; / ambient include/exclude list */
67			int ambincl = -1; /* include == 1, exclude == 0 */
68
69	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
70
71	greg	1.1	static RAY thisray; /* for our convenience */
72
73	greg	2.5	static int oputo(), oputd(), oputv(), oputl(), oputL(),
74	greg	1.1	oputp(), oputn(), oputs(), oputw(), oputm();
75
76			static int (ray_out[10])(), (every_out[10])();
77	greg	1.11	static int castonly;
78	greg	1.1
79	greg	1.10	static int puta(), putf(), putd();
80	greg	1.1
81			static int (*putreal)();
82
83
84			quit(code) /* quit program */
85			int code;
86			{
87			exit(code);
88			}
89
90
91			rtrace(fname) /* trace rays from file */
92			char *fname;
93			{
94			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
95			long nextflush = hresolu;
96			FILE *fp;
97	greg	1.2	FVECT orig, direc;
98	greg	1.1	/* set up input */
99			if (fname == NULL)
100			fp = stdin;
101			else if ((fp = fopen(fname, "r")) == NULL) {
102			sprintf(errmsg, "cannot open input file \"%s\"", fname);
103			error(SYSTEM, errmsg);
104			}
105			/* set up output */
106			setoutput(outvals);
107			switch (outform) {
108			case 'a': putreal = puta; break;
109			case 'f': putreal = putf; break;
110			case 'd': putreal = putd; break;
111			}
112			/* process file */
113			while (getvec(orig, inform, fp) == 0 &&
114			getvec(direc, inform, fp) == 0) {
115
116	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
117			fflush(stdout);
118			continue;
119			}
120	greg	1.14	samplendx++;
121	greg	1.1	/* compute and print */
122	greg	1.13	if (imm_irrad)
123	greg	1.1	irrad(orig, direc);
124			else
125	greg	1.13	traceray(orig, direc);
126	greg	1.7	/* flush if time */
127	greg	1.1	if (--nextflush == 0) {
128			fflush(stdout);
129			nextflush = hresolu;
130			}
131			if (ferror(stdout))
132			error(SYSTEM, "write error");
133			if (--vcount == 0) /* check for end */
134			break;
135			}
136			if (vcount > 0)
137			error(USER, "read error");
138			fclose(fp);
139			}
140
141
142			setoutput(vs) /* set up output tables */
143			register char *vs;
144			{
145			extern int ourtrace(), (*trace)();
146			register int (**table)() = ray_out;
147
148	greg	1.11	castonly = 1;
149	greg	1.1	while (*vs)
150			switch (*vs++) {
151			case 't': /* trace */
152			*table = NULL;
153			table = every_out;
154			trace = ourtrace;
155	greg	1.11	castonly = 0;
156	greg	1.1	break;
157			case 'o': /* origin */
158			*table++ = oputo;
159			break;
160			case 'd': /* direction */
161			*table++ = oputd;
162			break;
163			case 'v': /* value */
164			*table++ = oputv;
165	greg	1.11	castonly = 0;
166	greg	1.1	break;
167	greg	2.5	case 'l': /* effective distance */
168	greg	1.1	*table++ = oputl;
169	greg	1.11	castonly = 0;
170	greg	1.1	break;
171	greg	2.5	case 'L': /* single ray length */
172			*table++ = oputL;
173			break;
174	greg	1.1	case 'p': /* point */
175			*table++ = oputp;
176			break;
177			case 'n': /* normal */
178			*table++ = oputn;
179			break;
180			case 's': /* surface */
181			*table++ = oputs;
182			break;
183			case 'w': /* weight */
184			*table++ = oputw;
185			break;
186			case 'm': /* modifier */
187			*table++ = oputm;
188			break;
189			}
190			*table = NULL;
191			}
192
193
194	greg	1.13	traceray(org, dir) /* compute and print ray value(s) */
195	greg	1.1	FVECT org, dir;
196			{
197			register int (**tp)();
198
199			VCOPY(thisray.rorg, org);
200			VCOPY(thisray.rdir, dir);
201			rayorigin(&thisray, NULL, PRIMARY, 1.0);
202	greg	1.11	if (castonly)
203			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
204			else
205			rayvalue(&thisray);
206	greg	1.1
207			if (ray_out[0] == NULL)
208			return;
209			for (tp = ray_out; *tp != NULL; tp++)
210			(**tp)(&thisray);
211			if (outform == 'a')
212			putchar('\n');
213			}
214
215
216	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
217	greg	1.1	FVECT org, dir;
218			{
219			register int i;
220
221			for (i = 0; i < 3; i++) {
222			thisray.rorg[i] = org[i] + dir[i];
223			thisray.rdir[i] = -dir[i];
224			}
225			rayorigin(&thisray, NULL, PRIMARY, 1.0);
226			/* pretend we hit surface */
227			thisray.rot = 1.0;
228			thisray.rod = 1.0;
229			VCOPY(thisray.ron, dir);
230			for (i = 0; i < 3; i++) /* fudge factor */
231			thisray.rop[i] = org[i] + 1e-4*dir[i];
232			/* compute and print */
233			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
234			oputv(&thisray);
235			if (outform == 'a')
236			putchar('\n');
237			}
238
239
240			getvec(vec, fmt, fp) /* get a vector from fp */
241			register FVECT vec;
242			int fmt;
243			FILE *fp;
244			{
245	greg	1.19	extern char *fgetword();
246	greg	1.1	static float vf[3];
247	greg	2.5	static double vd[3];
248	greg	1.19	char buf[32];
249			register int i;
250	greg	1.1
251			switch (fmt) {
252			case 'a': /* ascii */
253	greg	1.19	for (i = 0; i < 3; i++) {
254			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
255			!isflt(buf))
256			return(-1);
257			vec[i] = atof(buf);
258			}
259	greg	1.1	break;
260			case 'f': /* binary float */
261	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
262	greg	1.1	return(-1);
263			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
264			break;
265			case 'd': /* binary double */
266	greg	2.5	if (fread((char *)vd, sizeof(double), 3, fp) != 3)
267	greg	1.1	return(-1);
268	greg	2.5	vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2];
269	greg	1.1	break;
270			}
271			return(0);
272			}
273
274
275			static
276			ourtrace(r) /* print ray values */
277			RAY *r;
278			{
279			register int (**tp)();
280
281			if (every_out[0] == NULL)
282			return;
283			tabin(r);
284			for (tp = every_out; *tp != NULL; tp++)
285			(**tp)(r);
286			putchar('\n');
287			}
288
289
290			static
291			tabin(r) /* tab in appropriate amount */
292			RAY *r;
293			{
294			register RAY *rp;
295
296			for (rp = r->parent; rp != NULL; rp = rp->parent)
297			putchar('\t');
298			}
299
300
301			static
302			oputo(r) /* print origin */
303			register RAY *r;
304			{
305			(*putreal)(r->rorg[0]);
306			(*putreal)(r->rorg[1]);
307			(*putreal)(r->rorg[2]);
308			}
309
310
311			static
312			oputd(r) /* print direction */
313			register RAY *r;
314			{
315			(*putreal)(r->rdir[0]);
316			(*putreal)(r->rdir[1]);
317			(*putreal)(r->rdir[2]);
318			}
319
320
321			static
322			oputv(r) /* print value */
323			register RAY *r;
324			{
325			(*putreal)(colval(r->rcol,RED));
326			(*putreal)(colval(r->rcol,GRN));
327			(*putreal)(colval(r->rcol,BLU));
328			}
329
330
331			static
332	greg	2.5	oputl(r) /* print effective distance */
333	greg	1.1	register RAY *r;
334			{
335	greg	1.9	(*putreal)(r->rt);
336	greg	2.5	}
337
338
339			static
340			oputL(r) /* print single ray length */
341			register RAY *r;
342			{
343			(*putreal)(r->rot);
344	greg	1.1	}
345
346
347			static
348			oputp(r) /* print point */
349			register RAY *r;
350			{
351			if (r->rot < FHUGE) {
352			(*putreal)(r->rop[0]);
353			(*putreal)(r->rop[1]);
354			(*putreal)(r->rop[2]);
355			} else {
356			(*putreal)(0.0);
357			(*putreal)(0.0);
358			(*putreal)(0.0);
359			}
360			}
361
362
363			static
364			oputn(r) /* print normal */
365			register RAY *r;
366			{
367			if (r->rot < FHUGE) {
368			(*putreal)(r->ron[0]);
369			(*putreal)(r->ron[1]);
370			(*putreal)(r->ron[2]);
371			} else {
372			(*putreal)(0.0);
373			(*putreal)(0.0);
374			(*putreal)(0.0);
375			}
376			}
377
378
379			static
380			oputs(r) /* print name */
381			register RAY *r;
382			{
383			if (r->ro != NULL)
384			fputs(r->ro->oname, stdout);
385			else
386			putchar('*');
387			putchar('\t');
388			}
389
390
391			static
392			oputw(r) /* print weight */
393			register RAY *r;
394			{
395			(*putreal)(r->rweight);
396			}
397
398
399			static
400			oputm(r) /* print modifier */
401			register RAY *r;
402			{
403			if (r->ro != NULL)
404			fputs(objptr(r->ro->omod)->oname, stdout);
405			else
406			putchar('*');
407			putchar('\t');
408			}
409
410
411			static
412			puta(v) /* print ascii value */
413			double v;
414			{
415			printf("%e\t", v);
416			}
417
418
419			static
420			putd(v) /* print binary double */
421			double v;
422			{
423	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
424	greg	1.1	}
425
426
427			static
428			putf(v) /* print binary float */
429			double v;
430			{
431			float f = v;
432
433	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
434	greg	1.1	}