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 '-oi' or '-oI' options indicate that
 *  irradiance values are desired.
 */

#include  "ray.h"

#include  "octree.h"

#include  "otypes.h"

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  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 */

static RAY  thisray;                    /* for our convenience */

static int  oputo(), oputd(), oputv(), 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)();

static double  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
static OBJREC  Lamb = {
        OVOID, MAT_PLASTIC, "Lambertian",
        {0, 5, NULL, Lambfa}, NULL, -1,
};                                      /* a Lambertian surface */


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;
                }
                                                        /* compute and print */
                if (outvals[0] == 'i')
                        irrad(orig, direc);
                else if (outvals[0] == 'I')
                        Irrad(orig, direc);
                else
                        radiance(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':                               /* length */
                        *table++ = oputl;
                        castonly = 0;
                        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;
}


radiance(org, dir)              /* compute radiance value */
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 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');
}


Irrad(org, dir)         /* compute irradiance value after intersection */
FVECT  org, dir;
{
                                        /* compute intersection */
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        localhit(&thisray, &thescene);
        if (thisray.ro != NULL)         /* pretend we hit Lambertian surf. */
                (*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;
{
        static float  vf[3];

        switch (fmt) {
        case 'a':                                       /* ascii */
                if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
                        return(-1);
                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 *)vec, sizeof(double), 3, fp) != 3)
                        return(-1);
                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 length */
register RAY  *r;
{
        (*putreal)(r->rt);
}


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:	1.12
Committed:	Thu Mar 28 10:16:35 1991 UTC (33 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.11:	+25 -6 lines
Log Message:	added -oI option for irradiance after intersection
#	Content
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	* If the direction vector is (0,0,0), then the output is flushed.
20	* 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	* radiance is computed. The '-oi' or '-oI' options indicate that
24	* irradiance values are desired.
25	*/
26
27	#include "ray.h"
28
29	#include "octree.h"
30
31	#include "otypes.h"
32
33	int inform = 'a'; /* input format */
34	int outform = 'a'; /* output format */
35	char outvals = "v"; / output specification */
36
37	int hresolu = 0; /* horizontal (scan) size */
38	int vresolu = 0; /* vertical resolution */
39
40	double dstrsrc = 0.0; /* square source distribution */
41	double shadthresh = .05; /* shadow threshold */
42	double shadcert = .5; /* shadow certainty */
43
44	int maxdepth = 6; /* maximum recursion depth */
45	double minweight = 4e-3; /* minimum ray weight */
46
47	COLOR ambval = BLKCOLOR; /* ambient value */
48	double ambacc = 0.2; /* ambient accuracy */
49	int ambres = 32; /* ambient resolution */
50	int ambdiv = 128; /* ambient divisions */
51	int ambssamp = 0; /* ambient super-samples */
52	int ambounce = 0; /* ambient bounces */
53	char amblist[128]; / ambient include/exclude list */
54	int ambincl = -1; /* include == 1, exclude == 0 */
55
56	static RAY thisray; /* for our convenience */
57
58	static int oputo(), oputd(), oputv(), oputl(),
59	oputp(), oputn(), oputs(), oputw(), oputm();
60
61	static int (ray_out[10])(), (every_out[10])();
62	static int castonly;
63
64	static int puta(), putf(), putd();
65
66	static int (*putreal)();
67
68	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
69	static OBJREC Lamb = {
70	OVOID, MAT_PLASTIC, "Lambertian",
71	{0, 5, NULL, Lambfa}, NULL, -1,
72	}; /* a Lambertian surface */
73
74
75	quit(code) /* quit program */
76	int code;
77	{
78	exit(code);
79	}
80
81
82	rtrace(fname) /* trace rays from file */
83	char *fname;
84	{
85	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
86	long nextflush = hresolu;
87	FILE *fp;
88	FVECT orig, direc;
89	/* set up input */
90	if (fname == NULL)
91	fp = stdin;
92	else if ((fp = fopen(fname, "r")) == NULL) {
93	sprintf(errmsg, "cannot open input file \"%s\"", fname);
94	error(SYSTEM, errmsg);
95	}
96	/* set up output */
97	setoutput(outvals);
98	switch (outform) {
99	case 'a': putreal = puta; break;
100	case 'f': putreal = putf; break;
101	case 'd': putreal = putd; break;
102	}
103	/* process file */
104	while (getvec(orig, inform, fp) == 0 &&
105	getvec(direc, inform, fp) == 0) {
106
107	if (normalize(direc) == 0.0) { /* zero ==> flush */
108	fflush(stdout);
109	continue;
110	}
111	/* compute and print */
112	if (outvals[0] == 'i')
113	irrad(orig, direc);
114	else if (outvals[0] == 'I')
115	Irrad(orig, direc);
116	else
117	radiance(orig, direc);
118	/* flush if time */
119	if (--nextflush == 0) {
120	fflush(stdout);
121	nextflush = hresolu;
122	}
123	if (ferror(stdout))
124	error(SYSTEM, "write error");
125	if (--vcount == 0) /* check for end */
126	break;
127	}
128	if (vcount > 0)
129	error(USER, "read error");
130	fclose(fp);
131	}
132
133
134	setoutput(vs) /* set up output tables */
135	register char *vs;
136	{
137	extern int ourtrace(), (*trace)();
138	register int (**table)() = ray_out;
139
140	castonly = 1;
141	while (*vs)
142	switch (*vs++) {
143	case 't': /* trace */
144	*table = NULL;
145	table = every_out;
146	trace = ourtrace;
147	castonly = 0;
148	break;
149	case 'o': /* origin */
150	*table++ = oputo;
151	break;
152	case 'd': /* direction */
153	*table++ = oputd;
154	break;
155	case 'v': /* value */
156	*table++ = oputv;
157	castonly = 0;
158	break;
159	case 'l': /* length */
160	*table++ = oputl;
161	castonly = 0;
162	break;
163	case 'p': /* point */
164	*table++ = oputp;
165	break;
166	case 'n': /* normal */
167	*table++ = oputn;
168	break;
169	case 's': /* surface */
170	*table++ = oputs;
171	break;
172	case 'w': /* weight */
173	*table++ = oputw;
174	break;
175	case 'm': /* modifier */
176	*table++ = oputm;
177	break;
178	}
179	*table = NULL;
180	}
181
182
183	radiance(org, dir) /* compute radiance value */
184	FVECT org, dir;
185	{
186	register int (**tp)();
187
188	VCOPY(thisray.rorg, org);
189	VCOPY(thisray.rdir, dir);
190	rayorigin(&thisray, NULL, PRIMARY, 1.0);
191	if (castonly)
192	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
193	else
194	rayvalue(&thisray);
195
196	if (ray_out[0] == NULL)
197	return;
198	for (tp = ray_out; *tp != NULL; tp++)
199	(**tp)(&thisray);
200	if (outform == 'a')
201	putchar('\n');
202	}
203
204
205	irrad(org, dir) /* compute irradiance value */
206	FVECT org, dir;
207	{
208	register int i;
209
210	for (i = 0; i < 3; i++) {
211	thisray.rorg[i] = org[i] + dir[i];
212	thisray.rdir[i] = -dir[i];
213	}
214	rayorigin(&thisray, NULL, PRIMARY, 1.0);
215	/* pretend we hit surface */
216	thisray.rot = 1.0;
217	thisray.rod = 1.0;
218	VCOPY(thisray.ron, dir);
219	for (i = 0; i < 3; i++) /* fudge factor */
220	thisray.rop[i] = org[i] + 1e-4*dir[i];
221	/* compute and print */
222	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
223	oputv(&thisray);
224	if (outform == 'a')
225	putchar('\n');
226	}
227
228
229	Irrad(org, dir) /* compute irradiance value after intersection */
230	FVECT org, dir;
231	{
232	/* compute intersection */
233	VCOPY(thisray.rorg, org);
234	VCOPY(thisray.rdir, dir);
235	rayorigin(&thisray, NULL, PRIMARY, 1.0);
236	localhit(&thisray, &thescene);
237	if (thisray.ro != NULL) /* pretend we hit Lambertian surf. */
238	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
239	oputv(&thisray);
240	if (outform == 'a')
241	putchar('\n');
242	}
243
244
245	getvec(vec, fmt, fp) /* get a vector from fp */
246	register FVECT vec;
247	int fmt;
248	FILE *fp;
249	{
250	static float vf[3];
251
252	switch (fmt) {
253	case 'a': /* ascii */
254	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
255	return(-1);
256	break;
257	case 'f': /* binary float */
258	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
259	return(-1);
260	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
261	break;
262	case 'd': /* binary double */
263	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
264	return(-1);
265	break;
266	}
267	return(0);
268	}
269
270
271	static
272	ourtrace(r) /* print ray values */
273	RAY *r;
274	{
275	register int (**tp)();
276
277	if (every_out[0] == NULL)
278	return;
279	tabin(r);
280	for (tp = every_out; *tp != NULL; tp++)
281	(**tp)(r);
282	putchar('\n');
283	}
284
285
286	static
287	tabin(r) /* tab in appropriate amount */
288	RAY *r;
289	{
290	register RAY *rp;
291
292	for (rp = r->parent; rp != NULL; rp = rp->parent)
293	putchar('\t');
294	}
295
296
297	static
298	oputo(r) /* print origin */
299	register RAY *r;
300	{
301	(*putreal)(r->rorg[0]);
302	(*putreal)(r->rorg[1]);
303	(*putreal)(r->rorg[2]);
304	}
305
306
307	static
308	oputd(r) /* print direction */
309	register RAY *r;
310	{
311	(*putreal)(r->rdir[0]);
312	(*putreal)(r->rdir[1]);
313	(*putreal)(r->rdir[2]);
314	}
315
316
317	static
318	oputv(r) /* print value */
319	register RAY *r;
320	{
321	(*putreal)(colval(r->rcol,RED));
322	(*putreal)(colval(r->rcol,GRN));
323	(*putreal)(colval(r->rcol,BLU));
324	}
325
326
327	static
328	oputl(r) /* print length */
329	register RAY *r;
330	{
331	(*putreal)(r->rt);
332	}
333
334
335	static
336	oputp(r) /* print point */
337	register RAY *r;
338	{
339	if (r->rot < FHUGE) {
340	(*putreal)(r->rop[0]);
341	(*putreal)(r->rop[1]);
342	(*putreal)(r->rop[2]);
343	} else {
344	(*putreal)(0.0);
345	(*putreal)(0.0);
346	(*putreal)(0.0);
347	}
348	}
349
350
351	static
352	oputn(r) /* print normal */
353	register RAY *r;
354	{
355	if (r->rot < FHUGE) {
356	(*putreal)(r->ron[0]);
357	(*putreal)(r->ron[1]);
358	(*putreal)(r->ron[2]);
359	} else {
360	(*putreal)(0.0);
361	(*putreal)(0.0);
362	(*putreal)(0.0);
363	}
364	}
365
366
367	static
368	oputs(r) /* print name */
369	register RAY *r;
370	{
371	if (r->ro != NULL)
372	fputs(r->ro->oname, stdout);
373	else
374	putchar('*');
375	putchar('\t');
376	}
377
378
379	static
380	oputw(r) /* print weight */
381	register RAY *r;
382	{
383	(*putreal)(r->rweight);
384	}
385
386
387	static
388	oputm(r) /* print modifier */
389	register RAY *r;
390	{
391	if (r->ro != NULL)
392	fputs(objptr(r->ro->omod)->oname, stdout);
393	else
394	putchar('*');
395	putchar('\t');
396	}
397
398
399	static
400	puta(v) /* print ascii value */
401	double v;
402	{
403	printf("%e\t", v);
404	}
405
406
407	static
408	putd(v) /* print binary double */
409	double v;
410	{
411	fwrite((char *)&v, sizeof(v), 1, stdout);
412	}
413
414
415	static
416	putf(v) /* print binary float */
417	double v;
418	{
419	float f = v;
420
421	fwrite((char *)&f, sizeof(f), 1, stdout);
422	}