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(), 
                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':                               /* 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;
}


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];
        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 *)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:	2.4
Committed:	Thu Jan 16 12:05:20 1992 UTC (32 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.3:	+1 -1 lines
Log Message:	changed default values and handling of specthresh
#	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 '-i' or '-I' 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 dimlist[MAXDIM]; /* sampling dimensions */
34	int ndims = 0; /* number of sampling dimensions */
35	int samplendx = 0; /* index for this sample */
36
37	int imm_irrad = 0; /* compute immediate irradiance? */
38
39	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	double shadthresh = .05; /* shadow threshold */
48	double shadcert = .5; /* shadow certainty */
49	int directrelay = 1; /* number of source relays */
50	int vspretest = 512; /* virtual source pretest density */
51	int directinvis = 0; /* sources invisible? */
52	double srcsizerat = .25; /* maximum ratio source size/dist. */
53
54	double specthresh = .15; /* specular sampling threshold */
55	double specjitter = 1.; /* specular sampling jitter */
56
57	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	int ambres = 32; /* ambient resolution */
63	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	extern OBJREC Lamb; /* a Lambertian surface */
70
71	static RAY thisray; /* for our convenience */
72
73	static int oputo(), oputd(), oputv(), oputl(),
74	oputp(), oputn(), oputs(), oputw(), oputm();
75
76	static int (ray_out[10])(), (every_out[10])();
77	static int castonly;
78
79	static int puta(), putf(), putd();
80
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	FVECT orig, direc;
98	/* 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	if (normalize(direc) == 0.0) { /* zero ==> flush */
117	fflush(stdout);
118	continue;
119	}
120	samplendx++;
121	/* compute and print */
122	if (imm_irrad)
123	irrad(orig, direc);
124	else
125	traceray(orig, direc);
126	/* flush if time */
127	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	castonly = 1;
149	while (*vs)
150	switch (*vs++) {
151	case 't': /* trace */
152	*table = NULL;
153	table = every_out;
154	trace = ourtrace;
155	castonly = 0;
156	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	castonly = 0;
166	break;
167	case 'l': /* length */
168	*table++ = oputl;
169	castonly = 0;
170	break;
171	case 'p': /* point */
172	*table++ = oputp;
173	break;
174	case 'n': /* normal */
175	*table++ = oputn;
176	break;
177	case 's': /* surface */
178	*table++ = oputs;
179	break;
180	case 'w': /* weight */
181	*table++ = oputw;
182	break;
183	case 'm': /* modifier */
184	*table++ = oputm;
185	break;
186	}
187	*table = NULL;
188	}
189
190
191	traceray(org, dir) /* compute and print ray value(s) */
192	FVECT org, dir;
193	{
194	register int (**tp)();
195
196	VCOPY(thisray.rorg, org);
197	VCOPY(thisray.rdir, dir);
198	rayorigin(&thisray, NULL, PRIMARY, 1.0);
199	if (castonly)
200	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
201	else
202	rayvalue(&thisray);
203
204	if (ray_out[0] == NULL)
205	return;
206	for (tp = ray_out; *tp != NULL; tp++)
207	(**tp)(&thisray);
208	if (outform == 'a')
209	putchar('\n');
210	}
211
212
213	irrad(org, dir) /* compute immediate irradiance value */
214	FVECT org, dir;
215	{
216	register int i;
217
218	for (i = 0; i < 3; i++) {
219	thisray.rorg[i] = org[i] + dir[i];
220	thisray.rdir[i] = -dir[i];
221	}
222	rayorigin(&thisray, NULL, PRIMARY, 1.0);
223	/* pretend we hit surface */
224	thisray.rot = 1.0;
225	thisray.rod = 1.0;
226	VCOPY(thisray.ron, dir);
227	for (i = 0; i < 3; i++) /* fudge factor */
228	thisray.rop[i] = org[i] + 1e-4*dir[i];
229	/* compute and print */
230	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
231	oputv(&thisray);
232	if (outform == 'a')
233	putchar('\n');
234	}
235
236
237	getvec(vec, fmt, fp) /* get a vector from fp */
238	register FVECT vec;
239	int fmt;
240	FILE *fp;
241	{
242	extern char *fgetword();
243	static float vf[3];
244	char buf[32];
245	register int i;
246
247	switch (fmt) {
248	case 'a': /* ascii */
249	for (i = 0; i < 3; i++) {
250	if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
251	!isflt(buf))
252	return(-1);
253	vec[i] = atof(buf);
254	}
255	break;
256	case 'f': /* binary float */
257	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
258	return(-1);
259	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
260	break;
261	case 'd': /* binary double */
262	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
263	return(-1);
264	break;
265	}
266	return(0);
267	}
268
269
270	static
271	ourtrace(r) /* print ray values */
272	RAY *r;
273	{
274	register int (**tp)();
275
276	if (every_out[0] == NULL)
277	return;
278	tabin(r);
279	for (tp = every_out; *tp != NULL; tp++)
280	(**tp)(r);
281	putchar('\n');
282	}
283
284
285	static
286	tabin(r) /* tab in appropriate amount */
287	RAY *r;
288	{
289	register RAY *rp;
290
291	for (rp = r->parent; rp != NULL; rp = rp->parent)
292	putchar('\t');
293	}
294
295
296	static
297	oputo(r) /* print origin */
298	register RAY *r;
299	{
300	(*putreal)(r->rorg[0]);
301	(*putreal)(r->rorg[1]);
302	(*putreal)(r->rorg[2]);
303	}
304
305
306	static
307	oputd(r) /* print direction */
308	register RAY *r;
309	{
310	(*putreal)(r->rdir[0]);
311	(*putreal)(r->rdir[1]);
312	(*putreal)(r->rdir[2]);
313	}
314
315
316	static
317	oputv(r) /* print value */
318	register RAY *r;
319	{
320	(*putreal)(colval(r->rcol,RED));
321	(*putreal)(colval(r->rcol,GRN));
322	(*putreal)(colval(r->rcol,BLU));
323	}
324
325
326	static
327	oputl(r) /* print length */
328	register RAY *r;
329	{
330	(*putreal)(r->rt);
331	}
332
333
334	static
335	oputp(r) /* print point */
336	register RAY *r;
337	{
338	if (r->rot < FHUGE) {
339	(*putreal)(r->rop[0]);
340	(*putreal)(r->rop[1]);
341	(*putreal)(r->rop[2]);
342	} else {
343	(*putreal)(0.0);
344	(*putreal)(0.0);
345	(*putreal)(0.0);
346	}
347	}
348
349
350	static
351	oputn(r) /* print normal */
352	register RAY *r;
353	{
354	if (r->rot < FHUGE) {
355	(*putreal)(r->ron[0]);
356	(*putreal)(r->ron[1]);
357	(*putreal)(r->ron[2]);
358	} else {
359	(*putreal)(0.0);
360	(*putreal)(0.0);
361	(*putreal)(0.0);
362	}
363	}
364
365
366	static
367	oputs(r) /* print name */
368	register RAY *r;
369	{
370	if (r->ro != NULL)
371	fputs(r->ro->oname, stdout);
372	else
373	putchar('*');
374	putchar('\t');
375	}
376
377
378	static
379	oputw(r) /* print weight */
380	register RAY *r;
381	{
382	(*putreal)(r->rweight);
383	}
384
385
386	static
387	oputm(r) /* print modifier */
388	register RAY *r;
389	{
390	if (r->ro != NULL)
391	fputs(objptr(r->ro->omod)->oname, stdout);
392	else
393	putchar('*');
394	putchar('\t');
395	}
396
397
398	static
399	puta(v) /* print ascii value */
400	double v;
401	{
402	printf("%e\t", v);
403	}
404
405
406	static
407	putd(v) /* print binary double */
408	double v;
409	{
410	fwrite((char *)&v, sizeof(v), 1, stdout);
411	}
412
413
414	static
415	putf(v) /* print binary float */
416	double v;
417	{
418	float f = v;
419
420	fwrite((char *)&f, sizeof(f), 1, stdout);
421	}