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 = 0;                   /* number of source relays */
int  vspretest = 512;                   /* virtual source pretest density */
int  directinvis = 0;                   /* sources invisible? */

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;
{
        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:	1.18
Committed:	Thu Jul 18 14:43:03 1991 UTC (32 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.17:	+1 -0 lines
Log Message:	added -di option for direct source invisibility
#	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 = 0; /* number of source relays */
50	int vspretest = 512; /* virtual source pretest density */
51	int directinvis = 0; /* sources invisible? */
52
53	int maxdepth = 6; /* maximum recursion depth */
54	double minweight = 4e-3; /* minimum ray weight */
55
56	COLOR ambval = BLKCOLOR; /* ambient value */
57	double ambacc = 0.2; /* ambient accuracy */
58	int ambres = 32; /* ambient resolution */
59	int ambdiv = 128; /* ambient divisions */
60	int ambssamp = 0; /* ambient super-samples */
61	int ambounce = 0; /* ambient bounces */
62	char amblist[128]; / ambient include/exclude list */
63	int ambincl = -1; /* include == 1, exclude == 0 */
64
65	extern OBJREC Lamb; /* a Lambertian surface */
66
67	static RAY thisray; /* for our convenience */
68
69	static int oputo(), oputd(), oputv(), oputl(),
70	oputp(), oputn(), oputs(), oputw(), oputm();
71
72	static int (ray_out[10])(), (every_out[10])();
73	static int castonly;
74
75	static int puta(), putf(), putd();
76
77	static int (*putreal)();
78
79
80	quit(code) /* quit program */
81	int code;
82	{
83	exit(code);
84	}
85
86
87	rtrace(fname) /* trace rays from file */
88	char *fname;
89	{
90	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
91	long nextflush = hresolu;
92	FILE *fp;
93	FVECT orig, direc;
94	/* set up input */
95	if (fname == NULL)
96	fp = stdin;
97	else if ((fp = fopen(fname, "r")) == NULL) {
98	sprintf(errmsg, "cannot open input file \"%s\"", fname);
99	error(SYSTEM, errmsg);
100	}
101	/* set up output */
102	setoutput(outvals);
103	switch (outform) {
104	case 'a': putreal = puta; break;
105	case 'f': putreal = putf; break;
106	case 'd': putreal = putd; break;
107	}
108	/* process file */
109	while (getvec(orig, inform, fp) == 0 &&
110	getvec(direc, inform, fp) == 0) {
111
112	if (normalize(direc) == 0.0) { /* zero ==> flush */
113	fflush(stdout);
114	continue;
115	}
116	samplendx++;
117	/* compute and print */
118	if (imm_irrad)
119	irrad(orig, direc);
120	else
121	traceray(orig, direc);
122	/* flush if time */
123	if (--nextflush == 0) {
124	fflush(stdout);
125	nextflush = hresolu;
126	}
127	if (ferror(stdout))
128	error(SYSTEM, "write error");
129	if (--vcount == 0) /* check for end */
130	break;
131	}
132	if (vcount > 0)
133	error(USER, "read error");
134	fclose(fp);
135	}
136
137
138	setoutput(vs) /* set up output tables */
139	register char *vs;
140	{
141	extern int ourtrace(), (*trace)();
142	register int (**table)() = ray_out;
143
144	castonly = 1;
145	while (*vs)
146	switch (*vs++) {
147	case 't': /* trace */
148	*table = NULL;
149	table = every_out;
150	trace = ourtrace;
151	castonly = 0;
152	break;
153	case 'o': /* origin */
154	*table++ = oputo;
155	break;
156	case 'd': /* direction */
157	*table++ = oputd;
158	break;
159	case 'v': /* value */
160	*table++ = oputv;
161	castonly = 0;
162	break;
163	case 'l': /* length */
164	*table++ = oputl;
165	castonly = 0;
166	break;
167	case 'p': /* point */
168	*table++ = oputp;
169	break;
170	case 'n': /* normal */
171	*table++ = oputn;
172	break;
173	case 's': /* surface */
174	*table++ = oputs;
175	break;
176	case 'w': /* weight */
177	*table++ = oputw;
178	break;
179	case 'm': /* modifier */
180	*table++ = oputm;
181	break;
182	}
183	*table = NULL;
184	}
185
186
187	traceray(org, dir) /* compute and print ray value(s) */
188	FVECT org, dir;
189	{
190	register int (**tp)();
191
192	VCOPY(thisray.rorg, org);
193	VCOPY(thisray.rdir, dir);
194	rayorigin(&thisray, NULL, PRIMARY, 1.0);
195	if (castonly)
196	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
197	else
198	rayvalue(&thisray);
199
200	if (ray_out[0] == NULL)
201	return;
202	for (tp = ray_out; *tp != NULL; tp++)
203	(**tp)(&thisray);
204	if (outform == 'a')
205	putchar('\n');
206	}
207
208
209	irrad(org, dir) /* compute immediate irradiance value */
210	FVECT org, dir;
211	{
212	register int i;
213
214	for (i = 0; i < 3; i++) {
215	thisray.rorg[i] = org[i] + dir[i];
216	thisray.rdir[i] = -dir[i];
217	}
218	rayorigin(&thisray, NULL, PRIMARY, 1.0);
219	/* pretend we hit surface */
220	thisray.rot = 1.0;
221	thisray.rod = 1.0;
222	VCOPY(thisray.ron, dir);
223	for (i = 0; i < 3; i++) /* fudge factor */
224	thisray.rop[i] = org[i] + 1e-4*dir[i];
225	/* compute and print */
226	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
227	oputv(&thisray);
228	if (outform == 'a')
229	putchar('\n');
230	}
231
232
233	getvec(vec, fmt, fp) /* get a vector from fp */
234	register FVECT vec;
235	int fmt;
236	FILE *fp;
237	{
238	static float vf[3];
239
240	switch (fmt) {
241	case 'a': /* ascii */
242	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
243	return(-1);
244	break;
245	case 'f': /* binary float */
246	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
247	return(-1);
248	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
249	break;
250	case 'd': /* binary double */
251	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
252	return(-1);
253	break;
254	}
255	return(0);
256	}
257
258
259	static
260	ourtrace(r) /* print ray values */
261	RAY *r;
262	{
263	register int (**tp)();
264
265	if (every_out[0] == NULL)
266	return;
267	tabin(r);
268	for (tp = every_out; *tp != NULL; tp++)
269	(**tp)(r);
270	putchar('\n');
271	}
272
273
274	static
275	tabin(r) /* tab in appropriate amount */
276	RAY *r;
277	{
278	register RAY *rp;
279
280	for (rp = r->parent; rp != NULL; rp = rp->parent)
281	putchar('\t');
282	}
283
284
285	static
286	oputo(r) /* print origin */
287	register RAY *r;
288	{
289	(*putreal)(r->rorg[0]);
290	(*putreal)(r->rorg[1]);
291	(*putreal)(r->rorg[2]);
292	}
293
294
295	static
296	oputd(r) /* print direction */
297	register RAY *r;
298	{
299	(*putreal)(r->rdir[0]);
300	(*putreal)(r->rdir[1]);
301	(*putreal)(r->rdir[2]);
302	}
303
304
305	static
306	oputv(r) /* print value */
307	register RAY *r;
308	{
309	(*putreal)(colval(r->rcol,RED));
310	(*putreal)(colval(r->rcol,GRN));
311	(*putreal)(colval(r->rcol,BLU));
312	}
313
314
315	static
316	oputl(r) /* print length */
317	register RAY *r;
318	{
319	(*putreal)(r->rt);
320	}
321
322
323	static
324	oputp(r) /* print point */
325	register RAY *r;
326	{
327	if (r->rot < FHUGE) {
328	(*putreal)(r->rop[0]);
329	(*putreal)(r->rop[1]);
330	(*putreal)(r->rop[2]);
331	} else {
332	(*putreal)(0.0);
333	(*putreal)(0.0);
334	(*putreal)(0.0);
335	}
336	}
337
338
339	static
340	oputn(r) /* print normal */
341	register RAY *r;
342	{
343	if (r->rot < FHUGE) {
344	(*putreal)(r->ron[0]);
345	(*putreal)(r->ron[1]);
346	(*putreal)(r->ron[2]);
347	} else {
348	(*putreal)(0.0);
349	(*putreal)(0.0);
350	(*putreal)(0.0);
351	}
352	}
353
354
355	static
356	oputs(r) /* print name */
357	register RAY *r;
358	{
359	if (r->ro != NULL)
360	fputs(r->ro->oname, stdout);
361	else
362	putchar('*');
363	putchar('\t');
364	}
365
366
367	static
368	oputw(r) /* print weight */
369	register RAY *r;
370	{
371	(*putreal)(r->rweight);
372	}
373
374
375	static
376	oputm(r) /* print modifier */
377	register RAY *r;
378	{
379	if (r->ro != NULL)
380	fputs(objptr(r->ro->omod)->oname, stdout);
381	else
382	putchar('*');
383	putchar('\t');
384	}
385
386
387	static
388	puta(v) /* print ascii value */
389	double v;
390	{
391	printf("%e\t", v);
392	}
393
394
395	static
396	putd(v) /* print binary double */
397	double v;
398	{
399	fwrite((char *)&v, sizeof(v), 1, stdout);
400	}
401
402
403	static
404	putf(v) /* print binary float */
405	double v;
406	{
407	float f = v;
408
409	fwrite((char *)&f, sizeof(f), 1, stdout);
410	}