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  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:	1.17
Committed:	Tue Jun 25 14:06:18 1991 UTC (32 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+1 -1 lines
Log Message:	increased defaults for -dp parameter
#	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
52	int maxdepth = 6; /* maximum recursion depth */
53	double minweight = 4e-3; /* minimum ray weight */
54
55	COLOR ambval = BLKCOLOR; /* ambient value */
56	double ambacc = 0.2; /* ambient accuracy */
57	int ambres = 32; /* ambient resolution */
58	int ambdiv = 128; /* ambient divisions */
59	int ambssamp = 0; /* ambient super-samples */
60	int ambounce = 0; /* ambient bounces */
61	char amblist[128]; / ambient include/exclude list */
62	int ambincl = -1; /* include == 1, exclude == 0 */
63
64	extern OBJREC Lamb; /* a Lambertian surface */
65
66	static RAY thisray; /* for our convenience */
67
68	static int oputo(), oputd(), oputv(), oputl(),
69	oputp(), oputn(), oputs(), oputw(), oputm();
70
71	static int (ray_out[10])(), (every_out[10])();
72	static int castonly;
73
74	static int puta(), putf(), putd();
75
76	static int (*putreal)();
77
78
79	quit(code) /* quit program */
80	int code;
81	{
82	exit(code);
83	}
84
85
86	rtrace(fname) /* trace rays from file */
87	char *fname;
88	{
89	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
90	long nextflush = hresolu;
91	FILE *fp;
92	FVECT orig, direc;
93	/* set up input */
94	if (fname == NULL)
95	fp = stdin;
96	else if ((fp = fopen(fname, "r")) == NULL) {
97	sprintf(errmsg, "cannot open input file \"%s\"", fname);
98	error(SYSTEM, errmsg);
99	}
100	/* set up output */
101	setoutput(outvals);
102	switch (outform) {
103	case 'a': putreal = puta; break;
104	case 'f': putreal = putf; break;
105	case 'd': putreal = putd; break;
106	}
107	/* process file */
108	while (getvec(orig, inform, fp) == 0 &&
109	getvec(direc, inform, fp) == 0) {
110
111	if (normalize(direc) == 0.0) { /* zero ==> flush */
112	fflush(stdout);
113	continue;
114	}
115	samplendx++;
116	/* compute and print */
117	if (imm_irrad)
118	irrad(orig, direc);
119	else
120	traceray(orig, direc);
121	/* flush if time */
122	if (--nextflush == 0) {
123	fflush(stdout);
124	nextflush = hresolu;
125	}
126	if (ferror(stdout))
127	error(SYSTEM, "write error");
128	if (--vcount == 0) /* check for end */
129	break;
130	}
131	if (vcount > 0)
132	error(USER, "read error");
133	fclose(fp);
134	}
135
136
137	setoutput(vs) /* set up output tables */
138	register char *vs;
139	{
140	extern int ourtrace(), (*trace)();
141	register int (**table)() = ray_out;
142
143	castonly = 1;
144	while (*vs)
145	switch (*vs++) {
146	case 't': /* trace */
147	*table = NULL;
148	table = every_out;
149	trace = ourtrace;
150	castonly = 0;
151	break;
152	case 'o': /* origin */
153	*table++ = oputo;
154	break;
155	case 'd': /* direction */
156	*table++ = oputd;
157	break;
158	case 'v': /* value */
159	*table++ = oputv;
160	castonly = 0;
161	break;
162	case 'l': /* length */
163	*table++ = oputl;
164	castonly = 0;
165	break;
166	case 'p': /* point */
167	*table++ = oputp;
168	break;
169	case 'n': /* normal */
170	*table++ = oputn;
171	break;
172	case 's': /* surface */
173	*table++ = oputs;
174	break;
175	case 'w': /* weight */
176	*table++ = oputw;
177	break;
178	case 'm': /* modifier */
179	*table++ = oputm;
180	break;
181	}
182	*table = NULL;
183	}
184
185
186	traceray(org, dir) /* compute and print ray value(s) */
187	FVECT org, dir;
188	{
189	register int (**tp)();
190
191	VCOPY(thisray.rorg, org);
192	VCOPY(thisray.rdir, dir);
193	rayorigin(&thisray, NULL, PRIMARY, 1.0);
194	if (castonly)
195	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
196	else
197	rayvalue(&thisray);
198
199	if (ray_out[0] == NULL)
200	return;
201	for (tp = ray_out; *tp != NULL; tp++)
202	(**tp)(&thisray);
203	if (outform == 'a')
204	putchar('\n');
205	}
206
207
208	irrad(org, dir) /* compute immediate irradiance value */
209	FVECT org, dir;
210	{
211	register int i;
212
213	for (i = 0; i < 3; i++) {
214	thisray.rorg[i] = org[i] + dir[i];
215	thisray.rdir[i] = -dir[i];
216	}
217	rayorigin(&thisray, NULL, PRIMARY, 1.0);
218	/* pretend we hit surface */
219	thisray.rot = 1.0;
220	thisray.rod = 1.0;
221	VCOPY(thisray.ron, dir);
222	for (i = 0; i < 3; i++) /* fudge factor */
223	thisray.rop[i] = org[i] + 1e-4*dir[i];
224	/* compute and print */
225	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
226	oputv(&thisray);
227	if (outform == 'a')
228	putchar('\n');
229	}
230
231
232	getvec(vec, fmt, fp) /* get a vector from fp */
233	register FVECT vec;
234	int fmt;
235	FILE *fp;
236	{
237	static float vf[3];
238
239	switch (fmt) {
240	case 'a': /* ascii */
241	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
242	return(-1);
243	break;
244	case 'f': /* binary float */
245	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
246	return(-1);
247	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
248	break;
249	case 'd': /* binary double */
250	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
251	return(-1);
252	break;
253	}
254	return(0);
255	}
256
257
258	static
259	ourtrace(r) /* print ray values */
260	RAY *r;
261	{
262	register int (**tp)();
263
264	if (every_out[0] == NULL)
265	return;
266	tabin(r);
267	for (tp = every_out; *tp != NULL; tp++)
268	(**tp)(r);
269	putchar('\n');
270	}
271
272
273	static
274	tabin(r) /* tab in appropriate amount */
275	RAY *r;
276	{
277	register RAY *rp;
278
279	for (rp = r->parent; rp != NULL; rp = rp->parent)
280	putchar('\t');
281	}
282
283
284	static
285	oputo(r) /* print origin */
286	register RAY *r;
287	{
288	(*putreal)(r->rorg[0]);
289	(*putreal)(r->rorg[1]);
290	(*putreal)(r->rorg[2]);
291	}
292
293
294	static
295	oputd(r) /* print direction */
296	register RAY *r;
297	{
298	(*putreal)(r->rdir[0]);
299	(*putreal)(r->rdir[1]);
300	(*putreal)(r->rdir[2]);
301	}
302
303
304	static
305	oputv(r) /* print value */
306	register RAY *r;
307	{
308	(*putreal)(colval(r->rcol,RED));
309	(*putreal)(colval(r->rcol,GRN));
310	(*putreal)(colval(r->rcol,BLU));
311	}
312
313
314	static
315	oputl(r) /* print length */
316	register RAY *r;
317	{
318	(*putreal)(r->rt);
319	}
320
321
322	static
323	oputp(r) /* print point */
324	register RAY *r;
325	{
326	if (r->rot < FHUGE) {
327	(*putreal)(r->rop[0]);
328	(*putreal)(r->rop[1]);
329	(*putreal)(r->rop[2]);
330	} else {
331	(*putreal)(0.0);
332	(*putreal)(0.0);
333	(*putreal)(0.0);
334	}
335	}
336
337
338	static
339	oputn(r) /* print normal */
340	register RAY *r;
341	{
342	if (r->rot < FHUGE) {
343	(*putreal)(r->ron[0]);
344	(*putreal)(r->ron[1]);
345	(*putreal)(r->ron[2]);
346	} else {
347	(*putreal)(0.0);
348	(*putreal)(0.0);
349	(*putreal)(0.0);
350	}
351	}
352
353
354	static
355	oputs(r) /* print name */
356	register RAY *r;
357	{
358	if (r->ro != NULL)
359	fputs(r->ro->oname, stdout);
360	else
361	putchar('*');
362	putchar('\t');
363	}
364
365
366	static
367	oputw(r) /* print weight */
368	register RAY *r;
369	{
370	(*putreal)(r->rweight);
371	}
372
373
374	static
375	oputm(r) /* print modifier */
376	register RAY *r;
377	{
378	if (r->ro != NULL)
379	fputs(objptr(r->ro->omod)->oname, stdout);
380	else
381	putchar('*');
382	putchar('\t');
383	}
384
385
386	static
387	puta(v) /* print ascii value */
388	double v;
389	{
390	printf("%e\t", v);
391	}
392
393
394	static
395	putd(v) /* print binary double */
396	double v;
397	{
398	fwrite((char *)&v, sizeof(v), 1, stdout);
399	}
400
401
402	static
403	putf(v) /* print binary float */
404	double v;
405	{
406	float f = v;
407
408	fwrite((char *)&f, sizeof(f), 1, stdout);
409	}