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  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:	1.15
Committed:	Wed Jun 19 16:36:48 1991 UTC (32 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+1 -0 lines
Log Message:	added virtual sources
#	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
51	int maxdepth = 6; /* maximum recursion depth */
52	double minweight = 4e-3; /* minimum ray weight */
53
54	COLOR ambval = BLKCOLOR; /* ambient value */
55	double ambacc = 0.2; /* ambient accuracy */
56	int ambres = 32; /* ambient resolution */
57	int ambdiv = 128; /* ambient divisions */
58	int ambssamp = 0; /* ambient super-samples */
59	int ambounce = 0; /* ambient bounces */
60	char amblist[128]; / ambient include/exclude list */
61	int ambincl = -1; /* include == 1, exclude == 0 */
62
63	extern OBJREC Lamb; /* a Lambertian surface */
64
65	static RAY thisray; /* for our convenience */
66
67	static int oputo(), oputd(), oputv(), oputl(),
68	oputp(), oputn(), oputs(), oputw(), oputm();
69
70	static int (ray_out[10])(), (every_out[10])();
71	static int castonly;
72
73	static int puta(), putf(), putd();
74
75	static int (*putreal)();
76
77
78	quit(code) /* quit program */
79	int code;
80	{
81	exit(code);
82	}
83
84
85	rtrace(fname) /* trace rays from file */
86	char *fname;
87	{
88	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
89	long nextflush = hresolu;
90	FILE *fp;
91	FVECT orig, direc;
92	/* set up input */
93	if (fname == NULL)
94	fp = stdin;
95	else if ((fp = fopen(fname, "r")) == NULL) {
96	sprintf(errmsg, "cannot open input file \"%s\"", fname);
97	error(SYSTEM, errmsg);
98	}
99	/* set up output */
100	setoutput(outvals);
101	switch (outform) {
102	case 'a': putreal = puta; break;
103	case 'f': putreal = putf; break;
104	case 'd': putreal = putd; break;
105	}
106	/* process file */
107	while (getvec(orig, inform, fp) == 0 &&
108	getvec(direc, inform, fp) == 0) {
109
110	if (normalize(direc) == 0.0) { /* zero ==> flush */
111	fflush(stdout);
112	continue;
113	}
114	samplendx++;
115	/* compute and print */
116	if (imm_irrad)
117	irrad(orig, direc);
118	else
119	traceray(orig, direc);
120	/* flush if time */
121	if (--nextflush == 0) {
122	fflush(stdout);
123	nextflush = hresolu;
124	}
125	if (ferror(stdout))
126	error(SYSTEM, "write error");
127	if (--vcount == 0) /* check for end */
128	break;
129	}
130	if (vcount > 0)
131	error(USER, "read error");
132	fclose(fp);
133	}
134
135
136	setoutput(vs) /* set up output tables */
137	register char *vs;
138	{
139	extern int ourtrace(), (*trace)();
140	register int (**table)() = ray_out;
141
142	castonly = 1;
143	while (*vs)
144	switch (*vs++) {
145	case 't': /* trace */
146	*table = NULL;
147	table = every_out;
148	trace = ourtrace;
149	castonly = 0;
150	break;
151	case 'o': /* origin */
152	*table++ = oputo;
153	break;
154	case 'd': /* direction */
155	*table++ = oputd;
156	break;
157	case 'v': /* value */
158	*table++ = oputv;
159	castonly = 0;
160	break;
161	case 'l': /* length */
162	*table++ = oputl;
163	castonly = 0;
164	break;
165	case 'p': /* point */
166	*table++ = oputp;
167	break;
168	case 'n': /* normal */
169	*table++ = oputn;
170	break;
171	case 's': /* surface */
172	*table++ = oputs;
173	break;
174	case 'w': /* weight */
175	*table++ = oputw;
176	break;
177	case 'm': /* modifier */
178	*table++ = oputm;
179	break;
180	}
181	*table = NULL;
182	}
183
184
185	traceray(org, dir) /* compute and print ray value(s) */
186	FVECT org, dir;
187	{
188	register int (**tp)();
189
190	VCOPY(thisray.rorg, org);
191	VCOPY(thisray.rdir, dir);
192	rayorigin(&thisray, NULL, PRIMARY, 1.0);
193	if (castonly)
194	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
195	else
196	rayvalue(&thisray);
197
198	if (ray_out[0] == NULL)
199	return;
200	for (tp = ray_out; *tp != NULL; tp++)
201	(**tp)(&thisray);
202	if (outform == 'a')
203	putchar('\n');
204	}
205
206
207	irrad(org, dir) /* compute immediate irradiance value */
208	FVECT org, dir;
209	{
210	register int i;
211
212	for (i = 0; i < 3; i++) {
213	thisray.rorg[i] = org[i] + dir[i];
214	thisray.rdir[i] = -dir[i];
215	}
216	rayorigin(&thisray, NULL, PRIMARY, 1.0);
217	/* pretend we hit surface */
218	thisray.rot = 1.0;
219	thisray.rod = 1.0;
220	VCOPY(thisray.ron, dir);
221	for (i = 0; i < 3; i++) /* fudge factor */
222	thisray.rop[i] = org[i] + 1e-4*dir[i];
223	/* compute and print */
224	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
225	oputv(&thisray);
226	if (outform == 'a')
227	putchar('\n');
228	}
229
230
231	getvec(vec, fmt, fp) /* get a vector from fp */
232	register FVECT vec;
233	int fmt;
234	FILE *fp;
235	{
236	static float vf[3];
237
238	switch (fmt) {
239	case 'a': /* ascii */
240	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
241	return(-1);
242	break;
243	case 'f': /* binary float */
244	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
245	return(-1);
246	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
247	break;
248	case 'd': /* binary double */
249	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
250	return(-1);
251	break;
252	}
253	return(0);
254	}
255
256
257	static
258	ourtrace(r) /* print ray values */
259	RAY *r;
260	{
261	register int (**tp)();
262
263	if (every_out[0] == NULL)
264	return;
265	tabin(r);
266	for (tp = every_out; *tp != NULL; tp++)
267	(**tp)(r);
268	putchar('\n');
269	}
270
271
272	static
273	tabin(r) /* tab in appropriate amount */
274	RAY *r;
275	{
276	register RAY *rp;
277
278	for (rp = r->parent; rp != NULL; rp = rp->parent)
279	putchar('\t');
280	}
281
282
283	static
284	oputo(r) /* print origin */
285	register RAY *r;
286	{
287	(*putreal)(r->rorg[0]);
288	(*putreal)(r->rorg[1]);
289	(*putreal)(r->rorg[2]);
290	}
291
292
293	static
294	oputd(r) /* print direction */
295	register RAY *r;
296	{
297	(*putreal)(r->rdir[0]);
298	(*putreal)(r->rdir[1]);
299	(*putreal)(r->rdir[2]);
300	}
301
302
303	static
304	oputv(r) /* print value */
305	register RAY *r;
306	{
307	(*putreal)(colval(r->rcol,RED));
308	(*putreal)(colval(r->rcol,GRN));
309	(*putreal)(colval(r->rcol,BLU));
310	}
311
312
313	static
314	oputl(r) /* print length */
315	register RAY *r;
316	{
317	(*putreal)(r->rt);
318	}
319
320
321	static
322	oputp(r) /* print point */
323	register RAY *r;
324	{
325	if (r->rot < FHUGE) {
326	(*putreal)(r->rop[0]);
327	(*putreal)(r->rop[1]);
328	(*putreal)(r->rop[2]);
329	} else {
330	(*putreal)(0.0);
331	(*putreal)(0.0);
332	(*putreal)(0.0);
333	}
334	}
335
336
337	static
338	oputn(r) /* print normal */
339	register RAY *r;
340	{
341	if (r->rot < FHUGE) {
342	(*putreal)(r->ron[0]);
343	(*putreal)(r->ron[1]);
344	(*putreal)(r->ron[2]);
345	} else {
346	(*putreal)(0.0);
347	(*putreal)(0.0);
348	(*putreal)(0.0);
349	}
350	}
351
352
353	static
354	oputs(r) /* print name */
355	register RAY *r;
356	{
357	if (r->ro != NULL)
358	fputs(r->ro->oname, stdout);
359	else
360	putchar('*');
361	putchar('\t');
362	}
363
364
365	static
366	oputw(r) /* print weight */
367	register RAY *r;
368	{
369	(*putreal)(r->rweight);
370	}
371
372
373	static
374	oputm(r) /* print modifier */
375	register RAY *r;
376	{
377	if (r->ro != NULL)
378	fputs(objptr(r->ro->omod)->oname, stdout);
379	else
380	putchar('*');
381	putchar('\t');
382	}
383
384
385	static
386	puta(v) /* print ascii value */
387	double v;
388	{
389	printf("%e\t", v);
390	}
391
392
393	static
394	putd(v) /* print binary double */
395	double v;
396	{
397	fwrite((char *)&v, sizeof(v), 1, stdout);
398	}
399
400
401	static
402	putf(v) /* print binary float */
403	double v;
404	{
405	float f = v;
406
407	fwrite((char *)&f, sizeof(f), 1, stdout);
408	}