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  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:	1.14
Committed:	Tue May 21 17:41:23 1991 UTC (32 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+5 -0 lines
Log Message:	added stratified random sampling with urand
#	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
50	int maxdepth = 6; /* maximum recursion depth */
51	double minweight = 4e-3; /* minimum ray weight */
52
53	COLOR ambval = BLKCOLOR; /* ambient value */
54	double ambacc = 0.2; /* ambient accuracy */
55	int ambres = 32; /* ambient resolution */
56	int ambdiv = 128; /* ambient divisions */
57	int ambssamp = 0; /* ambient super-samples */
58	int ambounce = 0; /* ambient bounces */
59	char amblist[128]; / ambient include/exclude list */
60	int ambincl = -1; /* include == 1, exclude == 0 */
61
62	extern OBJREC Lamb; /* a Lambertian surface */
63
64	static RAY thisray; /* for our convenience */
65
66	static int oputo(), oputd(), oputv(), oputl(),
67	oputp(), oputn(), oputs(), oputw(), oputm();
68
69	static int (ray_out[10])(), (every_out[10])();
70	static int castonly;
71
72	static int puta(), putf(), putd();
73
74	static int (*putreal)();
75
76
77	quit(code) /* quit program */
78	int code;
79	{
80	exit(code);
81	}
82
83
84	rtrace(fname) /* trace rays from file */
85	char *fname;
86	{
87	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
88	long nextflush = hresolu;
89	FILE *fp;
90	FVECT orig, direc;
91	/* set up input */
92	if (fname == NULL)
93	fp = stdin;
94	else if ((fp = fopen(fname, "r")) == NULL) {
95	sprintf(errmsg, "cannot open input file \"%s\"", fname);
96	error(SYSTEM, errmsg);
97	}
98	/* set up output */
99	setoutput(outvals);
100	switch (outform) {
101	case 'a': putreal = puta; break;
102	case 'f': putreal = putf; break;
103	case 'd': putreal = putd; break;
104	}
105	/* process file */
106	while (getvec(orig, inform, fp) == 0 &&
107	getvec(direc, inform, fp) == 0) {
108
109	if (normalize(direc) == 0.0) { /* zero ==> flush */
110	fflush(stdout);
111	continue;
112	}
113	samplendx++;
114	/* compute and print */
115	if (imm_irrad)
116	irrad(orig, direc);
117	else
118	traceray(orig, direc);
119	/* flush if time */
120	if (--nextflush == 0) {
121	fflush(stdout);
122	nextflush = hresolu;
123	}
124	if (ferror(stdout))
125	error(SYSTEM, "write error");
126	if (--vcount == 0) /* check for end */
127	break;
128	}
129	if (vcount > 0)
130	error(USER, "read error");
131	fclose(fp);
132	}
133
134
135	setoutput(vs) /* set up output tables */
136	register char *vs;
137	{
138	extern int ourtrace(), (*trace)();
139	register int (**table)() = ray_out;
140
141	castonly = 1;
142	while (*vs)
143	switch (*vs++) {
144	case 't': /* trace */
145	*table = NULL;
146	table = every_out;
147	trace = ourtrace;
148	castonly = 0;
149	break;
150	case 'o': /* origin */
151	*table++ = oputo;
152	break;
153	case 'd': /* direction */
154	*table++ = oputd;
155	break;
156	case 'v': /* value */
157	*table++ = oputv;
158	castonly = 0;
159	break;
160	case 'l': /* length */
161	*table++ = oputl;
162	castonly = 0;
163	break;
164	case 'p': /* point */
165	*table++ = oputp;
166	break;
167	case 'n': /* normal */
168	*table++ = oputn;
169	break;
170	case 's': /* surface */
171	*table++ = oputs;
172	break;
173	case 'w': /* weight */
174	*table++ = oputw;
175	break;
176	case 'm': /* modifier */
177	*table++ = oputm;
178	break;
179	}
180	*table = NULL;
181	}
182
183
184	traceray(org, dir) /* compute and print ray value(s) */
185	FVECT org, dir;
186	{
187	register int (**tp)();
188
189	VCOPY(thisray.rorg, org);
190	VCOPY(thisray.rdir, dir);
191	rayorigin(&thisray, NULL, PRIMARY, 1.0);
192	if (castonly)
193	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
194	else
195	rayvalue(&thisray);
196
197	if (ray_out[0] == NULL)
198	return;
199	for (tp = ray_out; *tp != NULL; tp++)
200	(**tp)(&thisray);
201	if (outform == 'a')
202	putchar('\n');
203	}
204
205
206	irrad(org, dir) /* compute immediate irradiance value */
207	FVECT org, dir;
208	{
209	register int i;
210
211	for (i = 0; i < 3; i++) {
212	thisray.rorg[i] = org[i] + dir[i];
213	thisray.rdir[i] = -dir[i];
214	}
215	rayorigin(&thisray, NULL, PRIMARY, 1.0);
216	/* pretend we hit surface */
217	thisray.rot = 1.0;
218	thisray.rod = 1.0;
219	VCOPY(thisray.ron, dir);
220	for (i = 0; i < 3; i++) /* fudge factor */
221	thisray.rop[i] = org[i] + 1e-4*dir[i];
222	/* compute and print */
223	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
224	oputv(&thisray);
225	if (outform == 'a')
226	putchar('\n');
227	}
228
229
230	getvec(vec, fmt, fp) /* get a vector from fp */
231	register FVECT vec;
232	int fmt;
233	FILE *fp;
234	{
235	static float vf[3];
236
237	switch (fmt) {
238	case 'a': /* ascii */
239	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
240	return(-1);
241	break;
242	case 'f': /* binary float */
243	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
244	return(-1);
245	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
246	break;
247	case 'd': /* binary double */
248	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
249	return(-1);
250	break;
251	}
252	return(0);
253	}
254
255
256	static
257	ourtrace(r) /* print ray values */
258	RAY *r;
259	{
260	register int (**tp)();
261
262	if (every_out[0] == NULL)
263	return;
264	tabin(r);
265	for (tp = every_out; *tp != NULL; tp++)
266	(**tp)(r);
267	putchar('\n');
268	}
269
270
271	static
272	tabin(r) /* tab in appropriate amount */
273	RAY *r;
274	{
275	register RAY *rp;
276
277	for (rp = r->parent; rp != NULL; rp = rp->parent)
278	putchar('\t');
279	}
280
281
282	static
283	oputo(r) /* print origin */
284	register RAY *r;
285	{
286	(*putreal)(r->rorg[0]);
287	(*putreal)(r->rorg[1]);
288	(*putreal)(r->rorg[2]);
289	}
290
291
292	static
293	oputd(r) /* print direction */
294	register RAY *r;
295	{
296	(*putreal)(r->rdir[0]);
297	(*putreal)(r->rdir[1]);
298	(*putreal)(r->rdir[2]);
299	}
300
301
302	static
303	oputv(r) /* print value */
304	register RAY *r;
305	{
306	(*putreal)(colval(r->rcol,RED));
307	(*putreal)(colval(r->rcol,GRN));
308	(*putreal)(colval(r->rcol,BLU));
309	}
310
311
312	static
313	oputl(r) /* print length */
314	register RAY *r;
315	{
316	(*putreal)(r->rt);
317	}
318
319
320	static
321	oputp(r) /* print point */
322	register RAY *r;
323	{
324	if (r->rot < FHUGE) {
325	(*putreal)(r->rop[0]);
326	(*putreal)(r->rop[1]);
327	(*putreal)(r->rop[2]);
328	} else {
329	(*putreal)(0.0);
330	(*putreal)(0.0);
331	(*putreal)(0.0);
332	}
333	}
334
335
336	static
337	oputn(r) /* print normal */
338	register RAY *r;
339	{
340	if (r->rot < FHUGE) {
341	(*putreal)(r->ron[0]);
342	(*putreal)(r->ron[1]);
343	(*putreal)(r->ron[2]);
344	} else {
345	(*putreal)(0.0);
346	(*putreal)(0.0);
347	(*putreal)(0.0);
348	}
349	}
350
351
352	static
353	oputs(r) /* print name */
354	register RAY *r;
355	{
356	if (r->ro != NULL)
357	fputs(r->ro->oname, stdout);
358	else
359	putchar('*');
360	putchar('\t');
361	}
362
363
364	static
365	oputw(r) /* print weight */
366	register RAY *r;
367	{
368	(*putreal)(r->rweight);
369	}
370
371
372	static
373	oputm(r) /* print modifier */
374	register RAY *r;
375	{
376	if (r->ro != NULL)
377	fputs(objptr(r->ro->omod)->oname, stdout);
378	else
379	putchar('*');
380	putchar('\t');
381	}
382
383
384	static
385	puta(v) /* print ascii value */
386	double v;
387	{
388	printf("%e\t", v);
389	}
390
391
392	static
393	putd(v) /* print binary double */
394	double v;
395	{
396	fwrite((char *)&v, sizeof(v), 1, stdout);
397	}
398
399
400	static
401	putf(v) /* print binary float */
402	double v;
403	{
404	float f = v;
405
406	fwrite((char *)&f, sizeof(f), 1, stdout);
407	}