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.
 *  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' option indicates that
 *  irradiance values are desired.
 */

#include  "ray.h"

#include  "otypes.h"

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 */

static RAY  thisray;                    /* for our convenience */

extern int  oputo(), oputd(), oputv(), oputl(), 
                oputp(), oputn(), oputs(), oputw(), oputm();

static int  (*ray_out[10])(), (*every_out[10])();

extern 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)
                        error(USER, "zero direction vector");
                                                        /* compute and print */
                if (outvals[0] == 'i')
                        irrad(orig, direc);
                else
                        radiance(orig, direc);
                                                        /* flush if requested */
                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;

        while (*vs)
                switch (*vs++) {
                case 't':                               /* trace */
                        *table = NULL;
                        table = every_out;
                        trace = ourtrace;
                        break;
                case 'o':                               /* origin */
                        *table++ = oputo;
                        break;
                case 'd':                               /* direction */
                        *table++ = oputd;
                        break;
                case 'v':                               /* value */
                        *table++ = oputv;
                        break;
                case 'l':                               /* length */
                        *table++ = oputl;
                        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;
}


radiance(org, dir)              /* compute radiance value */
FVECT  org, dir;
{
        register int  (**tp)();

        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        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 irradiance value */
FVECT  org, dir;
{
        static double  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
        static OBJREC  Lamb = {
                OVOID, MAT_PLASTIC, "Lambertian",
                {0, 5, NULL, Lambfa}, NULL, -1,
        };
        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(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(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;
{
        if (r->rot < FHUGE)
                (*putreal)(r->rot);
        else
                (*putreal)(0.0);
}


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(&v, sizeof(v), 1, stdout);
}


static
putf(v)                         /* print binary float */
double  v;
{
        float f = v;

        fwrite(&f, sizeof(f), 1, stdout);
}
Revision:	1.6
Committed:	Mon Jul 10 15:21:28 1989 UTC (34 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+1 -1 lines
Log Message:	Reduced default ambient resolution
#	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	* All values default to ascii representation of real
20	* numbers. Binary representations can be selected
21	* with '-ff' for float or '-fd' for double. By default,
22	* radiance is computed. The '-i' option indicates that
23	* irradiance values are desired.
24	*/
25
26	#include "ray.h"
27
28	#include "otypes.h"
29
30	int inform = 'a'; /* input format */
31	int outform = 'a'; /* output format */
32	char outvals = "v"; / output specification */
33
34	int hresolu = 0; /* horizontal (scan) size */
35	int vresolu = 0; /* vertical resolution */
36
37	double dstrsrc = 0.0; /* square source distribution */
38	double shadthresh = .05; /* shadow threshold */
39	double shadcert = .5; /* shadow certainty */
40
41	int maxdepth = 6; /* maximum recursion depth */
42	double minweight = 4e-3; /* minimum ray weight */
43
44	COLOR ambval = BLKCOLOR; /* ambient value */
45	double ambacc = 0.2; /* ambient accuracy */
46	int ambres = 32; /* ambient resolution */
47	int ambdiv = 128; /* ambient divisions */
48	int ambssamp = 0; /* ambient super-samples */
49	int ambounce = 0; /* ambient bounces */
50	char amblist[128]; / ambient include/exclude list */
51	int ambincl = -1; /* include == 1, exclude == 0 */
52
53	static RAY thisray; /* for our convenience */
54
55	extern int oputo(), oputd(), oputv(), oputl(),
56	oputp(), oputn(), oputs(), oputw(), oputm();
57
58	static int (ray_out[10])(), (every_out[10])();
59
60	extern int puta(), putf(), putd();
61
62	static int (*putreal)();
63
64
65	quit(code) /* quit program */
66	int code;
67	{
68	exit(code);
69	}
70
71
72	rtrace(fname) /* trace rays from file */
73	char *fname;
74	{
75	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
76	long nextflush = hresolu;
77	FILE *fp;
78	FVECT orig, direc;
79	/* set up input */
80	if (fname == NULL)
81	fp = stdin;
82	else if ((fp = fopen(fname, "r")) == NULL) {
83	sprintf(errmsg, "cannot open input file \"%s\"", fname);
84	error(SYSTEM, errmsg);
85	}
86	/* set up output */
87	setoutput(outvals);
88	switch (outform) {
89	case 'a': putreal = puta; break;
90	case 'f': putreal = putf; break;
91	case 'd': putreal = putd; break;
92	}
93	/* process file */
94	while (getvec(orig, inform, fp) == 0 &&
95	getvec(direc, inform, fp) == 0) {
96
97	if (normalize(direc) == 0.0)
98	error(USER, "zero direction vector");
99	/* compute and print */
100	if (outvals[0] == 'i')
101	irrad(orig, direc);
102	else
103	radiance(orig, direc);
104	/* flush if requested */
105	if (--nextflush == 0) {
106	fflush(stdout);
107	nextflush = hresolu;
108	}
109	if (ferror(stdout))
110	error(SYSTEM, "write error");
111	if (--vcount == 0) /* check for end */
112	break;
113	}
114	if (vcount > 0)
115	error(USER, "read error");
116	fclose(fp);
117	}
118
119
120	setoutput(vs) /* set up output tables */
121	register char *vs;
122	{
123	extern int ourtrace(), (*trace)();
124	register int (**table)() = ray_out;
125
126	while (*vs)
127	switch (*vs++) {
128	case 't': /* trace */
129	*table = NULL;
130	table = every_out;
131	trace = ourtrace;
132	break;
133	case 'o': /* origin */
134	*table++ = oputo;
135	break;
136	case 'd': /* direction */
137	*table++ = oputd;
138	break;
139	case 'v': /* value */
140	*table++ = oputv;
141	break;
142	case 'l': /* length */
143	*table++ = oputl;
144	break;
145	case 'p': /* point */
146	*table++ = oputp;
147	break;
148	case 'n': /* normal */
149	*table++ = oputn;
150	break;
151	case 's': /* surface */
152	*table++ = oputs;
153	break;
154	case 'w': /* weight */
155	*table++ = oputw;
156	break;
157	case 'm': /* modifier */
158	*table++ = oputm;
159	break;
160	}
161	*table = NULL;
162	}
163
164
165	radiance(org, dir) /* compute radiance value */
166	FVECT org, dir;
167	{
168	register int (**tp)();
169
170	VCOPY(thisray.rorg, org);
171	VCOPY(thisray.rdir, dir);
172	rayorigin(&thisray, NULL, PRIMARY, 1.0);
173	rayvalue(&thisray);
174
175	if (ray_out[0] == NULL)
176	return;
177	for (tp = ray_out; *tp != NULL; tp++)
178	(**tp)(&thisray);
179	if (outform == 'a')
180	putchar('\n');
181	}
182
183
184	irrad(org, dir) /* compute irradiance value */
185	FVECT org, dir;
186	{
187	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
188	static OBJREC Lamb = {
189	OVOID, MAT_PLASTIC, "Lambertian",
190	{0, 5, NULL, Lambfa}, NULL, -1,
191	};
192	register int i;
193
194	for (i = 0; i < 3; i++) {
195	thisray.rorg[i] = org[i] + dir[i];
196	thisray.rdir[i] = -dir[i];
197	}
198	rayorigin(&thisray, NULL, PRIMARY, 1.0);
199	/* pretend we hit surface */
200	thisray.rot = 1.0;
201	thisray.rod = 1.0;
202	VCOPY(thisray.ron, dir);
203	for (i = 0; i < 3; i++) /* fudge factor */
204	thisray.rop[i] = org[i] + 1e-4*dir[i];
205	/* compute and print */
206	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
207	oputv(&thisray);
208	if (outform == 'a')
209	putchar('\n');
210	}
211
212
213	getvec(vec, fmt, fp) /* get a vector from fp */
214	register FVECT vec;
215	int fmt;
216	FILE *fp;
217	{
218	static float vf[3];
219
220	switch (fmt) {
221	case 'a': /* ascii */
222	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
223	return(-1);
224	break;
225	case 'f': /* binary float */
226	if (fread(vf, sizeof(float), 3, fp) != 3)
227	return(-1);
228	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
229	break;
230	case 'd': /* binary double */
231	if (fread(vec, sizeof(double), 3, fp) != 3)
232	return(-1);
233	break;
234	}
235	return(0);
236	}
237
238
239	static
240	ourtrace(r) /* print ray values */
241	RAY *r;
242	{
243	register int (**tp)();
244
245	if (every_out[0] == NULL)
246	return;
247	tabin(r);
248	for (tp = every_out; *tp != NULL; tp++)
249	(**tp)(r);
250	putchar('\n');
251	}
252
253
254	static
255	tabin(r) /* tab in appropriate amount */
256	RAY *r;
257	{
258	register RAY *rp;
259
260	for (rp = r->parent; rp != NULL; rp = rp->parent)
261	putchar('\t');
262	}
263
264
265	static
266	oputo(r) /* print origin */
267	register RAY *r;
268	{
269	(*putreal)(r->rorg[0]);
270	(*putreal)(r->rorg[1]);
271	(*putreal)(r->rorg[2]);
272	}
273
274
275	static
276	oputd(r) /* print direction */
277	register RAY *r;
278	{
279	(*putreal)(r->rdir[0]);
280	(*putreal)(r->rdir[1]);
281	(*putreal)(r->rdir[2]);
282	}
283
284
285	static
286	oputv(r) /* print value */
287	register RAY *r;
288	{
289	(*putreal)(colval(r->rcol,RED));
290	(*putreal)(colval(r->rcol,GRN));
291	(*putreal)(colval(r->rcol,BLU));
292	}
293
294
295	static
296	oputl(r) /* print length */
297	register RAY *r;
298	{
299	if (r->rot < FHUGE)
300	(*putreal)(r->rot);
301	else
302	(*putreal)(0.0);
303	}
304
305
306	static
307	oputp(r) /* print point */
308	register RAY *r;
309	{
310	if (r->rot < FHUGE) {
311	(*putreal)(r->rop[0]);
312	(*putreal)(r->rop[1]);
313	(*putreal)(r->rop[2]);
314	} else {
315	(*putreal)(0.0);
316	(*putreal)(0.0);
317	(*putreal)(0.0);
318	}
319	}
320
321
322	static
323	oputn(r) /* print normal */
324	register RAY *r;
325	{
326	if (r->rot < FHUGE) {
327	(*putreal)(r->ron[0]);
328	(*putreal)(r->ron[1]);
329	(*putreal)(r->ron[2]);
330	} else {
331	(*putreal)(0.0);
332	(*putreal)(0.0);
333	(*putreal)(0.0);
334	}
335	}
336
337
338	static
339	oputs(r) /* print name */
340	register RAY *r;
341	{
342	if (r->ro != NULL)
343	fputs(r->ro->oname, stdout);
344	else
345	putchar('*');
346	putchar('\t');
347	}
348
349
350	static
351	oputw(r) /* print weight */
352	register RAY *r;
353	{
354	(*putreal)(r->rweight);
355	}
356
357
358	static
359	oputm(r) /* print modifier */
360	register RAY *r;
361	{
362	if (r->ro != NULL)
363	fputs(objptr(r->ro->omod)->oname, stdout);
364	else
365	putchar('*');
366	putchar('\t');
367	}
368
369
370	static
371	puta(v) /* print ascii value */
372	double v;
373	{
374	printf("%e\t", v);
375	}
376
377
378	static
379	putd(v) /* print binary double */
380	double v;
381	{
382	fwrite(&v, sizeof(v), 1, stdout);
383	}
384
385
386	static
387	putf(v) /* print binary float */
388	double v;
389	{
390	float f = v;
391
392	fwrite(&f, sizeof(f), 1, stdout);
393	}