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 */

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 = 128;                      /* 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, vcol;
                                        /* 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:	1.1
Committed:	Thu Feb 2 10:41:37 1989 UTC (35 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Log Message:	Initial revision
#	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
39	int maxdepth = 6; /* maximum recursion depth */
40	double minweight = 4e-3; /* minimum ray weight */
41
42	COLOR ambval = BLKCOLOR; /* ambient value */
43	double ambacc = 0.2; /* ambient accuracy */
44	int ambres = 128; /* ambient resolution */
45	int ambdiv = 128; /* ambient divisions */
46	int ambssamp = 0; /* ambient super-samples */
47	int ambounce = 0; /* ambient bounces */
48	char amblist[128]; / ambient include/exclude list */
49	int ambincl = -1; /* include == 1, exclude == 0 */
50
51	static RAY thisray; /* for our convenience */
52
53	extern int oputo(), oputd(), oputv(), oputl(),
54	oputp(), oputn(), oputs(), oputw(), oputm();
55
56	static int (ray_out[10])(), (every_out[10])();
57
58	extern int puta(), putf(), putd();
59
60	static int (*putreal)();
61
62
63	quit(code) /* quit program */
64	int code;
65	{
66	exit(code);
67	}
68
69
70	rtrace(fname) /* trace rays from file */
71	char *fname;
72	{
73	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
74	long nextflush = hresolu;
75	FILE *fp;
76	FVECT orig, direc, vcol;
77	/* set up input */
78	if (fname == NULL)
79	fp = stdin;
80	else if ((fp = fopen(fname, "r")) == NULL) {
81	sprintf(errmsg, "cannot open input file \"%s\"", fname);
82	error(SYSTEM, errmsg);
83	}
84	/* set up output */
85	setoutput(outvals);
86	switch (outform) {
87	case 'a': putreal = puta; break;
88	case 'f': putreal = putf; break;
89	case 'd': putreal = putd; break;
90	}
91	/* process file */
92	while (getvec(orig, inform, fp) == 0 &&
93	getvec(direc, inform, fp) == 0) {
94
95	if (normalize(direc) == 0.0)
96	error(USER, "zero direction vector");
97	/* compute and print */
98	if (outvals[0] == 'i')
99	irrad(orig, direc);
100	else
101	radiance(orig, direc);
102	/* flush if requested */
103	if (--nextflush == 0) {
104	fflush(stdout);
105	nextflush = hresolu;
106	}
107	if (ferror(stdout))
108	error(SYSTEM, "write error");
109	if (--vcount == 0) /* check for end */
110	break;
111	}
112	if (vcount > 0)
113	error(USER, "read error");
114	fclose(fp);
115	}
116
117
118	setoutput(vs) /* set up output tables */
119	register char *vs;
120	{
121	extern int ourtrace(), (*trace)();
122	register int (**table)() = ray_out;
123
124	while (*vs)
125	switch (*vs++) {
126	case 't': /* trace */
127	*table = NULL;
128	table = every_out;
129	trace = ourtrace;
130	break;
131	case 'o': /* origin */
132	*table++ = oputo;
133	break;
134	case 'd': /* direction */
135	*table++ = oputd;
136	break;
137	case 'v': /* value */
138	*table++ = oputv;
139	break;
140	case 'l': /* length */
141	*table++ = oputl;
142	break;
143	case 'p': /* point */
144	*table++ = oputp;
145	break;
146	case 'n': /* normal */
147	*table++ = oputn;
148	break;
149	case 's': /* surface */
150	*table++ = oputs;
151	break;
152	case 'w': /* weight */
153	*table++ = oputw;
154	break;
155	case 'm': /* modifier */
156	*table++ = oputm;
157	break;
158	}
159	*table = NULL;
160	}
161
162
163	radiance(org, dir) /* compute radiance value */
164	FVECT org, dir;
165	{
166	register int (**tp)();
167
168	VCOPY(thisray.rorg, org);
169	VCOPY(thisray.rdir, dir);
170	rayorigin(&thisray, NULL, PRIMARY, 1.0);
171	rayvalue(&thisray);
172
173	if (ray_out[0] == NULL)
174	return;
175	for (tp = ray_out; *tp != NULL; tp++)
176	(**tp)(&thisray);
177	if (outform == 'a')
178	putchar('\n');
179	}
180
181
182	irrad(org, dir) /* compute irradiance value */
183	FVECT org, dir;
184	{
185	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
186	static OBJREC Lamb = {
187	OVOID, MAT_PLASTIC, "Lambertian",
188	{0, 5, NULL, Lambfa}, NULL, -1,
189	};
190	register int i;
191
192	for (i = 0; i < 3; i++) {
193	thisray.rorg[i] = org[i] + dir[i];
194	thisray.rdir[i] = -dir[i];
195	}
196	rayorigin(&thisray, NULL, PRIMARY, 1.0);
197	/* pretend we hit surface */
198	thisray.rot = 1.0;
199	thisray.rod = 1.0;
200	VCOPY(thisray.ron, dir);
201	for (i = 0; i < 3; i++) /* fudge factor */
202	thisray.rop[i] = org[i] + 1e-4*dir[i];
203	/* compute and print */
204	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
205	oputv(&thisray);
206	if (outform == 'a')
207	putchar('\n');
208	}
209
210
211	getvec(vec, fmt, fp) /* get a vector from fp */
212	register FVECT vec;
213	int fmt;
214	FILE *fp;
215	{
216	static float vf[3];
217
218	switch (fmt) {
219	case 'a': /* ascii */
220	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
221	return(-1);
222	break;
223	case 'f': /* binary float */
224	if (fread(vf, sizeof(float), 3, fp) != 3)
225	return(-1);
226	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
227	break;
228	case 'd': /* binary double */
229	if (fread(vec, sizeof(double), 3, fp) != 3)
230	return(-1);
231	break;
232	}
233	return(0);
234	}
235
236
237	static
238	ourtrace(r) /* print ray values */
239	RAY *r;
240	{
241	register int (**tp)();
242
243	if (every_out[0] == NULL)
244	return;
245	tabin(r);
246	for (tp = every_out; *tp != NULL; tp++)
247	(**tp)(r);
248	putchar('\n');
249	}
250
251
252	static
253	tabin(r) /* tab in appropriate amount */
254	RAY *r;
255	{
256	register RAY *rp;
257
258	for (rp = r->parent; rp != NULL; rp = rp->parent)
259	putchar('\t');
260	}
261
262
263	static
264	oputo(r) /* print origin */
265	register RAY *r;
266	{
267	(*putreal)(r->rorg[0]);
268	(*putreal)(r->rorg[1]);
269	(*putreal)(r->rorg[2]);
270	}
271
272
273	static
274	oputd(r) /* print direction */
275	register RAY *r;
276	{
277	(*putreal)(r->rdir[0]);
278	(*putreal)(r->rdir[1]);
279	(*putreal)(r->rdir[2]);
280	}
281
282
283	static
284	oputv(r) /* print value */
285	register RAY *r;
286	{
287	(*putreal)(colval(r->rcol,RED));
288	(*putreal)(colval(r->rcol,GRN));
289	(*putreal)(colval(r->rcol,BLU));
290	}
291
292
293	static
294	oputl(r) /* print length */
295	register RAY *r;
296	{
297	if (r->rot < FHUGE)
298	(*putreal)(r->rot);
299	else
300	(*putreal)(0.0);
301	}
302
303
304	static
305	oputp(r) /* print point */
306	register RAY *r;
307	{
308	if (r->rot < FHUGE) {
309	(*putreal)(r->rop[0]);
310	(*putreal)(r->rop[1]);
311	(*putreal)(r->rop[2]);
312	} else {
313	(*putreal)(0.0);
314	(*putreal)(0.0);
315	(*putreal)(0.0);
316	}
317	}
318
319
320	static
321	oputn(r) /* print normal */
322	register RAY *r;
323	{
324	if (r->rot < FHUGE) {
325	(*putreal)(r->ron[0]);
326	(*putreal)(r->ron[1]);
327	(*putreal)(r->ron[2]);
328	} else {
329	(*putreal)(0.0);
330	(*putreal)(0.0);
331	(*putreal)(0.0);
332	}
333	}
334
335
336	static
337	oputs(r) /* print name */
338	register RAY *r;
339	{
340	if (r->ro != NULL)
341	fputs(r->ro->oname, stdout);
342	else
343	putchar('*');
344	putchar('\t');
345	}
346
347
348	static
349	oputw(r) /* print weight */
350	register RAY *r;
351	{
352	(*putreal)(r->rweight);
353	}
354
355
356	static
357	oputm(r) /* print modifier */
358	register RAY *r;
359	{
360	if (r->ro != NULL)
361	fputs(objptr(r->ro->omod)->oname, stdout);
362	else
363	putchar('*');
364	putchar('\t');
365	}
366
367
368	static
369	puta(v) /* print ascii value */
370	double v;
371	{
372	printf("%e\t", v);
373	}
374
375
376	static
377	putd(v) /* print binary double */
378	double v;
379	{
380	fwrite(&v, sizeof(v), 1, stdout);
381	}
382
383
384	static
385	putf(v) /* print binary float */
386	double v;
387	{
388	float f = v;
389
390	fwrite(&f, sizeof(f), 1, stdout);
391	}