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 */

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;
                                        /* 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:	1.4
Committed:	Wed Jun 7 21:00:59 1989 UTC (34 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+1 -1 lines
Log Message:	Changed direct threshold testing so that it is certain
#	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
40	int maxdepth = 6; /* maximum recursion depth */
41	double minweight = 4e-3; /* minimum ray weight */
42
43	COLOR ambval = BLKCOLOR; /* ambient value */
44	double ambacc = 0.2; /* ambient accuracy */
45	int ambres = 128; /* ambient resolution */
46	int ambdiv = 128; /* ambient divisions */
47	int ambssamp = 0; /* ambient super-samples */
48	int ambounce = 0; /* ambient bounces */
49	char amblist[128]; / ambient include/exclude list */
50	int ambincl = -1; /* include == 1, exclude == 0 */
51
52	static RAY thisray; /* for our convenience */
53
54	extern int oputo(), oputd(), oputv(), oputl(),
55	oputp(), oputn(), oputs(), oputw(), oputm();
56
57	static int (ray_out[10])(), (every_out[10])();
58
59	extern int puta(), putf(), putd();
60
61	static int (*putreal)();
62
63
64	quit(code) /* quit program */
65	int code;
66	{
67	exit(code);
68	}
69
70
71	rtrace(fname) /* trace rays from file */
72	char *fname;
73	{
74	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
75	long nextflush = hresolu;
76	FILE *fp;
77	FVECT orig, direc;
78	/* set up input */
79	if (fname == NULL)
80	fp = stdin;
81	else if ((fp = fopen(fname, "r")) == NULL) {
82	sprintf(errmsg, "cannot open input file \"%s\"", fname);
83	error(SYSTEM, errmsg);
84	}
85	/* set up output */
86	setoutput(outvals);
87	switch (outform) {
88	case 'a': putreal = puta; break;
89	case 'f': putreal = putf; break;
90	case 'd': putreal = putd; break;
91	}
92	/* process file */
93	while (getvec(orig, inform, fp) == 0 &&
94	getvec(direc, inform, fp) == 0) {
95
96	if (normalize(direc) == 0.0)
97	error(USER, "zero direction vector");
98	/* compute and print */
99	if (outvals[0] == 'i')
100	irrad(orig, direc);
101	else
102	radiance(orig, direc);
103	/* flush if requested */
104	if (--nextflush == 0) {
105	fflush(stdout);
106	nextflush = hresolu;
107	}
108	if (ferror(stdout))
109	error(SYSTEM, "write error");
110	if (--vcount == 0) /* check for end */
111	break;
112	}
113	if (vcount > 0)
114	error(USER, "read error");
115	fclose(fp);
116	}
117
118
119	setoutput(vs) /* set up output tables */
120	register char *vs;
121	{
122	extern int ourtrace(), (*trace)();
123	register int (**table)() = ray_out;
124
125	while (*vs)
126	switch (*vs++) {
127	case 't': /* trace */
128	*table = NULL;
129	table = every_out;
130	trace = ourtrace;
131	break;
132	case 'o': /* origin */
133	*table++ = oputo;
134	break;
135	case 'd': /* direction */
136	*table++ = oputd;
137	break;
138	case 'v': /* value */
139	*table++ = oputv;
140	break;
141	case 'l': /* length */
142	*table++ = oputl;
143	break;
144	case 'p': /* point */
145	*table++ = oputp;
146	break;
147	case 'n': /* normal */
148	*table++ = oputn;
149	break;
150	case 's': /* surface */
151	*table++ = oputs;
152	break;
153	case 'w': /* weight */
154	*table++ = oputw;
155	break;
156	case 'm': /* modifier */
157	*table++ = oputm;
158	break;
159	}
160	*table = NULL;
161	}
162
163
164	radiance(org, dir) /* compute radiance value */
165	FVECT org, dir;
166	{
167	register int (**tp)();
168
169	VCOPY(thisray.rorg, org);
170	VCOPY(thisray.rdir, dir);
171	rayorigin(&thisray, NULL, PRIMARY, 1.0);
172	rayvalue(&thisray);
173
174	if (ray_out[0] == NULL)
175	return;
176	for (tp = ray_out; *tp != NULL; tp++)
177	(**tp)(&thisray);
178	if (outform == 'a')
179	putchar('\n');
180	}
181
182
183	irrad(org, dir) /* compute irradiance value */
184	FVECT org, dir;
185	{
186	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
187	static OBJREC Lamb = {
188	OVOID, MAT_PLASTIC, "Lambertian",
189	{0, 5, NULL, Lambfa}, NULL, -1,
190	};
191	register int i;
192
193	for (i = 0; i < 3; i++) {
194	thisray.rorg[i] = org[i] + dir[i];
195	thisray.rdir[i] = -dir[i];
196	}
197	rayorigin(&thisray, NULL, PRIMARY, 1.0);
198	/* pretend we hit surface */
199	thisray.rot = 1.0;
200	thisray.rod = 1.0;
201	VCOPY(thisray.ron, dir);
202	for (i = 0; i < 3; i++) /* fudge factor */
203	thisray.rop[i] = org[i] + 1e-4*dir[i];
204	/* compute and print */
205	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
206	oputv(&thisray);
207	if (outform == 'a')
208	putchar('\n');
209	}
210
211
212	getvec(vec, fmt, fp) /* get a vector from fp */
213	register FVECT vec;
214	int fmt;
215	FILE *fp;
216	{
217	static float vf[3];
218
219	switch (fmt) {
220	case 'a': /* ascii */
221	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
222	return(-1);
223	break;
224	case 'f': /* binary float */
225	if (fread(vf, sizeof(float), 3, fp) != 3)
226	return(-1);
227	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
228	break;
229	case 'd': /* binary double */
230	if (fread(vec, sizeof(double), 3, fp) != 3)
231	return(-1);
232	break;
233	}
234	return(0);
235	}
236
237
238	static
239	ourtrace(r) /* print ray values */
240	RAY *r;
241	{
242	register int (**tp)();
243
244	if (every_out[0] == NULL)
245	return;
246	tabin(r);
247	for (tp = every_out; *tp != NULL; tp++)
248	(**tp)(r);
249	putchar('\n');
250	}
251
252
253	static
254	tabin(r) /* tab in appropriate amount */
255	RAY *r;
256	{
257	register RAY *rp;
258
259	for (rp = r->parent; rp != NULL; rp = rp->parent)
260	putchar('\t');
261	}
262
263
264	static
265	oputo(r) /* print origin */
266	register RAY *r;
267	{
268	(*putreal)(r->rorg[0]);
269	(*putreal)(r->rorg[1]);
270	(*putreal)(r->rorg[2]);
271	}
272
273
274	static
275	oputd(r) /* print direction */
276	register RAY *r;
277	{
278	(*putreal)(r->rdir[0]);
279	(*putreal)(r->rdir[1]);
280	(*putreal)(r->rdir[2]);
281	}
282
283
284	static
285	oputv(r) /* print value */
286	register RAY *r;
287	{
288	(*putreal)(colval(r->rcol,RED));
289	(*putreal)(colval(r->rcol,GRN));
290	(*putreal)(colval(r->rcol,BLU));
291	}
292
293
294	static
295	oputl(r) /* print length */
296	register RAY *r;
297	{
298	if (r->rot < FHUGE)
299	(*putreal)(r->rot);
300	else
301	(*putreal)(0.0);
302	}
303
304
305	static
306	oputp(r) /* print point */
307	register RAY *r;
308	{
309	if (r->rot < FHUGE) {
310	(*putreal)(r->rop[0]);
311	(*putreal)(r->rop[1]);
312	(*putreal)(r->rop[2]);
313	} else {
314	(*putreal)(0.0);
315	(*putreal)(0.0);
316	(*putreal)(0.0);
317	}
318	}
319
320
321	static
322	oputn(r) /* print normal */
323	register RAY *r;
324	{
325	if (r->rot < FHUGE) {
326	(*putreal)(r->ron[0]);
327	(*putreal)(r->ron[1]);
328	(*putreal)(r->ron[2]);
329	} else {
330	(*putreal)(0.0);
331	(*putreal)(0.0);
332	(*putreal)(0.0);
333	}
334	}
335
336
337	static
338	oputs(r) /* print name */
339	register RAY *r;
340	{
341	if (r->ro != NULL)
342	fputs(r->ro->oname, stdout);
343	else
344	putchar('*');
345	putchar('\t');
346	}
347
348
349	static
350	oputw(r) /* print weight */
351	register RAY *r;
352	{
353	(*putreal)(r->rweight);
354	}
355
356
357	static
358	oputm(r) /* print modifier */
359	register RAY *r;
360	{
361	if (r->ro != NULL)
362	fputs(objptr(r->ro->omod)->oname, stdout);
363	else
364	putchar('*');
365	putchar('\t');
366	}
367
368
369	static
370	puta(v) /* print ascii value */
371	double v;
372	{
373	printf("%e\t", v);
374	}
375
376
377	static
378	putd(v) /* print binary double */
379	double v;
380	{
381	fwrite(&v, sizeof(v), 1, stdout);
382	}
383
384
385	static
386	putf(v) /* print binary float */
387	double v;
388	{
389	float f = v;
390
391	fwrite(&f, sizeof(f), 1, stdout);
392	}