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

#include  "ray.h"

#include  "octree.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 */

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;
                }
                                                        /* compute and print */
                if (outvals[0] == 'i')
                        irrad(orig, direc);
                else
                        radiance(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;
}


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);
        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 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((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:	1.11
Committed:	Sat Aug 18 10:34:47 1990 UTC (33 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+11 -1 lines
Log Message:	added conditional ray casting to rtrace for efficiency
#	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' option indicates 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 inform = 'a'; /* input format */
34	int outform = 'a'; /* output format */
35	char outvals = "v"; / output specification */
36
37	int hresolu = 0; /* horizontal (scan) size */
38	int vresolu = 0; /* vertical resolution */
39
40	double dstrsrc = 0.0; /* square source distribution */
41	double shadthresh = .05; /* shadow threshold */
42	double shadcert = .5; /* shadow certainty */
43
44	int maxdepth = 6; /* maximum recursion depth */
45	double minweight = 4e-3; /* minimum ray weight */
46
47	COLOR ambval = BLKCOLOR; /* ambient value */
48	double ambacc = 0.2; /* ambient accuracy */
49	int ambres = 32; /* ambient resolution */
50	int ambdiv = 128; /* ambient divisions */
51	int ambssamp = 0; /* ambient super-samples */
52	int ambounce = 0; /* ambient bounces */
53	char amblist[128]; / ambient include/exclude list */
54	int ambincl = -1; /* include == 1, exclude == 0 */
55
56	static RAY thisray; /* for our convenience */
57
58	static int oputo(), oputd(), oputv(), oputl(),
59	oputp(), oputn(), oputs(), oputw(), oputm();
60
61	static int (ray_out[10])(), (every_out[10])();
62	static int castonly;
63
64	static int puta(), putf(), putd();
65
66	static int (*putreal)();
67
68
69	quit(code) /* quit program */
70	int code;
71	{
72	exit(code);
73	}
74
75
76	rtrace(fname) /* trace rays from file */
77	char *fname;
78	{
79	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
80	long nextflush = hresolu;
81	FILE *fp;
82	FVECT orig, direc;
83	/* set up input */
84	if (fname == NULL)
85	fp = stdin;
86	else if ((fp = fopen(fname, "r")) == NULL) {
87	sprintf(errmsg, "cannot open input file \"%s\"", fname);
88	error(SYSTEM, errmsg);
89	}
90	/* set up output */
91	setoutput(outvals);
92	switch (outform) {
93	case 'a': putreal = puta; break;
94	case 'f': putreal = putf; break;
95	case 'd': putreal = putd; break;
96	}
97	/* process file */
98	while (getvec(orig, inform, fp) == 0 &&
99	getvec(direc, inform, fp) == 0) {
100
101	if (normalize(direc) == 0.0) { /* zero ==> flush */
102	fflush(stdout);
103	continue;
104	}
105	/* compute and print */
106	if (outvals[0] == 'i')
107	irrad(orig, direc);
108	else
109	radiance(orig, direc);
110	/* flush if time */
111	if (--nextflush == 0) {
112	fflush(stdout);
113	nextflush = hresolu;
114	}
115	if (ferror(stdout))
116	error(SYSTEM, "write error");
117	if (--vcount == 0) /* check for end */
118	break;
119	}
120	if (vcount > 0)
121	error(USER, "read error");
122	fclose(fp);
123	}
124
125
126	setoutput(vs) /* set up output tables */
127	register char *vs;
128	{
129	extern int ourtrace(), (*trace)();
130	register int (**table)() = ray_out;
131
132	castonly = 1;
133	while (*vs)
134	switch (*vs++) {
135	case 't': /* trace */
136	*table = NULL;
137	table = every_out;
138	trace = ourtrace;
139	castonly = 0;
140	break;
141	case 'o': /* origin */
142	*table++ = oputo;
143	break;
144	case 'd': /* direction */
145	*table++ = oputd;
146	break;
147	case 'v': /* value */
148	*table++ = oputv;
149	castonly = 0;
150	break;
151	case 'l': /* length */
152	*table++ = oputl;
153	castonly = 0;
154	break;
155	case 'p': /* point */
156	*table++ = oputp;
157	break;
158	case 'n': /* normal */
159	*table++ = oputn;
160	break;
161	case 's': /* surface */
162	*table++ = oputs;
163	break;
164	case 'w': /* weight */
165	*table++ = oputw;
166	break;
167	case 'm': /* modifier */
168	*table++ = oputm;
169	break;
170	}
171	*table = NULL;
172	}
173
174
175	radiance(org, dir) /* compute radiance value */
176	FVECT org, dir;
177	{
178	register int (**tp)();
179
180	VCOPY(thisray.rorg, org);
181	VCOPY(thisray.rdir, dir);
182	rayorigin(&thisray, NULL, PRIMARY, 1.0);
183	if (castonly)
184	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
185	else
186	rayvalue(&thisray);
187
188	if (ray_out[0] == NULL)
189	return;
190	for (tp = ray_out; *tp != NULL; tp++)
191	(**tp)(&thisray);
192	if (outform == 'a')
193	putchar('\n');
194	}
195
196
197	irrad(org, dir) /* compute irradiance value */
198	FVECT org, dir;
199	{
200	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
201	static OBJREC Lamb = {
202	OVOID, MAT_PLASTIC, "Lambertian",
203	{0, 5, NULL, Lambfa}, NULL, -1,
204	};
205	register int i;
206
207	for (i = 0; i < 3; i++) {
208	thisray.rorg[i] = org[i] + dir[i];
209	thisray.rdir[i] = -dir[i];
210	}
211	rayorigin(&thisray, NULL, PRIMARY, 1.0);
212	/* pretend we hit surface */
213	thisray.rot = 1.0;
214	thisray.rod = 1.0;
215	VCOPY(thisray.ron, dir);
216	for (i = 0; i < 3; i++) /* fudge factor */
217	thisray.rop[i] = org[i] + 1e-4*dir[i];
218	/* compute and print */
219	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
220	oputv(&thisray);
221	if (outform == 'a')
222	putchar('\n');
223	}
224
225
226	getvec(vec, fmt, fp) /* get a vector from fp */
227	register FVECT vec;
228	int fmt;
229	FILE *fp;
230	{
231	static float vf[3];
232
233	switch (fmt) {
234	case 'a': /* ascii */
235	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
236	return(-1);
237	break;
238	case 'f': /* binary float */
239	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
240	return(-1);
241	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
242	break;
243	case 'd': /* binary double */
244	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
245	return(-1);
246	break;
247	}
248	return(0);
249	}
250
251
252	static
253	ourtrace(r) /* print ray values */
254	RAY *r;
255	{
256	register int (**tp)();
257
258	if (every_out[0] == NULL)
259	return;
260	tabin(r);
261	for (tp = every_out; *tp != NULL; tp++)
262	(**tp)(r);
263	putchar('\n');
264	}
265
266
267	static
268	tabin(r) /* tab in appropriate amount */
269	RAY *r;
270	{
271	register RAY *rp;
272
273	for (rp = r->parent; rp != NULL; rp = rp->parent)
274	putchar('\t');
275	}
276
277
278	static
279	oputo(r) /* print origin */
280	register RAY *r;
281	{
282	(*putreal)(r->rorg[0]);
283	(*putreal)(r->rorg[1]);
284	(*putreal)(r->rorg[2]);
285	}
286
287
288	static
289	oputd(r) /* print direction */
290	register RAY *r;
291	{
292	(*putreal)(r->rdir[0]);
293	(*putreal)(r->rdir[1]);
294	(*putreal)(r->rdir[2]);
295	}
296
297
298	static
299	oputv(r) /* print value */
300	register RAY *r;
301	{
302	(*putreal)(colval(r->rcol,RED));
303	(*putreal)(colval(r->rcol,GRN));
304	(*putreal)(colval(r->rcol,BLU));
305	}
306
307
308	static
309	oputl(r) /* print length */
310	register RAY *r;
311	{
312	(*putreal)(r->rt);
313	}
314
315
316	static
317	oputp(r) /* print point */
318	register RAY *r;
319	{
320	if (r->rot < FHUGE) {
321	(*putreal)(r->rop[0]);
322	(*putreal)(r->rop[1]);
323	(*putreal)(r->rop[2]);
324	} else {
325	(*putreal)(0.0);
326	(*putreal)(0.0);
327	(*putreal)(0.0);
328	}
329	}
330
331
332	static
333	oputn(r) /* print normal */
334	register RAY *r;
335	{
336	if (r->rot < FHUGE) {
337	(*putreal)(r->ron[0]);
338	(*putreal)(r->ron[1]);
339	(*putreal)(r->ron[2]);
340	} else {
341	(*putreal)(0.0);
342	(*putreal)(0.0);
343	(*putreal)(0.0);
344	}
345	}
346
347
348	static
349	oputs(r) /* print name */
350	register RAY *r;
351	{
352	if (r->ro != NULL)
353	fputs(r->ro->oname, stdout);
354	else
355	putchar('*');
356	putchar('\t');
357	}
358
359
360	static
361	oputw(r) /* print weight */
362	register RAY *r;
363	{
364	(*putreal)(r->rweight);
365	}
366
367
368	static
369	oputm(r) /* print modifier */
370	register RAY *r;
371	{
372	if (r->ro != NULL)
373	fputs(objptr(r->ro->omod)->oname, stdout);
374	else
375	putchar('*');
376	putchar('\t');
377	}
378
379
380	static
381	puta(v) /* print ascii value */
382	double v;
383	{
384	printf("%e\t", v);
385	}
386
387
388	static
389	putd(v) /* print binary double */
390	double v;
391	{
392	fwrite((char *)&v, sizeof(v), 1, stdout);
393	}
394
395
396	static
397	putf(v) /* print binary float */
398	double v;
399	{
400	float f = v;
401
402	fwrite((char *)&f, sizeof(f), 1, stdout);
403	}