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  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;
                }
                                                        /* 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:	1.13
Committed:	Wed May 1 11:16:58 1991 UTC (33 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+9 -29 lines
Log Message:	added -i option for irradiance calculation
#	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 imm_irrad = 0; /* compute immediate irradiance? */
34
35	int inform = 'a'; /* input format */
36	int outform = 'a'; /* output format */
37	char outvals = "v"; / output specification */
38
39	int hresolu = 0; /* horizontal (scan) size */
40	int vresolu = 0; /* vertical resolution */
41
42	double dstrsrc = 0.0; /* square source distribution */
43	double shadthresh = .05; /* shadow threshold */
44	double shadcert = .5; /* shadow certainty */
45
46	int maxdepth = 6; /* maximum recursion depth */
47	double minweight = 4e-3; /* minimum ray weight */
48
49	COLOR ambval = BLKCOLOR; /* ambient value */
50	double ambacc = 0.2; /* ambient accuracy */
51	int ambres = 32; /* ambient resolution */
52	int ambdiv = 128; /* ambient divisions */
53	int ambssamp = 0; /* ambient super-samples */
54	int ambounce = 0; /* ambient bounces */
55	char amblist[128]; / ambient include/exclude list */
56	int ambincl = -1; /* include == 1, exclude == 0 */
57
58	extern OBJREC Lamb; /* a Lambertian surface */
59
60	static RAY thisray; /* for our convenience */
61
62	static int oputo(), oputd(), oputv(), oputl(),
63	oputp(), oputn(), oputs(), oputw(), oputm();
64
65	static int (ray_out[10])(), (every_out[10])();
66	static int castonly;
67
68	static int puta(), putf(), putd();
69
70	static int (*putreal)();
71
72
73	quit(code) /* quit program */
74	int code;
75	{
76	exit(code);
77	}
78
79
80	rtrace(fname) /* trace rays from file */
81	char *fname;
82	{
83	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
84	long nextflush = hresolu;
85	FILE *fp;
86	FVECT orig, direc;
87	/* set up input */
88	if (fname == NULL)
89	fp = stdin;
90	else if ((fp = fopen(fname, "r")) == NULL) {
91	sprintf(errmsg, "cannot open input file \"%s\"", fname);
92	error(SYSTEM, errmsg);
93	}
94	/* set up output */
95	setoutput(outvals);
96	switch (outform) {
97	case 'a': putreal = puta; break;
98	case 'f': putreal = putf; break;
99	case 'd': putreal = putd; break;
100	}
101	/* process file */
102	while (getvec(orig, inform, fp) == 0 &&
103	getvec(direc, inform, fp) == 0) {
104
105	if (normalize(direc) == 0.0) { /* zero ==> flush */
106	fflush(stdout);
107	continue;
108	}
109	/* compute and print */
110	if (imm_irrad)
111	irrad(orig, direc);
112	else
113	traceray(orig, direc);
114	/* flush if time */
115	if (--nextflush == 0) {
116	fflush(stdout);
117	nextflush = hresolu;
118	}
119	if (ferror(stdout))
120	error(SYSTEM, "write error");
121	if (--vcount == 0) /* check for end */
122	break;
123	}
124	if (vcount > 0)
125	error(USER, "read error");
126	fclose(fp);
127	}
128
129
130	setoutput(vs) /* set up output tables */
131	register char *vs;
132	{
133	extern int ourtrace(), (*trace)();
134	register int (**table)() = ray_out;
135
136	castonly = 1;
137	while (*vs)
138	switch (*vs++) {
139	case 't': /* trace */
140	*table = NULL;
141	table = every_out;
142	trace = ourtrace;
143	castonly = 0;
144	break;
145	case 'o': /* origin */
146	*table++ = oputo;
147	break;
148	case 'd': /* direction */
149	*table++ = oputd;
150	break;
151	case 'v': /* value */
152	*table++ = oputv;
153	castonly = 0;
154	break;
155	case 'l': /* length */
156	*table++ = oputl;
157	castonly = 0;
158	break;
159	case 'p': /* point */
160	*table++ = oputp;
161	break;
162	case 'n': /* normal */
163	*table++ = oputn;
164	break;
165	case 's': /* surface */
166	*table++ = oputs;
167	break;
168	case 'w': /* weight */
169	*table++ = oputw;
170	break;
171	case 'm': /* modifier */
172	*table++ = oputm;
173	break;
174	}
175	*table = NULL;
176	}
177
178
179	traceray(org, dir) /* compute and print ray value(s) */
180	FVECT org, dir;
181	{
182	register int (**tp)();
183
184	VCOPY(thisray.rorg, org);
185	VCOPY(thisray.rdir, dir);
186	rayorigin(&thisray, NULL, PRIMARY, 1.0);
187	if (castonly)
188	localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
189	else
190	rayvalue(&thisray);
191
192	if (ray_out[0] == NULL)
193	return;
194	for (tp = ray_out; *tp != NULL; tp++)
195	(**tp)(&thisray);
196	if (outform == 'a')
197	putchar('\n');
198	}
199
200
201	irrad(org, dir) /* compute immediate irradiance value */
202	FVECT org, dir;
203	{
204	register int i;
205
206	for (i = 0; i < 3; i++) {
207	thisray.rorg[i] = org[i] + dir[i];
208	thisray.rdir[i] = -dir[i];
209	}
210	rayorigin(&thisray, NULL, PRIMARY, 1.0);
211	/* pretend we hit surface */
212	thisray.rot = 1.0;
213	thisray.rod = 1.0;
214	VCOPY(thisray.ron, dir);
215	for (i = 0; i < 3; i++) /* fudge factor */
216	thisray.rop[i] = org[i] + 1e-4*dir[i];
217	/* compute and print */
218	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
219	oputv(&thisray);
220	if (outform == 'a')
221	putchar('\n');
222	}
223
224
225	getvec(vec, fmt, fp) /* get a vector from fp */
226	register FVECT vec;
227	int fmt;
228	FILE *fp;
229	{
230	static float vf[3];
231
232	switch (fmt) {
233	case 'a': /* ascii */
234	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
235	return(-1);
236	break;
237	case 'f': /* binary float */
238	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
239	return(-1);
240	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
241	break;
242	case 'd': /* binary double */
243	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
244	return(-1);
245	break;
246	}
247	return(0);
248	}
249
250
251	static
252	ourtrace(r) /* print ray values */
253	RAY *r;
254	{
255	register int (**tp)();
256
257	if (every_out[0] == NULL)
258	return;
259	tabin(r);
260	for (tp = every_out; *tp != NULL; tp++)
261	(**tp)(r);
262	putchar('\n');
263	}
264
265
266	static
267	tabin(r) /* tab in appropriate amount */
268	RAY *r;
269	{
270	register RAY *rp;
271
272	for (rp = r->parent; rp != NULL; rp = rp->parent)
273	putchar('\t');
274	}
275
276
277	static
278	oputo(r) /* print origin */
279	register RAY *r;
280	{
281	(*putreal)(r->rorg[0]);
282	(*putreal)(r->rorg[1]);
283	(*putreal)(r->rorg[2]);
284	}
285
286
287	static
288	oputd(r) /* print direction */
289	register RAY *r;
290	{
291	(*putreal)(r->rdir[0]);
292	(*putreal)(r->rdir[1]);
293	(*putreal)(r->rdir[2]);
294	}
295
296
297	static
298	oputv(r) /* print value */
299	register RAY *r;
300	{
301	(*putreal)(colval(r->rcol,RED));
302	(*putreal)(colval(r->rcol,GRN));
303	(*putreal)(colval(r->rcol,BLU));
304	}
305
306
307	static
308	oputl(r) /* print length */
309	register RAY *r;
310	{
311	(*putreal)(r->rt);
312	}
313
314
315	static
316	oputp(r) /* print point */
317	register RAY *r;
318	{
319	if (r->rot < FHUGE) {
320	(*putreal)(r->rop[0]);
321	(*putreal)(r->rop[1]);
322	(*putreal)(r->rop[2]);
323	} else {
324	(*putreal)(0.0);
325	(*putreal)(0.0);
326	(*putreal)(0.0);
327	}
328	}
329
330
331	static
332	oputn(r) /* print normal */
333	register RAY *r;
334	{
335	if (r->rot < FHUGE) {
336	(*putreal)(r->ron[0]);
337	(*putreal)(r->ron[1]);
338	(*putreal)(r->ron[2]);
339	} else {
340	(*putreal)(0.0);
341	(*putreal)(0.0);
342	(*putreal)(0.0);
343	}
344	}
345
346
347	static
348	oputs(r) /* print name */
349	register RAY *r;
350	{
351	if (r->ro != NULL)
352	fputs(r->ro->oname, stdout);
353	else
354	putchar('*');
355	putchar('\t');
356	}
357
358
359	static
360	oputw(r) /* print weight */
361	register RAY *r;
362	{
363	(*putreal)(r->rweight);
364	}
365
366
367	static
368	oputm(r) /* print modifier */
369	register RAY *r;
370	{
371	if (r->ro != NULL)
372	fputs(objptr(r->ro->omod)->oname, stdout);
373	else
374	putchar('*');
375	putchar('\t');
376	}
377
378
379	static
380	puta(v) /* print ascii value */
381	double v;
382	{
383	printf("%e\t", v);
384	}
385
386
387	static
388	putd(v) /* print binary double */
389	double v;
390	{
391	fwrite((char *)&v, sizeof(v), 1, stdout);
392	}
393
394
395	static
396	putf(v) /* print binary float */
397	double v;
398	{
399	float f = v;
400
401	fwrite((char *)&f, sizeof(f), 1, stdout);
402	}