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  "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  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;

        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((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:	1.10
Committed:	Tue Jun 26 09:00:15 1990 UTC (33 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+2 -2 lines
Log Message:	Nit-picking for Stardent C-compiler
#	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 "otypes.h"
30
31	int inform = 'a'; /* input format */
32	int outform = 'a'; /* output format */
33	char outvals = "v"; / output specification */
34
35	int hresolu = 0; /* horizontal (scan) size */
36	int vresolu = 0; /* vertical resolution */
37
38	double dstrsrc = 0.0; /* square source distribution */
39	double shadthresh = .05; /* shadow threshold */
40	double shadcert = .5; /* shadow certainty */
41
42	int maxdepth = 6; /* maximum recursion depth */
43	double minweight = 4e-3; /* minimum ray weight */
44
45	COLOR ambval = BLKCOLOR; /* ambient value */
46	double ambacc = 0.2; /* ambient accuracy */
47	int ambres = 32; /* ambient resolution */
48	int ambdiv = 128; /* ambient divisions */
49	int ambssamp = 0; /* ambient super-samples */
50	int ambounce = 0; /* ambient bounces */
51	char amblist[128]; / ambient include/exclude list */
52	int ambincl = -1; /* include == 1, exclude == 0 */
53
54	static RAY thisray; /* for our convenience */
55
56	static int oputo(), oputd(), oputv(), oputl(),
57	oputp(), oputn(), oputs(), oputw(), oputm();
58
59	static int (ray_out[10])(), (every_out[10])();
60
61	static int puta(), putf(), putd();
62
63	static int (*putreal)();
64
65
66	quit(code) /* quit program */
67	int code;
68	{
69	exit(code);
70	}
71
72
73	rtrace(fname) /* trace rays from file */
74	char *fname;
75	{
76	long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
77	long nextflush = hresolu;
78	FILE *fp;
79	FVECT orig, direc;
80	/* set up input */
81	if (fname == NULL)
82	fp = stdin;
83	else if ((fp = fopen(fname, "r")) == NULL) {
84	sprintf(errmsg, "cannot open input file \"%s\"", fname);
85	error(SYSTEM, errmsg);
86	}
87	/* set up output */
88	setoutput(outvals);
89	switch (outform) {
90	case 'a': putreal = puta; break;
91	case 'f': putreal = putf; break;
92	case 'd': putreal = putd; break;
93	}
94	/* process file */
95	while (getvec(orig, inform, fp) == 0 &&
96	getvec(direc, inform, fp) == 0) {
97
98	if (normalize(direc) == 0.0) { /* zero ==> flush */
99	fflush(stdout);
100	continue;
101	}
102	/* compute and print */
103	if (outvals[0] == 'i')
104	irrad(orig, direc);
105	else
106	radiance(orig, direc);
107	/* flush if time */
108	if (--nextflush == 0) {
109	fflush(stdout);
110	nextflush = hresolu;
111	}
112	if (ferror(stdout))
113	error(SYSTEM, "write error");
114	if (--vcount == 0) /* check for end */
115	break;
116	}
117	if (vcount > 0)
118	error(USER, "read error");
119	fclose(fp);
120	}
121
122
123	setoutput(vs) /* set up output tables */
124	register char *vs;
125	{
126	extern int ourtrace(), (*trace)();
127	register int (**table)() = ray_out;
128
129	while (*vs)
130	switch (*vs++) {
131	case 't': /* trace */
132	*table = NULL;
133	table = every_out;
134	trace = ourtrace;
135	break;
136	case 'o': /* origin */
137	*table++ = oputo;
138	break;
139	case 'd': /* direction */
140	*table++ = oputd;
141	break;
142	case 'v': /* value */
143	*table++ = oputv;
144	break;
145	case 'l': /* length */
146	*table++ = oputl;
147	break;
148	case 'p': /* point */
149	*table++ = oputp;
150	break;
151	case 'n': /* normal */
152	*table++ = oputn;
153	break;
154	case 's': /* surface */
155	*table++ = oputs;
156	break;
157	case 'w': /* weight */
158	*table++ = oputw;
159	break;
160	case 'm': /* modifier */
161	*table++ = oputm;
162	break;
163	}
164	*table = NULL;
165	}
166
167
168	radiance(org, dir) /* compute radiance value */
169	FVECT org, dir;
170	{
171	register int (**tp)();
172
173	VCOPY(thisray.rorg, org);
174	VCOPY(thisray.rdir, dir);
175	rayorigin(&thisray, NULL, PRIMARY, 1.0);
176	rayvalue(&thisray);
177
178	if (ray_out[0] == NULL)
179	return;
180	for (tp = ray_out; *tp != NULL; tp++)
181	(**tp)(&thisray);
182	if (outform == 'a')
183	putchar('\n');
184	}
185
186
187	irrad(org, dir) /* compute irradiance value */
188	FVECT org, dir;
189	{
190	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
191	static OBJREC Lamb = {
192	OVOID, MAT_PLASTIC, "Lambertian",
193	{0, 5, NULL, Lambfa}, NULL, -1,
194	};
195	register int i;
196
197	for (i = 0; i < 3; i++) {
198	thisray.rorg[i] = org[i] + dir[i];
199	thisray.rdir[i] = -dir[i];
200	}
201	rayorigin(&thisray, NULL, PRIMARY, 1.0);
202	/* pretend we hit surface */
203	thisray.rot = 1.0;
204	thisray.rod = 1.0;
205	VCOPY(thisray.ron, dir);
206	for (i = 0; i < 3; i++) /* fudge factor */
207	thisray.rop[i] = org[i] + 1e-4*dir[i];
208	/* compute and print */
209	(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
210	oputv(&thisray);
211	if (outform == 'a')
212	putchar('\n');
213	}
214
215
216	getvec(vec, fmt, fp) /* get a vector from fp */
217	register FVECT vec;
218	int fmt;
219	FILE *fp;
220	{
221	static float vf[3];
222
223	switch (fmt) {
224	case 'a': /* ascii */
225	if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
226	return(-1);
227	break;
228	case 'f': /* binary float */
229	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
230	return(-1);
231	vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
232	break;
233	case 'd': /* binary double */
234	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
235	return(-1);
236	break;
237	}
238	return(0);
239	}
240
241
242	static
243	ourtrace(r) /* print ray values */
244	RAY *r;
245	{
246	register int (**tp)();
247
248	if (every_out[0] == NULL)
249	return;
250	tabin(r);
251	for (tp = every_out; *tp != NULL; tp++)
252	(**tp)(r);
253	putchar('\n');
254	}
255
256
257	static
258	tabin(r) /* tab in appropriate amount */
259	RAY *r;
260	{
261	register RAY *rp;
262
263	for (rp = r->parent; rp != NULL; rp = rp->parent)
264	putchar('\t');
265	}
266
267
268	static
269	oputo(r) /* print origin */
270	register RAY *r;
271	{
272	(*putreal)(r->rorg[0]);
273	(*putreal)(r->rorg[1]);
274	(*putreal)(r->rorg[2]);
275	}
276
277
278	static
279	oputd(r) /* print direction */
280	register RAY *r;
281	{
282	(*putreal)(r->rdir[0]);
283	(*putreal)(r->rdir[1]);
284	(*putreal)(r->rdir[2]);
285	}
286
287
288	static
289	oputv(r) /* print value */
290	register RAY *r;
291	{
292	(*putreal)(colval(r->rcol,RED));
293	(*putreal)(colval(r->rcol,GRN));
294	(*putreal)(colval(r->rcol,BLU));
295	}
296
297
298	static
299	oputl(r) /* print length */
300	register RAY *r;
301	{
302	(*putreal)(r->rt);
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((char *)&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((char *)&f, sizeof(f), 1, stdout);
393	}