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 '-oi' or '-oI' options indicate 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)();

static double  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
static OBJREC  Lamb = {
        OVOID, MAT_PLASTIC, "Lambertian",
        {0, 5, NULL, Lambfa}, NULL, -1,
};                                      /* a Lambertian surface */


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 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;
{
        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');
}


Irrad(org, dir)         /* compute irradiance value after intersection */
FVECT  org, dir;
{
                                        /* compute intersection */
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        localhit(&thisray, &thescene);
        if (thisray.ro != NULL)         /* pretend we hit Lambertian surf. */
                (*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:	1.12
Committed:	Thu Mar 28 10:16:35 1991 UTC (33 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.11:	+25 -6 lines
Log Message:	added -oI option for irradiance after intersection
#	User	Rev	Content
1	greg	1.1	/* 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	greg	1.7	* If the direction vector is (0,0,0), then the output is flushed.
20	greg	1.1	* 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	greg	1.12	* radiance is computed. The '-oi' or '-oI' options indicate that
24	greg	1.1	* irradiance values are desired.
25			*/
26
27			#include "ray.h"
28
29	greg	1.11	#include "octree.h"
30
31	greg	1.1	#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	greg	1.4	double shadthresh = .05; /* shadow threshold */
42	greg	1.5	double shadcert = .5; /* shadow certainty */
43	greg	1.1
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	greg	1.6	int ambres = 32; /* ambient resolution */
50	greg	1.1	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	greg	1.10	static int oputo(), oputd(), oputv(), oputl(),
59	greg	1.1	oputp(), oputn(), oputs(), oputw(), oputm();
60
61			static int (ray_out[10])(), (every_out[10])();
62	greg	1.11	static int castonly;
63	greg	1.1
64	greg	1.10	static int puta(), putf(), putd();
65	greg	1.1
66			static int (*putreal)();
67
68	greg	1.12	static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
69			static OBJREC Lamb = {
70			OVOID, MAT_PLASTIC, "Lambertian",
71			{0, 5, NULL, Lambfa}, NULL, -1,
72			}; /* a Lambertian surface */
73	greg	1.1
74	greg	1.12
75	greg	1.1	quit(code) /* quit program */
76			int code;
77			{
78			exit(code);
79			}
80
81
82			rtrace(fname) /* trace rays from file */
83			char *fname;
84			{
85			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
86			long nextflush = hresolu;
87			FILE *fp;
88	greg	1.2	FVECT orig, direc;
89	greg	1.1	/* set up input */
90			if (fname == NULL)
91			fp = stdin;
92			else if ((fp = fopen(fname, "r")) == NULL) {
93			sprintf(errmsg, "cannot open input file \"%s\"", fname);
94			error(SYSTEM, errmsg);
95			}
96			/* set up output */
97			setoutput(outvals);
98			switch (outform) {
99			case 'a': putreal = puta; break;
100			case 'f': putreal = putf; break;
101			case 'd': putreal = putd; break;
102			}
103			/* process file */
104			while (getvec(orig, inform, fp) == 0 &&
105			getvec(direc, inform, fp) == 0) {
106
107	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
108			fflush(stdout);
109			continue;
110			}
111	greg	1.1	/* compute and print */
112			if (outvals[0] == 'i')
113			irrad(orig, direc);
114	greg	1.12	else if (outvals[0] == 'I')
115			Irrad(orig, direc);
116	greg	1.1	else
117			radiance(orig, direc);
118	greg	1.7	/* flush if time */
119	greg	1.1	if (--nextflush == 0) {
120			fflush(stdout);
121			nextflush = hresolu;
122			}
123			if (ferror(stdout))
124			error(SYSTEM, "write error");
125			if (--vcount == 0) /* check for end */
126			break;
127			}
128			if (vcount > 0)
129			error(USER, "read error");
130			fclose(fp);
131			}
132
133
134			setoutput(vs) /* set up output tables */
135			register char *vs;
136			{
137			extern int ourtrace(), (*trace)();
138			register int (**table)() = ray_out;
139
140	greg	1.11	castonly = 1;
141	greg	1.1	while (*vs)
142			switch (*vs++) {
143			case 't': /* trace */
144			*table = NULL;
145			table = every_out;
146			trace = ourtrace;
147	greg	1.11	castonly = 0;
148	greg	1.1	break;
149			case 'o': /* origin */
150			*table++ = oputo;
151			break;
152			case 'd': /* direction */
153			*table++ = oputd;
154			break;
155			case 'v': /* value */
156			*table++ = oputv;
157	greg	1.11	castonly = 0;
158	greg	1.1	break;
159			case 'l': /* length */
160			*table++ = oputl;
161	greg	1.11	castonly = 0;
162	greg	1.1	break;
163			case 'p': /* point */
164			*table++ = oputp;
165			break;
166			case 'n': /* normal */
167			*table++ = oputn;
168			break;
169			case 's': /* surface */
170			*table++ = oputs;
171			break;
172			case 'w': /* weight */
173			*table++ = oputw;
174			break;
175			case 'm': /* modifier */
176			*table++ = oputm;
177			break;
178			}
179			*table = NULL;
180			}
181
182
183			radiance(org, dir) /* compute radiance value */
184			FVECT org, dir;
185			{
186			register int (**tp)();
187
188			VCOPY(thisray.rorg, org);
189			VCOPY(thisray.rdir, dir);
190			rayorigin(&thisray, NULL, PRIMARY, 1.0);
191	greg	1.11	if (castonly)
192			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
193			else
194			rayvalue(&thisray);
195	greg	1.1
196			if (ray_out[0] == NULL)
197			return;
198			for (tp = ray_out; *tp != NULL; tp++)
199			(**tp)(&thisray);
200			if (outform == 'a')
201			putchar('\n');
202			}
203
204
205			irrad(org, dir) /* compute irradiance value */
206			FVECT org, dir;
207			{
208			register int i;
209
210			for (i = 0; i < 3; i++) {
211			thisray.rorg[i] = org[i] + dir[i];
212			thisray.rdir[i] = -dir[i];
213			}
214			rayorigin(&thisray, NULL, PRIMARY, 1.0);
215			/* pretend we hit surface */
216			thisray.rot = 1.0;
217			thisray.rod = 1.0;
218			VCOPY(thisray.ron, dir);
219			for (i = 0; i < 3; i++) /* fudge factor */
220			thisray.rop[i] = org[i] + 1e-4*dir[i];
221			/* compute and print */
222			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
223	greg	1.12	oputv(&thisray);
224			if (outform == 'a')
225			putchar('\n');
226			}
227
228
229			Irrad(org, dir) /* compute irradiance value after intersection */
230			FVECT org, dir;
231			{
232			/* compute intersection */
233			VCOPY(thisray.rorg, org);
234			VCOPY(thisray.rdir, dir);
235			rayorigin(&thisray, NULL, PRIMARY, 1.0);
236			localhit(&thisray, &thescene);
237			if (thisray.ro != NULL) /* pretend we hit Lambertian surf. */
238			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
239	greg	1.1	oputv(&thisray);
240			if (outform == 'a')
241			putchar('\n');
242			}
243
244
245			getvec(vec, fmt, fp) /* get a vector from fp */
246			register FVECT vec;
247			int fmt;
248			FILE *fp;
249			{
250			static float vf[3];
251
252			switch (fmt) {
253			case 'a': /* ascii */
254			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
255			return(-1);
256			break;
257			case 'f': /* binary float */
258	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
259	greg	1.1	return(-1);
260			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
261			break;
262			case 'd': /* binary double */
263	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
264	greg	1.1	return(-1);
265			break;
266			}
267			return(0);
268			}
269
270
271			static
272			ourtrace(r) /* print ray values */
273			RAY *r;
274			{
275			register int (**tp)();
276
277			if (every_out[0] == NULL)
278			return;
279			tabin(r);
280			for (tp = every_out; *tp != NULL; tp++)
281			(**tp)(r);
282			putchar('\n');
283			}
284
285
286			static
287			tabin(r) /* tab in appropriate amount */
288			RAY *r;
289			{
290			register RAY *rp;
291
292			for (rp = r->parent; rp != NULL; rp = rp->parent)
293			putchar('\t');
294			}
295
296
297			static
298			oputo(r) /* print origin */
299			register RAY *r;
300			{
301			(*putreal)(r->rorg[0]);
302			(*putreal)(r->rorg[1]);
303			(*putreal)(r->rorg[2]);
304			}
305
306
307			static
308			oputd(r) /* print direction */
309			register RAY *r;
310			{
311			(*putreal)(r->rdir[0]);
312			(*putreal)(r->rdir[1]);
313			(*putreal)(r->rdir[2]);
314			}
315
316
317			static
318			oputv(r) /* print value */
319			register RAY *r;
320			{
321			(*putreal)(colval(r->rcol,RED));
322			(*putreal)(colval(r->rcol,GRN));
323			(*putreal)(colval(r->rcol,BLU));
324			}
325
326
327			static
328			oputl(r) /* print length */
329			register RAY *r;
330			{
331	greg	1.9	(*putreal)(r->rt);
332	greg	1.1	}
333
334
335			static
336			oputp(r) /* print point */
337			register RAY *r;
338			{
339			if (r->rot < FHUGE) {
340			(*putreal)(r->rop[0]);
341			(*putreal)(r->rop[1]);
342			(*putreal)(r->rop[2]);
343			} else {
344			(*putreal)(0.0);
345			(*putreal)(0.0);
346			(*putreal)(0.0);
347			}
348			}
349
350
351			static
352			oputn(r) /* print normal */
353			register RAY *r;
354			{
355			if (r->rot < FHUGE) {
356			(*putreal)(r->ron[0]);
357			(*putreal)(r->ron[1]);
358			(*putreal)(r->ron[2]);
359			} else {
360			(*putreal)(0.0);
361			(*putreal)(0.0);
362			(*putreal)(0.0);
363			}
364			}
365
366
367			static
368			oputs(r) /* print name */
369			register RAY *r;
370			{
371			if (r->ro != NULL)
372			fputs(r->ro->oname, stdout);
373			else
374			putchar('*');
375			putchar('\t');
376			}
377
378
379			static
380			oputw(r) /* print weight */
381			register RAY *r;
382			{
383			(*putreal)(r->rweight);
384			}
385
386
387			static
388			oputm(r) /* print modifier */
389			register RAY *r;
390			{
391			if (r->ro != NULL)
392			fputs(objptr(r->ro->omod)->oname, stdout);
393			else
394			putchar('*');
395			putchar('\t');
396			}
397
398
399			static
400			puta(v) /* print ascii value */
401			double v;
402			{
403			printf("%e\t", v);
404			}
405
406
407			static
408			putd(v) /* print binary double */
409			double v;
410			{
411	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
412	greg	1.1	}
413
414
415			static
416			putf(v) /* print binary float */
417			double v;
418			{
419			float f = v;
420
421	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
422	greg	1.1	}