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
#	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			* radiance is computed. The '-i' option indicates that
24			* 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
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	greg	1.2	FVECT orig, direc;
83	greg	1.1	/* 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	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
102			fflush(stdout);
103			continue;
104			}
105	greg	1.1	/* compute and print */
106			if (outvals[0] == 'i')
107			irrad(orig, direc);
108			else
109			radiance(orig, direc);
110	greg	1.7	/* flush if time */
111	greg	1.1	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	greg	1.11	castonly = 1;
133	greg	1.1	while (*vs)
134			switch (*vs++) {
135			case 't': /* trace */
136			*table = NULL;
137			table = every_out;
138			trace = ourtrace;
139	greg	1.11	castonly = 0;
140	greg	1.1	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	greg	1.11	castonly = 0;
150	greg	1.1	break;
151			case 'l': /* length */
152			*table++ = oputl;
153	greg	1.11	castonly = 0;
154	greg	1.1	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	greg	1.11	if (castonly)
184			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
185			else
186			rayvalue(&thisray);
187	greg	1.1
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	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
240	greg	1.1	return(-1);
241			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
242			break;
243			case 'd': /* binary double */
244	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
245	greg	1.1	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	greg	1.9	(*putreal)(r->rt);
313	greg	1.1	}
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	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
393	greg	1.1	}
394
395
396			static
397			putf(v) /* print binary float */
398			double v;
399			{
400			float f = v;
401
402	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
403	greg	1.1	}