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  dimlist[MAXDIM];                   /* sampling dimensions */
int  ndims = 0;                         /* number of sampling dimensions */
int  samplendx = 0;                     /* index for this sample */

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  directrelay = 1;                   /* number of source relays */
int  vspretest = 512;                   /* virtual source pretest density */
int  directinvis = 0;                   /* sources invisible? */
double  srcsizerat = .25;               /* maximum ratio source size/dist. */

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;
                }
                samplendx++;
                                                        /* 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;
{
        extern char  *fgetword();
        extern double  atof();
        static float  vf[3];
        char  buf[32];
        register int  i;

        switch (fmt) {
        case 'a':                                       /* ascii */
                for (i = 0; i < 3; i++) {
                        if (fgetword(buf, sizeof(buf), fp) == NULL ||
                                        !isflt(buf))
                                return(-1);
                        vec[i] = atof(buf);
                }
                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:	1.20
Committed:	Mon Oct 21 12:58:10 1991 UTC (32 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+2 -1 lines
Log Message:	added source sampling (-ds option)
#	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	1.13	* radiance is computed. The '-i' or '-I' 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	greg	1.14	int dimlist[MAXDIM]; /* sampling dimensions */
34			int ndims = 0; /* number of sampling dimensions */
35			int samplendx = 0; /* index for this sample */
36
37	greg	1.13	int imm_irrad = 0; /* compute immediate irradiance? */
38
39	greg	1.1	int inform = 'a'; /* input format */
40			int outform = 'a'; /* output format */
41			char outvals = "v"; / output specification */
42
43			int hresolu = 0; /* horizontal (scan) size */
44			int vresolu = 0; /* vertical resolution */
45
46			double dstrsrc = 0.0; /* square source distribution */
47	greg	1.4	double shadthresh = .05; /* shadow threshold */
48	greg	1.5	double shadcert = .5; /* shadow certainty */
49	greg	1.20	int directrelay = 1; /* number of source relays */
50	greg	1.17	int vspretest = 512; /* virtual source pretest density */
51	greg	1.18	int directinvis = 0; /* sources invisible? */
52	greg	1.20	double srcsizerat = .25; /* maximum ratio source size/dist. */
53	greg	1.1
54			int maxdepth = 6; /* maximum recursion depth */
55			double minweight = 4e-3; /* minimum ray weight */
56
57			COLOR ambval = BLKCOLOR; /* ambient value */
58			double ambacc = 0.2; /* ambient accuracy */
59	greg	1.6	int ambres = 32; /* ambient resolution */
60	greg	1.1	int ambdiv = 128; /* ambient divisions */
61			int ambssamp = 0; /* ambient super-samples */
62			int ambounce = 0; /* ambient bounces */
63			char amblist[128]; / ambient include/exclude list */
64			int ambincl = -1; /* include == 1, exclude == 0 */
65
66	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
67
68	greg	1.1	static RAY thisray; /* for our convenience */
69
70	greg	1.10	static int oputo(), oputd(), oputv(), oputl(),
71	greg	1.1	oputp(), oputn(), oputs(), oputw(), oputm();
72
73			static int (ray_out[10])(), (every_out[10])();
74	greg	1.11	static int castonly;
75	greg	1.1
76	greg	1.10	static int puta(), putf(), putd();
77	greg	1.1
78			static int (*putreal)();
79
80
81			quit(code) /* quit program */
82			int code;
83			{
84			exit(code);
85			}
86
87
88			rtrace(fname) /* trace rays from file */
89			char *fname;
90			{
91			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
92			long nextflush = hresolu;
93			FILE *fp;
94	greg	1.2	FVECT orig, direc;
95	greg	1.1	/* set up input */
96			if (fname == NULL)
97			fp = stdin;
98			else if ((fp = fopen(fname, "r")) == NULL) {
99			sprintf(errmsg, "cannot open input file \"%s\"", fname);
100			error(SYSTEM, errmsg);
101			}
102			/* set up output */
103			setoutput(outvals);
104			switch (outform) {
105			case 'a': putreal = puta; break;
106			case 'f': putreal = putf; break;
107			case 'd': putreal = putd; break;
108			}
109			/* process file */
110			while (getvec(orig, inform, fp) == 0 &&
111			getvec(direc, inform, fp) == 0) {
112
113	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
114			fflush(stdout);
115			continue;
116			}
117	greg	1.14	samplendx++;
118	greg	1.1	/* compute and print */
119	greg	1.13	if (imm_irrad)
120	greg	1.1	irrad(orig, direc);
121			else
122	greg	1.13	traceray(orig, direc);
123	greg	1.7	/* flush if time */
124	greg	1.1	if (--nextflush == 0) {
125			fflush(stdout);
126			nextflush = hresolu;
127			}
128			if (ferror(stdout))
129			error(SYSTEM, "write error");
130			if (--vcount == 0) /* check for end */
131			break;
132			}
133			if (vcount > 0)
134			error(USER, "read error");
135			fclose(fp);
136			}
137
138
139			setoutput(vs) /* set up output tables */
140			register char *vs;
141			{
142			extern int ourtrace(), (*trace)();
143			register int (**table)() = ray_out;
144
145	greg	1.11	castonly = 1;
146	greg	1.1	while (*vs)
147			switch (*vs++) {
148			case 't': /* trace */
149			*table = NULL;
150			table = every_out;
151			trace = ourtrace;
152	greg	1.11	castonly = 0;
153	greg	1.1	break;
154			case 'o': /* origin */
155			*table++ = oputo;
156			break;
157			case 'd': /* direction */
158			*table++ = oputd;
159			break;
160			case 'v': /* value */
161			*table++ = oputv;
162	greg	1.11	castonly = 0;
163	greg	1.1	break;
164			case 'l': /* length */
165			*table++ = oputl;
166	greg	1.11	castonly = 0;
167	greg	1.1	break;
168			case 'p': /* point */
169			*table++ = oputp;
170			break;
171			case 'n': /* normal */
172			*table++ = oputn;
173			break;
174			case 's': /* surface */
175			*table++ = oputs;
176			break;
177			case 'w': /* weight */
178			*table++ = oputw;
179			break;
180			case 'm': /* modifier */
181			*table++ = oputm;
182			break;
183			}
184			*table = NULL;
185			}
186
187
188	greg	1.13	traceray(org, dir) /* compute and print ray value(s) */
189	greg	1.1	FVECT org, dir;
190			{
191			register int (**tp)();
192
193			VCOPY(thisray.rorg, org);
194			VCOPY(thisray.rdir, dir);
195			rayorigin(&thisray, NULL, PRIMARY, 1.0);
196	greg	1.11	if (castonly)
197			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
198			else
199			rayvalue(&thisray);
200	greg	1.1
201			if (ray_out[0] == NULL)
202			return;
203			for (tp = ray_out; *tp != NULL; tp++)
204			(**tp)(&thisray);
205			if (outform == 'a')
206			putchar('\n');
207			}
208
209
210	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
211	greg	1.1	FVECT org, dir;
212			{
213			register int i;
214
215			for (i = 0; i < 3; i++) {
216			thisray.rorg[i] = org[i] + dir[i];
217			thisray.rdir[i] = -dir[i];
218			}
219			rayorigin(&thisray, NULL, PRIMARY, 1.0);
220			/* pretend we hit surface */
221			thisray.rot = 1.0;
222			thisray.rod = 1.0;
223			VCOPY(thisray.ron, dir);
224			for (i = 0; i < 3; i++) /* fudge factor */
225			thisray.rop[i] = org[i] + 1e-4*dir[i];
226			/* compute and print */
227			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
228			oputv(&thisray);
229			if (outform == 'a')
230			putchar('\n');
231			}
232
233
234			getvec(vec, fmt, fp) /* get a vector from fp */
235			register FVECT vec;
236			int fmt;
237			FILE *fp;
238			{
239	greg	1.19	extern char *fgetword();
240			extern double atof();
241	greg	1.1	static float vf[3];
242	greg	1.19	char buf[32];
243			register int i;
244	greg	1.1
245			switch (fmt) {
246			case 'a': /* ascii */
247	greg	1.19	for (i = 0; i < 3; i++) {
248			if (fgetword(buf, sizeof(buf), fp) == NULL \|\|
249			!isflt(buf))
250			return(-1);
251			vec[i] = atof(buf);
252			}
253	greg	1.1	break;
254			case 'f': /* binary float */
255	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
256	greg	1.1	return(-1);
257			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
258			break;
259			case 'd': /* binary double */
260	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
261	greg	1.1	return(-1);
262			break;
263			}
264			return(0);
265			}
266
267
268			static
269			ourtrace(r) /* print ray values */
270			RAY *r;
271			{
272			register int (**tp)();
273
274			if (every_out[0] == NULL)
275			return;
276			tabin(r);
277			for (tp = every_out; *tp != NULL; tp++)
278			(**tp)(r);
279			putchar('\n');
280			}
281
282
283			static
284			tabin(r) /* tab in appropriate amount */
285			RAY *r;
286			{
287			register RAY *rp;
288
289			for (rp = r->parent; rp != NULL; rp = rp->parent)
290			putchar('\t');
291			}
292
293
294			static
295			oputo(r) /* print origin */
296			register RAY *r;
297			{
298			(*putreal)(r->rorg[0]);
299			(*putreal)(r->rorg[1]);
300			(*putreal)(r->rorg[2]);
301			}
302
303
304			static
305			oputd(r) /* print direction */
306			register RAY *r;
307			{
308			(*putreal)(r->rdir[0]);
309			(*putreal)(r->rdir[1]);
310			(*putreal)(r->rdir[2]);
311			}
312
313
314			static
315			oputv(r) /* print value */
316			register RAY *r;
317			{
318			(*putreal)(colval(r->rcol,RED));
319			(*putreal)(colval(r->rcol,GRN));
320			(*putreal)(colval(r->rcol,BLU));
321			}
322
323
324			static
325			oputl(r) /* print length */
326			register RAY *r;
327			{
328	greg	1.9	(*putreal)(r->rt);
329	greg	1.1	}
330
331
332			static
333			oputp(r) /* print point */
334			register RAY *r;
335			{
336			if (r->rot < FHUGE) {
337			(*putreal)(r->rop[0]);
338			(*putreal)(r->rop[1]);
339			(*putreal)(r->rop[2]);
340			} else {
341			(*putreal)(0.0);
342			(*putreal)(0.0);
343			(*putreal)(0.0);
344			}
345			}
346
347
348			static
349			oputn(r) /* print normal */
350			register RAY *r;
351			{
352			if (r->rot < FHUGE) {
353			(*putreal)(r->ron[0]);
354			(*putreal)(r->ron[1]);
355			(*putreal)(r->ron[2]);
356			} else {
357			(*putreal)(0.0);
358			(*putreal)(0.0);
359			(*putreal)(0.0);
360			}
361			}
362
363
364			static
365			oputs(r) /* print name */
366			register RAY *r;
367			{
368			if (r->ro != NULL)
369			fputs(r->ro->oname, stdout);
370			else
371			putchar('*');
372			putchar('\t');
373			}
374
375
376			static
377			oputw(r) /* print weight */
378			register RAY *r;
379			{
380			(*putreal)(r->rweight);
381			}
382
383
384			static
385			oputm(r) /* print modifier */
386			register RAY *r;
387			{
388			if (r->ro != NULL)
389			fputs(objptr(r->ro->omod)->oname, stdout);
390			else
391			putchar('*');
392			putchar('\t');
393			}
394
395
396			static
397			puta(v) /* print ascii value */
398			double v;
399			{
400			printf("%e\t", v);
401			}
402
403
404			static
405			putd(v) /* print binary double */
406			double v;
407			{
408	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
409	greg	1.1	}
410
411
412			static
413			putf(v) /* print binary float */
414			double v;
415			{
416			float f = v;
417
418	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
419	greg	1.1	}