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 = 0;                   /* number of source relays */
int  vspretest = 512;                   /* virtual source pretest density */

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;
{
        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:	1.17
Committed:	Tue Jun 25 14:06:18 1991 UTC (32 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+1 -1 lines
Log Message:	increased defaults for -dp parameter
#	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	1.15	int directrelay = 0; /* number of source relays */
50	greg	1.17	int vspretest = 512; /* virtual source pretest density */
51	greg	1.1
52			int maxdepth = 6; /* maximum recursion depth */
53			double minweight = 4e-3; /* minimum ray weight */
54
55			COLOR ambval = BLKCOLOR; /* ambient value */
56			double ambacc = 0.2; /* ambient accuracy */
57	greg	1.6	int ambres = 32; /* ambient resolution */
58	greg	1.1	int ambdiv = 128; /* ambient divisions */
59			int ambssamp = 0; /* ambient super-samples */
60			int ambounce = 0; /* ambient bounces */
61			char amblist[128]; / ambient include/exclude list */
62			int ambincl = -1; /* include == 1, exclude == 0 */
63
64	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
65
66	greg	1.1	static RAY thisray; /* for our convenience */
67
68	greg	1.10	static int oputo(), oputd(), oputv(), oputl(),
69	greg	1.1	oputp(), oputn(), oputs(), oputw(), oputm();
70
71			static int (ray_out[10])(), (every_out[10])();
72	greg	1.11	static int castonly;
73	greg	1.1
74	greg	1.10	static int puta(), putf(), putd();
75	greg	1.1
76			static int (*putreal)();
77
78
79			quit(code) /* quit program */
80			int code;
81			{
82			exit(code);
83			}
84
85
86			rtrace(fname) /* trace rays from file */
87			char *fname;
88			{
89			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
90			long nextflush = hresolu;
91			FILE *fp;
92	greg	1.2	FVECT orig, direc;
93	greg	1.1	/* set up input */
94			if (fname == NULL)
95			fp = stdin;
96			else if ((fp = fopen(fname, "r")) == NULL) {
97			sprintf(errmsg, "cannot open input file \"%s\"", fname);
98			error(SYSTEM, errmsg);
99			}
100			/* set up output */
101			setoutput(outvals);
102			switch (outform) {
103			case 'a': putreal = puta; break;
104			case 'f': putreal = putf; break;
105			case 'd': putreal = putd; break;
106			}
107			/* process file */
108			while (getvec(orig, inform, fp) == 0 &&
109			getvec(direc, inform, fp) == 0) {
110
111	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
112			fflush(stdout);
113			continue;
114			}
115	greg	1.14	samplendx++;
116	greg	1.1	/* compute and print */
117	greg	1.13	if (imm_irrad)
118	greg	1.1	irrad(orig, direc);
119			else
120	greg	1.13	traceray(orig, direc);
121	greg	1.7	/* flush if time */
122	greg	1.1	if (--nextflush == 0) {
123			fflush(stdout);
124			nextflush = hresolu;
125			}
126			if (ferror(stdout))
127			error(SYSTEM, "write error");
128			if (--vcount == 0) /* check for end */
129			break;
130			}
131			if (vcount > 0)
132			error(USER, "read error");
133			fclose(fp);
134			}
135
136
137			setoutput(vs) /* set up output tables */
138			register char *vs;
139			{
140			extern int ourtrace(), (*trace)();
141			register int (**table)() = ray_out;
142
143	greg	1.11	castonly = 1;
144	greg	1.1	while (*vs)
145			switch (*vs++) {
146			case 't': /* trace */
147			*table = NULL;
148			table = every_out;
149			trace = ourtrace;
150	greg	1.11	castonly = 0;
151	greg	1.1	break;
152			case 'o': /* origin */
153			*table++ = oputo;
154			break;
155			case 'd': /* direction */
156			*table++ = oputd;
157			break;
158			case 'v': /* value */
159			*table++ = oputv;
160	greg	1.11	castonly = 0;
161	greg	1.1	break;
162			case 'l': /* length */
163			*table++ = oputl;
164	greg	1.11	castonly = 0;
165	greg	1.1	break;
166			case 'p': /* point */
167			*table++ = oputp;
168			break;
169			case 'n': /* normal */
170			*table++ = oputn;
171			break;
172			case 's': /* surface */
173			*table++ = oputs;
174			break;
175			case 'w': /* weight */
176			*table++ = oputw;
177			break;
178			case 'm': /* modifier */
179			*table++ = oputm;
180			break;
181			}
182			*table = NULL;
183			}
184
185
186	greg	1.13	traceray(org, dir) /* compute and print ray value(s) */
187	greg	1.1	FVECT org, dir;
188			{
189			register int (**tp)();
190
191			VCOPY(thisray.rorg, org);
192			VCOPY(thisray.rdir, dir);
193			rayorigin(&thisray, NULL, PRIMARY, 1.0);
194	greg	1.11	if (castonly)
195			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
196			else
197			rayvalue(&thisray);
198	greg	1.1
199			if (ray_out[0] == NULL)
200			return;
201			for (tp = ray_out; *tp != NULL; tp++)
202			(**tp)(&thisray);
203			if (outform == 'a')
204			putchar('\n');
205			}
206
207
208	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
209	greg	1.1	FVECT org, dir;
210			{
211			register int i;
212
213			for (i = 0; i < 3; i++) {
214			thisray.rorg[i] = org[i] + dir[i];
215			thisray.rdir[i] = -dir[i];
216			}
217			rayorigin(&thisray, NULL, PRIMARY, 1.0);
218			/* pretend we hit surface */
219			thisray.rot = 1.0;
220			thisray.rod = 1.0;
221			VCOPY(thisray.ron, dir);
222			for (i = 0; i < 3; i++) /* fudge factor */
223			thisray.rop[i] = org[i] + 1e-4*dir[i];
224			/* compute and print */
225			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
226			oputv(&thisray);
227			if (outform == 'a')
228			putchar('\n');
229			}
230
231
232			getvec(vec, fmt, fp) /* get a vector from fp */
233			register FVECT vec;
234			int fmt;
235			FILE *fp;
236			{
237			static float vf[3];
238
239			switch (fmt) {
240			case 'a': /* ascii */
241			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
242			return(-1);
243			break;
244			case 'f': /* binary float */
245	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
246	greg	1.1	return(-1);
247			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
248			break;
249			case 'd': /* binary double */
250	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
251	greg	1.1	return(-1);
252			break;
253			}
254			return(0);
255			}
256
257
258			static
259			ourtrace(r) /* print ray values */
260			RAY *r;
261			{
262			register int (**tp)();
263
264			if (every_out[0] == NULL)
265			return;
266			tabin(r);
267			for (tp = every_out; *tp != NULL; tp++)
268			(**tp)(r);
269			putchar('\n');
270			}
271
272
273			static
274			tabin(r) /* tab in appropriate amount */
275			RAY *r;
276			{
277			register RAY *rp;
278
279			for (rp = r->parent; rp != NULL; rp = rp->parent)
280			putchar('\t');
281			}
282
283
284			static
285			oputo(r) /* print origin */
286			register RAY *r;
287			{
288			(*putreal)(r->rorg[0]);
289			(*putreal)(r->rorg[1]);
290			(*putreal)(r->rorg[2]);
291			}
292
293
294			static
295			oputd(r) /* print direction */
296			register RAY *r;
297			{
298			(*putreal)(r->rdir[0]);
299			(*putreal)(r->rdir[1]);
300			(*putreal)(r->rdir[2]);
301			}
302
303
304			static
305			oputv(r) /* print value */
306			register RAY *r;
307			{
308			(*putreal)(colval(r->rcol,RED));
309			(*putreal)(colval(r->rcol,GRN));
310			(*putreal)(colval(r->rcol,BLU));
311			}
312
313
314			static
315			oputl(r) /* print length */
316			register RAY *r;
317			{
318	greg	1.9	(*putreal)(r->rt);
319	greg	1.1	}
320
321
322			static
323			oputp(r) /* print point */
324			register RAY *r;
325			{
326			if (r->rot < FHUGE) {
327			(*putreal)(r->rop[0]);
328			(*putreal)(r->rop[1]);
329			(*putreal)(r->rop[2]);
330			} else {
331			(*putreal)(0.0);
332			(*putreal)(0.0);
333			(*putreal)(0.0);
334			}
335			}
336
337
338			static
339			oputn(r) /* print normal */
340			register RAY *r;
341			{
342			if (r->rot < FHUGE) {
343			(*putreal)(r->ron[0]);
344			(*putreal)(r->ron[1]);
345			(*putreal)(r->ron[2]);
346			} else {
347			(*putreal)(0.0);
348			(*putreal)(0.0);
349			(*putreal)(0.0);
350			}
351			}
352
353
354			static
355			oputs(r) /* print name */
356			register RAY *r;
357			{
358			if (r->ro != NULL)
359			fputs(r->ro->oname, stdout);
360			else
361			putchar('*');
362			putchar('\t');
363			}
364
365
366			static
367			oputw(r) /* print weight */
368			register RAY *r;
369			{
370			(*putreal)(r->rweight);
371			}
372
373
374			static
375			oputm(r) /* print modifier */
376			register RAY *r;
377			{
378			if (r->ro != NULL)
379			fputs(objptr(r->ro->omod)->oname, stdout);
380			else
381			putchar('*');
382			putchar('\t');
383			}
384
385
386			static
387			puta(v) /* print ascii value */
388			double v;
389			{
390			printf("%e\t", v);
391			}
392
393
394			static
395			putd(v) /* print binary double */
396			double v;
397			{
398	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
399	greg	1.1	}
400
401
402			static
403			putf(v) /* print binary float */
404			double v;
405			{
406			float f = v;
407
408	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
409	greg	1.1	}