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  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:	1.14
Committed:	Tue May 21 17:41:23 1991 UTC (32 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+5 -0 lines
Log Message:	added stratified random sampling with urand
#	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	1.1
50			int maxdepth = 6; /* maximum recursion depth */
51			double minweight = 4e-3; /* minimum ray weight */
52
53			COLOR ambval = BLKCOLOR; /* ambient value */
54			double ambacc = 0.2; /* ambient accuracy */
55	greg	1.6	int ambres = 32; /* ambient resolution */
56	greg	1.1	int ambdiv = 128; /* ambient divisions */
57			int ambssamp = 0; /* ambient super-samples */
58			int ambounce = 0; /* ambient bounces */
59			char amblist[128]; / ambient include/exclude list */
60			int ambincl = -1; /* include == 1, exclude == 0 */
61
62	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
63
64	greg	1.1	static RAY thisray; /* for our convenience */
65
66	greg	1.10	static int oputo(), oputd(), oputv(), oputl(),
67	greg	1.1	oputp(), oputn(), oputs(), oputw(), oputm();
68
69			static int (ray_out[10])(), (every_out[10])();
70	greg	1.11	static int castonly;
71	greg	1.1
72	greg	1.10	static int puta(), putf(), putd();
73	greg	1.1
74			static int (*putreal)();
75
76
77			quit(code) /* quit program */
78			int code;
79			{
80			exit(code);
81			}
82
83
84			rtrace(fname) /* trace rays from file */
85			char *fname;
86			{
87			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
88			long nextflush = hresolu;
89			FILE *fp;
90	greg	1.2	FVECT orig, direc;
91	greg	1.1	/* set up input */
92			if (fname == NULL)
93			fp = stdin;
94			else if ((fp = fopen(fname, "r")) == NULL) {
95			sprintf(errmsg, "cannot open input file \"%s\"", fname);
96			error(SYSTEM, errmsg);
97			}
98			/* set up output */
99			setoutput(outvals);
100			switch (outform) {
101			case 'a': putreal = puta; break;
102			case 'f': putreal = putf; break;
103			case 'd': putreal = putd; break;
104			}
105			/* process file */
106			while (getvec(orig, inform, fp) == 0 &&
107			getvec(direc, inform, fp) == 0) {
108
109	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
110			fflush(stdout);
111			continue;
112			}
113	greg	1.14	samplendx++;
114	greg	1.1	/* compute and print */
115	greg	1.13	if (imm_irrad)
116	greg	1.1	irrad(orig, direc);
117			else
118	greg	1.13	traceray(orig, direc);
119	greg	1.7	/* flush if time */
120	greg	1.1	if (--nextflush == 0) {
121			fflush(stdout);
122			nextflush = hresolu;
123			}
124			if (ferror(stdout))
125			error(SYSTEM, "write error");
126			if (--vcount == 0) /* check for end */
127			break;
128			}
129			if (vcount > 0)
130			error(USER, "read error");
131			fclose(fp);
132			}
133
134
135			setoutput(vs) /* set up output tables */
136			register char *vs;
137			{
138			extern int ourtrace(), (*trace)();
139			register int (**table)() = ray_out;
140
141	greg	1.11	castonly = 1;
142	greg	1.1	while (*vs)
143			switch (*vs++) {
144			case 't': /* trace */
145			*table = NULL;
146			table = every_out;
147			trace = ourtrace;
148	greg	1.11	castonly = 0;
149	greg	1.1	break;
150			case 'o': /* origin */
151			*table++ = oputo;
152			break;
153			case 'd': /* direction */
154			*table++ = oputd;
155			break;
156			case 'v': /* value */
157			*table++ = oputv;
158	greg	1.11	castonly = 0;
159	greg	1.1	break;
160			case 'l': /* length */
161			*table++ = oputl;
162	greg	1.11	castonly = 0;
163	greg	1.1	break;
164			case 'p': /* point */
165			*table++ = oputp;
166			break;
167			case 'n': /* normal */
168			*table++ = oputn;
169			break;
170			case 's': /* surface */
171			*table++ = oputs;
172			break;
173			case 'w': /* weight */
174			*table++ = oputw;
175			break;
176			case 'm': /* modifier */
177			*table++ = oputm;
178			break;
179			}
180			*table = NULL;
181			}
182
183
184	greg	1.13	traceray(org, dir) /* compute and print ray value(s) */
185	greg	1.1	FVECT org, dir;
186			{
187			register int (**tp)();
188
189			VCOPY(thisray.rorg, org);
190			VCOPY(thisray.rdir, dir);
191			rayorigin(&thisray, NULL, PRIMARY, 1.0);
192	greg	1.11	if (castonly)
193			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
194			else
195			rayvalue(&thisray);
196	greg	1.1
197			if (ray_out[0] == NULL)
198			return;
199			for (tp = ray_out; *tp != NULL; tp++)
200			(**tp)(&thisray);
201			if (outform == 'a')
202			putchar('\n');
203			}
204
205
206	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
207	greg	1.1	FVECT org, dir;
208			{
209			register int i;
210
211			for (i = 0; i < 3; i++) {
212			thisray.rorg[i] = org[i] + dir[i];
213			thisray.rdir[i] = -dir[i];
214			}
215			rayorigin(&thisray, NULL, PRIMARY, 1.0);
216			/* pretend we hit surface */
217			thisray.rot = 1.0;
218			thisray.rod = 1.0;
219			VCOPY(thisray.ron, dir);
220			for (i = 0; i < 3; i++) /* fudge factor */
221			thisray.rop[i] = org[i] + 1e-4*dir[i];
222			/* compute and print */
223			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
224			oputv(&thisray);
225			if (outform == 'a')
226			putchar('\n');
227			}
228
229
230			getvec(vec, fmt, fp) /* get a vector from fp */
231			register FVECT vec;
232			int fmt;
233			FILE *fp;
234			{
235			static float vf[3];
236
237			switch (fmt) {
238			case 'a': /* ascii */
239			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
240			return(-1);
241			break;
242			case 'f': /* binary float */
243	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
244	greg	1.1	return(-1);
245			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
246			break;
247			case 'd': /* binary double */
248	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
249	greg	1.1	return(-1);
250			break;
251			}
252			return(0);
253			}
254
255
256			static
257			ourtrace(r) /* print ray values */
258			RAY *r;
259			{
260			register int (**tp)();
261
262			if (every_out[0] == NULL)
263			return;
264			tabin(r);
265			for (tp = every_out; *tp != NULL; tp++)
266			(**tp)(r);
267			putchar('\n');
268			}
269
270
271			static
272			tabin(r) /* tab in appropriate amount */
273			RAY *r;
274			{
275			register RAY *rp;
276
277			for (rp = r->parent; rp != NULL; rp = rp->parent)
278			putchar('\t');
279			}
280
281
282			static
283			oputo(r) /* print origin */
284			register RAY *r;
285			{
286			(*putreal)(r->rorg[0]);
287			(*putreal)(r->rorg[1]);
288			(*putreal)(r->rorg[2]);
289			}
290
291
292			static
293			oputd(r) /* print direction */
294			register RAY *r;
295			{
296			(*putreal)(r->rdir[0]);
297			(*putreal)(r->rdir[1]);
298			(*putreal)(r->rdir[2]);
299			}
300
301
302			static
303			oputv(r) /* print value */
304			register RAY *r;
305			{
306			(*putreal)(colval(r->rcol,RED));
307			(*putreal)(colval(r->rcol,GRN));
308			(*putreal)(colval(r->rcol,BLU));
309			}
310
311
312			static
313			oputl(r) /* print length */
314			register RAY *r;
315			{
316	greg	1.9	(*putreal)(r->rt);
317	greg	1.1	}
318
319
320			static
321			oputp(r) /* print point */
322			register RAY *r;
323			{
324			if (r->rot < FHUGE) {
325			(*putreal)(r->rop[0]);
326			(*putreal)(r->rop[1]);
327			(*putreal)(r->rop[2]);
328			} else {
329			(*putreal)(0.0);
330			(*putreal)(0.0);
331			(*putreal)(0.0);
332			}
333			}
334
335
336			static
337			oputn(r) /* print normal */
338			register RAY *r;
339			{
340			if (r->rot < FHUGE) {
341			(*putreal)(r->ron[0]);
342			(*putreal)(r->ron[1]);
343			(*putreal)(r->ron[2]);
344			} else {
345			(*putreal)(0.0);
346			(*putreal)(0.0);
347			(*putreal)(0.0);
348			}
349			}
350
351
352			static
353			oputs(r) /* print name */
354			register RAY *r;
355			{
356			if (r->ro != NULL)
357			fputs(r->ro->oname, stdout);
358			else
359			putchar('*');
360			putchar('\t');
361			}
362
363
364			static
365			oputw(r) /* print weight */
366			register RAY *r;
367			{
368			(*putreal)(r->rweight);
369			}
370
371
372			static
373			oputm(r) /* print modifier */
374			register RAY *r;
375			{
376			if (r->ro != NULL)
377			fputs(objptr(r->ro->omod)->oname, stdout);
378			else
379			putchar('*');
380			putchar('\t');
381			}
382
383
384			static
385			puta(v) /* print ascii value */
386			double v;
387			{
388			printf("%e\t", v);
389			}
390
391
392			static
393			putd(v) /* print binary double */
394			double v;
395			{
396	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
397	greg	1.1	}
398
399
400			static
401			putf(v) /* print binary float */
402			double v;
403			{
404			float f = v;
405
406	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
407	greg	1.1	}