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  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;
                }
                                                        /* 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:	1.13
Committed:	Wed May 1 11:16:58 1991 UTC (33 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+9 -29 lines
Log Message:	added -i option for irradiance calculation
#	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	1.13	int imm_irrad = 0; /* compute immediate irradiance? */
34
35	greg	1.1	int inform = 'a'; /* input format */
36			int outform = 'a'; /* output format */
37			char outvals = "v"; / output specification */
38
39			int hresolu = 0; /* horizontal (scan) size */
40			int vresolu = 0; /* vertical resolution */
41
42			double dstrsrc = 0.0; /* square source distribution */
43	greg	1.4	double shadthresh = .05; /* shadow threshold */
44	greg	1.5	double shadcert = .5; /* shadow certainty */
45	greg	1.1
46			int maxdepth = 6; /* maximum recursion depth */
47			double minweight = 4e-3; /* minimum ray weight */
48
49			COLOR ambval = BLKCOLOR; /* ambient value */
50			double ambacc = 0.2; /* ambient accuracy */
51	greg	1.6	int ambres = 32; /* ambient resolution */
52	greg	1.1	int ambdiv = 128; /* ambient divisions */
53			int ambssamp = 0; /* ambient super-samples */
54			int ambounce = 0; /* ambient bounces */
55			char amblist[128]; / ambient include/exclude list */
56			int ambincl = -1; /* include == 1, exclude == 0 */
57
58	greg	1.13	extern OBJREC Lamb; /* a Lambertian surface */
59
60	greg	1.1	static RAY thisray; /* for our convenience */
61
62	greg	1.10	static int oputo(), oputd(), oputv(), oputl(),
63	greg	1.1	oputp(), oputn(), oputs(), oputw(), oputm();
64
65			static int (ray_out[10])(), (every_out[10])();
66	greg	1.11	static int castonly;
67	greg	1.1
68	greg	1.10	static int puta(), putf(), putd();
69	greg	1.1
70			static int (*putreal)();
71
72
73			quit(code) /* quit program */
74			int code;
75			{
76			exit(code);
77			}
78
79
80			rtrace(fname) /* trace rays from file */
81			char *fname;
82			{
83			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
84			long nextflush = hresolu;
85			FILE *fp;
86	greg	1.2	FVECT orig, direc;
87	greg	1.1	/* set up input */
88			if (fname == NULL)
89			fp = stdin;
90			else if ((fp = fopen(fname, "r")) == NULL) {
91			sprintf(errmsg, "cannot open input file \"%s\"", fname);
92			error(SYSTEM, errmsg);
93			}
94			/* set up output */
95			setoutput(outvals);
96			switch (outform) {
97			case 'a': putreal = puta; break;
98			case 'f': putreal = putf; break;
99			case 'd': putreal = putd; break;
100			}
101			/* process file */
102			while (getvec(orig, inform, fp) == 0 &&
103			getvec(direc, inform, fp) == 0) {
104
105	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
106			fflush(stdout);
107			continue;
108			}
109	greg	1.1	/* compute and print */
110	greg	1.13	if (imm_irrad)
111	greg	1.1	irrad(orig, direc);
112			else
113	greg	1.13	traceray(orig, direc);
114	greg	1.7	/* flush if time */
115	greg	1.1	if (--nextflush == 0) {
116			fflush(stdout);
117			nextflush = hresolu;
118			}
119			if (ferror(stdout))
120			error(SYSTEM, "write error");
121			if (--vcount == 0) /* check for end */
122			break;
123			}
124			if (vcount > 0)
125			error(USER, "read error");
126			fclose(fp);
127			}
128
129
130			setoutput(vs) /* set up output tables */
131			register char *vs;
132			{
133			extern int ourtrace(), (*trace)();
134			register int (**table)() = ray_out;
135
136	greg	1.11	castonly = 1;
137	greg	1.1	while (*vs)
138			switch (*vs++) {
139			case 't': /* trace */
140			*table = NULL;
141			table = every_out;
142			trace = ourtrace;
143	greg	1.11	castonly = 0;
144	greg	1.1	break;
145			case 'o': /* origin */
146			*table++ = oputo;
147			break;
148			case 'd': /* direction */
149			*table++ = oputd;
150			break;
151			case 'v': /* value */
152			*table++ = oputv;
153	greg	1.11	castonly = 0;
154	greg	1.1	break;
155			case 'l': /* length */
156			*table++ = oputl;
157	greg	1.11	castonly = 0;
158	greg	1.1	break;
159			case 'p': /* point */
160			*table++ = oputp;
161			break;
162			case 'n': /* normal */
163			*table++ = oputn;
164			break;
165			case 's': /* surface */
166			*table++ = oputs;
167			break;
168			case 'w': /* weight */
169			*table++ = oputw;
170			break;
171			case 'm': /* modifier */
172			*table++ = oputm;
173			break;
174			}
175			*table = NULL;
176			}
177
178
179	greg	1.13	traceray(org, dir) /* compute and print ray value(s) */
180	greg	1.1	FVECT org, dir;
181			{
182			register int (**tp)();
183
184			VCOPY(thisray.rorg, org);
185			VCOPY(thisray.rdir, dir);
186			rayorigin(&thisray, NULL, PRIMARY, 1.0);
187	greg	1.11	if (castonly)
188			localhit(&thisray, &thescene) \|\| sourcehit(&thisray);
189			else
190			rayvalue(&thisray);
191	greg	1.1
192			if (ray_out[0] == NULL)
193			return;
194			for (tp = ray_out; *tp != NULL; tp++)
195			(**tp)(&thisray);
196			if (outform == 'a')
197			putchar('\n');
198			}
199
200
201	greg	1.13	irrad(org, dir) /* compute immediate irradiance value */
202	greg	1.1	FVECT org, dir;
203			{
204			register int i;
205
206			for (i = 0; i < 3; i++) {
207			thisray.rorg[i] = org[i] + dir[i];
208			thisray.rdir[i] = -dir[i];
209			}
210			rayorigin(&thisray, NULL, PRIMARY, 1.0);
211			/* pretend we hit surface */
212			thisray.rot = 1.0;
213			thisray.rod = 1.0;
214			VCOPY(thisray.ron, dir);
215			for (i = 0; i < 3; i++) /* fudge factor */
216			thisray.rop[i] = org[i] + 1e-4*dir[i];
217			/* compute and print */
218			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
219			oputv(&thisray);
220			if (outform == 'a')
221			putchar('\n');
222			}
223
224
225			getvec(vec, fmt, fp) /* get a vector from fp */
226			register FVECT vec;
227			int fmt;
228			FILE *fp;
229			{
230			static float vf[3];
231
232			switch (fmt) {
233			case 'a': /* ascii */
234			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
235			return(-1);
236			break;
237			case 'f': /* binary float */
238	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
239	greg	1.1	return(-1);
240			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
241			break;
242			case 'd': /* binary double */
243	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
244	greg	1.1	return(-1);
245			break;
246			}
247			return(0);
248			}
249
250
251			static
252			ourtrace(r) /* print ray values */
253			RAY *r;
254			{
255			register int (**tp)();
256
257			if (every_out[0] == NULL)
258			return;
259			tabin(r);
260			for (tp = every_out; *tp != NULL; tp++)
261			(**tp)(r);
262			putchar('\n');
263			}
264
265
266			static
267			tabin(r) /* tab in appropriate amount */
268			RAY *r;
269			{
270			register RAY *rp;
271
272			for (rp = r->parent; rp != NULL; rp = rp->parent)
273			putchar('\t');
274			}
275
276
277			static
278			oputo(r) /* print origin */
279			register RAY *r;
280			{
281			(*putreal)(r->rorg[0]);
282			(*putreal)(r->rorg[1]);
283			(*putreal)(r->rorg[2]);
284			}
285
286
287			static
288			oputd(r) /* print direction */
289			register RAY *r;
290			{
291			(*putreal)(r->rdir[0]);
292			(*putreal)(r->rdir[1]);
293			(*putreal)(r->rdir[2]);
294			}
295
296
297			static
298			oputv(r) /* print value */
299			register RAY *r;
300			{
301			(*putreal)(colval(r->rcol,RED));
302			(*putreal)(colval(r->rcol,GRN));
303			(*putreal)(colval(r->rcol,BLU));
304			}
305
306
307			static
308			oputl(r) /* print length */
309			register RAY *r;
310			{
311	greg	1.9	(*putreal)(r->rt);
312	greg	1.1	}
313
314
315			static
316			oputp(r) /* print point */
317			register RAY *r;
318			{
319			if (r->rot < FHUGE) {
320			(*putreal)(r->rop[0]);
321			(*putreal)(r->rop[1]);
322			(*putreal)(r->rop[2]);
323			} else {
324			(*putreal)(0.0);
325			(*putreal)(0.0);
326			(*putreal)(0.0);
327			}
328			}
329
330
331			static
332			oputn(r) /* print normal */
333			register RAY *r;
334			{
335			if (r->rot < FHUGE) {
336			(*putreal)(r->ron[0]);
337			(*putreal)(r->ron[1]);
338			(*putreal)(r->ron[2]);
339			} else {
340			(*putreal)(0.0);
341			(*putreal)(0.0);
342			(*putreal)(0.0);
343			}
344			}
345
346
347			static
348			oputs(r) /* print name */
349			register RAY *r;
350			{
351			if (r->ro != NULL)
352			fputs(r->ro->oname, stdout);
353			else
354			putchar('*');
355			putchar('\t');
356			}
357
358
359			static
360			oputw(r) /* print weight */
361			register RAY *r;
362			{
363			(*putreal)(r->rweight);
364			}
365
366
367			static
368			oputm(r) /* print modifier */
369			register RAY *r;
370			{
371			if (r->ro != NULL)
372			fputs(objptr(r->ro->omod)->oname, stdout);
373			else
374			putchar('*');
375			putchar('\t');
376			}
377
378
379			static
380			puta(v) /* print ascii value */
381			double v;
382			{
383			printf("%e\t", v);
384			}
385
386
387			static
388			putd(v) /* print binary double */
389			double v;
390			{
391	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
392	greg	1.1	}
393
394
395			static
396			putf(v) /* print binary float */
397			double v;
398			{
399			float f = v;
400
401	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
402	greg	1.1	}