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  "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 */

extern int  oputo(), oputd(), oputv(), oputl(), 
                oputp(), oputn(), oputs(), oputw(), oputm();

static int  (*ray_out[10])(), (*every_out[10])();

extern 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;

        while (*vs)
                switch (*vs++) {
                case 't':                               /* trace */
                        *table = NULL;
                        table = every_out;
                        trace = ourtrace;
                        break;
                case 'o':                               /* origin */
                        *table++ = oputo;
                        break;
                case 'd':                               /* direction */
                        *table++ = oputd;
                        break;
                case 'v':                               /* value */
                        *table++ = oputv;
                        break;
                case 'l':                               /* length */
                        *table++ = oputl;
                        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);
        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:	1.9
Committed:	Tue Mar 27 11:40:10 1990 UTC (34 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+1 -4 lines
Log Message:	Added rt field to RAY structure for more accurate z-buffering
#	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			#include "otypes.h"
30
31			int inform = 'a'; /* input format */
32			int outform = 'a'; /* output format */
33			char outvals = "v"; / output specification */
34
35			int hresolu = 0; /* horizontal (scan) size */
36			int vresolu = 0; /* vertical resolution */
37
38			double dstrsrc = 0.0; /* square source distribution */
39	greg	1.4	double shadthresh = .05; /* shadow threshold */
40	greg	1.5	double shadcert = .5; /* shadow certainty */
41	greg	1.1
42			int maxdepth = 6; /* maximum recursion depth */
43			double minweight = 4e-3; /* minimum ray weight */
44
45			COLOR ambval = BLKCOLOR; /* ambient value */
46			double ambacc = 0.2; /* ambient accuracy */
47	greg	1.6	int ambres = 32; /* ambient resolution */
48	greg	1.1	int ambdiv = 128; /* ambient divisions */
49			int ambssamp = 0; /* ambient super-samples */
50			int ambounce = 0; /* ambient bounces */
51			char amblist[128]; / ambient include/exclude list */
52			int ambincl = -1; /* include == 1, exclude == 0 */
53
54			static RAY thisray; /* for our convenience */
55
56			extern int oputo(), oputd(), oputv(), oputl(),
57			oputp(), oputn(), oputs(), oputw(), oputm();
58
59			static int (ray_out[10])(), (every_out[10])();
60
61			extern int puta(), putf(), putd();
62
63			static int (*putreal)();
64
65
66			quit(code) /* quit program */
67			int code;
68			{
69			exit(code);
70			}
71
72
73			rtrace(fname) /* trace rays from file */
74			char *fname;
75			{
76			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
77			long nextflush = hresolu;
78			FILE *fp;
79	greg	1.2	FVECT orig, direc;
80	greg	1.1	/* set up input */
81			if (fname == NULL)
82			fp = stdin;
83			else if ((fp = fopen(fname, "r")) == NULL) {
84			sprintf(errmsg, "cannot open input file \"%s\"", fname);
85			error(SYSTEM, errmsg);
86			}
87			/* set up output */
88			setoutput(outvals);
89			switch (outform) {
90			case 'a': putreal = puta; break;
91			case 'f': putreal = putf; break;
92			case 'd': putreal = putd; break;
93			}
94			/* process file */
95			while (getvec(orig, inform, fp) == 0 &&
96			getvec(direc, inform, fp) == 0) {
97
98	greg	1.7	if (normalize(direc) == 0.0) { /* zero ==> flush */
99			fflush(stdout);
100			continue;
101			}
102	greg	1.1	/* compute and print */
103			if (outvals[0] == 'i')
104			irrad(orig, direc);
105			else
106			radiance(orig, direc);
107	greg	1.7	/* flush if time */
108	greg	1.1	if (--nextflush == 0) {
109			fflush(stdout);
110			nextflush = hresolu;
111			}
112			if (ferror(stdout))
113			error(SYSTEM, "write error");
114			if (--vcount == 0) /* check for end */
115			break;
116			}
117			if (vcount > 0)
118			error(USER, "read error");
119			fclose(fp);
120			}
121
122
123			setoutput(vs) /* set up output tables */
124			register char *vs;
125			{
126			extern int ourtrace(), (*trace)();
127			register int (**table)() = ray_out;
128
129			while (*vs)
130			switch (*vs++) {
131			case 't': /* trace */
132			*table = NULL;
133			table = every_out;
134			trace = ourtrace;
135			break;
136			case 'o': /* origin */
137			*table++ = oputo;
138			break;
139			case 'd': /* direction */
140			*table++ = oputd;
141			break;
142			case 'v': /* value */
143			*table++ = oputv;
144			break;
145			case 'l': /* length */
146			*table++ = oputl;
147			break;
148			case 'p': /* point */
149			*table++ = oputp;
150			break;
151			case 'n': /* normal */
152			*table++ = oputn;
153			break;
154			case 's': /* surface */
155			*table++ = oputs;
156			break;
157			case 'w': /* weight */
158			*table++ = oputw;
159			break;
160			case 'm': /* modifier */
161			*table++ = oputm;
162			break;
163			}
164			*table = NULL;
165			}
166
167
168			radiance(org, dir) /* compute radiance value */
169			FVECT org, dir;
170			{
171			register int (**tp)();
172
173			VCOPY(thisray.rorg, org);
174			VCOPY(thisray.rdir, dir);
175			rayorigin(&thisray, NULL, PRIMARY, 1.0);
176			rayvalue(&thisray);
177
178			if (ray_out[0] == NULL)
179			return;
180			for (tp = ray_out; *tp != NULL; tp++)
181			(**tp)(&thisray);
182			if (outform == 'a')
183			putchar('\n');
184			}
185
186
187			irrad(org, dir) /* compute irradiance value */
188			FVECT org, dir;
189			{
190			static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
191			static OBJREC Lamb = {
192			OVOID, MAT_PLASTIC, "Lambertian",
193			{0, 5, NULL, Lambfa}, NULL, -1,
194			};
195			register int i;
196
197			for (i = 0; i < 3; i++) {
198			thisray.rorg[i] = org[i] + dir[i];
199			thisray.rdir[i] = -dir[i];
200			}
201			rayorigin(&thisray, NULL, PRIMARY, 1.0);
202			/* pretend we hit surface */
203			thisray.rot = 1.0;
204			thisray.rod = 1.0;
205			VCOPY(thisray.ron, dir);
206			for (i = 0; i < 3; i++) /* fudge factor */
207			thisray.rop[i] = org[i] + 1e-4*dir[i];
208			/* compute and print */
209			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
210			oputv(&thisray);
211			if (outform == 'a')
212			putchar('\n');
213			}
214
215
216			getvec(vec, fmt, fp) /* get a vector from fp */
217			register FVECT vec;
218			int fmt;
219			FILE *fp;
220			{
221			static float vf[3];
222
223			switch (fmt) {
224			case 'a': /* ascii */
225			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
226			return(-1);
227			break;
228			case 'f': /* binary float */
229	greg	1.8	if (fread((char *)vf, sizeof(float), 3, fp) != 3)
230	greg	1.1	return(-1);
231			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
232			break;
233			case 'd': /* binary double */
234	greg	1.8	if (fread((char *)vec, sizeof(double), 3, fp) != 3)
235	greg	1.1	return(-1);
236			break;
237			}
238			return(0);
239			}
240
241
242			static
243			ourtrace(r) /* print ray values */
244			RAY *r;
245			{
246			register int (**tp)();
247
248			if (every_out[0] == NULL)
249			return;
250			tabin(r);
251			for (tp = every_out; *tp != NULL; tp++)
252			(**tp)(r);
253			putchar('\n');
254			}
255
256
257			static
258			tabin(r) /* tab in appropriate amount */
259			RAY *r;
260			{
261			register RAY *rp;
262
263			for (rp = r->parent; rp != NULL; rp = rp->parent)
264			putchar('\t');
265			}
266
267
268			static
269			oputo(r) /* print origin */
270			register RAY *r;
271			{
272			(*putreal)(r->rorg[0]);
273			(*putreal)(r->rorg[1]);
274			(*putreal)(r->rorg[2]);
275			}
276
277
278			static
279			oputd(r) /* print direction */
280			register RAY *r;
281			{
282			(*putreal)(r->rdir[0]);
283			(*putreal)(r->rdir[1]);
284			(*putreal)(r->rdir[2]);
285			}
286
287
288			static
289			oputv(r) /* print value */
290			register RAY *r;
291			{
292			(*putreal)(colval(r->rcol,RED));
293			(*putreal)(colval(r->rcol,GRN));
294			(*putreal)(colval(r->rcol,BLU));
295			}
296
297
298			static
299			oputl(r) /* print length */
300			register RAY *r;
301			{
302	greg	1.9	(*putreal)(r->rt);
303	greg	1.1	}
304
305
306			static
307			oputp(r) /* print point */
308			register RAY *r;
309			{
310			if (r->rot < FHUGE) {
311			(*putreal)(r->rop[0]);
312			(*putreal)(r->rop[1]);
313			(*putreal)(r->rop[2]);
314			} else {
315			(*putreal)(0.0);
316			(*putreal)(0.0);
317			(*putreal)(0.0);
318			}
319			}
320
321
322			static
323			oputn(r) /* print normal */
324			register RAY *r;
325			{
326			if (r->rot < FHUGE) {
327			(*putreal)(r->ron[0]);
328			(*putreal)(r->ron[1]);
329			(*putreal)(r->ron[2]);
330			} else {
331			(*putreal)(0.0);
332			(*putreal)(0.0);
333			(*putreal)(0.0);
334			}
335			}
336
337
338			static
339			oputs(r) /* print name */
340			register RAY *r;
341			{
342			if (r->ro != NULL)
343			fputs(r->ro->oname, stdout);
344			else
345			putchar('*');
346			putchar('\t');
347			}
348
349
350			static
351			oputw(r) /* print weight */
352			register RAY *r;
353			{
354			(*putreal)(r->rweight);
355			}
356
357
358			static
359			oputm(r) /* print modifier */
360			register RAY *r;
361			{
362			if (r->ro != NULL)
363			fputs(objptr(r->ro->omod)->oname, stdout);
364			else
365			putchar('*');
366			putchar('\t');
367			}
368
369
370			static
371			puta(v) /* print ascii value */
372			double v;
373			{
374			printf("%e\t", v);
375			}
376
377
378			static
379			putd(v) /* print binary double */
380			double v;
381			{
382	greg	1.8	fwrite((char *)&v, sizeof(v), 1, stdout);
383	greg	1.1	}
384
385
386			static
387			putf(v) /* print binary float */
388			double v;
389			{
390			float f = v;
391
392	greg	1.8	fwrite((char *)&f, sizeof(f), 1, stdout);
393	greg	1.1	}