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.
 *  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 */

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 = 128;                      /* 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)
                        error(USER, "zero direction vector");
                                                        /* compute and print */
                if (outvals[0] == 'i')
                        irrad(orig, direc);
                else
                        radiance(orig, direc);
                                                        /* flush if requested */
                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(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(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;
{
        if (r->rot < FHUGE)
                (*putreal)(r->rot);
        else
                (*putreal)(0.0);
}


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(&v, sizeof(v), 1, stdout);
}


static
putf(v)                         /* print binary float */
double  v;
{
        float f = v;

        fwrite(&f, sizeof(f), 1, stdout);
}
Revision:	1.2
Committed:	Wed Mar 15 13:47:57 1989 UTC (35 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+1 -1 lines
Log Message:	eliminated unused variable
#	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			* All values default to ascii representation of real
20			* numbers. Binary representations can be selected
21			* with '-ff' for float or '-fd' for double. By default,
22			* radiance is computed. The '-i' option indicates that
23			* irradiance values are desired.
24			*/
25
26			#include "ray.h"
27
28			#include "otypes.h"
29
30			int inform = 'a'; /* input format */
31			int outform = 'a'; /* output format */
32			char outvals = "v"; / output specification */
33
34			int hresolu = 0; /* horizontal (scan) size */
35			int vresolu = 0; /* vertical resolution */
36
37			double dstrsrc = 0.0; /* square source distribution */
38
39			int maxdepth = 6; /* maximum recursion depth */
40			double minweight = 4e-3; /* minimum ray weight */
41
42			COLOR ambval = BLKCOLOR; /* ambient value */
43			double ambacc = 0.2; /* ambient accuracy */
44			int ambres = 128; /* ambient resolution */
45			int ambdiv = 128; /* ambient divisions */
46			int ambssamp = 0; /* ambient super-samples */
47			int ambounce = 0; /* ambient bounces */
48			char amblist[128]; / ambient include/exclude list */
49			int ambincl = -1; /* include == 1, exclude == 0 */
50
51			static RAY thisray; /* for our convenience */
52
53			extern int oputo(), oputd(), oputv(), oputl(),
54			oputp(), oputn(), oputs(), oputw(), oputm();
55
56			static int (ray_out[10])(), (every_out[10])();
57
58			extern int puta(), putf(), putd();
59
60			static int (*putreal)();
61
62
63			quit(code) /* quit program */
64			int code;
65			{
66			exit(code);
67			}
68
69
70			rtrace(fname) /* trace rays from file */
71			char *fname;
72			{
73			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
74			long nextflush = hresolu;
75			FILE *fp;
76	greg	1.2	FVECT orig, direc;
77	greg	1.1	/* set up input */
78			if (fname == NULL)
79			fp = stdin;
80			else if ((fp = fopen(fname, "r")) == NULL) {
81			sprintf(errmsg, "cannot open input file \"%s\"", fname);
82			error(SYSTEM, errmsg);
83			}
84			/* set up output */
85			setoutput(outvals);
86			switch (outform) {
87			case 'a': putreal = puta; break;
88			case 'f': putreal = putf; break;
89			case 'd': putreal = putd; break;
90			}
91			/* process file */
92			while (getvec(orig, inform, fp) == 0 &&
93			getvec(direc, inform, fp) == 0) {
94
95			if (normalize(direc) == 0.0)
96			error(USER, "zero direction vector");
97			/* compute and print */
98			if (outvals[0] == 'i')
99			irrad(orig, direc);
100			else
101			radiance(orig, direc);
102			/* flush if requested */
103			if (--nextflush == 0) {
104			fflush(stdout);
105			nextflush = hresolu;
106			}
107			if (ferror(stdout))
108			error(SYSTEM, "write error");
109			if (--vcount == 0) /* check for end */
110			break;
111			}
112			if (vcount > 0)
113			error(USER, "read error");
114			fclose(fp);
115			}
116
117
118			setoutput(vs) /* set up output tables */
119			register char *vs;
120			{
121			extern int ourtrace(), (*trace)();
122			register int (**table)() = ray_out;
123
124			while (*vs)
125			switch (*vs++) {
126			case 't': /* trace */
127			*table = NULL;
128			table = every_out;
129			trace = ourtrace;
130			break;
131			case 'o': /* origin */
132			*table++ = oputo;
133			break;
134			case 'd': /* direction */
135			*table++ = oputd;
136			break;
137			case 'v': /* value */
138			*table++ = oputv;
139			break;
140			case 'l': /* length */
141			*table++ = oputl;
142			break;
143			case 'p': /* point */
144			*table++ = oputp;
145			break;
146			case 'n': /* normal */
147			*table++ = oputn;
148			break;
149			case 's': /* surface */
150			*table++ = oputs;
151			break;
152			case 'w': /* weight */
153			*table++ = oputw;
154			break;
155			case 'm': /* modifier */
156			*table++ = oputm;
157			break;
158			}
159			*table = NULL;
160			}
161
162
163			radiance(org, dir) /* compute radiance value */
164			FVECT org, dir;
165			{
166			register int (**tp)();
167
168			VCOPY(thisray.rorg, org);
169			VCOPY(thisray.rdir, dir);
170			rayorigin(&thisray, NULL, PRIMARY, 1.0);
171			rayvalue(&thisray);
172
173			if (ray_out[0] == NULL)
174			return;
175			for (tp = ray_out; *tp != NULL; tp++)
176			(**tp)(&thisray);
177			if (outform == 'a')
178			putchar('\n');
179			}
180
181
182			irrad(org, dir) /* compute irradiance value */
183			FVECT org, dir;
184			{
185			static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
186			static OBJREC Lamb = {
187			OVOID, MAT_PLASTIC, "Lambertian",
188			{0, 5, NULL, Lambfa}, NULL, -1,
189			};
190			register int i;
191
192			for (i = 0; i < 3; i++) {
193			thisray.rorg[i] = org[i] + dir[i];
194			thisray.rdir[i] = -dir[i];
195			}
196			rayorigin(&thisray, NULL, PRIMARY, 1.0);
197			/* pretend we hit surface */
198			thisray.rot = 1.0;
199			thisray.rod = 1.0;
200			VCOPY(thisray.ron, dir);
201			for (i = 0; i < 3; i++) /* fudge factor */
202			thisray.rop[i] = org[i] + 1e-4*dir[i];
203			/* compute and print */
204			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
205			oputv(&thisray);
206			if (outform == 'a')
207			putchar('\n');
208			}
209
210
211			getvec(vec, fmt, fp) /* get a vector from fp */
212			register FVECT vec;
213			int fmt;
214			FILE *fp;
215			{
216			static float vf[3];
217
218			switch (fmt) {
219			case 'a': /* ascii */
220			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
221			return(-1);
222			break;
223			case 'f': /* binary float */
224			if (fread(vf, sizeof(float), 3, fp) != 3)
225			return(-1);
226			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
227			break;
228			case 'd': /* binary double */
229			if (fread(vec, sizeof(double), 3, fp) != 3)
230			return(-1);
231			break;
232			}
233			return(0);
234			}
235
236
237			static
238			ourtrace(r) /* print ray values */
239			RAY *r;
240			{
241			register int (**tp)();
242
243			if (every_out[0] == NULL)
244			return;
245			tabin(r);
246			for (tp = every_out; *tp != NULL; tp++)
247			(**tp)(r);
248			putchar('\n');
249			}
250
251
252			static
253			tabin(r) /* tab in appropriate amount */
254			RAY *r;
255			{
256			register RAY *rp;
257
258			for (rp = r->parent; rp != NULL; rp = rp->parent)
259			putchar('\t');
260			}
261
262
263			static
264			oputo(r) /* print origin */
265			register RAY *r;
266			{
267			(*putreal)(r->rorg[0]);
268			(*putreal)(r->rorg[1]);
269			(*putreal)(r->rorg[2]);
270			}
271
272
273			static
274			oputd(r) /* print direction */
275			register RAY *r;
276			{
277			(*putreal)(r->rdir[0]);
278			(*putreal)(r->rdir[1]);
279			(*putreal)(r->rdir[2]);
280			}
281
282
283			static
284			oputv(r) /* print value */
285			register RAY *r;
286			{
287			(*putreal)(colval(r->rcol,RED));
288			(*putreal)(colval(r->rcol,GRN));
289			(*putreal)(colval(r->rcol,BLU));
290			}
291
292
293			static
294			oputl(r) /* print length */
295			register RAY *r;
296			{
297			if (r->rot < FHUGE)
298			(*putreal)(r->rot);
299			else
300			(*putreal)(0.0);
301			}
302
303
304			static
305			oputp(r) /* print point */
306			register RAY *r;
307			{
308			if (r->rot < FHUGE) {
309			(*putreal)(r->rop[0]);
310			(*putreal)(r->rop[1]);
311			(*putreal)(r->rop[2]);
312			} else {
313			(*putreal)(0.0);
314			(*putreal)(0.0);
315			(*putreal)(0.0);
316			}
317			}
318
319
320			static
321			oputn(r) /* print normal */
322			register RAY *r;
323			{
324			if (r->rot < FHUGE) {
325			(*putreal)(r->ron[0]);
326			(*putreal)(r->ron[1]);
327			(*putreal)(r->ron[2]);
328			} else {
329			(*putreal)(0.0);
330			(*putreal)(0.0);
331			(*putreal)(0.0);
332			}
333			}
334
335
336			static
337			oputs(r) /* print name */
338			register RAY *r;
339			{
340			if (r->ro != NULL)
341			fputs(r->ro->oname, stdout);
342			else
343			putchar('*');
344			putchar('\t');
345			}
346
347
348			static
349			oputw(r) /* print weight */
350			register RAY *r;
351			{
352			(*putreal)(r->rweight);
353			}
354
355
356			static
357			oputm(r) /* print modifier */
358			register RAY *r;
359			{
360			if (r->ro != NULL)
361			fputs(objptr(r->ro->omod)->oname, stdout);
362			else
363			putchar('*');
364			putchar('\t');
365			}
366
367
368			static
369			puta(v) /* print ascii value */
370			double v;
371			{
372			printf("%e\t", v);
373			}
374
375
376			static
377			putd(v) /* print binary double */
378			double v;
379			{
380			fwrite(&v, sizeof(v), 1, stdout);
381			}
382
383
384			static
385			putf(v) /* print binary float */
386			double v;
387			{
388			float f = v;
389
390			fwrite(&f, sizeof(f), 1, stdout);
391			}